[ Processing 作品开源 ] aug27_2012_diffractionGrating

[RavenKwok]

http://www.openprocessing.org/sketch/68237

程序代码

//Raven Kwok (aka Guo Ruiwen)
//aug27_2012_diffractionGrating
/*
 
raystain@gmail.com
twitter.com/ravenkwok
flickr.com/ravenkwok
weibo.com/ravenkwok
the-moor.blogbus.com
 
note: The asphalt background of this sketch was taken from Wayne Flower's flickr page "http://www.flickr.com/photos/30675512@N00/3433984140/", though I did a bit awkward modification on it.
 
*/
 
 
PImage bg, fg;
float centerX, centerY;
float trackX, trackY;
 
void setup() {
  size(450, 450, P2D);
 
  centerX = width/2;
  centerY = height/2;
 
  bg = loadImage("cement.jpg");
  fg = createImage(450, 450, RGB);
 
  colorMode(HSB);
  frameRate(30);
  image(bg,0,0);
}
 
void draw() {
 
  trackX = lerp(trackX, mouseX, 0.3);
  trackY = lerp(trackY, mouseY, 0.3);
 
 
  fg.loadPixels();
  for (int i=0;i<height;i++) {
    for (int j=0;j<width;j++) {
 
      float factorSinewave = sin(radians(dist(j, i, centerX, centerY)))*255;
      float factorPerlinnoise = noise((float(j)+float(frameCount)/2)/100, (float(i)+float(frameCount)/2)/100)*255;
      float distanceToMouse = constrain(dist(trackX, trackY, j, i), 1, 1000);
      float factorMouse = 10000/sqrt(distanceToMouse);
 
      float h = factorSinewave*4+factorPerlinnoise*6+factorMouse;
 
      int divider = floor(h/255);
      h -= 255*divider;
      int index = j+i*width;
      if (divider>5) {
        fg.pixels[index] = color(h, 100, 180);
      }
      else {
        fg.pixels[index] = bg.pixels[index];
      }
    }
  }
 
  fg.updatePixels();
   
  tint(255,30);
  image(fg, 0, 0);
   
  tint(255,50);
  image(bg, 0, 0);
}