"pathfinders" - OpenProcessing

mySketch
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function twolineintersect(x1,y1,x2,y2,x3,y3,x4,y4){if((x1==x2&&y1==y2)||(x3==x4&&y3==y4)){return false}denominator=((y4-y3)*(x2-x1)-(x4-x3)*(y2-y1));if(denominator==0){return false}let ua=((x4-x3)*(y1-y3)-(y4-y3)*(x1-x3))/denominator;let ub=((x2-x1)*(y1-y3)-(y2-y1)*(x1-x3))/denominator;if(ua<0||ua>1||ub<0||ub>1){return false}let x=x1+ua*(x2-x1);let y=y1+ua*(y2-y1);return [x,y]}
​
let lines = [],
    ghosts = []
​
function setup() {
  createCanvas(400,400);
  for(let i=0;i<10;i++){
    lines.push([Math.random()*400, Math.random()*400, Math.random()*400, Math.random()*400])
  }
  ghosts.push([0,0,[]])
  ghosts.push([0,0,[]])
  ghosts.push([0,0,[]])
  ghosts.push([0,0,[]])
}
​
function draw() {
  ghosts[0] = [mouseX, mouseY]
  ghosts[1] = [
    Math.cos(noise(frameCount/600)*Math.PI*2)*250*noise(frameCount/300 + 20)+150,
    Math.sin(noise(frameCount/600)*Math.PI*2)*250*noise(frameCount/300 + 20)+250
  ]
  ghosts[2] = [
    Math.cos(noise(300 + frameCount/600)*Math.PI*2)*250*noise(300 + frameCount/300 + 20)+150,
    Math.sin(noise(300 + frameCount/600)*Math.PI*2)*250*noise(300 + frameCount/300 + 20)+150
  ]
  ghosts[3] = [
    Math.cos(noise(600 + frameCount/600)*Math.PI*2)*250*noise(600 + frameCount/300 + 20)+250,
    Math.sin(noise(600 + frameCount/600)*Math.PI*2)*250*noise(600 + frameCount/300 + 20)+200
  ]
  background(255)
  for(let j=0;j<ghosts.length;j++){
    ghosts[j][2] = [] //ray list
    for(let i=0;i<lines.length;i++){
      ghosts[j][2].push([lines[i][0], lines[i][1]])
      ghosts[j][2].push([lines[i][2], lines[i][3]])
    }
    for(let i=0;i<j;i++){
      ghosts[j][2].push([ghosts[i][0], ghosts[i][1]])
      ghosts[i][2].push([ghosts[j][0], ghosts[j][1]])
    }
  }
  stroke(0);strokeWeight(2)
  for(let i=0;i<lines.length;i++){
    line(...lines[i])
    for(let j=0;j<ghosts.length;j++){
      for(let k=0;k<ghosts[j][2].length;k++){
        if(ghosts[j][2][k][0] == lines[i][0] && ghosts[j][2][k][1] == lines[i][1]) continue
        if(ghosts[j][2][k][0] == lines[i][2] && ghosts[j][2][k][1] == lines[i][3]) continue
        if(ghosts[j][2][k]) if(twolineintersect(...lines[i], ghosts[j][0], ghosts[j][1], ...ghosts[j][2][k]))ghosts[j][2][k] = false  
      }
    }
  }
  strokeWeight(1)
  for(let i=0;i<ghosts.length;i++){
    stroke('#F00')
    for(let j=0;j<ghosts[i][2].length;j++) if(ghosts[i][2][j]) line(ghosts[i][0], ghosts[i][1], ...ghosts[i][2][j])
    noStroke();fill(0)
    circle(ghosts[i][0], ghosts[i][1], 5)
  }
}