Perlin Noise demo with Processing

#copyright @ http://scriptdemo.blogspot.com // inspired by the Perlin Noise Particle System from Daan van Hasselt (http://www.openprocessing.org/visuals/?visualID=10475) // I recoded it with more additional features. Also it may be easier to understand without the class. // Online test  from my dropbox (my Dropbox reference link) float myw=400.0; float myh=350.0; float x, y; float u=0; float v=0; float x0, y0, dx, dy; float coefx, coefy, coefz; boolean isAlive=false; boolean isColor=true; boolean isSmooth=true; boolean isLoop=true; int NumP=400; float Npi; void setup() {   Npi=2.3; coefx=0.009; coefy=0.011; coefz=0.0013;   size(floor(myw),floor(myh));   background(255,255,255);   if (isSmooth) smooth(); } void draw() {   for (int n=0; n<=NumP; n++)   {       if (isAlive)       {         float nv=noise(x*coefx,y*coefy,frameCount*coefz);         if (isColor)         {            float mysin=sin((nv-0.3)*TWO_PI*Npi);            float mycos=cos((nv-0.3)*TWO_PI*Npi);            if (mycos>=0 & mysin >=0) fill(floor(abs(mysin)*255),floor(abs(mycos)*255),0,10);            if (mycos>=0 & mysin <0) fill(floor(abs(mysin)*255),0,floor(abs(mycos)*255),10);            if (mycos<0 & mysin >=0) fill(0,floor(abs(mycos)*255),floor(abs(mysin)*255),10);            if (mycos<0 & mysin <0) fill(floor(abs(mysin)*255),floor(abs(mycos)*255),0,10);         } else {            fill(10,10);         }          u=u+cos((nv-0.3)*TWO_PI*Npi);          v=v+sin((nv-0.3)*TWO_PI*Npi);          u=u/2;          v=v/2;          x=x+u;          y=y+v;       } else {         x0=0.5*myw;         y0=0.5*myh;         x=x0; y=y0;         dx=100*frameCount/2000+50;         dy=dx;         isAlive=true;       }       noStroke();       ellipse(x,y,1,1);   }   if (x>width || y> height || x <0 || y< 0) isAlive=false; } void mouseClicked() {   isLoop=!isLoop;   if (!isLoop)   {      noLoop();   } else {      loop();   } }

Here are some demo videos: