280 lines
8.9 KiB
HTML
280 lines
8.9 KiB
HTML
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<title>loadImage() | reference | Processing.js</title>
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<a href="http://processingjs.org/"><img src="../../images/header.png" width="177" height="42"></a>
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</div>
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<span class="tagline">a port of the Processing Visualization Language</span>
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<canvas width="940px" height="78px" data-processing-sources="/sketches/bannerSketch.pde"></canvas>
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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 class="name-row">
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<th scope="row">Name</th>
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<td><h3>loadImage()</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="../loadImage_.jpg" alt="example pic" /><pre class="margin">
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// @pjs preload must be used to preload the image
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/* @pjs preload="laDefense.jpg"; */
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PImage b;
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b = loadImage("laDefense.jpg");
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image(b, 0, 0);
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</pre></div><div class="example"><img src="../loadImage_.jpg" alt="example pic" /><pre class="margin">
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// @pjs preload must be used to preload the image
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/* @pjs preload="laDefense.jpg"; */
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PImage b;
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void setup() {
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b = loadImage("laDefense.jpg");
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noLoop();
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}
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void draw() {
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image(b, 0, 0);
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}</pre></div><div class="example"><pre>PImage online;
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void setup() {
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String url = "http://mt0.google.com/mt?n=404&v=w2.61&x=9913&y=12119&zoom=2";
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online = loadImage(url, "png");
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noLoop();
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}
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void draw() {
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image(b, 0, 0);
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}</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>Loads an image into a variable of type <b>PImage</b>. Four types of images ( <b>.gif</b>, <b>.jpg</b>, <b>.tga</b>, <b>.png</b>) images may be loaded. To load correctly, <strike>images must be located in the data directory of the current sketch</strike>, the images must be preloaded using @pjs preload specifying the path to the image. In most cases, load all images in <b>setup()</b> to preload them at the start of the program. Loading images inside <b>draw()</b> will reduce the speed of a program. You can also load images from a data URI, such as "data:image/jpg;base64,{base 64 encoded data block}" which does not require any preloading.
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<br /><br />
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The filename parameter can also be a URL to a file found online. For security reasons, a Processing sketch found online can only download files from the same server from which it came.
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<br /><br />
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The extension of the filename parameter is used to determine the image type. In cases where the image filename does not end with a proper extension, specify the extension as the second parameter to loadImage(), as shown in the third example on this page.
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<br /><br />
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If an image is not loaded successfully, the <b>null</b> value is returned and an error message will be printed to the console. The error message does not halt the program, however the null value may cause a NullPointerException if your code does not check whether the value returned from loadImage() is null.
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<br /><br />
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<b>NOTE: </b>Some browers will not allow you to load images from file:// URIs. It is recommended that you use a webserver for your development and testing to avoid any problems with file:// URIs.</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>loadImage(<kbd>filename</kbd>)</pre></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><table cellpadding="0" cellspacing="0" border="0">
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<tr class="">
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<th scope="row">filename</th>
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<td>string: name of file to load or data URI/td>
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</tr>
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</table></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="../PImage.1">PImage </a>
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<br /><a href="../image_.1">image() </a>
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<br /><a href="../imageMode_.1">imageMode() </a>
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<br /><a href="../background_.1">background()</a><br /></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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<h3><a href="http://processingjs.org/articles/">Articles</a></h3>
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<h3><a>Web IDEs</a></h3>
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<ul>
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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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Processing.js is maintained by the Processing.js team.
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