Vert Point, Point2, P1, P2;
Line surface, motionPath;
float lineLineDist;
float cPoint;

void setup() {
  background(255);
  size(400, 200);
  
  Point = new Vert(200, 20);
  Point2 = new Vert(0, 0);
  
  P1 = new Vert(random(40, 120), random(100, 190));
  P2 = new Vert(random(280, 360), random(100, 190));
  
  surface = new Line(P1, P2);
  motionPath = new Line(Point, Point2);
}

float distTarget = 25;

void draw() {
  fill(255);
  rect(0, 0, width, height);
  
  smooth();
  stroke(0);
  strokeWeight(0.5);
  
  lineLineDist = distLineToLine(motionPath, surface);
  if (lineLineDist < 25) {
    background(225);
  } 
  
  fill(255, 255, 255, 160);
  ellipse(mouseX, mouseY, 50, 50);
  Point.update();
  Point2.update();
  
  float totalDist = distance(Point, Point2);
  stroke(0, 0, 255);
  strokeWeight(8);
  motionPath.drawCpoint();
  surface.drawCpoint();
  
  float near = Point2.distPointToLine(surface);
  float far = Point.distPointToLine(surface);
  
  if (lineLineDist < 0.0001) near = -near;
  
  println(near);
  
  float distDiff = far - near;
  float distTrack = far - distTarget;
  
  float targetV = (distTrack / distDiff);
  
  stroke(0, 160, 255);
  motionPath.drawTargetPoint(targetV);
  
  stroke(0);
  strokeWeight(0.5);
  
  surface.update();
  motionPath.update(mouseX, mouseY);
  
};