• fullscreen
  • fermat.pde
  • // spiral electron animation, version 2
    // 
    // keep watching! This sketch evolves quite slowly over time :) 
    // The phase shifts gradually, which changes the number of spiral arms 
    // and their direction of rotation.
    //
    // steven kay, June 2010
    
    PFont caption;
    
    void setup() {
      size(512,512,P3D);
      caption=loadFont("ArialMT-48.vlw");
      textFont(caption,16.0);
      //uncomment the following to limit the frame rate
      //frameRate(25);
    }
    
    float factor;
    float factor_change_rate=800000.0;
    float factor_change_rate_2=200000.0;
    
    void draw() {
      background(0);
      //noStroke();
      stroke(0);
      factor=3.0+(3.0*sin(frameCount/factor_change_rate));
      float c=1.2; // size
      ellipseMode(CENTER);
      float x,y;
      for (int n=0;n<800;n++) {
        float off=float(frameCount)/20.0;
        float nn=float(n);
        float r=c*sqrt(nn);
        float theta=off+(nn*degrees(factor));
        x=nn*sin(theta);
        y=nn*cos(theta);  
        float z=nn*sin((((float)frameCount)/factor_change_rate_2)*theta);
        float luma=255-(nn/c);
        if (n%1==0) {
        pushMatrix();
        translate(256,256);
        translate(x,y,z);
        fill(luma,0,255-luma);
        float sz=30-(n/10);
        ellipse(0,0,sz,sz);
        popMatrix();
        }
        
      } 
      //optional - show value of factor
      //fill(0);
      //text(""+factor,1,501);
      //fill(255);
      //text(""+factor,0,500);
    }
    

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    about this sketch

    This sketch is running as Java applet, exported from Processing.

    license

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    Steven Kay

    Galaxy Spirals

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    watch the spirals evolve and mutate slowly over time

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