/usr/share/qt5/doc/qtgraphicaleffects/qml-qtgraphicaleffects-glow.html is in qtgraphicaleffects5-doc-html 5.2.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 | <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en_US" lang="en_US">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!-- Glow.qml -->
<title>Glow | QtGraphicalEffects 5.2</title>
<link rel="stylesheet" type="text/css" href="style/offline.css" />
</head>
<body>
<div class="header" id="qtdocheader">
<div class="main">
<div class="main-rounded">
<div class="navigationbar">
<ul>
<li>Qt 5.2</li>
<li><a href="qtgraphicaleffects-index.html">Qt Graphical Effects</a></li>
<li><a href="graphicaleffects.html">QML Types</a></li>
<li>Glow</li>
<li id="buildversion">
Qt 5.2.1 Reference Documentation</li>
</ul>
</div>
</div>
<div class="content">
<div class="line">
<div class="content mainContent">
<div class="toc">
<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#properties">Properties</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
<li class="level2"><a href="#example">Example</a></li>
</ul>
</div>
<h1 class="title">Glow</h1>
<span class="subtitle"></span>
<!-- $$$Glow-brief -->
<p>Generates a blurred and colorized image of the source and places it behind the original, giving impression that the source is glowing. <a href="#details">More...</a></p>
<!-- @@@Glow -->
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> </b><tt>import QtGraphicalEffects 1.0</tt></td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> QtGraphicalEffects 1.0</td></tr></table><ul>
<li><a href="qml-qtgraphicaleffects-glow-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="properties"></a>
<h2>Properties</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-glow.html#cached-prop">cached</a></b></b> : bool</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-glow.html#color-prop">color</a></b></b> : color</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-glow.html#fast-prop">fast</a></b></b> : bool</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-glow.html#radius-prop">radius</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-glow.html#samples-prop">samples</a></b></b> : int</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-glow.html#source-prop">source</a></b></b> : variant</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-glow.html#spread-prop">spread</a></b></b> : real</li>
<li class="fn"><b><b><a href="qml-qtgraphicaleffects-glow.html#transparentBorder-prop">transparentBorder</a></b></b> : bool</li>
</ul>
<!-- $$$Glow-description -->
<a name="details"></a>
<h2>Detailed Description</h2>
<p>By default effect produces a high quality glow image, thus the rendering speed of the effect may not be the highest possible. The rendering speed is reduced especially if the glow edges are heavily softened. For use cases that require faster rendering speed and the highest possible visual quality is not necessary, property <a href="qml-qtgraphicaleffects-glow.html#fast-prop">fast</a> can be set to true.</p>
<table class="generic">
<thead><tr class="qt-style"><th >Source</th><th >Effect applied</th></tr></thead>
<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/Original_butterfly_black.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/Glow_butterfly.png" alt="" /></p></td></tr>
</table>
<a name="example"></a>
<h2>Example</h2>
<p>The following example shows how to apply the effect.</p>
<pre class="qml">import QtQuick 2.0
import QtGraphicalEffects 1.0
<span class="type">Item</span> {
<span class="name">width</span>: <span class="number">300</span>
<span class="name">height</span>: <span class="number">300</span>
<span class="type">Rectangle</span> {
<span class="name">anchors</span>.fill: <span class="name">parent</span>
<span class="name">color</span>: <span class="string">"black"</span>
}
<span class="type">Image</span> {
<span class="name">id</span>: <span class="name">butterfly</span>
<span class="name">source</span>: <span class="string">"images/butterfly.png"</span>
<span class="name">sourceSize</span>: <span class="name">Qt</span>.<span class="name">size</span>(<span class="name">parent</span>.<span class="name">width</span>, <span class="name">parent</span>.<span class="name">height</span>)
<span class="name">smooth</span>: <span class="number">true</span>
<span class="name">visible</span>: <span class="number">false</span>
}
<span class="type">Glow</span> {
<span class="name">anchors</span>.fill: <span class="name">butterfly</span>
<span class="name">radius</span>: <span class="number">8</span>
<span class="name">samples</span>: <span class="number">16</span>
<span class="name">color</span>: <span class="string">"white"</span>
<span class="name">source</span>: <span class="name">butterfly</span>
}
}</pre>
<!-- @@@Glow -->
<h2>Property Documentation</h2>
<!-- $$$cached -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="cached-prop"></a><span class="name">cached</span> : <span class="type">bool</span></p></td></tr></table></div><div class="qmldoc"><p>This property allows the effect output pixels to be cached in order to improve the rendering performance.</p>
<p>Every time the source or effect properties are changed, the pixels in the cache must be updated. Memory consumption is increased, because an extra buffer of memory is required for storing the effect output.</p>
<p>It is recommended to disable the cache when the source or the effect properties are animated.</p>
<p>By default, the property is set to <tt>false</tt>.</p>
</div></div><!-- @@@cached -->
<br/>
<!-- $$$color -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="color-prop"></a><span class="name">color</span> : <span class="type">color</span></p></td></tr></table></div><div class="qmldoc"><p>This property defines the RGBA color value which is used for the glow.</p>
<p>By default, the property is set to <tt>"white"</tt>.</p>
<table class="generic">
<thead><tr class="qt-style"><th >Output examples with different color values</th><th ></th><th ></th></tr></thead>
<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/Glow_color1.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/Glow_color2.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/Glow_color3.png" alt="" /></p></td></tr>
<tr valign="top" class="even"><td ><b> color: #ffffff </b></td><td ><b> color: #00ff00 </b></td><td ><b> color: #aa00ff00 </b></td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-glow.html#radius-prop">radius</a>: 8</td><td ><a href="qml-qtgraphicaleffects-glow.html#radius-prop">radius</a>: 8</td><td ><a href="qml-qtgraphicaleffects-glow.html#radius-prop">radius</a>: 8</td></tr>
<tr valign="top" class="even"><td ><a href="qml-qtgraphicaleffects-glow.html#samples-prop">samples</a>: 16</td><td ><a href="qml-qtgraphicaleffects-glow.html#samples-prop">samples</a>: 16</td><td ><a href="qml-qtgraphicaleffects-glow.html#samples-prop">samples</a>: 16</td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-glow.html#spread-prop">spread</a>: 0.5</td><td ><a href="qml-qtgraphicaleffects-glow.html#spread-prop">spread</a>: 0.5</td><td ><a href="qml-qtgraphicaleffects-glow.html#spread-prop">spread</a>: 0.5</td></tr>
</table>
</div></div><!-- @@@color -->
<br/>
<!-- $$$fast -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="fast-prop"></a><span class="name">fast</span> : <span class="type">bool</span></p></td></tr></table></div><div class="qmldoc"><p>This property selects the blurring algorithm that is used to produce the softness for the effect. Setting this to true enables fast algorithm, setting value to false produces higher quality result.</p>
<p>By default, the property is set to <tt>false</tt>.</p>
<table class="generic">
<thead><tr class="qt-style"><th >Output examples with different fast values</th><th ></th><th ></th></tr></thead>
<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/Glow_fast1.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/Glow_fast2.png" alt="" /></p></td></tr>
<tr valign="top" class="even"><td ><b> fast: false </b></td><td ><b> fast: true </b></td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-glow.html#radius-prop">radius</a>: 16</td><td ><a href="qml-qtgraphicaleffects-glow.html#radius-prop">radius</a>: 16</td></tr>
<tr valign="top" class="even"><td ><a href="qml-qtgraphicaleffects-glow.html#samples-prop">samples</a>: 24</td><td ><a href="qml-qtgraphicaleffects-glow.html#samples-prop">samples</a>: 24</td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-glow.html#color-prop">color</a>: #ffffff</td><td ><a href="qml-qtgraphicaleffects-glow.html#color-prop">color</a>: #ffffff</td></tr>
<tr valign="top" class="even"><td ><a href="qml-qtgraphicaleffects-glow.html#spread-prop">spread</a>: 0.3</td><td ><a href="qml-qtgraphicaleffects-glow.html#spread-prop">spread</a>: 0.3</td></tr>
</table>
</div></div><!-- @@@fast -->
<br/>
<!-- $$$radius -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="radius-prop"></a><span class="name">radius</span> : <span class="type">real</span></p></td></tr></table></div><div class="qmldoc"><p>Radius defines the softness of the glow. A larger radius causes the edges of the glow to appear more blurry.</p>
<p>Depending on the radius value, value of the <a href="qml-qtgraphicaleffects-glow.html#samples-prop">samples</a> should be set to sufficiently large to ensure the visual quality.</p>
<p>The value ranges from 0.0 (no blur) to inf. By default, the property is set to <tt>0.0</tt> (no blur).</p>
<table class="generic">
<thead><tr class="qt-style"><th >Output examples with different radius values</th><th ></th><th ></th></tr></thead>
<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/Glow_radius1.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/Glow_radius2.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/Glow_radius3.png" alt="" /></p></td></tr>
<tr valign="top" class="even"><td ><b> radius: 0 </b></td><td ><b> radius: 6 </b></td><td ><b> radius: 12 </b></td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-glow.html#samples-prop">samples</a>: 24</td><td ><a href="qml-qtgraphicaleffects-glow.html#samples-prop">samples</a>: 24</td><td ><a href="qml-qtgraphicaleffects-glow.html#samples-prop">samples</a>: 24</td></tr>
<tr valign="top" class="even"><td ><a href="qml-qtgraphicaleffects-glow.html#color-prop">color</a>: #ffffff</td><td ><a href="qml-qtgraphicaleffects-glow.html#color-prop">color</a>: #ffffff</td><td ><a href="qml-qtgraphicaleffects-glow.html#color-prop">color</a>: #ffffff</td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-glow.html#spread-prop">spread</a>: 0</td><td ><a href="qml-qtgraphicaleffects-glow.html#spread-prop">spread</a>: 0</td><td ><a href="qml-qtgraphicaleffects-glow.html#spread-prop">spread</a>: 0</td></tr>
</table>
</div></div><!-- @@@radius -->
<br/>
<!-- $$$samples -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="samples-prop"></a><span class="name">samples</span> : <span class="type">int</span></p></td></tr></table></div><div class="qmldoc"><p>This property defines how many samples are taken per pixel when edge softening blur calculation is done. Larger value produces better quality, but is slower to render.</p>
<p>Ideally, this value should be twice as large as the highest required radius value, for example, if the radius is animated between 0.0 and 4.0, samples should be set to 8.</p>
<p>The value ranges from 0 to 32. By default, the property is set to <tt>0</tt>.</p>
<p>This property is not intended to be animated. Changing this property may cause the underlying OpenGL shaders to be recompiled.</p>
<p>When <a href="qml-qtgraphicaleffects-glow.html#fast-prop">fast</a> property is set to true, this property has no effect.</p>
</div></div><!-- @@@samples -->
<br/>
<!-- $$$source -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="source-prop"></a><span class="name">source</span> : <span class="type">variant</span></p></td></tr></table></div><div class="qmldoc"><p>This property defines the source item that is going to be used as source for the generated glow.</p>
<p><b>Note: </b>It is not supported to let the effect include itself, for instance by setting source to the effect's parent.</p></div></div><!-- @@@source -->
<br/>
<!-- $$$spread -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="spread-prop"></a><span class="name">spread</span> : <span class="type">real</span></p></td></tr></table></div><div class="qmldoc"><p>This property defines how large part of the glow color is strenghtened near the source edges.</p>
<p>The values range from 0.0 to 1.0. By default, the property is set to <tt>0.5</tt>.</p>
<table class="generic">
<thead><tr class="qt-style"><th >Output examples with different spread values</th><th ></th><th ></th></tr></thead>
<tr valign="top" class="odd"><td ><p class="centerAlign"><img src="images/Glow_spread1.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/Glow_spread2.png" alt="" /></p></td><td ><p class="centerAlign"><img src="images/Glow_spread3.png" alt="" /></p></td></tr>
<tr valign="top" class="even"><td ><b> spread: 0.0 </b></td><td ><b> spread: 0.5 </b></td><td ><b> spread: 1.0 </b></td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-glow.html#radius-prop">radius</a>: 8</td><td ><a href="qml-qtgraphicaleffects-glow.html#radius-prop">radius</a>: 8</td><td ><a href="qml-qtgraphicaleffects-glow.html#radius-prop">radius</a>: 8</td></tr>
<tr valign="top" class="even"><td ><a href="qml-qtgraphicaleffects-glow.html#samples-prop">samples</a>: 16</td><td ><a href="qml-qtgraphicaleffects-glow.html#samples-prop">samples</a>: 16</td><td ><a href="qml-qtgraphicaleffects-glow.html#samples-prop">samples</a>: 16</td></tr>
<tr valign="top" class="odd"><td ><a href="qml-qtgraphicaleffects-glow.html#color-prop">color</a>: #ffffff</td><td ><a href="qml-qtgraphicaleffects-glow.html#color-prop">color</a>: #ffffff</td><td ><a href="qml-qtgraphicaleffects-glow.html#color-prop">color</a>: #ffffff</td></tr>
</table>
</div></div><!-- @@@spread -->
<br/>
<!-- $$$transparentBorder -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="transparentBorder-prop"></a><span class="name">transparentBorder</span> : <span class="type">bool</span></p></td></tr></table></div><div class="qmldoc"></div></div><!-- @@@transparentBorder -->
<br/>
</div>
</div>
</div>
</div>
</div>
<div class="footer">
<p>
<acronym title="Copyright">©</acronym> 2013 Digia Plc and/or its
subsidiaries. Documentation contributions included herein are the copyrights of
their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Digia, Qt and their respective logos are trademarks of Digia Plc in Finland and/or other countries worldwide. All other trademarks are property
of their respective owners. </p>
</div>
</body>
</html>
|