Re-adding Topics to SVN

java/examples/Topics/Image Processing/PixelArray/PixelArray.pde

@@ -0,0 +1,48 @@
+/**
+ * Pixel Array. 
+ * 
+ * Click and drag the mouse up and down to control the signal and 
+ * press and hold any key to see the current pixel being read. 
+ * This program sequentially reads the color of every pixel of an image
+ * and displays this color to fill the window.  
+ * 
+ * Updated 28 February 2010.
+ */
+ 
+PImage img;
+int direction = 1;
+float signal;
+
+void setup() {
+  size(200, 200);
+  noFill();
+  stroke(255);
+  frameRate(30);
+  img = loadImage("ystone08.jpg");
+}
+
+void draw() {
+  if (signal > img.width*img.height-1 || signal < 0) { 
+    direction = direction * -1; 
+  }
+
+  if (mousePressed) {
+    int mx = constrain(mouseX, 0, img.width-1);
+    int my = constrain(mouseY, 0, img.height-1);
+    signal = my*img.width + mx;
+  } else {
+    signal += 0.33*direction;
+  }
+
+  int sx = int(signal) % img.width;
+  int sy = int(signal) / img.width;
+
+  if (keyPressed) {
+    set(0, 0, img);  // fast way to draw an image
+    point(sx, sy);
+    rect(sx - 5, sy - 5, 10, 10);
+  } else {
+    color c = img.get(sx, sy);
+    background(c);
+  }
+}