Added dynamic/static versions of the particle system example, removed original one

2026-06-16 04:26:26 +02:00 · 2012-01-09 20:21:21 +00:00
parent dcdab48e2a
commit 0529f20716
4 changed files with 263 additions and 14 deletions
@@ -1,98 +0,0 @@
-PShape particles;
-PImage sprite;  
-
-int npartTotal = 1000;
-int npartPerFrame = 10;
-float speed = 1.0;
-float gravity = 0.05;
-float partSize = 20;
-
-int partLifetime;
-PVector velocities[];
-int lifetimes[];  
-
-void setup() {
-  size(640, 480, P3D);
-  frameRate(120);
-
-  particles = createShape(PShape.GROUP);
-  sprite = loadImage("sprite.png");
-
-  for (int n = 0; n < npartTotal; n++) {
-    PShape part = createShape(QUAD);
-    part.noStroke();
-    part.texture(sprite);
-    part.vertex(-partSize/2, -partSize/2, 0, 0);
-    part.vertex(+partSize/2, -partSize/2, sprite.width, 0);
-    part.vertex(+partSize/2, +partSize/2, sprite.width, sprite.height);
-    part.vertex(-partSize/2, +partSize/2, 0, sprite.height);
-    part.end();    
-    particles.addShape(part);
-  }
-
-  partLifetime = npartTotal / npartPerFrame;
-  initVelocities();
-  initLifetimes(); 
-
-  // Writing to the depth buffer is disabled to avoid rendering
-  // artifacts due to the fact that the particles are semi-transparent
-  // but not z-sorted.
-  hint(DISABLE_DEPTH_MASK);
-} 
-
-void draw () {
-  background(0);
-
-  for (int n = 0; n < particles.getChildCount(); n++) {
-    PShape part = particles.getChild(n);
-
-    lifetimes[n]++;
-    if (lifetimes[n] == partLifetime) {
-      lifetimes[n] = 0;
-    }      
-
-    if (0 <= lifetimes[n]) {
-      if (lifetimes[n] == 0) {
-        // Re-spawn dead particle
-        part.center(mouseX, mouseY);
-        float a = random(0, TWO_PI);
-        float s = random(0.5 * speed, 0.5 * speed);
-        velocities[n].x = s * cos(a);
-        velocities[n].y = s * sin(a);
-      } 
-      else {
-        part.translate(velocities[n].x, velocities[n].y);
-        velocities[n].y += gravity;
-      }
-
-      float a = 1.0 - float(lifetimes[n]) / partLifetime;
-      part.fill(255, a * 255);
-    } else {
-      part.fill(0, 0);
-    }
-  }
-
-  shape(particles);
-  
-  if (frameCount % 10 == 0) println(frameRate);
-}
-
-void initVelocities() {
-  velocities = new PVector[npartTotal];
-  for (int n = 0; n < velocities.length; n++) {
-    velocities[n] = new PVector();
-  }
-}
-
-void initLifetimes() {
-  // Initializing particles with negative lifetimes so they are added
-  // progressively into the screen during the first frames of the sketch   
-  lifetimes = new int[npartTotal];
-  int t = -1;
-  for (int n = 0; n < lifetimes.length; n++) {    
-    if (n % npartPerFrame == 0) {
-      t++;
-    }
-    lifetimes[n] = -t;
-  }
-}