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pakt03

See /f0blog/pact-februari/

//pakt03
//ok
int index, n;
PGraphics grad;
void setup() {
  size(640, 480, JAVA2D);
  frameRate(60);
  noStroke();
  smooth();
  index= 0;
  n= 50;
  grad= createGraphics(width, height, JAVA2D);
  grad.beginDraw();
  grad.background(0);
  createGradient(grad, width*0.5, height*0.5, width, color(0.7*255.0, 0.6*255.0, 0.5*255.0), color(0, 0, 0));
  grad.endDraw();
}
void draw() {
  float x= width*0.5;
  float y= height*0.5;
  float w= width*0.4;
  float h= height*0.4;
  float spreadx= sin(index*0.005);
  float spready= sin(index*0.011);
  float phaseshift= sin(index*0.001)*TWO_PI;
  float wx= w*(sin(index*0.004)*0.45+0.55);
  float hy= h*(sin(index*0.004)*0.45+0.55);
  image(grad, 0, 0);
  for (int i= 0; i<n; i++) {
    float r= i/float(n)*30.0+1.0;
    float p= 0.0;
    fill(255.0, 255.0, 255.0, 0.5*255.0);
    ellipse(x+(sin((index+(i*spreadx))*0.05+p)*wx), y+cos((index+(i*spready))*0.05+p)*hy, r*2.0, r*2.0);
    p= p+phaseshift;
    fill(0.0, 0.0, 255.0, 0.5*255.0);
    ellipse(x+(sin((index+(i*spreadx))*0.05+p)*wx), y+cos((index+(i*spready))*0.05+p)*hy, r*2.0, r*2.0);
    /*
     p= p+phaseshift;
     fill(0.0, 255.0, 0.0, 0.5*255.0);
     ellipse(x+(sin((index+(i*spreadx))*0.05+p)*wx), y+cos((index+(i*spready))*0.05+p)*hy, r*2.0, r*2.0);
     p= p+phaseshift;
     fill(255.0, 0.0, 0.0, 0.5*255.0);
     ellipse(x+(sin((index+(i*spreadx))*0.05+p)*wx), y+cos((index+(i*spready))*0.05+p)*hy, r*2.0, r*2.0);
     p= p+phaseshift;
     fill(0.0, 0.0, 0.0, 0.5*255.0);
     ellipse(x+(sin((index+(i*spreadx))*0.05+p)*wx), y+cos((index+(i*spready))*0.05+p)*hy, r*2.0, r*2.0);
     */
  }
  index++;
}
//Simple Radial Gradient by Ira Greenberg, modified by /f0
void createGradient (PGraphics ctx, float x, float y, float radius, color c1, color c2) {
  float px = 0, py = 0, angle = 0;
  // calculate differences between color components 
  float deltaR = red(c2)-red(c1);
  float deltaG = green(c2)-green(c1);
  float deltaB = blue(c2)-blue(c1);
  // hack to ensure there are no holes in gradient
  // needs to be increased, as radius increases
  float gapFiller = 8.0;
  for (int i=0; i< radius; i++) {
    for (float j=0; j<360; j+=1.0/gapFiller) {
      px = x+cos(radians(angle))*i;
      py = y+sin(radians(angle))*i;
      angle+=1.0/gapFiller;
      color c = color(
        (red(c1)+(i)*(deltaR/radius)), 
        (green(c1)+(i)*(deltaG/radius)), 
        (blue(c1)+(i)*(deltaB/radius)) 
        );
      //ctx.set(int(px), int(py), c);
      ctx.stroke(c);
      ctx.rect(px, py, 1, 1);
    }
  }
  // adds smooth edge 
  // hack anti-aliasing
  ctx.noFill();
  ctx.strokeWeight(3);
  ctx.ellipse(x, y, radius*2, radius*2);
}