mirror of
https://github.com/processing/processing4.git
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87 lines
1.3 KiB
XML
87 lines
1.3 KiB
XML
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
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<root>
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<name>key</name>
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<category>Input/Output</category>
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<subcategory>Keyboard</subcategory>
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<usage>Web & Application</usage>
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<example>
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<image>key.jar</image>
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<code>
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// Click on the window to give it focus
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// and press the 'B' key
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void loop() {
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if(keyPressed) {
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if (key == 'b' || key == 'B') {
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fill(0);
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}
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} else {
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fill(255);
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}
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rect(25, 25, 50, 50);
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}
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</code>
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</example>
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<example>
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<image>key2.jar</image>
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<code>
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// Click on the window to give it focus
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// and press the up and down arrow keys
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void loop() {
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if(keyPressed) {
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if (key == UP) {
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fill(255);
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} else if (key == DOWN) {
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fill(0);
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}
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} else {
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fill(126);
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}
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rect(25, 25, 50, 50);
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}
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</code>
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</example>
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<description>
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The system variable <b>key</b> always contains the value of the most recently pressed key on the keyboard. For detecting the arrow keys, the <b>key</b> variable is set to either UP, DOWN, LEFT, or RIGHT. Other special key constants are ALT, CONTROL, and SHIFT.
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</description>
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<syntax>
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key
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</syntax>
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<parameter>
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<label></label>
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<description></description>
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</parameter>
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<returns></returns>
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<related>
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keyPressed
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keyCode
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keyPressed()
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keyReleased()
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</related>
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<availability>1.0</availability>
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<type>System variable</type>
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<partof>Core</partof>
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</root>
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