<!DOCTYPE html>
<html><head>
<script src="javascript-processing-example-processing.js"></script>
<script src="javascript-processing-example-init.js"></script>
<link rel="stylesheet" href="javascript-processing-example-style.css">
</head><body><h1><a href="http://ejohn.org/blog/processingjs/">Processing.js</a></h1>
<h2>Functions</h2>
<p>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.</p>
<p><a href="http://processing.org/learning/basics/functions.html"><b>Original Processing.org Example:</b> Functions</a><br>
<script type="application/processing">
void setup()
{
size(200, 200);
background(51);
noStroke();
smooth();
noLoop();
}
void draw()
{
draw_target(68, 34, 200, 10);
draw_target(152, 16, 100, 3);
draw_target(100, 144, 80, 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);
}
}
</script><canvas width="200" height="200"></canvas></p>
<div style="overflow: hidden; height: 0px; width: 0px;"></div>
<pre><b>// All Examples Written by <a href="http://reas.com/">Casey Reas</a> and <a href="http://benfry.com/">Ben Fry</a>
// unless otherwise stated.</b>
void setup()
{
size(200, 200);
background(51);
noStroke();
smooth();
noLoop();
}
void draw()
{
draw_target(68, 34, 200, 10);
draw_target(152, 16, 100, 3);
draw_target(100, 144, 80, 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);
}
}</pre>
</body></html>