let lines; let currentLine; let stgW = window.innerWidth; let stgH = window.innerHeight; let count = 0; function setup() { frameRate(15); createCanvas(stgW, stgH); initLines(); } function initLines(){ let w = stgW+5; let h = stgH+5; lines=[]; var rad = 2 * Math.PI * random(); currentLine = new Line( 0.5 * w + 0.7 * w * (random()-0.5), 0.5 * h + 0.7 * h * (random()-0.5), 0.5 * w + 2 * w * Math.cos(rad), 0.5 * h + 2 * h * Math.sin(rad) ); lines.push(currentLine); lines.push( new Line(-4.1,-4.1,-4,h) ); lines.push( new Line(-4.1,-4,w,-5.1) ); lines.push( new Line(-4.1,h+0.1,w,h) ); lines.push( new Line(w+0.1,0.1,w,h) ); count = 0; } function draw() { background(255); stroke(0); strokeWeight(10); //currentLine.move(); count++; if( lines.length > 45 || count> 45){ initLines(); count=0; return; } var distance = 1000000; var target = null; var targetPoint = null; //全ラインと、現ラインの交点を得る。 for(var i=0;i 40 && dist2 > 40 ){ //反射ベクトルから長いラインを作る currentLine = new Line( targetPoint.x - nx * 10.1, targetPoint.y - ny * 10.1, targetPoint.x - reflec.x * 4000 + 2000 * (random()-0.5), targetPoint.y - reflec.y * 4000 + 2000 * (random()-0.5) ); }else{ //やり直し //lines.push(currentLine); /* var rad = 2 * Math.PI * random(); var sx = targetPoint.x- reflec.x; var sy = targetPoint.y- reflec.y; currentLine = new Line( stgW * random(), stgH * random(), sx - 10000*(stgW*0.5-sx), sy - 10000*(stgH*0.5-sy) );*/ initLines(); return; } } for(var i=0;i Math.max(x0, x1) || x > Math.max(x2, x3) || y > Math.max(y0, y1) || y > Math.max(y2, y3) || x < Math.min(x0, x1) || x < Math.min(x2, x3) || x < Math.min(x0, x1) || y < Math.min(y2, y3) ) return false; if( Math.abs(this.startPoint.x - x)<1 && Math.abs(this.startPoint.y - y)<1 ) return false; return { x : x, y : y }; } draw(){ line(this.p1.x, this.p1.y, this.p2.x, this.p2.y); } move(){ this.p2.x += this.v.x*4; this.p2.y += this.v.y*4; } } class VectorUtil { static contain(p,sx,sy,ex,ey){ if(p.x > sx && p.x sy && p.y

reflection