sketchPatch

/**
 * by Evan Rakob AKA PixelPusher 
 * // http://pixelist.info
 **/
// push the mouse to see it in action
// this will be the lag variable
float drag = 0.0;
int maxRows = 2;
int maxCols = 40;
void setup()
{
  size(480, 270);
  colorMode(HSB);
 drag = 0.0;
 maxRows = 2;
  maxCols = 40;
}
// When the mouse is pressed, jump our lag variable to its high value
void mouseReleased()
{
  drag = 6.0;
}
void draw()
{
  background(80);  // clear screen to gray
  noStroke();
  // every time we draw, decrease our lag variable by some percent (the higher the value,
  // the slower the decrease
  drag *= 0.92;
  // the easy way:
  //int mx = (int) (drag * map(mouseX, 0, width, 1, 30));
  // a bit more straightforward:
  int mx = 4 + (int) (maxCols * drag * (float)mouseX/(float)width + 1);
  float interval = (float)width/mx;
  for (int b=0; b < maxRows; b++)
  {   
    // draw some alternating lines on the screen
    for (int c=0; c < mx; c++)
    {
      if (b % 2 == 0)
        fill(190.0 * c/(mx-1), 220, 200);
      else
        fill(190.0 - 190.0 * c/(mx-1), 220, 200);
      rect(c*interval, b*height/maxRows, interval, (b+1)*height/maxRows);
    }
  }
}

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