Initial Commit

Java/Processing/processing-3.3.6/modes/java/examples/Basics/Image/RequestImage/RequestImage.pde

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+/**
+ * Request Image
+ * by Ira Greenberg ( From Processing for Flash Developers). 
+ * 
+ * Shows how to use the requestImage() function with preloader animation. 
+ * The requestImage() function loads images on a separate thread so that 
+ * the sketch does not freeze while they load. It's very useful when you are
+ * loading large images. 
+ * 
+ * These images are small for a quick download, but try it with your own huge 
+ * images to get the full effect. 
+ */
+
+int imgCount = 12;
+PImage[] imgs = new PImage[imgCount];
+float imgW;
+
+// Keeps track of loaded images (true or false)
+boolean[] loadStates = new boolean[imgCount];
+
+// For loading animation
+float loaderX, loaderY, theta;
+
+void setup() {
+  size(640, 360);
+  imgW = width/imgCount;
+
+  // Load images asynchronously
+  for (int i = 0; i < imgCount; i++){
+    imgs[i] = requestImage("PT_anim"+nf(i, 4)+".gif");
+  }
+}
+
+void draw(){
+  background(0);
+  
+  // Start loading animation
+  runLoaderAni();
+  
+  for (int i = 0; i < imgs.length; i++){
+    // Check if individual images are fully loaded
+    if ((imgs[i].width != 0) && (imgs[i].width != -1)){
+      // As images are loaded set true in boolean array
+      loadStates[i] = true;
+    }
+  }
+  // When all images are loaded draw them to the screen
+  if (checkLoadStates()){
+    drawImages();
+  }
+}
+
+void drawImages() {
+  int y = (height - imgs[0].height) / 2;
+  for (int i = 0; i < imgs.length; i++){
+    image(imgs[i], width/imgs.length*i, y, imgs[i].height, imgs[i].height);
+  }
+}
+
+// Loading animation
+void runLoaderAni(){
+  // Only run when images are loading
+  if (!checkLoadStates()){
+    ellipse(loaderX, loaderY, 10, 10);
+    loaderX += 2;
+    loaderY = height/2 + sin(theta) * (height/8);
+    theta += PI/22;
+    // Reposition ellipse if it goes off the screen
+    if (loaderX > width + 5){
+      loaderX = -5;
+    }
+  }
+}
+
+// Return true when all images are loaded - no false values left in array 
+boolean checkLoadStates(){
+  for (int i = 0; i < imgs.length; i++){
+    if (loadStates[i] == false){
+      return false;
+    } 
+  }
+  return true;
+}
+
+
+
+
+
+