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Examples for Processing (BETA) version 91+. If you have a previous version, use the examples included with your software. If you see any errors or have comments, please let us know.

Functions
by REAS <http://reas.com>

The draw_target() function makes it easy to draw many distinct targets. Each call to draw_target() specifies the position, size, and number of rings for each target.

Updated 21 August 2002

    
// Functions 
// by REAS <http://reas.com> 

void setup() 
{ 
  size(200, 200); 
  background(51); 
  noStroke(); 
  ellipseMode(CENTER_RADIUS); 
  noLoop(); 
} 
 
void draw() 
{ 
  draw_target(68, 34, 100, 10); 
  draw_target(152, 16, 50, 3); 
  draw_target(100, 144, 40, 5); 
} 
 
void draw_target(int xloc, int yloc, int size, int num) 
{ 
  float grayvalues = 255/num; 
  float steps = size/num; 
  for(int i=0; i<num; i++) { 
    fill(i*grayvalues); 
    ellipse(xloc, yloc, size-i*steps, size-i*steps); 
  } 
}
 







    
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