forked from arne/asdf-games
79 lines
1.3 KiB
JavaScript
79 lines
1.3 KiB
JavaScript
const math = require("./math");
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const Rect = require("../Rect");
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function addDebug(e) {
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e.children = e.children || [];
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const bb = new Rect(e.w, e.h, { fill: "rgba(255, 0, 0, 0.3)" });
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e.children.push(bb);
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if (e.hitBox) {
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const { x, y, w, h } = e.hitBox;
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const hb = new Rect(w, h, { fill: "rgba(255, 0, 0, 0.5)" });
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hb.pos.x = x;
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hb.pos.y = y;
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e.children.push(hb);
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}
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return e;
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}
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function angle(a, b) {
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return math.angle(center(a), center(b));
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}
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function bounds(entity) {
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const { w, h, pos, hitBox } = entity;
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const hit = hitBox || { x: 0, y: 0, w, h };
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return {
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x: hit.x + pos.x,
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y: hit.y + pos.y,
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w: hit.w - 1,
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h: hit.h - 1
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};
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}
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function center(entity) {
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const { pos, w, h } = entity;
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return {
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x: pos.x + w / 2,
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y: pos.y + h / 2
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};
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}
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function distance(a, b) {
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return math.distance(center(a), center(b));
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}
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function hit(e1, e2) {
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const a = bounds(e1);
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const b = bounds(e2);
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return (
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a.x + a.w >= b.x &&
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a.x <= b.x + b.w &&
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a.y + a.h >= b.y &&
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a.y <= b.y + b.h
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);
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}
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function hits(entity, container, hitCallback) {
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const a = bounds(entity);
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container.map(e2 => {
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const b = bounds(e2);
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if (
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a.x + a.w >= b.x &&
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a.x <= b.x + b.w &&
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a.y + a.h >= b.y &&
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a.y <= b.y + b.h
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) {
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hitCallback(e2);
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}
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});
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}
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module.exports = {
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addDebug,
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angle,
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bounds,
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center,
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distance,
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hit,
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hits
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}; |