<!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>Keyboard</h2>
<p>Click on the image to give it focus and press the letter keys
to create forms in time and space. Each key has a unique identifying
number called it's ASCII value. These numbers can be used to position
shapes in space.</p>
<p><a href="http://processing.org/learning/basics/keyboard.html"><b>Original Processing.org Example:</b> Keyboard</a><br>
<script type="application/processing">
int numChars = 26;
color[] colors = new color[numChars];
int keyIndex;
float keyScale;
int rectWidth;
void setup()
{
size(200, 200);
noStroke();
background(0);
keyScale = 200/numChars-1.0;
rectWidth = width/4;
}
void draw()
{
if(keyPressed) {
if(key >= 'A' && key <= 'z') {
if(key <= 'Z') {
keyIndex = key-'A';
} else {
keyIndex = key-'a';
}
fill(millis()%255);
float beginRect = rectWidth/2 + keyIndex*keyScale-rectWidth/2;
rect(beginRect, 0.0, rectWidth, height);
}
}
}
</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>
int numChars = 26;
color[] colors = new color[numChars];
int keyIndex;
float keyScale;
int rectWidth;
void setup()
{
size(200, 200);
noStroke();
background(0);
keyScale = 200/numChars-1.0;
rectWidth = width/4;
}
void draw()
{
if(keyPressed) {
if(key >= 'A' && key <= 'z') {
if(key <= 'Z') {
keyIndex = key-'A';
} else {
keyIndex = key-'a';
}
fill(millis()%255);
float beginRect = rectWidth/2 + keyIndex*keyScale-rectWidth/2;
rect(beginRect, 0.0, rectWidth, height);
}
}
}</pre>
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