java/examples/Basics/Image/Sprite2/Sprite2.pde

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+/**
+ * Sprite2 (Teddy)
+ * by James Patterson. 
+ * 
+ * Demonstrates loading and displaying a transparent GIF image. 
+ * This alternate version shows a sky image in the background.
+ */
+ 
+PImage teddy;
+PImage sky;
+
+float xpos;
+float ypos;
+float drag = 30.0;
+
+void setup() {
+  size(200, 200);
+  teddy = loadImage("teddy.gif");
+  sky = loadImage("sky.jpg");
+  xpos = width/2;
+  ypos = height/2;
+  // resize the background image so that it fills the screen
+  if (sky.width != width || sky.height != height) {
+    sky.resize(width, height);
+  }
+}
+
+void draw() {
+  background(sky);
+  
+  float difx = mouseX - xpos-teddy.width/2;
+  if (abs(difx) > 1) {
+    xpos = xpos + difx/drag;
+    xpos = constrain(xpos, 0, width-teddy.width);
+  }  
+  
+  float dify = mouseY - ypos-teddy.height/2;
+  if (abs(dify) > 1 ) {
+    ypos = ypos + dify/drag;
+    ypos = constrain(ypos, 0, height-teddy.height);
+  }  
+  
+  // Display the sprite at the position xpos, ypos
+  image(teddy, xpos, ypos);
+}