sketchPatch

/**
 * Draw some lines like MC Escher would have...
 * by Evan Rakob AKA PixelPusher 
* // http://pixelist.info
 **/
 // the initial spacing between lines, in pixels
 float spacing = 1f;
 // line width in pixels (from middle of line)
 int lineWidth = 1;
 // the multiplier for the spacing of successive lines
 float spaceMult = 1.001f;
 boolean mouseDown = false;
 int[] startMouse = new int[2];
 int[] lastMouse = new int[2];
 void setup()
 {
     size(360, 240);
     background(0);
     strokeWeight(lineWidth);
     spacing = 1f;
  lineWidth = 1;
  spaceMult = 1.001f;
  mouseDown = false;
  startMouse = new int[2];
  lastMouse = new int[2];
     startMouse[0] = -1;
     startMouse[1] = -1;
 }
 void draw()
 {
   background(0);
   if (mouseDown)
   {
       if (lastMouse[1] != mouseY)
       {
         spaceMult += (startMouse[1]-mouseY)*0.001;
         spaceMult = max(spaceMult, 1.001);
         lastMouse[1] = mouseY;
       }
       else
       {
         startMouse[1] = mouseY;
       }
   }
   int ctr=0;  // counter var
   float space = spacing;
   //first draw white bg below
   fill(255);
   noStroke();
   rect(0, 0, width, height*0.5);
   // draw black lines from center to top
   ctr = int(height*0.5-space);
   strokeWeight(lineWidth);
   stroke(0);
   while (ctr > 0)
   {
     line(0, ctr, width, ctr);
     ctr -= int(2*space);
     space *= spaceMult;
   }
   // draw white lines from center to bottom
   stroke(255);
   space = spacing;
   ctr = int(height*0.5-space);
   while (ctr < height)
   {
     line(0, ctr, width, ctr);
     ctr += int(2*space);
     space *= spaceMult;
   }
 }
void mousePressed() 
{
   startMouse[0] = mouseX;  
   startMouse[1] = mouseY;
   lastMouse[0] = startMouse[0];
   lastMouse[1] = startMouse[1];
   mouseDown = true;
}
void mouseReleased() 
{
   mouseDown = false;
}

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