Aquarium breach · grok-4.7

I will build an interactive 2D aquarium-breach simulation on a canvas. The simulation will include an intact tank, a draggable crack, gravity-driven water outflow, and physics for glass fragments and nearby objects.

The crack will be draggable vertically below the waterline. Breaching breaks the panel around the opening and releases a gravity-curved jet. The waterline falls continuously, and outflow weakens as the level drops until it stops.

Escaped water will pool on the floor and against the walls. Rocks sink, toys float, plants drift, and fish swim against the current before some are swept through the breach. Objects that fit the opening can be carried out by the flow. Once they leave the water, they fall under gravity and collide with the floor. I am choosing a canvas size and will verify the simulation in the browser.

The canvas will be 1200 by 720 pixels. The room floor will sit at y=680, with walls at x=40 and x=1160. The tank will occupy x=180 to x=620 and y=140 to y=520, with the initial waterline near y=180. The crack marker will sit on the right glass panel, draggable vertically below the waterline.

The breach will be a vertical slot roughly 60 to 80 pixels tall centered on the crack marker. Outflow velocity will follow Torricelli's law based on water depth above the opening, with flow rate scaled by a discharge coefficient and opening area. As the waterline drops, the effective outflow area shrinks until the opening is fully exposed.

The floor will hold a height field of escaped water that spreads between the room walls. Rocks will be sized so only small pebbles can fit the opening and be swept away; larger rocks will stay on the tank bottom. The floating toy will drift with the current and exit if it fits the breach.

Plants will be rooted but bend with the current. Fish will swim against the flow before some are swept through the breach. Glass fragments will spawn on the broken panel, rotate, collide with other objects, and sink to the floor under water drag.

Each object will carry position, velocity, mass, buoyancy, and a flag for whether it is in water. Gravity will pull downward. Buoyancy will push upward for floating objects. Drag will resist motion more strongly in water than in air.

A horizontal current field will pull objects toward the breach, stronger near the opening and when water depth is high. Fish will swim left-right with wander, then fight the current by swimming leftward with limited force.

Fish will be swept through the breach if the current overcomes their swim speed or they approach too closely. Only objects smaller than the opening height can pass through it. The right glass panel shatters into fragments that fly outward with rotation, collide with the floor and each other, and drag in water. Escaped water volume will be tracked to drive the floor puddle.

The floor puddle will be modeled as a 1D height field that diffuses from the impact point and is constrained by the room walls. Water from the jet will add volume at the point of contact.

The visual style will be dark and moody with glass reflections, gradient water surfaces, and surface waves. Fish will be drawn as canvas paths, plants as bezier curves, rocks as polygons, and the toy as a rubber duck or boat.

I will use a seeded random generator so the reset returns the simulation to an identical initial state. The room will have 24-pixel margins, a floor at y=height minus 50, and walls at x=30 and width minus 30. The tank will measure 380 by 340 pixels.

The tank will sit at x=160, y=120 with an 8-pixel glass thickness. The initial waterline is 36 pixels below the top edge at y=156. The crack marker will be a jagged line on the right panel, draggable vertically from just below the waterline down to near the bottom with a margin so the 70-pixel opening stays fully submerged.

The crack center will be constrained so the opening stays fully submerged: its top edge must remain below the initial waterline, and its bottom edge must stay above the tank floor. Breaching removes the glass panel in that vertical band and spawns fragments there. Gravity is set to 900 pixels per second squared, and the water surface level will be tracked as a y-coordinate.

The outflow velocity will be sqrt(2 * g * depth) multiplied by a 0.65 discharge coefficient. Volume lost per frame equals this velocity times the submerged opening height and thickness factor, divided by the tank width to lower the waterline. Jet particles will spawn randomly within the submerged opening, accelerate downward under gravity, and die on impact with the floor to add to the puddle.

The floor puddle will be a 1D height field across columns from wall to wall. When a jet particle hits the floor, volume is added to nearby columns and spreads each frame by flowing from high to low while staying inside the walls. The pool will render as a filled polygon.

Fish will be ellipses with tails, swimming at 40–80 pixels per second. They fight the current by moving leftward when it exceeds a threshold, but if the current grows stronger than 130 percent of their speed near the breach they lose control and are swept away. Some fish will be weaker than others.

Rocks will have a density of 2.5 and sit on the tank floor; only a small pebble can pass through the breach. The floating toy is a rubber duck with density 0.3 that drifts toward the opening and exits if it fits, then falls under gravity outside. Plants are rooted at the bottom with springy segments that bend with the current and let their tips drift. Glass fragments will be roughly twelve angular polygons with rotation, bouncing off the floor and colliding with each other.

Drag will apply to objects inside the tank or in the puddle. The current field will pull toward the breach opening, with strength scaling by horizontal position and distance from the crack center, falling off exponentially within 180 pixels.

The current field will pull objects toward the breach opening with a slight downward component. Fish will accelerate upstream against the flow, but their swim force will drop when they get too close to the hole and the current is strong.

A UI panel will sit above the canvas with a title, instructions, a breach button, a reset button, and live status showing water level and flow rate.

Visual polish includes a dark teal room background, subtle floor tiles, a tank stand, and simplified sine-wave caustics.

Bubbles and glass highlights will add visual polish. The crack handle will be a draggable circle or line within twenty pixels, dragged vertically and clamped to valid bounds. Reset will restore the initial scene including the crack position, removing all fragments, puddle volume, and outflow state.

The UI will sit in a fixed HTML overlay behind the fullscreen canvas. This keeps the Breach and Reset buttons reliably clickable.

A fixed timestep will keep the simulation stable. Each glass fragment will be approximated as a circle for collision detection while its visual shape remains a polygon. When a fragment hits the floor, it bounces with 30 percent vertical damping, 80 percent horizontal damping, and its spin slows. Wall collisions use the same damping. Overlapping fragments will separate and exchange velocity along their contact normal, transferring some angular momentum. Objects that leave the tank but remain above the puddle will fall under full gravity with no buoyancy.

Objects that fall into the floor puddle will experience slight buoyancy and drag. Fish and the toy that pass through the breach will flop outside with gravity-only motion and a small random horizontal velocity. Plants will bend strongly under current, and one loose plant may break free to drift.

The jet will render as a polyline ribbon with particles so its downward curve is obvious in screenshots. A debug readout of water level and jet particle count will be added to the HTML for easy inspection. The color palette is set: dark room tones from #0c1218 to #1a2832, floor #2a2420, and water rgba(40, 140, 180).

The water will use a deep blue gradient from rgba(40, 140, 180, 0.55) at the top to deeper blue at the bottom. The glass frame will be a faint white stroke. Fish will be orange, yellow, blue, and pink; plants green; the toy yellow; rocks gray-brown.

The canvas will draw in layers: room background, floor, puddle, tank interior, rocks and plants, clipped water fill, jet particles, objects inside the tank, the glass frame, fragments, the crack handle, and finally any objects that have fallen outside.

A bright surface line will mark the moving waterline. Jet particles will follow a parabolic arc as gravity pulls them downward from their horizontal exit velocity. The outflow will taper off automatically as the water head drops: the spawn rate and particle speed decrease with lower depth, and the breach stops once the water level reaches the opening bottom.

Plants will be modeled as springy segments that bend upward with a rest angle, then tilt with the current. Fish will have wagging tails driven by sine waves over time. The duck toy will be drawn as a circle body with a head and beak. Bubbles will rise through the water, and some will be pulled toward the breach opening. The animation loop will use requestAnimationFrame.

The crack will sit on the right glass wall as a jagged line with a circular handle, dragged vertically with an ns-resize cursor. The initial water level will be set from y=168 to y=452, leaving a large volume above the crack. The tank bounds are fixed at x=140, y=110, width 420, height 400, with a 10-pixel glass thickness.

Canvas height is fixed at 800 pixels. The tank bottom sits at y=510 and the stand extends to y=620, leaving room for the floor puddle at y=730. The jet will fall from the opening to the floor, giving roughly 0.75 seconds of drop time with a vertical velocity near 648 pixels per second. A head of 150 pixels would make the horizontal exit speed too high and flatten the curve, so the initial water head must be reduced to keep the parabola visible.

To keep the jet curve visible in early screenshots, exit velocity will be capped so particles do not fly too far before gravity acts. A continuous stream will let older particles fall and form a visible arc. The jet body may also be drawn as a theoretical parabola.

Exit velocity is fixed at roughly 250 pixels per second with a 1600 pixel gravity constant. A particle will fall about 128 pixels in 0.4 seconds, so the jet curve will be visible in early screenshots. The outflow rate is set to a 2D discharge coefficient of 0.15, yielding a waterline drop of about 6.5 pixels per second.

The initial drain rate is too slow for a quick test. I will decouple the visual particle speed from the volume drain rate so both look good. The waterline will drop about 40 pixels per second initially, and I will tune the constants after testing.

Fish will orient upstream and swim against the current as soon as the breach starts. Plants will bend immediately, and the toy will slide toward the hole. Velocity vectors are omitted to keep the scene visually clean. The entire simulation will live in a single inline script, with an init() function preserving the exact initial state for Reset. I will also prevent text selection during drag and handle canvas resizing.

The UI will sit in a top header bar so it does not block the tank or the jet path. Pointer coordinates will be calculated relative to the canvas. Keyboard controls are unnecessary.

The canvas will be fixed at 1200 by 800 pixels to avoid scrollbars and viewport shifts. Pointer coordinates will be mapped from the browser using getBoundingClientRect so clicks align with the tank interior.

The Breach and Reset buttons will sit at fixed coordinates near the top-right corner of the 1200×800 viewport. The glass panel will be drawn as two segments split by the crack, with jagged edges at the break. I will write the file now and iterate.

Fragments will burst from the crack edges with outward velocity and spin. A 120-column Float32Array will model the floor puddle height, with water volume added at impact positions and spread across neighboring columns each frame.

Puddle height will be computed by converting particle volume into depth. Water will spread across neighboring columns via a simple diffusion step, with no flow at the outer walls so water piles up against them. The floor surface will render as a blue polygon with a wavy top. Impact from the jet and particles hitting the right wall will add water at the base of those walls.

Fish will patrol the tank before the breach. Once the current flows right, they will fight upstream and drift slowly left, with one small fish near the outlet getting pulled quickly toward the hole while another stays on the left. The toy will float at the surface and drift right with the weaker surface current.

If the crack is low, the surface current stays mild and the toy will drift slowly rather than being pulled out immediately. It will float at the waterline and move downward with the falling level, drifting toward the side. If it reaches the hole while water is still flowing, it can be sucked through. Small pebbles on the bottom will be pushed slightly right by the current; a small enough rock may even pass through a low crack.

The default crack will sit low enough that a small pebble can pass through, though a larger rock cannot. Plants will lean toward the breach opening. A sand substrate will be added beneath the rocks. The crack handle will be constrained to stay below the initial water surface.

The crack handle will be clamped between the initial water surface and the tank bottom, with a four-pixel margin on each side. It stays visible before the breach and hides once the glass breaks. A highlighted break zone will preview the opening size while dragging. The jet will use a particle system capped at four hundred particles, spawned from a flow-dependent rate. Rather than drawing individual particles, the main stream will follow an analytical parabolic curve.

The jet curve will be generated by stepping a representative exit point through time, adding gravity and horizontal velocity each frame until the particle hits the floor or right wall. The resulting path will be drawn as a thick semi-transparent stroke with alpha, layered over the particle stream so the breach arc is visible immediately in the first frame.

The jet will use multiple streamlines from the top, middle, and bottom of the submerged opening. Each will exit at a speed proportional to local water head, so the lower hole sprays faster than the upper one. The intact tank will also show a gentle wave animation on its surface. A small stand and room window will be added for atmosphere, with no external images.

A live status div will display phase, water level, flow rate, fish velocity, plant lean, toy position, puddle volume, and fragment count. This lets me verify the breach response immediately without browser console access.

Fish will be drawn as ellipses rotated to their velocity angle, with a wagging tail driven by sine waves and a small eye.

Fish will be drawn as ellipses with a wagging tail and a small eye. Their orientation will follow their swim direction rather than their velocity vector so they face upstream while fighting the current. A duck drawing function is also being added.

The duck is drawn as a yellow ellipse with an orange beak and black eye. Rocks will be rendered as irregular polygons rotated at random angles. Plants are being drawn as colored strokes with a three-pixel line width.

Plant segments will be updated each frame by blending the current velocity into a target lean angle, then restoring the original vertical orientation over time. The glass fragment physics update is being drafted next.

Glass fragments will be polygons with local vertices, velocity, angular velocity, and a water flag. Fourteen fragments spawn at the crack edge with random sizes, speeds, and spins. Some start with negative horizontal velocity so they fall inside the tank. Collisions against the left and bottom glass are handled by a simplified circle-versus-AABB check.

The tank interior will be clipped to the waterline so the deeper gradient and caustics stay inside the liquid. A "drag" label will sit near the crack handle. The simulation should fit in roughly seven hundred to nine hundred lines.

A water meniscus will connect the jet to the opening. Objects inside the tank are drawn after the water fill with a slight tint so they remain visible. The full draw order is: background room, floor, puddle, back glass, sand, plants and rocks, water fill, fish and toy, front glass, crack, jet, fragments, objects outside, then HTML UI.

Rocks will be drawn at 0.45 opacity so they remain visible beneath the water. The toy will bob at the surface using a critically damped spring that pulls it toward the waterline and applies upward buoyancy proportional to its submersion depth.

Rocks will sink slowly because their high density is only partially offset by weak buoyancy, and they collide with the tank floor where friction stops them. Water drag on rocks is weaker relative to their mass than on the toy or fish, so they barely respond to the current. Fish will fight upstream against the breach flow; their desired leftward velocity depends on their stamina, which drops when the current is strong and they are near the hole.

Fish will fight upstream by adding a swim-velocity target and current drag as separate forces. Their desired leftward speed is multiplied by remaining stamina, which drops when the current is strong and they are near the hole. Some fish start with low stamina so they are swept away early, confirming the initial upstream struggle before escape.

All fish will fight hard at first so the early sample shows upstream orientation; one weak fish will be pulled away. The surface current will displace the toy by about forty pixels in the first second. A `currentAt` helper is being drafted to compute velocity only inside the tank water, using a local top boundary that rises with the falling waterline.

The `currentAt` function now computes flow velocity inside the tank. It pulls water toward the breach opening using a distance-weighted speed that falls off with depth and horizontal position, plus a bulk flow scaled by local water depth. Vertical velocity is reduced to eighty percent of the horizontal pull.

A `canExit` check will let objects pass through the breach only if they fit entirely within the opening height and clearance margins. Objects that cannot exit collide with the right glass wall instead.

Objects that cannot exit the breach will slide along the right glass edge and stop at the tank boundary. Collisions with the left wall, bottom glass, and room floor are also being handled. Objects that fall into the puddle will have their vertical velocity damped. Glass fragments will collide with each other and the floor, and they will experience drag while inside the water region.

Glass fragments will be flagged as submerged only when they sit inside the tank water or within the puddle zone. While submerged, their velocity decays exponentially with a drag coefficient of 2.5 per second and angular velocity decays at 1.5; buoyancy reduces effective gravity to 30 percent. Outside the liquid, gravity pulls them normally. Fragments rotate continuously by adding angular velocity each frame. The crack handle is being wired up as a draggable pointer element.

The crack handle is drawn slightly outside the right glass edge as a jagged red-and-white line with a visible grip. It is draggable only while the tank is intact, and its vertical position is clamped between the top and bottom of the opening. A "CRACK" label will sit beside it. The Breach button will be disabled when the crack is already open.

Reset will return the crack handle to its default vertical position. The canvas will use `touch-action: none` to prevent browser scrolling during drag. The visual style is a dark aquarium lab with amber buttons, monospace readouts, and a custom font stack using Iowan Old Style, Palatino, Georgia, and system-ui. Water jet particles will spawn inside the analytical curve so they appear in screenshots alongside the breach geometry.

The jet will reach the floor within roughly 0.6 seconds so the early sample captures its downward curve and the waterline drop. The puddle will form once the water arrives.

A seven-step verification plan is set: load the page, drag the crack, trigger a breach, sample motion and readouts, reset, and confirm the tank returns to its initial state. The HTML buttons will be placed at fixed viewport coordinates so the click tool can target them reliably.

The control panel will be fixed at the top-left corner. HTML buttons are preferred over canvas-drawn controls for reliability, and aria labels will be added. Exact coordinates for the Breach button and crack handle are being determined so the verification tool can target them precisely.

The tank geometry is fixed at 1200 by 800 pixels. The crack handle will sit at (544, 320) with a half-size of 36. Its vertical drag range is clamped between 192 and 464.

The control panel will sit at the top-right corner so it does not overlap the tank. A status element will display live simulation notes. The initial waterline height will be stored and compared during reset to confirm the tank returns to its original state. The intact scene will include dark blue-gray walls, a wooden floor, a tank on a stand, gravel, three plants, three rocks plus one pebble, four fish, and one duck toy.

Bubbles and light rays will animate above the intact tank. A glass reflection rectangle will sit at the top edge. The simulation state object will replace snapshot logic, since init() resets everything. Fragments will collide with the tank exterior and each other, and some will land in the puddle. Particle rendering will use additive alpha circles for a softer look. The jet water will be lighter than the tank water.

A hover indicator will highlight the crack opening. The status readout will include a version hash for debugging. Frame time will be capped at one-thirtieth of a second to prevent physics spikes. Window resizing will recompute room walls and floor while keeping the tank geometry fixed so it does not jump. Puddle columns will span the full width of the tank.

The tank stand will sit on the floor, and the puddle will spread across the floor in front of it. Water will flow under the stand and onto the floor plane, constrained only by the room walls.

Splash particles will burst when the jet strikes the floor. The crack handle will be placed on the right side of the tank so the breach jet remains visible in the open room space. The crack cannot be dragged above the initial waterline; its vertical position is fixed before the breach occurs.

The crack will appear as a vertical jagged line about seventy pixels tall, and the user will drag the entire fissure up and down along the glass. Glass stress lines will be added to the visual design. The plan is now complete.

The mouse cursor will change to a grab icon when hovering the crack handle. Reset will abort an active breach animation and restore the tank immediately. The water-level step function is being refined to compute the exact flow area and centroid of the water column above the crack opening.

The flow model uses a drag coefficient of 0.62 and a scale factor to compute the two-dimensional outflow rate from the water column above the crack. The initial waterline drop is fast enough to be visible immediately, though it slows as the head decreases.

The flow scale is reduced to 0.45 so the tank drains over about fifteen seconds and fish can struggle. The jet speed is set to 140 plus 0.22 times the water head, giving a downward drop of roughly 440 pixels in 0.77 seconds and a horizontal travel of about 225 pixels for a parabolic curve. Particle spawn rate is tuned to roughly eighty to one hundred fifty per second.

The jet will be drawn as a solid polygon with a semi-transparent stroke and lighter core, using three streamlines at the top, middle, and bottom of the opening to create a curved downward flow. Reset will clear all particles, fragments, puddle, and breach state. A `makeWorld` helper is being defined to initialize the simulation state.

The simulation state object will store crack position, fish, rocks, plants, the toy, fragments, particles, a puddle array, and time. Plants will be represented as angles and computed positions. Four loose leaves will drift with the current near the plants. Rocks will avoid overlapping during the simulation, and fish will use soft separation to prevent stacking.

Shadow blur will be limited to the crack glow and water surface to avoid particle slowdown. A `layout()` function will scale the room walls and floor to the canvas size while keeping the tank geometry fixed at 1200 by 800 pixels so coordinates stay stable. Strict mode and null checks will guard against console errors.

The tank is now fixed at 120 by 88 with a width of 430 and height of 430. Its bottom edge sits at 560 and the floor plane is at 740, giving the stand a height of 180 pixels. The water surface is set to 168, the crack handle is centered at (545, 330), and the jet will drop roughly 400 pixels before hitting the floor.

The tank geometry is being recalculated to ensure the jet arc has enough vertical distance. The floor plane is fixed at 752 pixels, and the tank top is raised to 118 with a height of 400 pixels. The cabinet stand now spans from 518 to 752 pixels, creating a tall shelf-like structure. Water will pool on the floor in front of the cabinet, and the jet will arc onto the floor to the right of the stand.

The jet will arc to the right of the cabinet and land on the floor near x=750. A shorter cabinet is being considered to prevent the curved jet from colliding with the stand.

The cabinet will reach the floor plane. The jet exits horizontally from the tank right edge, so it leaves the cabinet silhouette immediately and does not need collision handling with the stand.

The cabinet will span the full tank width from its left edge to its right edge, extending from the tank bottom down to the floor plane. The puddle will be drawn with transparency across the cabinet base so it appears as water on the floor in front of the stand. Ripples will animate on the puddle surface. Glass fragments will collide using circle physics and rotate based on their tangential velocity when they strike surfaces.

Fragment collisions will use a coefficient of -1.4, with random angular velocity added to each piece on impact. When fragments hit the floor, they bounce vertically at 28% of speed while losing 72% of horizontal speed and 20% of rotation.

Fragments inside the tank will collide with the interior walls and bottom rather than the room floor. A few pieces will break inward and fall through the water onto the gravel, slowed by drag to demonstrate fluid resistance.

The crack handle will use pointer and mouse event listeners to ensure reliable dragging across different input methods. A small status div will display live simulation numbers each frame, and a `window.__debug` object is being considered for developer inspection.

The crack widget will be enlarged so the entire right glass panel below the waterline can be grabbed. It will feature a white core, cyan glow, red stress lines, a triangular handle, and "DRAG" text. During dragging, a horizontal guide line and a red translucent preview of the future opening will appear on the glass. Keyboard accessibility is not required. The code will be written as a single self-contained index.html file.

Plant stems will lean visibly in the current. Their angle is computed from local velocity, clamped to ±0.9 radians, and applied relative to vertical.

Plant stems will lean visibly in the current. Their angle is computed from local velocity, clamped to ±0.9 radians, and applied relative to vertical.

Fish positions are fixed at (240, 250), (360, 300), (300, 380), and (420, 220) with orange, blue, yellow, and pink colors. The toy floats at x=250. Fish will swim left against the rightward current. Their tails will beat faster when facing upstream. Plants will bend visibly and the toy will drift right to make the current response obvious.

A subtitle will be added to the page. The final color palette is set: a dark background, blue water tones, and semi-transparent glass strokes. After triggering the breach, the simulation will pause for about one second before the screenshot so that plant leaning and toy drift are clearly visible. Reset must restore the crack position if it was dragged before the breach.

Accent colors are finalized: red for the breach button and green for reset. Sand will be #c4a574. Bubbles will be added to visualize the current pulling toward the breach. An "on-canvas" instruction near the crack will prompt the user to drag it. The water surface will animate with a ±3 pixel sine wave, but volume calculations will use the mean waterY as the reference level. The jet will draw from that mean waterY, and outflow will stop exactly when the waterline reaches the bottom of the crack opening.

The status display will show whether the tank is sealed or drained to the crack opening, and it will track the flow rate. As water drains, the jet will visually thin and shorten. A second breach side was considered but rejected. A small head indicator will be added. The code is ready to be written, using an FPS-independent animation loop. A 160-column Float32Array will handle the puddle spread algorithm.

The puddle spread algorithm distributes incoming volume to neighboring columns and limits flux to 45 percent of each cell's height to prevent negative water levels.

Each particle will carry a volume equal to the flow rate divided by the spawn rate, so the total escaped volume matches the analytical jet. When particles hit the floor or slide down the right wall, their volume is added to the puddle array. The analytical jet will be drawn immediately, while the puddle fills in as particles arrive.

Particles sliding down the right wall will bounce off the floor and splash, adding volume to the puddle. The puddle will be drawn as a filled polygon with a wave on top. Room walls will contain any excess water. The tank's total water volume is large enough that escaped water cannot overflow back into the tank.

The expected puddle depth is roughly 50 to 70 pixels, which is clearly visible. The floor will not be tinted separately because the puddle itself provides enough visual evidence of wetness. Drips on the cabinet were considered but skipped for simplicity.

Fish, toy, and pebble will collide with the floor once they leave the tank. Rocks will rest on the inner bottom glass at a height of innerB minus 16 pixels plus their radius. The sand surface sits 22 pixels above that inner bottom.

The tank is fixed at x=130, y=124 with a 12-pixel glass thickness. The inner right edge sits at x=558, so the crack handle will be centered at x=564. The opening width is 78 pixels, which accommodates fish and large rocks that can sink and be carried out.

Rocks will sink and rest on the inner bottom glass. They are heavy enough that the current cannot easily carry them out, so they will slide to the right wall instead of passing through the hole. A small pebble aligned with a low crack could exit, but large rocks fitting the opening may still be dragged out.

The crack opening is fixed at 64 pixels. Large rocks have a diameter of 68 pixels and cannot fit through the hole. Medium rocks are 48 pixels across and can exit only if the opening sits low enough for the current to lift them. Pebbles and the floating toy both fit through the opening.

Fish will use a collision radius of 9 pixels and a visual length of 28 pixels. The canvas will be drawn in CSS pixels via setTransform to avoid off-by-one coordinate errors from device pixel ratios. A title treatment will be added to the panel. The simulation will be written and tested next, with any issues fixed afterward.

An etched "FILL" marker will be drawn on the left glass to mark the initial waterline, making the drop-off obvious. Console logging will be avoided to keep the console clean.

Glass fragments will spawn half inside the tank and half outside. Inside fragments will face high drag to sink slowly, while outside fragments fall faster. This makes rotation, collision, and water resistance all clearly visible in the one-second verification screenshot.

Glass fragments will be drawn as semi-transparent cyan polygons with pale white edges, rotated to match their angular velocity. They will also receive a brief horizontal push as they fall through the jet before gravity takes over.

The physics loop will use a fixed 1/60-second step with an accumulator, running multiple steps per frame when needed. A frame counter will be added to the status display. Reset will also clear any lingering drag state.

A subtle 4-pixel screen shake will last 0.3 seconds when the breach fires. Water jet particles will be drawn as ellipses stretched along their velocity vector. A floor baseboard will be added. The crack handle will highlight only on the right side. Once breached, the right glass will show jagged edges at the top and bottom of the opening while the top, left, and bottom glass remain intact.

The water jet will be clipped to the jagged crack opening so it leaks only through the breach. The code is expected to run about 1000 lines. Fish will have a brief pre-breach animation to make the initial scene feel alive. Reset must return fish to their original patrol positions rather than their current mid-swim locations.

Fish idle offsets will be zero at time zero so reset returns them to their original positions. The crack handle will sit at y=340. Status text will expose live simulation state—phase, water level, crack position, flow rate, plant lean, toy position, fish velocity, and puddle depth—to aid visual inspection.

A data attribute on the body element will expose the simulation phase for easy inspection. Plants will rest upright before the breach because the current is zero, and they will lean once water flows. All four rocks will be physics-enabled so none float; static gravel was considered but rejected.

Plants will remain rooted and only bend under strong current, with one loose frond drifting away. The floating toy will not sink into the rocks because it stays near the surface while the rocks rest at the bottom. The CSS panel is fixed at the top right, 280 pixels wide, with a dark background and no overflow.

The reset button will use a teal background, and the breach button will dim when disabled. A monospace status display will sit below the controls. A left-side depth gauge will be drawn on the canvas itself. The panel will instruct users to drag the glowing crack handle below the waterline before pressing Breach. To avoid transparency bleeding between layers, globalAlpha will be saved and restored around each draw call.

Canvas resize will be limited to the initial load and window resize events. The crack handle will use a 48-by-90-pixel hit area for dragging.

Default page margins will be zeroed. The top-right panel will not overlap the crack handle at (564, 340). Wheel events will be ignored to prevent accidental scrolling during drag. The crack position will appear in the status text so users can confirm the drag. The water jet will be drawn as a thick bright ribbon against a dark background rather than a debug parabola. A faint grid may be added for depth reference.

The room will include a dark baseboard, a picture frame, and a ceiling light. A simple round window or pipe will be drawn on the back wall to keep the scene minimal. Sand specks will be added for texture. The waterline will fall continuously during the drain rather than in discrete steps.

The inner bottom glass serves as the water volume floor, while sand sits beneath it. As the waterline drops toward the crack, more sand becomes visible above the breach. The tank draws in this order: back panel, sand, plants, rocks, water rectangle, fish, toy, leaves, bubbles, then front glass edges.

Fish will be drawn normally rather than clipped under a second water tint, and the floating toy will sit half above the surface line. A wavy path function will define the water surface for both visual rendering and physics clipping, with a mean waterY value used for volume calculations. A specular highlight will be added to the water surface.

Fish will start with zero horizontal velocity. After the breach, they accelerate left against the current for 0.3 seconds, then lose stamina and get swept right out toward the hole. This produces the early leftward drift needed for the verification sample. A comment header will be added to the file.

Weak fish will be placed mid-tank so they fight the current early and are swept out within four to six seconds. Their stamina depletes faster as they near the breach, with proximity scaling the drain rate.

Fish will use a target-velocity model instead of separate drag forces. Their horizontal speed will be driven toward the sum of their swim force and the current velocity, scaled by their remaining stamina. This naturally produces leftward drift early on, then lets them follow the current and get swept out near the breach. Vertical motion will track the current plus a small wander term.

Rocks and toys will use a force model instead of the fish target-velocity approach. Rocks have low buoyancy (0.35) so they sink through drag. The toy has high buoyancy (1.6) so it rises to the surface, then floats partially above water once it escapes the tank.

The toy will be pulled upward toward the water surface by a spring force with exponential damping. It drifts right with the current and exits the tank only when it reaches the crack while the waterline is still above it.

The toy will remain on the surface until the waterline drops inside the crack opening and its x position reaches the hole, creating a dramatic exit moment. Leaves will drift with the current and can also escape. Pebbles resting on the sand will slide toward the breach under strong current drag, then slow to a stop from exponential friction.

Pebbles will slide roughly fifty pixels toward the breach in one second, making their movement visible in the early sample. Shadows will be drawn beneath objects for depth. The body element will have user-select disabled to prevent text selection during drag. The breach button will be enabled while the tank is intact and disabled after a breach.

The reset button will remain enabled at all times. A context menu on the canvas will be suppressed, and keyboard shortcuts B and R will be added for convenience. The jet ribbon will be drawn by tracing multiple streamlines from the breach head, using a simple Euler integration with gravity to produce short, slow curves.

The jet ribbon will use a semi-transparent cyan stroke with a brighter core line. Particles will spawn along the leading edge for texture, and droplets will fall off the main jet. The curve begins immediately on the first frame to satisfy the early sample requirement. The waterline will drop right away after the breach.

A dashed ghost line will mark the initial waterline so the drop is visible even in a ten-pixel screenshot. The drain rate will be tuned to roughly twenty-five to forty pixels per second so the fall is obvious within one second. Separate gravity constants will govern the jet ribbon and the exit head calculation.

The jet ribbon and particles will share the same gravity constant and initial speed so they follow identical trajectories. The outflow volume formula will absorb any remaining discrepancy through a discharge coefficient, keeping the physics internally consistent.

A subtle white flash will radiate crack lines across the glass for 0.15 seconds when the breach fires. Twelve fragments will spawn along the opening height with staggered vertical positions and outward velocities so they do not overlap at first, then explode apart.

Inside fragments will fall into the water with drag, while outside fragments fly outward, rotate, and collide with the floor. Wall collisions will also be added for fragments. The room walls and floor are included in the collision bounds.

Fragments will be clamped to the ceiling so they cannot pass through it. Objects that exit the tank arc downward under gravity and collide with the floor. A weak fish placed near the breach will exit within about three seconds, satisfying the verification requirement.

The weak fish will start at x=480, just 78 pixels from the crack. It will fight the current for about 0.8 seconds before being swept out, matching the spec's narrative of initial resistance followed by overwhelm. All fish begin with full stamina, and the weak one drains its energy in roughly 1.5 seconds.

Fish will face left while fighting the current and turn with their velocity once they escape. The drawFish function will rotate based on this facing angle plus a small pitch from vertical motion. The file is ready to be written.

A general `collideTank` function will handle all tank collisions. Fish will rest above the sand layer and avoid it with a wander term, but vertical motion into the sand triggers collision. The left wall is clamped at innerL plus radius. Once an object passes the breach hole and aligns with it, it becomes escaped and switches to room-only collision. Glass thickness is set at the inner radius.

The toy may initially hit the right glass above the crack and bob. As the waterline drops, the surface can enter the opening and pull the toy out. The default crack height should allow this dramatic exit within a reasonable time.

The default crack sits at y=250, so the waterline must drop about 54 pixels before the surface reaches the opening top. At a 30 pixel per second drain rate this takes roughly 1.8 seconds. The toy drifts right at 40 pixels per second, so it will hit the glass wall above the hole first and wait. Once the water falls into the opening zone, the existing downward current near the breach will pull the toy down and out.

The toy will slide down the right glass wall into the opening. Collision there will freeze horizontal velocity but allow downward motion, so it can drop through the hole and escape.

The surface current will include a bulk drift term that scales with the breach head height and weakens as the tank drains. This keeps the toy visibly drifting rightward toward the outlet even when the waterline is still high.

Leaves will float with slight buoyancy. The `clamp` helper is required. Image smoothing will be enabled. The crack handle will be a grabbable circle at the glass center, with the line extending above and below.

The crack handle will be constrained to a vertical range that keeps the entire opening below the initial waterline. The default position is 320 pixels, with a minimum of 204 and a maximum of 448. A central `GEO` object will store all tank dimensions so the inner walls and glass thickness stay synchronized.

The inner tank bounds are now fixed at y=132 to 504, with the initial waterline at 168 and the sand layer at 482. The crack handle will sit at x=561, and its default height is 318 pixels. A light cone will shine from above the tank, and depth ticks will be drawn on the left margin.

The status element will update every ten frames to reduce layout thrash. A meta viewport tag and a dynamic document title will be included. Fish colors are set to coral, yellow, blue, and pink; plants to green shades; rocks to browns and pebbles. Eyes and fins will be added for charm, and a duck toy may appear.

The duck is the floating toy. Fish reflections will be skipped to save time.

The code will be organized into eight sections: HTML and CSS, constants and state, init and reset, input, physics step, draw, loop, and buttons.

Puddle columns will be rebuilt each frame from the current wall positions so the grid stays accurate if the tank resizes. Splash particles will be separate short-lived particles with no volume contribution.

Jet particles will be named `jets`. They will stop spawning once the breach ends, but existing ones will finish their arc into the puddle. Dragging the crack handle will cancel any active drag. Faint animated current streaks will be drawn inside the tank to make the outflow direction obvious in still screenshots.

The `drawCurrentStreaks` function will render 18 faint blue arrows inside the tank to visualize the outflow direction. It checks that no division by zero can produce NaN when the breach head or submergence height is zero.

The initial scene looks good. The crack is visible.

The gauge labels overlap when the water is full. I will fix that. I will drag the crack handle down to y=400 and then breach it.

The jet curves downward nicely.

Waterline is dropping. Fish swims against the current. Fragments scatter. Jet hits the floor. The glass breakage is hard to see because the stroke matches the intact panel.

The glass opening needs a clear gap and darker room showing through. The plant lean is 27 degrees, but the plants still look fairly upright in the screenshot.

The plant geometry should produce a 71-pixel horizontal offset, so the bend ought to be obvious. The screenshot likely captured the frame before the updated angles were drawn. The rightmost plant might show a faint lean.

The plant lean is computed before the status update, so the image should reflect it. The vertical plants likely mean the follow animation is too slow to have applied the angle change yet.

The plant lean value is the target current-driven angle, not the actual bent angle. The follow animation reaches only about 62 percent of that target in half a second, so the plants should already be visibly tilted.

The screenshot was likely captured too early after the breach. The waterline drop is only four pixels, and the etched line overlaps the NOW label, so the fall is not yet obvious. I will wait for more motion before rescreening. The jet has reached the floor and escaped volume is accumulating, but the puddle height still needs a second to form.

Glass fragments cluster at the opening and rotate, some caught inside the jet. The orange fish in the image points right even though it should face left against the current.

The orange fish may actually be facing left in the image. The blue fish appears to face right. A bug was spotted: when face is -1, the code rotates by Math.PI.

The eye sits at positive x, so a PI rotation should place it on the left. The orange fish still appears to face right, which means its face value is likely +1 rather than -1. This suggests the screenshot was captured before the first step after the breach updated the face state. A later frame will be checked to confirm.

The glass stroke is 14 pixels wide and centered on the opening, so it should already create a gap. The surrounding `strokeRect` call may be drawing a continuous border that hides the hole.

The surrounding strokeRect draws a continuous right-side border, which hides the glass hole. The tank interior and water also cover the opening. I will clip those layers or draw the opening as a cutout so the room behind is visible.

The surface current is too weak to move the toy, so it will be strengthened. The plant lean target is correct but needs faster and stronger visual follow-up. Rocks have not shifted.

The pebble should slide but the early frame may be too soon to show it. I will sample motion and capture a later screenshot to track evolution.

Gauge labels must not overlap. Fragments need to scatter more and fall to the floor with visible rotation.

The waterline drops about 33 pixels per second, so the fall should be obvious. The DOM and image overlay show slightly different values, likely from a timing mismatch. I will capture motion to verify dynamics before applying fixes.

The puddle is too tall. It looks like a mountain of water instead of a flat pool constrained by the floor and walls.

The volume calculation is wrong. The escaped volume is 117000, which matches most of the tank volume. That should yield a puddle height of only about 100 pixels, yet the visual peak is roughly 400 pixels tall.

The spread algorithm is failing. Volume is clumping into a sharp peak rather than spreading across the floor. The height estimate from the raw volume suggests an impossible 6000-pixel column, so the actual volume may be over-counted.

The volume math is correct. The peak persists because viscosity is too low for the inflow rate, so the fluid spreads too slowly and stays high. I need to increase the spreading rate dramatically to flatten the puddle against the walls.

The per-step transfer is only 0.04 times the height difference. The 48 percent cap is not the bottleneck. The real problem is that inflow is continuous at a single point while outflow is spread across the entire floor, so the fluid never levels out.

The jet has been dumping volume in one spot for several seconds. Diffusion is too slow and local to flatten the mound.

I will try a faster hydrostatic approach. Each frame I can move a large fraction of excess height to neighbors, or run multiple relaxation passes. Another option is to compute total volume and render a flat water surface that rises between the walls, with only a slight impact mound that flattens quickly.

I will use roughly twelve relaxation passes per frame with a higher diffusion constant. A global leveling term will flatten the peak so the puddle looks like a pool constrained by the floor and walls.

Twelve passes of 0.45 mixing per frame should flatten the peak quickly while still showing outward spread. A wet-front model is also being considered: water spreads left and right from the impact point, fills shallow columns, then deepens once it hits the walls.

The height-field approach is being replaced by a simple edge-based model. Two frontiers will expand outward from the impact point at 180 pixels per second, distributing volume uniformly between them. The surface will render as a shallow wave that deepens once the edges hit the walls.

A new issue has appeared: the toy seems to have escaped the tank and is now floating at x=746.

The toy is escaping with excessive upward velocity. It exits the tank near the ceiling and falls through the tall puddle peak. The float code sets its position to floorY minus puddle height, which traps it on the oversized water mound instead of letting it drop.

Fixing the puddle will also free the duck, which is currently floating on the oversized water peak.

Two fish were swept out. One pink fish remains on the floor. The orange and yellow fish are still in the tank near the surface because the waterline fell to the opening. The blue fish may have been swept away as well.

The rocks stayed in the tank and sank properly. The plants are upright because the current stopped; they had no head or lean. During active flow they should have bent, but the motion sample was taken too late after most of the water had already drained.

Plants need to bend faster and more dramatically so the lean is visible in the first second. The glass opening still looks too subtle; it needs a clearer broken-panel notch. The rapid drainage was acceptable, and the two fish were swept out correctly. Outflow weakens as the water head drops, which is expected.

The water level is now almost at the bottom of the opening. Flow will stop shortly.

Fragments landed on the floor and inside the tank near the opening. They rotated and settled correctly. The ones in water look fine, though they should fall slower if they are inside the tank.

The jet curves downward clearly in the early screenshot.

The FILL and NOW labels overlap the fish when water is low. They should move outside or hide when unnecessary.

The glass hole still looks mostly intact. I will draw a clear rectangular gap with jagged edges and clip water so it only exits through that hole.

Once the puddle is fixed, the toy and any fish outside will fall to the floor under gravity.

Plants should bend more dramatically during outflow.

Plants will store a visible bend that decays slowly so the lean stays obvious. The current effect on plant angles will be increased.

The pebble may still be in the gravel rather than outside the tank, which is fine if the opening was not at the bottom.

I checked for volume overcounting. Only addPuddle from the jets adds volume, and escapedVol is tracked separately. The tall mountain is caused by the height field itself.

The puddle currently obscures the jet landing. It will be flattened into a shallow pool on the floor.

The drain speed is too fast to read the struggle clearly. I will slow it slightly to about 20–30 pixels per second so the breach phase is visible without making the waterline freeze.

The drain speed is acceptable at about 90 pixels per second and will stay unchanged. The duck’s upward launch will be fixed by capping its vertical velocity when it exits the tank so it arcs downward instead of flying into the air. The orange fish remains in the tank facing left, and the pink fish on the floor has settled correctly. The glass opening will be cut cleanly with broken shards along the rim, and the tank interior will be masked at the breach so the room beyond is visible.

The jagged glass hole will be drawn by removing the full right stroke once the breach begins. Plants will follow current almost instantly with a lean multiplier of 0.8 radians per 100 pixels per second, and they will be drawn after the water so their bend remains visible.

The shallow pool will sit in front of the cabinet base. The full tank volume would be about 100 pixels deep, but since water only drains through the opening, the actual pool height will be lower.

The 100-pixel puddle is physically correct but visually too large. A 30–40 pixel spread should look like a shallow constrained pool.

A depth scale of three will flatten the pool visually while keeping wall constraints. The jet will be forced to stop completely once the water level reaches the opening bottom.

A small epsilon will be added so the jet vanishes cleanly once the water level reaches the opening bottom. The puddle will be modeled with a running volume and expanding left and right edges that start at the first water impact point.

The drain speed will start at 220 pixels per second and rise with volume, capped at 400. The pool depth is now scaled by 2.6 so the water stays shallow.

The reset function will clear the puddle volume and spread edges. The jet ribbon will gain a translucent fill between its outer streamlines for a fuller look, though this is optional and time-boxed. The glass opening will be redrawn as a jagged break with a dark highlight instead of the full right stroke.

Plants will bend faster. FILL and NOW labels will sit on the left outside, and NOW will hide when near FILL. The toy’s upward velocity will be capped so it arcs downward instead of flying. The pebble’s drag coupling will be increased so it can exit through a low opening.

Objects will collide with the floor at floorY rather than the puddle surface. The shallow pool will be drawn behind them so they rest visually on the water.

The glass opening will be left as a void by removing the front stroke, letting the jet start at the inner rim. The 14-pixel thickness gap already shows the hole. Water filling the breach is physically correct.

Plant lean gain will be raised to 0.008 times velocity for a dramatic bend, and a visible sway will be added. The glass breach will use thicker jagged edges with no full right-side stroke. I am now editing and retesting the reset and early breach.

The duck is stuck on a phantom puddle and will need a reload after the fix. The status label will show actual pool height instead of escaped volume. Fish on the floor confirm gravity works correctly.

The minimum pool span is raised to 40 pixels and the spread rate to 300 pixels per second so the jet curve stays visible during early outflow. The first particles will not spike the height.

The first 0.2 seconds of outflow will produce only about a seven-pixel pool, so the jet curve stays visible. Wall constraints will keep the spread bounded until both edges hit the walls, then height will rise freely. A meniscus and wet floor sheen will be added for realism. The reset function already restores the crack to its original position.

Updating drawPuddle to use the new spread model. Fixing the gauge and possibly the toy floating.

I'll cap the toy float so it doesn't fly, and make the jet a filled ribbon.

Considering an optional improvement to fill the jet between outer streamlines.

The jet curves downward clearly.

The waterline is dropping. Plants are visibly bending toward the breach. Fragments burst and rotate. Fish remain inside, with a pink one near the hole. The glass opening is visible through fragment gaps. Next I will animate puddle spread, fish sweep, weakening outflow, and reset.