java/examples/Basics/Transform/Arm/Arm.pde

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+/**
+ * Arm. 
+ * 
+ * The angle of each segment is controlled with the mouseX and
+ * mouseY position. The transformations applied to the first segment
+ * are also applied to the second segment because they are inside
+ * the same pushMatrix() and popMatrix() group.
+*/
+
+float x = 50;
+float y = 100;
+float angle1 = 0.0;
+float angle2 = 0.0;
+float segLength = 50;
+
+void setup() {
+  size(200, 200);
+  smooth(); 
+  strokeWeight(20.0);
+  stroke(0, 100);
+}
+
+void draw() {
+  background(226);
+  
+  angle1 = (mouseX/float(width) - 0.5) * -PI;
+  angle2 = (mouseY/float(height) - 0.5) * PI;
+  
+  pushMatrix();
+  segment(x, y, angle1); 
+  segment(segLength, 0, angle2);
+  popMatrix();
+}
+
+void segment(float x, float y, float a) {
+  translate(x, y);
+  rotate(a);
+  line(0, 0, segLength, 0);
+}

java/examples/Basics/Transform/Arm/applet/Arm.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 Arm extends PApplet {
+
+/**
+ * Arm. 
+ * 
+ * The angle of each segment is controlled with the mouseX and
+ * mouseY position. The transformations applied to the first segment
+ * are also applied to the second segment because they are inside
+ * the same pushMatrix() and popMatrix() group.
+*/
+
+float x = 50;
+float y = 100;
+float angle1 = 0.0f;
+float angle2 = 0.0f;
+float segLength = 50;
+
+public void setup() {
+  size(200, 200);
+  smooth(); 
+  strokeWeight(20.0f);
+  stroke(0, 100);
+}
+
+public void draw() {
+  background(226);
+  
+  angle1 = (mouseX/PApplet.parseFloat(width) - 0.5f) * -PI;
+  angle2 = (mouseY/PApplet.parseFloat(height) - 0.5f) * PI;
+  
+  pushMatrix();
+  segment(x, y, angle1); 
+  segment(segLength, 0, angle2);
+  popMatrix();
+}
+
+public void segment(float x, float y, float a) {
+  translate(x, y);
+  rotate(a);
+  line(0, 0, segLength, 0);
+}
+
+  static public void main(String args[]) {
+    PApplet.main(new String[] { "Arm" });
+  }
+}

java/examples/Basics/Transform/Arm/applet/Arm.pde

@@ -0,0 +1,39 @@
+/**
+ * Arm. 
+ * 
+ * The angle of each segment is controlled with the mouseX and
+ * mouseY position. The transformations applied to the first segment
+ * are also applied to the second segment because they are inside
+ * the same pushMatrix() and popMatrix() group.
+*/
+
+float x = 50;
+float y = 100;
+float angle1 = 0.0;
+float angle2 = 0.0;
+float segLength = 50;
+
+void setup() {
+  size(200, 200);
+  smooth(); 
+  strokeWeight(20.0);
+  stroke(0, 100);
+}
+
+void draw() {
+  background(226);
+  
+  angle1 = (mouseX/float(width) - 0.5) * -PI;
+  angle2 = (mouseY/float(height) - 0.5) * PI;
+  
+  pushMatrix();
+  segment(x, y, angle1); 
+  segment(segLength, 0, angle2);
+  popMatrix();
+}
+
+void segment(float x, float y, float a) {
+  translate(x, y);
+  rotate(a);
+  line(0, 0, segLength, 0);
+}