java/examples/Topics/Animation/AnimatedSprite/applet/AnimatedSprite.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 AnimatedSprite extends PApplet {
+
+/**
+ * Animated Sprite (Shifty + Teddy)
+ * by James Patterson. 
+ * 
+ * Press the mouse button to change animations.
+ * Demonstrates loading, displaying, and animating GIF images.
+ * It would be easy to write a program to display 
+ * animated GIFs, but would not allow as much control over 
+ * the display sequence and rate of display. 
+ */
+ 
+Animation animation1, animation2;
+float xpos, ypos;
+float drag = 30.0f;
+
+public void setup() {
+  size(200, 200);
+  background(255, 204, 0);
+  frameRate(24);
+  animation1 = new Animation("PT_Shifty_", 38);
+  animation2 = new Animation("PT_Teddy_", 60);
+}
+
+public void draw() { 
+  float difx = mouseX - xpos;
+  if (abs(difx) > 1.0f) {
+    xpos = xpos + difx/drag;
+    xpos = constrain(xpos, 0, width);
+  }
+
+  // Display the sprite at the position xpos, ypos
+  if (mousePressed) {
+    background(153, 153, 0);
+    animation1.display(xpos-animation1.getWidth()/2, ypos);
+  } else {
+    background(255, 204, 0);
+    animation2.display(xpos-animation1.getWidth()/2, ypos);
+  }
+}
+// Class for animating a sequence of GIFs
+
+class Animation {
+  PImage[] images;
+  int imageCount;
+  int frame;
+  
+  Animation(String imagePrefix, int count) {
+    imageCount = count;
+    images = new PImage[imageCount];
+
+    for (int i = 0; i < imageCount; i++) {
+      // Use nf() to number format 'i' into four digits
+      String filename = imagePrefix + nf(i, 4) + ".gif";
+      images[i] = loadImage(filename);
+    }
+  }
+
+  public void display(float xpos, float ypos) {
+    frame = (frame+1) % imageCount;
+    image(images[frame], xpos, ypos);
+  }
+  
+  public int getWidth() {
+    return images[0].width;
+  }
+}
+
+  static public void main(String args[]) {
+    PApplet.main(new String[] { "AnimatedSprite" });
+  }
+}