engine.scope(({ start, cls, rectfill, pset, line, btn, base, caption }) => { const { Map, WallTexture, Darken, Constants } = base(); const sprites = { wall: WallTexture }; let px = Constants.SpawnX; let py = Constants.SpawnY; let pa = 0; let bobPhase = 0; let bobOffset = 0; function update() { if (btn('ArrowLeft')) pa -= Constants.RotSpeed; if (btn('ArrowRight')) pa += Constants.RotSpeed; if (btn('ArrowUp')) { const nx = px + Math.cos(pa) * Constants.MoveSpeed; const ny = py + Math.sin(pa) * Constants.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) * Constants.MoveSpeed; const ny = py - Math.sin(pa) * Constants.MoveSpeed; if (Map[Math.floor(py)][Math.floor(nx)] === 0) px = nx; if (Map[Math.floor(ny)][Math.floor(px)] === 0) py = ny; } const moving = btn('ArrowUp') || btn('ArrowDown'); if (moving) { bobPhase += Constants.BobSpeed; } else { bobPhase *= 0.9; } bobOffset = Math.sin(bobPhase) * Constants.BobAmount; } function draw() { cls(0); const horizonY = Math.floor(64 + bobOffset); rectfill(0, 0, 128, horizonY, 1); rectfill(0, horizonY, 128, 128, 5); const dirX = Math.cos(pa); const dirY = Math.sin(pa); const planeX = -dirY * Constants.Fov; const planeY = dirX * Constants.Fov; const hits = []; for (let x = 0; x < 128; x++) { const cameraX = (2 * x) / 128 - 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(128 / perpDist); const center = 64 + bobOffset; const drawStart = Math.max( 0, Math.floor(center - stripeH / 2), ); const drawEnd = Math.min( 128, Math.floor(center + 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 - center + 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(x, sy, color); } hits.push({ x: px + rdx * perpDist, y: py + rdy * perpDist, }); } for (let y = 0; y < 8; y++) { for (let x = 0; x < 8; x++) { const color = Map[y][x] === 1 ? 5 : 6; rectfill( Constants.MmX + x * Constants.Cell, Constants.MmY + y * Constants.Cell, Constants.MmX + (x + 1) * Constants.Cell, Constants.MmY + (y + 1) * Constants.Cell, color, ); } } for (const h of hits) { line( Constants.MmX + Math.floor(px * Constants.Cell), Constants.MmY + Math.floor(py * Constants.Cell), Constants.MmX + Math.floor(h.x * Constants.Cell), Constants.MmY + Math.floor(h.y * Constants.Cell), 10, ); } rectfill( Constants.MmX + Math.floor(px * Constants.Cell) - 1, Constants.MmY + Math.floor(py * Constants.Cell) - 1, Constants.MmX + Math.floor(px * Constants.Cell) + 2, Constants.MmY + Math.floor(py * Constants.Cell) + 2, 8, ); line( Constants.MmX + Math.floor(px * Constants.Cell), Constants.MmY + Math.floor(py * Constants.Cell), Constants.MmX + Math.floor(px * Constants.Cell + Math.cos(pa) * 4), Constants.MmY + Math.floor(py * Constants.Cell + Math.sin(pa) * 4), 8, ); caption('walk to see the bob', 2, 2, 7); } start({ sprites, sounds: {}, update, draw, target }); });

Editando: Screen Shake & View Bobbing: View Bobbing

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