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<html> <head> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <script src="https://cdn.jsdelivr.net/npm/p5@1.2.0/lib/p5.js"></script> <script src="https://cdn.jsdelivr.net/npm/p5@1.2.0/lib/p5.dom.js"></script> <style> body{background-color:black;margin:0;padding:0;} </style> </head> <body> <script> let rays=[]; let stars=[]; let sep=3; let num=3; //let num=3+random()*5; function setup(){ createCanvas(window.innerWidth,window.innerHeight); background(0); for(let i=0;i<num;i++){ stars.push(new Star(random(width),random(height))); } for(let i=0;i<height;i+=sep){ rays.push(new Beam(0,i,noise(i/200),[stars])); } } function draw(){ for(let i=rays.length-1;i>=0;i--){ if(rays[i].show){ rays[i].show(); rays[i].update(); if(rays[i].pos.x>width || rays[i].pos.y>height || rays[i].pos.y<0){ rays=rays.slice(0,i).concat(rays.slice(i+1,rays.length)); } } } /*for(let i=0;i<stars.length;i++){ stars[i].update(); stroke(255); circle(stars[i].pos.x,stars[i].pos.y,50); }*/ } class Beam{ constructor(x,y,noise,targets){ this.pos=createVector(x,y); this.vel=p5.Vector.fromAngle(noise*PI-PI/2); //this.vel=createVector(1,0); this.pX=x; this.pY=y; this.targets=targets; this.acc=createVector(0,0); } show(){ stroke(255); line(this.pos.x,this.pos.y,this.pX,this.pY); } update(){ this.pX=this.pos.x; this.pY=this.pos.y; this.calcForce(); this.vel.add(this.acc); this.vel.limit(2); this.pos.add(this.vel); this.acc.mult(0); } calcForce(){ for(let i=0;i<this.targets.length;i++){ let dir=p5.Vector.sub(this.targets[i].pos,this.pos); if(dir.mag()<3){ //this.targets=this.targets.slice(0,i).concat(this.targets.slice(i+1,this.targets.length)); } else{ let mag=100*this.targets[i].strength/(dir.mag()**2); dir.setMag(mag); this.acc.add(dir); } } } } class Star{ constructor(x,y){ this.pos=createVector(x,y); this.strength=random()*10; this.noise=random()*1000; } update(){ this.pos.add(p5.Vector.fromAngle(TWO_PI*noise(this.noise))); this.noise+=0.01; } } </script> </body></html>
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