java/examples/Basics/Image/Transparency/applet/Transparency.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 Transparency extends PApplet {
+
+/**
+ * Transparency. 
+ * 
+ * Move the pointer left and right across the image to change
+ * its position. This program overlays one image over another 
+ * by modifying the alpha value of the image with the tint() function. 
+ */
+
+PImage a, b;
+float offset;
+
+public void setup() {
+  size(200, 200);
+  a = loadImage("construct.jpg");  // Load an image into the program 
+  b = loadImage("wash.jpg");   // Load an image into the program 
+  frameRate(60);
+}
+
+public void draw() { 
+  image(a, 0, 0);
+  float offsetTarget = map(mouseX, 0, width, -b.width/2 - width/2, 0);
+  offset += (offsetTarget-offset)*0.05f; 
+  tint(255, 153);
+  image(b, offset, 20);
+}
+
+
+
+
+
+
+  static public void main(String args[]) {
+    PApplet.main(new String[] { "Transparency" });
+  }
+}