java/examples/Basics/Math/IncrementDecrement/applet/IncrementDecrement.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 IncrementDecrement extends PApplet {
+
+/**
+ * Increment Decrement. 
+ * 
+ * Writing "a++" is equivalent to "a = a + 1".  
+ * Writing "a--" is equivalent to "a = a - 1".   
+ */
+ 
+int a;
+int b;
+boolean direction;
+
+public void setup()
+{
+  size(200, 200);
+  colorMode(RGB, width);
+  a = 0;
+  b = width;
+  direction = true;
+  frameRate(30);
+}
+
+public void draw()
+{
+  a++;
+  if(a > width) {
+    a = 0;
+    direction = !direction;
+  }
+  if(direction == true){
+    stroke(a);
+  } else {
+    stroke(width-a);
+  }
+  line(a, 0, a, height/2);
+
+  b--;
+  if(b < 0) {
+    b = width;
+  }
+  if(direction == true) {
+    stroke(width-b);
+  } else {
+    stroke(b);
+  }
+  line(b, height/2+1, b, height);
+}
+
+  static public void main(String args[]) {
+    PApplet.main(new String[] { "IncrementDecrement" });
+  }
+}