199 lines
8.5 KiB
Plaintext
199 lines
8.5 KiB
Plaintext
<!DOCTYPE html>
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<title>get() | reference | Processing.js</title>
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<span class="tagline">a port of the Processing Visualization Language</span>
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<div class="span11">
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<table cellpadding="0" cellspacing="0" border="0" class="ref-item">
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<tr>
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<th scope="row">Class</th>
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<td>PImage</td>
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</tr>
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<tr class="name-row">
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<th scope="row">Name</th>
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<td><h3>get()</h3></td>
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</tr>
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<tr class="">
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<th scope="row">Examples</th>
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<td><div class="example"><img src="PImage_get.jpg" alt="example pic" /><pre class="margin">// @pjs preload must be used to preload the image
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/* @pjs preload="tower.jpg"; */
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PImage img = loadImage("tower.jpg");
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background(img);
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noStroke();
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color c = img.get(60, 90);
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fill(c);
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rect(25, 25, 50, 50);</pre></div>
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<div class="example"><img src="PImage_get2.jpg" alt="example pic" /><pre class="margin">// @pjs preload must be used to preload the image
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/* @pjs preload="tower.jpg"; */
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PImage img = loadImage("tower.jpg");
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background(img);
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PImage b = img.get(50, 0, 50, 100);
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image(b, 0, 0);</pre></div></td>
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</tr>
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<tr class="">
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<th scope="row">Description</th>
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<td><p>Reads the color of any pixel or grabs a group of pixels. If no parameters are specified, the entire image is returned. Get the value of one pixel by
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specifying an x,y coordinate. Get a section of the display window by specifing an additional <b>width</b> and <b>height</b> parameter.
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If the pixel requested is outside of the image window, black is returned. The numbers returned are scaled according to the current color ranges,
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but only RGB values are returned by this function. Even though you may have drawn a shape with <b>colorMode(HSB)</b>, the numbers returned will be in RGB. </p>
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<p>Getting the color of a single pixel with <b>get(x, y)</b> is easy, but not as fast as grabbing the data directly from <b>pixels[]</b>.
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The equivalent statement to "get(x, y)" using <b>pixels[]</b> is "pixels[y*width+x]". Processing requires calling <b>loadPixels()</b> to load the display window data into
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the <b>pixels[]</b> array before getting the values. </p>
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<p>This function ignores <b>imageMode()</b>.</p></td>
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</tr>
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<tr class="">
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<th scope="row">Syntax</th>
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<td><pre><kbd>img</kbd>.get()</pre><br />
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<pre><kbd>img</kbd>.get(<kbd>x</kbd>,<kbd>y</kbd>)</pre><br />
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<pre><kbd>img</kbd>.get(<kbd>x</kbd>,<kbd>y</kbd>,<kbd>width</kbd>,<kbd>height</kbd>)</pre><br /></td>
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</tr>
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<tr class="">
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<th scope="row">Parameters</th>
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<td>
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<table cellpadding="0" cellspacing="0" border="0">
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<tr class="">
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<th scope="row">img</th>
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<td>PImage: any variable of type PImage</td>
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</tr>
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<tr class="">
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<th scope="row">x</th>
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<td>int: x-coordinate of the pixel</td>
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</tr>
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<tr class="">
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<th scope="row">y</th>
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<td>int: y-coordinate of the pixel</td>
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</tr>
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<tr class="">
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<th scope="row">width</th>
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<td>int: width of pixel rectangle to get</td>
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</tr>
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<tr class="">
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<th scope="row">height</th>
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<td>int: height of pixel rectangle to get</td>
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</tr>
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</table>
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</td>
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</tr>
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<tr class="">
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<th scope="row">Returns</th>
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<td>color or PImage</td>
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</tr>
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<tr class="">
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<th scope="row">Usage</th>
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<td>Web & Application</td>
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</tr>
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<tr class="">
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<th scope="row">Related</th>
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<td><a href="set_.1">set()</a><br />
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<a href="pixels_.1">pixels[]</a><br />
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<a href="copy_.1">copy()</a></td>
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</tr>
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</table>
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<div class="cclicense">
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<p>This reference is licensed under the CC BY-NC-SA 2.0 license:</p>
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<h3><a href="http://processingjs.org/download/">Downloads</a></h3>
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<li><a href="http://processingjs.org/articles/jsQuickStart.html">Quick Start - JavaScript Developer</a></li>
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Processing is an open visualization language developed by
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<a href="http://benfry.com/">Ben Fry</a> & <a href="http://reas.com/">Casey Reas</a>,
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and originally ported to Javascript by
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<a href="http://ejohn.org/blog/processingjs/">John Resig</a>.
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