engine.scope(({ start, cls, rectfill, pset, line, btn, circfill, caption, base }) => { const { Map, WallTexture, Darken, Constants, fogAmount, applyFog } = base(); const sprites = { wall: WallTexture }; const lamps = [ { x: 8, y: 2.5, radius: 4 }, { x: 2.5, y: 8, radius: 4 }, { x: 13.5, y: 8, radius: 4 }, { x: 8, y: 13.5, radius: 4 }, ]; let px = Constants.SpawnX; let py = Constants.SpawnY; let pa = 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; } } function lampLight(hitX, hitY) { let light = 0; for (const lamp of lamps) { const dx = hitX - lamp.x; const dy = hitY - lamp.y; const dist = Math.sqrt(dx * dx + dy * dy); if (dist < lamp.radius) { light += 1 - dist / lamp.radius; } } return Math.min(1, light); } function draw() { cls(0); const halfH = 64; for (let sy = 0; sy < 128; sy++) { const distFromHorizon = Math.abs(sy - halfH); const floorFog = 1 - distFromHorizon / halfH; const baseColor = sy < halfH ? 1 : 5; for (let sx = 0; sx < 128; sx++) { const columnOffset = Math.abs(sx - 64) / 64; const torchReduction = Constants.TorchStrength * (1 - columnOffset * columnOffset); const effectiveFog = Math.max(0, floorFog - torchReduction / Constants.MaxDist); pset(sx, sy, applyFog(baseColor, effectiveFog, sx, sy)); } } const dirX = Math.cos(pa); const dirY = Math.sin(pa); const planeX = -dirY * Constants.Fov; const planeY = dirX * Constants.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 hitX = px + rdx * perpDist; const hitY = py + rdy * perpDist; const columnOffset = Math.abs(x - 64) / 64; const torchReduction = Constants.TorchStrength * (1 - columnOffset * columnOffset); const light = lampLight(hitX, hitY); const effectiveDist = Math.max(0, perpDist - torchReduction - light * Constants.MaxDist); const fogFactor = fogAmount(effectiveDist); 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 wallHitFrac; if (side === 0) { wallHitFrac = py + perpDist * rdy; } else { wallHitFrac = px + perpDist * rdx; } wallHitFrac -= Math.floor(wallHitFrac); const tx = Math.floor(wallHitFrac * 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 (side === 0) { color = Darken[color]; } color = applyFog(color, fogFactor, x, sy); pset(x, sy, color); } } for (let y = 0; y < Constants.MapSize; y++) { for (let x = 0; x < Constants.MapSize; 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 lamp of lamps) { circfill( Constants.MmX + Math.floor(lamp.x * Constants.Cell), Constants.MmY + Math.floor(lamp.y * Constants.Cell), 1, 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('lamps light nearby walls', 2, 2, 7); } start({ sprites, sounds: {}, update, draw, target }); });

Editando: Fog & Lighting: Street Lamps

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