/*
 * Demonstration of use of image in mandala.
 */

int bands = 50;
float outerSize = 1.2;  // size of outer ellipse, as percentage of full
float innerSize = 0.6;  // size of inner ellipse, as percentage of full

void setup() {
  background(0);
  // PImage slu = loadImage("campus4.jpg");
  PImage slu = loadImage("http://business.slu.edu/uploads/2012/11/08/slu-homepage-campus4.jpg");
  int w = slu.width;
  int h = slu.height;
  size(2*w, 2*h);
  image(slu,0,0);

  PGraphics mask = createGraphics(w, h);
  mask.beginDraw();
  mask.background(0);
  mask.noSmooth();
  mask.noStroke();
  for (int j=0; j < bands; j++) {
    float pct = float(j)/(bands-1);
    mask.fill(pct*255);    // gradiant shading
    float scale = innerSize * pct + outerSize * (1-pct);
    mask.ellipse(0.5*w, 0.5*h, scale*w, scale*h);
  }
  mask.endDraw();
  slu.mask(mask);

  image(mask,w,0);

  image(slu,0,h);
  
  // and once more fading to white
  fill(255);
  rect(w,h,w,h);
  image(slu,w,h);
}