java/examples/Basics/Input/MouseFunctions/applet/MouseFunctions.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 MouseFunctions extends PApplet {
+
+/**
+ * Mouse Functions. 
+ * 
+ * Click on the box and drag it across the screen. 
+ */
+ 
+float bx;
+float by;
+int bs = 20;
+boolean bover = false;
+boolean locked = false;
+float bdifx = 0.0f; 
+float bdify = 0.0f; 
+
+
+public void setup() 
+{
+  size(200, 200);
+  bx = width/2.0f;
+  by = height/2.0f;
+  rectMode(CENTER_RADIUS);  
+}
+
+public void draw() 
+{ 
+  background(0);
+  
+  // Test if the cursor is over the box 
+  if (mouseX > bx-bs && mouseX < bx+bs && 
+      mouseY > by-bs && mouseY < by+bs) {
+    bover = true;  
+    if(!locked) { 
+      stroke(255); 
+      fill(153);
+    } 
+  } else {
+    stroke(153);
+    fill(153);
+    bover = false;
+  }
+  
+  // Draw the box
+  rect(bx, by, bs, bs);
+}
+
+public void mousePressed() {
+  if(bover) { 
+    locked = true; 
+    fill(255, 255, 255);
+  } else {
+    locked = false;
+  }
+  bdifx = mouseX-bx; 
+  bdify = mouseY-by; 
+
+}
+
+public void mouseDragged() {
+  if(locked) {
+    bx = mouseX-bdifx; 
+    by = mouseY-bdify; 
+  }
+}
+
+public void mouseReleased() {
+  locked = false;
+}
+
+
+  static public void main(String args[]) {
+    PApplet.main(new String[] { "MouseFunctions" });
+  }
+}