bobs.js

// prettier-ignore
// ball sprite as 2x2 tiles
const ball = [
	0x00, 0x00, 0x03, 0x33,
	0x00, 0x03, 0x32, 0x22,
	0x00, 0x32, 0x22, 0x22,
	0x03, 0x22, 0x11, 0x22,
	0x03, 0x21, 0x11, 0x12,
	0x32, 0x21, 0x11, 0x12,
	0x32, 0x22, 0x11, 0x22,
	0x32, 0x22, 0x22, 0x22,

	0x44, 0x50, 0x00, 0x00,
	0x22, 0x33, 0x50, 0x00,
	0x12, 0x23, 0x35, 0x00,
	0x22, 0x23, 0x34, 0x50,
	0x22, 0x22, 0x33, 0x50,
	0x22, 0x22, 0x33, 0x45,
	0x22, 0x22, 0x33, 0x45,
	0x22, 0x23, 0x33, 0x45,

	0x42, 0x22, 0x22, 0x22,
	0x42, 0x22, 0x22, 0x22,
	0x43, 0x22, 0x22, 0x22,
	0x04, 0x33, 0x22, 0x23,
	0x05, 0x33, 0x33, 0x33,
	0x00, 0x54, 0x33, 0x33,
	0x00, 0x05, 0x54, 0x44,
	0x00, 0x00, 0x05, 0x55,

	0x22, 0x23, 0x33, 0x45,
	0x22, 0x33, 0x34, 0x45,
	0x23, 0x33, 0x34, 0x45,
	0x33, 0x33, 0x44, 0x50,
	0x33, 0x34, 0x44, 0x50,
	0x34, 0x44, 0x45, 0x00,
	0x44, 0x45, 0x50, 0x00,
	0x55, 0x50, 0x00, 0x00,
]

function BOOT() {
	memset(SPRITE_BASE + 20 * 32, ball);
	memset32(PALETTE + 4, [0xfe2ffe, 0x9900cc, 0x590098, 0x2c0068, 0x010230]);
}

function TICK() {
	cls();
	let t = peek32(FRAME) * 0.01;
	for (let i = 1; i < 100; i++) {
		let tt = t + i * 0.05;
		let x = (140 * sin(3 * tt + 0.8) + W2 - 8) | 0;
		let y = (70 * sin(4 * tt) + H2 - 8) | 0;
		tiles([20, 21], x, y, 0);
		tiles([22, 23], x, y + 8, 0);
	}
}