engine.scope(({ start, cls, spr, mset, mget, map, fget, circfill, line, btn, caption }) => { const sprites = { grass: [ [ 3, 3, 11, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 11, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 11, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 11, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 11, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 11, ], [false, false, false, false, false, false, false, false], ], road: [ [ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, ], [true, false, false, false, false, false, false, false], ], finish: [ [ 7, 0, 7, 0, 7, 0, 7, 0, 0, 7, 0, 7, 0, 7, 0, 7, 7, 0, 7, 0, 7, 0, 7, 0, 0, 7, 0, 7, 0, 7, 0, 7, 7, 0, 7, 0, 7, 0, 7, 0, 0, 7, 0, 7, 0, 7, 0, 7, 7, 0, 7, 0, 7, 0, 7, 0, 0, 7, 0, 7, 0, 7, 0, 7, ], [true, true, false, false, false, false, false, false], ], }; const turnSpeed = 0.05; let x = 60, y = 24; let angle = 0; let speed = 0; let onRoad = true; function buildTrack() { for (let r = 0; r < 16; r++) { for (let c = 0; c < 16; c++) { mset(c, r, 'grass'); } } for (let c = 2; c <= 13; c++) { mset(c, 2, 'road'); mset(c, 3, 'road'); } for (let c = 2; c <= 13; c++) { mset(c, 12, 'road'); mset(c, 13, 'road'); } for (let r = 2; r <= 13; r++) { mset(2, r, 'road'); mset(3, r, 'road'); } for (let r = 2; r <= 13; r++) { mset(12, r, 'road'); mset(13, r, 'road'); } mset(7, 2, 'finish'); mset(7, 3, 'finish'); } function isOnRoad(px, py) { const tile = mget(Math.floor(px / 8), Math.floor(py / 8)); return tile && fget(tile, 0); } function init() { buildTrack(); } function update() { onRoad = isOnRoad(x, y); const accel = onRoad ? 0.08 : 0.04; const friction = onRoad ? 0.97 : 0.92; const max = onRoad ? 1.5 : 0.6; if (btn('ArrowLeft')) angle -= turnSpeed; if (btn('ArrowRight')) angle += turnSpeed; if (btn('ArrowUp')) speed += accel; if (btn('ArrowDown')) speed -= accel; speed *= friction; if (speed > max) speed = max; if (speed < -max / 2) speed = -max / 2; if (Math.abs(speed) < 0.01) speed = 0; x += Math.cos(angle) * speed; y += Math.sin(angle) * speed; if (x < 4) x = 4; if (x > 124) x = 124; if (y < 4) y = 4; if (y > 124) y = 124; } function draw() { cls(0); map(); circfill(x, y, 3, 8); line(x, y, x + Math.cos(angle) * 5, y + Math.sin(angle) * 5, 10); caption(onRoad ? 'road' : 'grass', 2, 2, 7); } start({ sprites, sounds: {}, init, update, draw, target }); });

Editing: Racing: Off-track Slowdown

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