/** * Request Image * by Ira Greenberg.  * From Processing for Flash Developers, Friends of ED, 2009.  *  * 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, as this example demonstrates.  *  * To work, this example requires 10 images named dublin0.jpg ... dublin9.jpg  * in the sketch data directory. To save space, these images are not included  * with the example. */int imgCount = 10;PImage[] imgs = new PImage[imgCount];float imgW;// Keeps track of loaded images (true or false)boolean[] loadStates = new boolean[imgCount];// For loading animationfloat loaderX, loaderY, theta;void setup() {  size(800, 60);  smooth();  imgW = width/imgCount;  // Load images asynchronously  for (int i = 0; i < imgCount; i++){    imgs[i] = requestImage("dublin"+i+".jpg");  }}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(){  for (int i = 0; i < imgs.length; i++){    image(imgs[i], width/10*i, 0, imgW, height);  }}// Loading animationvoid runLoaderAni(){  // Only run when images are loading  if (!checkLoadStates()){    ellipse(loaderX, loaderY, 10, 10);    loaderX += 2;    loaderY = height/2 + sin(theta) * (height/2.5);    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;}