Cabinet 0327 · 8 × 4 grid · phosphor Mk II

BRICK
BREAKER

Thirty-two cyan bricks, one yellow ball, three lives and a paddle the width of a promise. Clear the grid — 320 points is the ceiling.

INSERT COINfree play · rev 1.0

400×600 canvas AABB sweep collision 60 FPS fixed step 0 dependencies

400 × 600 · NTSC ready

Operator's Manual

Collision doctrine · edge-case register

Wall / ceilingLeft, right, top boundary

flip dy or dx · reposition flush

Paddle face60px white plate, y = 580

exit angle = contact offset × 56° · dy forced negative

Paddle flankSide face of the plate

flip dx · ball ejected outside plate

Brick, horizontal entryBall's X pass overlaps AABB

flip dx · brick dies · +10

Brick, vertical entryBall's Y pass overlaps AABB

flip dy · brick dies · +10

The floorBelow y = 600

lose a ball · streak reset · respawn on paddle

Launch vector normalised, not straight up — starts on a 45°-ish diagonal
One collision per axis pass, so a ball cannot re-hit the same brick twice
Magnitude re-normalised after every bounce: speed is constant, never a runaway
Minimum vertical component of 0.28 × speed — no eternal horizontal stalls
Overlapping brick clusters resolve in X first, then Y — the near face always wins
Paddle follow is damped, so fast flicks never teleport the plate off-screen
Pointer coordinates mapped through getBoundingClientRect at any CSS scale
Fixed 16.67ms accumulator — identical physics at 60, 90 and 120 Hz