engine.scope(({ start, cls, rectfill, pset, line, btn, text, caption }) => { const map = [ [1, 1, 1, 1, 1, 1, 1, 1], [1, 0, 0, 0, 0, 0, 0, 1], [1, 0, 1, 0, 0, 1, 0, 1], [1, 0, 0, 0, 0, 0, 0, 1], [1, 0, 0, 0, 0, 0, 0, 1], [1, 0, 1, 0, 0, 1, 0, 1], [1, 0, 0, 0, 0, 0, 0, 1], [1, 1, 1, 1, 1, 1, 1, 1], ]; const sprites = { wall: [ 4, 4, 4, 5, 4, 4, 4, 4, 4, 4, 4, 5, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 5, 4, 4, 4, 4, 4, 4, 4, 5, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 5, 4, 4, 4, 4, 4, 4, 4, 5, 4, 4, 4, 4, ], }; const darken = [ 0, 0, 0, 0, 2, 0, 5, 6, 2, 4, 9, 3, 1, 1, 2, 9, ]; let px = 1.5; let py = 1.5; let pa = 0; const fov = 0.66; const moveSpeed = 0.05; const rotSpeed = 0.05; const cell = 4; const viewX = 32; const viewW = 96; const viewH = 128; function update() { if (btn('ArrowLeft')) pa -= rotSpeed; if (btn('ArrowRight')) pa += rotSpeed; if (btn('ArrowUp')) { const nx = px + Math.cos(pa) * moveSpeed; const ny = py + Math.sin(pa) * moveSpeed; if (map[Math.floor(py)][Math.floor(nx)] === 0) px = nx; if (map[Math.floor(ny)][Math.floor(px)] === 0) py = ny; } if (btn('ArrowDown')) { const nx = px - Math.cos(pa) * moveSpeed; const ny = py - Math.sin(pa) * moveSpeed; if (map[Math.floor(py)][Math.floor(nx)] === 0) px = nx; if (map[Math.floor(ny)][Math.floor(px)] === 0) py = ny; } } function draw() { cls(0); for (let y = 0; y < 8; y++) { for (let x = 0; x < 8; x++) { const color = map[y][x] === 1 ? 5 : 6; rectfill( x * cell, y * cell, (x + 1) * cell, (y + 1) * cell, color, ); } } rectfill(viewX, 0, viewX + viewW, viewH / 2, 1); rectfill(viewX, viewH / 2, viewX + viewW, viewH, 5); const dirX = Math.cos(pa); const dirY = Math.sin(pa); const planeX = -dirY * fov; const planeY = dirX * fov; for (let x = 0; x < viewW; x++) { const cameraX = (2 * x) / viewW - 1; const rdx = dirX + planeX * cameraX; const rdy = dirY + planeY * cameraX; let mapX = Math.floor(px); let mapY = Math.floor(py); const deltaDistX = Math.abs(rdx) < 1e-10 ? 1e30 : Math.abs(1 / rdx); const deltaDistY = Math.abs(rdy) < 1e-10 ? 1e30 : Math.abs(1 / rdy); let stepX, stepY, sideDistX, sideDistY; if (rdx < 0) { stepX = -1; sideDistX = (px - mapX) * deltaDistX; } else { stepX = 1; sideDistX = (mapX + 1 - px) * deltaDistX; } if (rdy < 0) { stepY = -1; sideDistY = (py - mapY) * deltaDistY; } else { stepY = 1; sideDistY = (mapY + 1 - py) * deltaDistY; } let side; while (true) { if (sideDistX < sideDistY) { sideDistX += deltaDistX; mapX += stepX; side = 0; } else { sideDistY += deltaDistY; mapY += stepY; side = 1; } if (map[mapY]?.[mapX] === 1) break; } const perpDist = side === 0 ? sideDistX - deltaDistX : sideDistY - deltaDistY; const stripeH = Math.floor(viewH / perpDist); const drawStart = Math.max( 0, Math.floor(viewH / 2 - stripeH / 2), ); const drawEnd = Math.min( viewH, Math.floor(viewH / 2 + stripeH / 2), ); let wallHit; if (side === 0) { wallHit = py + perpDist * rdy; } else { wallHit = px + perpDist * rdx; } wallHit -= Math.floor(wallHit); const tx = Math.floor(wallHit * 8); const texStep = 8 / stripeH; let texPos = (drawStart - viewH / 2 + stripeH / 2) * texStep; for (let sy = drawStart; sy < drawEnd; sy++) { const ty = Math.min(7, Math.floor(texPos)); texPos += texStep; let color = sprites.wall[ty * 8 + tx]; if (color < 0) continue; if (perpDist >= 4) { color = darken[darken[color]]; } else if (perpDist >= 2) { color = darken[color]; } if (side === 0) { color = darken[color]; } pset(viewX + x, sy, color); } const hitX = px + rdx * perpDist; const hitY = py + rdy * perpDist; line( Math.floor(px * cell), Math.floor(py * cell), Math.floor(hitX * cell), Math.floor(hitY * cell), 10, ); } rectfill( Math.floor(px * cell) - 1, Math.floor(py * cell) - 1, Math.floor(px * cell) + 2, Math.floor(py * cell) + 2, 8, ); line( Math.floor(px * cell), Math.floor(py * cell), Math.floor(px * cell + Math.cos(pa) * 4), Math.floor(py * cell + Math.sin(pa) * 4), 8, ); caption('arrows to move', 34, 2, 7); } start({ sprites, sounds: {}, update, draw, target }); });

Editing: Raycasting: Complete Example

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