engine.scope(({ start, cls, rectfill, pset, line, btn, caption }) => { const map = [ [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1], [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1], [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1], [1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1], [1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1], [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1], [1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1], [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1], [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1], [1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1], [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1], [1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1], [1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1], [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1], [1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1], [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1], ]; const mapSize = 16; const sprites = { wall: [ 6, 6, 6, 5, 6, 6, 6, 6, 6, 6, 6, 5, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 5, 6, 6, 6, 6, 6, 6, 6, 5, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 5, 6, 6, 6, 6, 6, 6, 6, 5, 6, 6, 6, 6, ], }; const darken = [ 0, 0, 0, 0, 2, 0, 5, 6, 2, 4, 9, 3, 1, 1, 2, 9, ]; let px = 2.5; let py = 2.5; let pa = 0; const fov = 0.66; const moveSpeed = 0.05; const rotSpeed = 0.05; const cell = 2; const mapW = mapSize * cell; const mmX = 128 - mapW; const mmY = 128 - mapW; 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); rectfill(0, 0, 128, 64, 1); rectfill(0, 64, 128, 128, 5); const dirX = Math.cos(pa); const dirY = Math.sin(pa); const planeX = -dirY * fov; const planeY = dirX * fov; for (let x = 0; x < 128; x++) { const cameraX = (2 * x) / 128 - 1; const rdx = dirX + planeX * cameraX; const rdy = dirY + planeY * cameraX; let mx = Math.floor(px); let my = 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 - mx) * deltaDistX; } else { stepX = 1; sideDistX = (mx + 1 - px) * deltaDistX; } if (rdy < 0) { stepY = -1; sideDistY = (py - my) * deltaDistY; } else { stepY = 1; sideDistY = (my + 1 - py) * deltaDistY; } let side; while (true) { if (sideDistX < sideDistY) { sideDistX += deltaDistX; mx += stepX; side = 0; } else { sideDistY += deltaDistY; my += stepY; side = 1; } if (map[my]?.[mx] === 1) break; } const perpDist = side === 0 ? sideDistX - deltaDistX : sideDistY - deltaDistY; const stripeH = Math.floor(128 / perpDist); const drawStart = Math.max(0, Math.floor(64 - stripeH / 2)); const drawEnd = Math.min(128, Math.floor(64 + 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 - 64 + 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 >= 8) { color = darken[darken[color]]; } else if (perpDist >= 4) { color = darken[color]; } if (side === 0) { color = darken[color]; } pset(x, sy, color); } } for (let y = 0; y < mapSize; y++) { for (let x = 0; x < mapSize; x++) { const color = map[y][x] === 1 ? 5 : 6; rectfill( mmX + x * cell, mmY + y * cell, mmX + (x + 1) * cell, mmY + (y + 1) * cell, color, ); } } rectfill( mmX + Math.floor(px * cell) - 1, mmY + Math.floor(py * cell) - 1, mmX + Math.floor(px * cell) + 2, mmY + Math.floor(py * cell) + 2, 8, ); line( mmX + Math.floor(px * cell), mmY + Math.floor(py * cell), mmX + Math.floor(px * cell + Math.cos(pa) * 4), mmY + Math.floor(py * cell + Math.sin(pa) * 4), 8, ); caption('arrows to move', 34, 2, 7); } start({ sprites, sounds: {}, update, draw, target }); });

Editando: Fog & Lighting: Base Raycaster

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