so://phie

blob: 7a5c4a899f4255510fd85ac31c20b28839eafea6 (1301 bytes)[doc][blame][raw]

 1import { Shape } from './game.js';
 2
 3export function collideRect(a, b) {
 4	return a.x < b.x + b.shape.width && a.x + a.shape.width > b.x
 5		&& a.y < b.y + b.shape.height && a.y + a.shape.height > b.y;
 6}
 7
 8export function collideCircle(a, b) {
 9	const dx = Math.abs(a.x - b.x);
10	const dy = Math.abs(a.y - b.y);
11	return Math.sqrt(dx ** 2 + dy ** 2) < a.shape.radius + b.shape.radius;
12}
13
14export function collideRectAndCircle(a, b) {
15	const [rect, circle] = a instanceof Shape.Rect ? [a, b] : [b, a];
16	const dx = Math.abs(circle.x - rect.x);
17	const dy = Math.abs(circle.y - rect.y);
18	if(dx > rect.shape.width / 2 + circle.radius) {
19		return false;
20	}
21	if(dy > rect.shape.height / 2 + circle.radius) {
22		return false;
23	}
24	if(dx < rect.shape.width / 2) {
25		return true;
26	}
27	if(dy < rect.shape.height / 2) {
28		return true;
29	}
30	return (dx - rect.shape.width / 2) ** 2 + (dy - rect.shape.height / 2) ** 2 < circle.radius ** 2;
31}
32
33export function collidePoint(object, point) {
34	if(object.shape instanceof Shape.Rect) {
35		const {x, y, shape: {width, height}} = object;
36		return x < point.x && x + width > point.x && y < point.y && y + height > point.y;
37	}
38	if(object.shape instanceof Shape.Circle) {
39		const {x, y, shape: {radius}} = object;
40		return Math.sqrt((x - point.x) ** 2 + (y - point.y) ** 2) < radius;
41	}
42}