so://phie

blob: 653b071ffd81992c1243bf456d0521afcdd63c27 (1288 bytes)[doc][blame][raw]

 1import { Shape } from './shape.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	let x = circle.x;
17	let y = circle.y;
18	if(circle.x < rect.x) {
19		x = rect.x;
20	}
21	else if(circle.x > rect.x + rect.shape.width) {
22		x = rect.x + rect.shape.width;
23	}
24	if(circle.y < rect.y) {
25		y = rect.y;
26	}
27	else if(circle.y > rect.y + rect.shape.height) {
28		y = rect.y + rect.shape.height;
29	}
30	const distance = Math.sqrt((circle.x - x) ** 2 + (circle.y - y) ** 2);
31	return distance <= circle.shape.radius;
32}
33
34export function collidePoint(object, point) {
35	if(object.shape instanceof Shape.Rect) {
36		const {x, y, shape: {width, height}} = object;
37		return x < point.x && x + width > point.x && y < point.y && y + height > point.y;
38	}
39	if(object.shape instanceof Shape.Circle) {
40		const {x, y, shape: {radius}} = object;
41		return Math.sqrt((x - point.x) ** 2 + (y - point.y) ** 2) < radius;
42	}
43}