Polar Lines w/ Processing.js

/*
 * Copyright (c) 2006-2008 Karsten Schmidt
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * http://creativecommons.org/licenses/LGPL/2.1/
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */


var Vec2D = toxi.geom.Vec2D;

import toxi.geom.*;

void setup() {
  size(640,560);
  smooth();
}

void draw() {
  background(245);
  translate(width/2,height/2);
  stroke(255,0,0);
  strokeWeight(2);

  Vec2D a= new Vec2D(10,0);

  Vec2D b=new Vec2D(mouseX,mouseY).sub(width/2,height/2).toPolar();

  b.y+=4*PI;

  for(int i=0, num=200; i<num; i++) {

    Vec2D p=a.interpolateTo(b,(float)i/num).toCartesian();
    point(p.x,p.y);
  }

  a.toCartesian();
  b.toCartesian();
  stroke(0,0,255);

  for(int i=0,num=50; i<num; i++) {

    Vec2D p=a.interpolateTo(b,(float)i/num);
    point(p.x,p.y);
  }
}