BCC/Physics1.bcc at master · BeneDevRepo/BCC · GitHub

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int width = 400;
int height = 400;
float r = 5.;

list<list<float>> updatePoints(list<list<float>> points) {
	int i = 0;

	while(i < list_size(points)) {
		list<float> point = list_get(points, i);
		float x = list_get(point, 0);
		float y = list_get(point, 1);
		float vx = list_get(point, 2);
		float vy = list_get(point, 3);

		vy = vy + .01;

		x = x + vx;
		y = y + vy;

		if(x < r) {
			x = r;
			vx = -vx;
		}
		if(y < r) {
			y = r;
			vy = -vy;
		}
		if(x > cast<float>(width) - r) {
			x = cast<float>(width) - r;
			vx = -vx;
		}
		if(y > cast<float>(height) - r) {
			y = cast<float>(height) - r;
			vy = -vy;
		}

		point = list_set(point, 0, x);
		point = list_set(point, 1, y);
		point = list_set(point, 2, vx);
		point = list_set(point, 3, vy);

		points = list_set(points, i, point);

		i = i + 1;
	}

	return points;
}

list<list<float>> points = [
	[100., 100., .5, .9],
	[300., 200., -.4, .6],
	[200., 300., .8, -.5]
];

window_size(width, height);

while(true) {
	window_pollMsg();

	if(window_shouldClose())
		break;

	window_clear(200, 200, 200);

	set_color(255, 0, 0);
	window_point(window_mouseX(), window_mouseY(), 10);

	points = updatePoints(points);

	int i = 0;
	while(i < list_size(points)) {
		list<float> point = list_get(points, i);
		float x = list_get(point, 0);
		float y = list_get(point, 1);

		set_color(0, 0, 0);
		window_point(cast<int>(x), cast<int>(y), cast<int>(r));

		i = i + 1;
	}

	window_flip();
}