java/examples/Basics/Math/Distance2D/applet/Distance2D.java

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+import processing.core.*; 
+
+import java.applet.*; 
+import java.awt.*; 
+import java.awt.image.*; 
+import java.awt.event.*; 
+import java.io.*; 
+import java.net.*; 
+import java.text.*; 
+import java.util.*; 
+import java.util.zip.*; 
+import java.util.regex.*; 
+
+public class Distance2D extends PApplet {
+
+/**
+ * Distance 2D. 
+ * 
+ * Move the mouse across the image to obscure and reveal the matrix.  
+ * Measures the distance from the mouse to each square and sets the
+ * size proportionally. 
+ */
+ 
+float max_distance;
+
+public void setup() {
+  size(200, 200); 
+  smooth();
+  noStroke();
+  max_distance = dist(0, 0, width, height);
+}
+
+public void draw() 
+{
+  background(51);
+
+  for(int i = 0; i <= width; i += 20) {
+    for(int j = 0; j <= height; j += 20) {
+      float size = dist(mouseX, mouseY, i, j);
+      size = size/max_distance * 66;
+      ellipse(i, j, size, size);
+    }
+  }
+}
+
+  static public void main(String args[]) {
+    PApplet.main(new String[] { "Distance2D" });
+  }
+}

java/examples/Basics/Math/Distance2D/applet/Distance2D.pde

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+/**
+ * Distance 2D. 
+ * 
+ * Move the mouse across the image to obscure and reveal the matrix.  
+ * Measures the distance from the mouse to each square and sets the
+ * size proportionally. 
+ */
+ 
+float max_distance;
+
+void setup() {
+  size(200, 200); 
+  smooth();
+  noStroke();
+  max_distance = dist(0, 0, width, height);
+}
+
+void draw() 
+{
+  background(51);
+
+  for(int i = 0; i <= width; i += 20) {
+    for(int j = 0; j <= height; j += 20) {
+      float size = dist(mouseX, mouseY, i, j);
+      size = size/max_distance * 66;
+      ellipse(i, j, size, size);
+    }
+  }
+}