pts.js 线条与粒子效果插件，通过他可以创建很多丰富的特效-BFW插件库

pts.js 线条与粒子效果插件，通过他可以创建很多丰富的特效

第一步引入bfwone 加载依赖项pts

第二步执行插件代码

示例如下

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>BFW NEW PAGE</title>
    <script id="bfwone" data="dep=pts&err=0" type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/bfwone.js"></script>
    <script type="text/javascript">
        bready(function() {
            window.demoDescription = "Particles colliding with each other in space. Move the pointer to hit them like billiard balls.";

            Pts.quickStart("#pt", "#123");

            //// Demo code starts (anonymous function wrapper is optional) ---

            (function() {

                var world;

                space.add( {

                    start: (bound, space) => {

                        // Create world and 100 random points
                        world = new World(space.innerBound, 1, 0);
                        let pts = Create.distributeRandom(space.innerBound, 100);

                        // Create particles and hit them with a random impulse
                        for (let i = 0, len = pts.length; i < len; i++) {
                            let p = new Particle(pts[i]).size((i === 0) ? 30: 3+Math.random()*space.size.x/50);
                            p.hit(Num.randomRange(-50, 50), Num.randomRange(-25, 25));
                            world.add(p);
                        }

                        world.particle(0).lock = true; // lock it to move it by pointer later on

                    },


                    animate: (time, ftime) => {
                        world.drawParticles((p, i) => {
                            let color = (i === 0) ? "#fff": ["#ff2d5d", "#42dc8e", "#2e43eb", "#ffe359"][i%4];
                            form.fillOnly(color).point(p, p.radius, "circle")
                        });

                        world.update(ftime);
                    },


                    action: (type, px, py) => {
                        if (type == "move") {
                            world.particle(0).position = new Pt(px, py);
                        }
                    },

                    resize: (bound, evt) => {
                        if (world) world.bound = space.innerBound;
                    }
                });

                space.bindMouse().bindTouch();
                space.play();

            })();
        });
    </script>
</head>
<body>

</body>
</html>

官方 https://ptsjs.org/

demo https://ptsjs.org/demo/?name=circle.intersectCircle2D