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<td >Qt 5.9</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-module.html">C++ Classes</a></td><td >QColormap</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#public-types">Public Types</a></li>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#static-public-members">Static Public Members</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QColormap Class</h1>
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<p>The <a href="qcolormap.html">QColormap</a> class maps device independent QColors to device dependent pixel values. <a href="#details">More...</a></p>
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<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign">   <span class="preprocessor">#include &lt;QColormap&gt;</span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += widgets</td></tr></table></div><ul>
<li><a href="qcolormap-members.html">List of all members, including inherited members</a></li>
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<a name="public-types"></a>
<h2 id="public-types">Public Types</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> enum </td><td class="memItemRight bottomAlign"><b><a href="qcolormap.html#Mode-enum">Mode</a></b> { Direct, Indexed, Gray }</td></tr>
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<h2 id="public-functions">Public Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qcolormap.html#QColormap">QColormap</a></b>(const QColormap &amp;<i>colormap</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qcolormap.html#dtor.QColormap">~QColormap</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const QColor </td><td class="memItemRight bottomAlign"><b><a href="qcolormap.html#colorAt">colorAt</a></b>(uint <i>pixel</i>) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const QVector&lt;QColor&gt; </td><td class="memItemRight bottomAlign"><b><a href="qcolormap.html#colormap">colormap</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qcolormap.html#depth">depth</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> Mode </td><td class="memItemRight bottomAlign"><b><a href="qcolormap.html#mode">mode</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> uint </td><td class="memItemRight bottomAlign"><b><a href="qcolormap.html#pixel">pixel</a></b>(const QColor &amp;<i>color</i>) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qcolormap.html#size">size</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QColormap &amp;</td><td class="memItemRight bottomAlign"><b><a href="qcolormap.html#operator-eq">operator=</a></b>(const QColormap &amp;<i>colormap</i>)</td></tr>
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<a name="static-public-members"></a>
<h2 id="static-public-members">Static Public Members</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> QColormap </td><td class="memItemRight bottomAlign"><b><a href="qcolormap.html#instance">instance</a></b>(int <i>screen</i> = -1)</td></tr>
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<h2 id="details">Detailed Description</h2>
<p>The <a href="qcolormap.html">QColormap</a> class maps device independent QColors to device dependent pixel values.</p>
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<div class="types">
<h2>Member Type Documentation</h2>
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<h3 class="fn" id="Mode-enum"><a name="Mode-enum"></a>enum QColormap::<span class="name">Mode</span></h3>
<p>This enum describes how <a href="qcolormap.html">QColormap</a> maps device independent RGB values to device dependent pixel values.</p>
<div class="table"><table class="valuelist"><tr valign="top" class="odd"><th class="tblConst">Constant</th><th class="tblval">Value</th><th class="tbldscr">Description</th></tr>
<tr><td class="topAlign"><code>QColormap::Direct</code></td><td class="topAlign tblval"><code>0</code></td><td class="topAlign">Pixel values are derived directly from the RGB values, also known as &quot;True Color.&quot;</td></tr>
<tr><td class="topAlign"><code>QColormap::Indexed</code></td><td class="topAlign tblval"><code>1</code></td><td class="topAlign">Pixel values represent indexes into a vector of available colors, i.e&#x2e; <a href="qcolormap.html">QColormap</a> uses the index of the color that most closely matches an RGB value.</td></tr>
<tr><td class="topAlign"><code>QColormap::Gray</code></td><td class="topAlign tblval"><code>2</code></td><td class="topAlign">Similar to <code>Indexed</code>, pixel values represent a vector of available gray tones. <a href="qcolormap.html">QColormap</a> uses the index of the gray tone that most closely matches the computed gray tone of an RGB value.</td></tr>
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<h2>Member Function Documentation</h2>
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<h3 class="fn" id="QColormap"><a name="QColormap"></a>QColormap::<span class="name">QColormap</span>(const <span class="type"><a href="qcolormap.html#QColormap">QColormap</a></span> &amp;<i>colormap</i>)</h3>
<p>Constructs a copy of another <i>colormap</i>.</p>
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<h3 class="fn" id="dtor.QColormap"><a name="dtor.QColormap"></a>QColormap::<span class="name">~QColormap</span>()</h3>
<p>Destroys the colormap.</p>
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<h3 class="fn" id="colorAt"><a name="colorAt"></a>const <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> QColormap::<span class="name">colorAt</span>(<span class="type"><a href="../qtcore/qtglobal.html#uint-typedef">uint</a></span> <i>pixel</i>) const</h3>
<p>Returns a <a href="../qtgui/qcolor.html">QColor</a> for the <i>pixel</i>.</p>
<p><b>See also </b><a href="qcolormap.html#pixel">pixel</a>().</p>
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<h3 class="fn" id="colormap"><a name="colormap"></a>const <span class="type"><a href="../qtcore/qvector.html">QVector</a></span>&lt;<span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>&gt; QColormap::<span class="name">colormap</span>() const</h3>
<p>Returns a vector of colors which represents the devices colormap for <code>Indexed</code> and <code>Gray</code> modes. This function returns an empty vector for <code>Direct</code> mode.</p>
<p><b>See also </b><a href="qcolormap.html#size">size</a>().</p>
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<h3 class="fn" id="depth"><a name="depth"></a><span class="type">int</span> QColormap::<span class="name">depth</span>() const</h3>
<p>Returns the depth of the device.</p>
<p><b>See also </b><a href="qcolormap.html#size">size</a>().</p>
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<h3 class="fn" id="instance"><a name="instance"></a><code>[static] </code><span class="type"><a href="qcolormap.html#QColormap">QColormap</a></span> QColormap::<span class="name">instance</span>(<span class="type">int</span> <i>screen</i> = -1)</h3>
<p>Returns the colormap for the specified <i>screen</i>. If <i>screen</i> is -1, this function returns the colormap for the default screen.</p>
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<h3 class="fn" id="mode"><a name="mode"></a><span class="type"><a href="qcolormap.html#Mode-enum">Mode</a></span> QColormap::<span class="name">mode</span>() const</h3>
<p>Returns the mode of this colormap.</p>
<p><b>See also </b><a href="qcolormap.html#Mode-enum">QColormap::Mode</a>.</p>
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<h3 class="fn" id="pixel"><a name="pixel"></a><span class="type"><a href="../qtcore/qtglobal.html#uint-typedef">uint</a></span> QColormap::<span class="name">pixel</span>(const <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> &amp;<i>color</i>) const</h3>
<p>Returns a device dependent pixel value for the <i>color</i>.</p>
<p><b>See also </b><a href="qcolormap.html#colorAt">colorAt</a>().</p>
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<h3 class="fn" id="size"><a name="size"></a><span class="type">int</span> QColormap::<span class="name">size</span>() const</h3>
<p>Returns the size of the colormap for <code>Indexed</code> and <code>Gray</code> modes; Returns -1 for <code>Direct</code> mode.</p>
<p><b>See also </b><a href="qcolormap.html#colormap">colormap</a>().</p>
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<h3 class="fn" id="operator-eq"><a name="operator-eq"></a><span class="type"><a href="qcolormap.html#QColormap">QColormap</a></span> &amp;QColormap::<span class="name">operator=</span>(const <span class="type"><a href="qcolormap.html#QColormap">QColormap</a></span> &amp;<i>colormap</i>)</h3>
<p>Assigns the given <i>colormap</i> to <i>this</i> color map and returns a reference to <i>this</i> color map.</p>
<p>This function was introduced in  Qt 4.2.</p>
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