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<!DOCTYPE html>
<html>
<head>
<script src="../../processing.js"></script>
<link rel="stylesheet" href="../style.css"/></head>
<body><h1><a href="http://ejohn.org/blog/processingjs/">Processing.js</a></h1>
<h2>RadialGradient</h2>
<p>by Ira Greenberg.
Using the convenient red(), green()
and blue() component functions,
generate an array of radial gradients.</p>
<p><a href="http://processing.org/learning/basics/radialgradient.html"><b>Original Processing.org Example:</b> RadialGradient</a><br>
<script type="application/processing">
void setup(){
size(50, 50);
background(0);
smooth();
// create a simple table of gradients
int columns = 1;
//int radius = (width/columns)/2;
int radius = width/2;
// create some gradients
for (int i=radius; i< width; i+=radius*2){
for (int j =radius; j< height; j+=radius*2){
createGradient(i, j, radius,
color(int(random(255)), int(random(255)), int(random(255))),
color(int(random(255)), int(random(255)), int(random(255))));
}
}
}
void createGradient (float x, float y, float radius, color c1, color c2){
float px = 0, py = 0, angle = 0;
// calculate differences between color components
float deltaR = red(c2)-red(c1);
float deltaG = green(c2)-green(c1);
float deltaB = blue(c2)-blue(c1);
// hack to ensure there are no holes in gradient
// needs to be increased, as radius increases
float gapFiller = 8.0;
for (int i=0; i< radius; i++){
for (float j=0; j<360; j+=1.0/gapFiller){
px = x+cos(radians(angle))*i;
py = y+sin(radians(angle))*i;
angle+=1.0/gapFiller;
color c = color(
(red(c1)+(i)*(deltaR/radius)),
(green(c1)+(i)*(deltaG/radius)),
(blue(c1)+(i)*(deltaB/radius))
);
set(int(px), int(py), c);
}
}
// adds smooth edge
// hack anti-aliasing
noFill();
strokeWeight(3);
ellipse(x, y, radius*2, radius*2);
}
</script><canvas width="200" height="200"></canvas></p>
<div style="height:0px;width:0px;overflow:hidden;"></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(0);
smooth();
// create a simple table of gradients
int columns = 4;
int radius = (width/columns)/2;
// create some gradients
for (int i=radius; i< width; i+=radius*2){
for (int j =radius; j< height; j+=radius*2){
createGradient(i, j, radius,
color(int(random(255)), int(random(255)), int(random(255))),
color(int(random(255)), int(random(255)), int(random(255))));
}
}
}
void createGradient (float x, float y, float radius, color c1, color c2){
float px = 0, py = 0, angle = 0;
// calculate differences between color components
float deltaR = red(c2)-red(c1);
float deltaG = green(c2)-green(c1);
float deltaB = blue(c2)-blue(c1);
// hack to ensure there are no holes in gradient
// needs to be increased, as radius increases
float gapFiller = 8.0;
for (int i=0; i< radius; i++){
for (float j=0; j<360; j+=1.0/gapFiller){
px = x+cos(radians(angle))*i;
py = y+sin(radians(angle))*i;
angle+=1.0/gapFiller;
color c = color(
(red(c1)+(i)*(deltaR/radius)),
(green(c1)+(i)*(deltaG/radius)),
(blue(c1)+(i)*(deltaB/radius))
);
set(int(px), int(py), c);
}
}
// adds smooth edge
// hack anti-aliasing
noFill();
strokeWeight(3);
ellipse(x, y, radius*2, radius*2);
}</pre>
</body>
</html>