java/examples/Basics/Arrays/Array2D/Array2D.pde

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+/**
+ * Array 2D. 
+ * 
+ * Demonstrates the syntax for creating a two-dimensional (2D) array.
+ * Values in a 2D array are accessed through two index values.  
+ * 2D arrays are useful for storing images. In this example, each dot 
+ * is colored in relation to its distance from the center of the image. 
+ */
+ 
+float[][] distances;
+float maxDistance;
+
+size(200, 200);
+background(0);
+maxDistance = dist(width/2, height/2, width, height);
+distances = new float[width][height];
+for(int i=0; i<height; i++) {
+  for(int j=0; j<width; j++) {
+    float dist = dist(width/2, height/2, j, i);
+    distances[j][i] = dist/maxDistance * 255; 
+  }
+}
+
+for(int i=0; i<height; i+=2) {
+  for(int j=0; j<width; j+=2) {
+    stroke(distances[j][i]);
+    point(j, i);
+  }
+}
+
+
+