engine.scope(({ start, cls, spr, btn, btnp, fget }) => { const gravity = 0.3; const maxFall = 4; const jumpPower = -5; const coyoteFrames = 5; const sprites = { player: [ [ -1, -1, 8, 8, 8, 8, -1, -1, -1, -1, 8, 8, 8, 8, 8, 8, -1, -1, 15, 15, 15, 1, -1, -1, -1, -1, 15, 15, 15, 15, 15, -1, -1, 2, 2, 2, 2, 2, -1, -1, -1, 15, 2, 2, 2, 2, 15, -1, -1, -1, 1, 1, 9, 1, -1, -1, -1, 4, 4, -1, -1, 4, 4, -1, ], [false, false, false, false, false, false, false, false], ], ground: [ [ 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 4, 4, 4, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 4, 4, 4, 4, ], [true, false, false, false, false, false, false, false], ], platform: [ [ 6, 6, 6, 6, 6, 6, 6, 6, 13, 13, 13, 13, 13, 13, 13, 13, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, ], [false, true, false, false, false, false, false, false], ], }; const level = []; for (let r = 0; r < 16; r++) level[r] = new Array(16).fill(0); for (let c = 0; c < 16; c++) level[15][c] = 'ground'; for (let c = 3; c <= 6; c++) level[11][c] = 'ground'; for (let c = 9; c <= 12; c++) level[12][c] = 'platform'; let px = 8, py = 104, vx = 0, vy = 0, grounded = false, facing = 1, coyoteTimer = 0, dropTimer = 0; function checkTileCollision(x, y, w, h, velY) { const corners = [ [Math.floor(x / 8), Math.floor(y / 8)], [Math.floor((x + w - 1) / 8), Math.floor(y / 8)], [Math.floor(x / 8), Math.floor((y + h - 1) / 8)], [Math.floor((x + w - 1) / 8), Math.floor((y + h - 1) / 8)], ]; for (const [tx, ty] of corners) { const tile = level[ty]?.[tx]; if (tile && fget(tile, 0)) return true; if (tile && fget(tile, 1) && dropTimer <= 0 && velY > 0) { const tileTop = ty * 8; if (y + h - 1 >= tileTop && y + h - 1 < tileTop + 2) return true; } } return false; } function moveX(dx) { px += dx; if (checkTileCollision(px, py, 8, 8, 0)) { px -= dx; vx = 0; } } function moveY(dy) { const step = dy > 0 ? 1 : -1; for (let i = 0; i < Math.abs(Math.round(dy)); i++) { py += step; if (checkTileCollision(px, py, 8, 8, dy)) { py -= step; if (dy > 0) grounded = true; vy = 0; break; } } } function update() { if (btn('ArrowLeft')) { vx -= 0.3; facing = -1; } if (btn('ArrowRight')) { vx += 0.3; facing = 1; } if (!btn('ArrowLeft') && !btn('ArrowRight')) { vx *= 0.8; if (Math.abs(vx) < 0.1) vx = 0; } vx = Math.max(-1.5, Math.min(1.5, vx)); if (grounded) coyoteTimer = coyoteFrames; else coyoteTimer--; if (dropTimer > 0) dropTimer--; if (btn('ArrowDown') && btnp(' ')) { dropTimer = 8; } else if (btnp(' ') && coyoteTimer > 0) { vy = jumpPower; coyoteTimer = 0; grounded = false; } vy += gravity; if (vy > maxFall) vy = maxFall; moveX(vx); moveY(vy); grounded = checkTileCollision(px, py + 1, 8, 8, 1); } function draw() { cls(12); for (let r = 0; r < 16; r++) { for (let c = 0; c < 16; c++) { if (level[r][c]) spr(level[r][c], c * 8, r * 8); } } spr('player', px, py, 1, 1, facing === -1); } start({ sprites, sounds: {}, update, draw, target }); });

Editing: Platformer: Coyote Time

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