java/examples/Basics/Image/Pointillism/Pointillism.pde

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+/**
+ * Pointillism
+ * by Daniel Shiffman. 
+ * 
+ * Mouse horizontal location controls size of dots. 
+ * Creates a simple pointillist effect using ellipses colored
+ * according to pixels in an image. 
+ * 
+ * Updated 27 February 2010.
+ */
+ 
+PImage img;
+
+int smallPoint = 2;
+int largePoint;
+int top, left;
+
+void setup() {
+  size(200, 200);
+  img = loadImage("eames.jpg");
+  //img = loadImage("sunflower.jpg");  // an alternative image
+  noStroke();
+  background(255);
+  smooth();
+  largePoint = min(width, height) / 10;
+  // center the image on the screen
+  left = (width - img.width) / 2;
+  top = (height - img.height) / 2;
+}
+
+void draw() { 
+  float pointillize = map(mouseX, 0, width, smallPoint, largePoint);
+  int x = int(random(img.width));
+  int y = int(random(img.height));
+  color pix = img.get(x, y);
+  fill(pix, 128);
+  ellipse(left + x, top + y, pointillize, pointillize);
+}