orbital mechanics - OpenProcessing

render
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let orbits=[],
    lastmp=[0,0]
​
setup=_=>{
  createCanvas(500,400)
  frameRate(40)
}
​
draw=_=>{
  orbits[0]=[100,10000,[0,Math.sin(frameCount/200),Math.cos(frameCount/200)]]
  orbits[1]=tra2orb([0,100],[100*sin(frameCount/200),1*cos(frameCount/200)])
  if(mouseIsPressed)orbits[2]=tra2orb(lastmp,[mouseX-lastmp[0]-250,-mouseY+lastmp[1]+200])
  background(0)
  for(let i=0;i<orbits.length;i++){
    let last=orb2tra(orbits[i],0)
    for(let j=1;j<101;j++){
      let a=orb2tra(orbits[i],j/50*Math.PI)
      stroke(255*(a[2][2]/2+0.5));line(last[0][0]+250,last[0][1]+200,a[0][0]+250,a[0][1]+200)
      last=a
      //fill(255*(a[2][2]/2+0.5));noStroke();circle(a[0][0]+250,a[0][1]+200,5)
      //stroke(255,0,0);line(a[0][0]+250,a[0][1]+200,a[0][0]+250+a[1][0],a[0][1]+200+a[1][1])
    }
  }
}
​
mousePressed=_=>{
  lastmp=[mouseX-250,mouseY-250]
}