a port of the Processing Visualization Language


Move the cursor over the image to draw with a software tool which responds to the speed of the mouse.

Original Processing.org Example: Pattern

// All Examples Written by Casey Reas and Ben Fry

// unless otherwise stated.

void setup()


  size(200, 200);




void draw() 


  // Call the variableEllipse() method and send it the

  // parameters for the current mouse position

  // and the previous mouse position

  variableEllipse(mouseX, mouseY, pmouseX, pmouseY);


// The simple method variableEllipse() was created specifically 

// for this program. It calculates the speed of the mouse

// and draws a small ellipse if the mouse is moving slowly

// and draws a large ellipse if the mouse is moving quickly 

void variableEllipse(int x, int y, int px, int py) 


  float speed = abs(x-px) + abs(y-py);


  ellipse(x, y, speed, speed);

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