Demonstration of for-loop with moving lines

lines.pde

//Autor: Christopher Schölzel
float x1,y1; //erster Punkt für unteres Linienende
float x2,y2; //zweiter Punkt für unteres Linienende

void setup() {
  size(400,400);
  x1 = 0;
  y1 = height;
  x2 = width;
  y2 = height;
}

void draw() {
  background(255);
  stroke(0);
  for(int i = 0; i < 100; i++) {
    float lambda = i/100.0; //Fortschritt zw. 0 und 1
    float cx2 = x1+lambda*(x2-x1);
    float cy2 = y1+lambda*(y2-y1);
    line(width*lambda,0,cx2,cy2);
  }
}

void mouseMoved() {
  x1 = width-mouseX;
  x2 = mouseX;
}