Animated dot-on-line test

class pnt {

  float x, y;

  pnt(int px, int py) {

    x=float(px);

    y=float(py);

  }

  pnt(float px, float py) {

    x=px;

    y=py;

  }

}

class dotLine {

  pnt start,end;

  color dotColor, endColor, lineColor;

  float drad, dProgress, endRad,len;

  dotLine(pnt pstart, pnt pend, color pDotColor, color pEndColor, color pLineColor, float pdrad, float pdProgress, float pEndRad) {

    start = pstart;

    end = pend;

    dotColor = pDotColor;

    endColor = pEndColor;

    lineColor = pLineColor;

    drad = pdrad;

    dProgress=pdProgress;

    endRad=pEndRad;

    len = sqrt(pow((end.x-start.x),2)+pow((end.y-start.y),2));

  }

  void draw() {

    fill(endColor);

    ellipse(start.x,start.y,endRad,endRad);

    ellipse(end.x,end.y,endRad,endRad);

    fill(lineColor);

    line(start.x,start.y,end.x,end.y);

    float xDiff = end.x - start.x;

    float yDiff = end.x - start.x;

    float dPercent=((100/len)*dProgress)/100;

    float xNew = start.x + (xDiff * dPercent);

    float yNew = start.y + (yDiff * dPercent);

    fill(dotColor);

    tint(255,128);

    ellipse(xNew,yNew,drad,drad);

  }

}

pnt start,end;

color dotColor,lineColor,endColor;

dotLine test;

float progress;

boolean isAdding;

void setup() {

  size(800,600);

  start = new pnt(5,5);

  end = new pnt(450,450);

  dotColor=color(0,0,255);

  lineColor=color(255,255,255);

  endColor=color(255,255,255);

  test=new dotLine(start,end,dotColor,endColor,lineColor,10,15,5);

  isAdding=true;

}

void draw() {

  background(128);

  if ((progress>=test.len && isAdding==true)||(progress<=0 && isAdding==false)) {

    isAdding = !isAdding;

  } else if (isAdding==true) {

    test.end.x=test.end.x+1.5;

    test.end.y=test.end.y+1;

    test.start.x=test.start.x+1.5;

    test.start.y=test.start.y+1;

    progress=progress+5;

  } else if (isAdding==false) {

    test.end.x=test.end.x-1.5;

    test.end.y=test.end.y-1;

    test.start.x=test.start.x-1.5;

    test.start.y=test.start.y-1;

    progress=progress-5;

  }

  print(progress + " " + test.len + "\n");

  test.dProgress=progress;

  test.draw();

}

​