Request Image
/**
* Request Image
* by Ira Greenberg. Translated to ProcessingGL C++.
*
* requestImage() loads images on a background thread so the sketch
* doesn't freeze. While loading, a bouncing ellipse plays.
* Width == 0: still loading. Width == -1: load failed.
*/
int imgCount = 12;
PImage* imgs[12];
float imgW;
bool loadStates[12];
float loaderX, loaderY, theta;
bool checkLoadStates() {
for (int i = 0; i < imgCount; i++) {
if (!loadStates[i]) return false;
}
return true;
}
void drawImages() {
int y = (height - imgs[0]->height) / 2;
for (int i = 0; i < imgCount; i++) {
image(imgs[i], width / imgCount * i, y,
imgs[i]->height, imgs[i]->height);
}
}
void runLoaderAni() {
if (!checkLoadStates()) {
ellipse(loaderX, loaderY, 10, 10);
loaderX += 2;
loaderY = height/2 + sin(theta) * (height/8);
theta += PI / 22;
if (loaderX > width + 5) loaderX = -5;
}
}
void setup() {
size(640, 360);
imgW = width / imgCount;
for (int i = 0; i < imgCount; i++) {
loadStates[i] = false;
imgs[i] = requestImage("PT_anim" + nf(i, 4) + ".gif");
}
}
void draw() {
background(0);
runLoaderAni();
for (int i = 0; i < imgCount; i++) {
if (imgs[i] != nullptr &&
imgs[i]->width != 0 &&
imgs[i]->width != -1) {
loadStates[i] = true;
}
}
if (checkLoadStates()) {
drawImages();
}
}