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<h1 class="title">context2d.h Example File</h1>
<span class="subtitle">script/context2d/context2d.h</span>
<!-- $$$script/context2d/context2d.h-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#ifndef CONTEXT2D_H</span>
<span class="preprocessor">#define CONTEXT2D_H</span>
<span class="preprocessor">#include "domimage.h"</span>
<span class="preprocessor">#include <QPainter></span>
<span class="preprocessor">#include <QPainterPath></span>
<span class="preprocessor">#include <QString></span>
<span class="preprocessor">#include <QStack></span>
<span class="preprocessor">#include <QMetaType></span>
<span class="preprocessor">#include <QTimerEvent></span>
<span class="comment">// [3]</span>
<span class="keyword">class</span> CanvasGradient
{
<span class="keyword">public</span>:
CanvasGradient(<span class="keyword">const</span> <span class="type">QGradient</span> <span class="operator">&</span>v)
: value(v) {}
CanvasGradient() {}
<span class="type">QGradient</span> value;
};
<span class="comment">// [3]</span>
Q_DECLARE_METATYPE(CanvasGradient)
Q_DECLARE_METATYPE(CanvasGradient<span class="operator">*</span>)
<span class="keyword">class</span> ImageData {
};
<span class="keyword">class</span> QContext2DCanvas;
<span class="keyword">class</span> Context2D : <span class="keyword">public</span> <span class="type">QObject</span>
{
Q_OBJECT
<span class="comment">// compositing</span>
Q_PROPERTY(<span class="type">qreal</span> globalAlpha READ globalAlpha WRITE setGlobalAlpha)
Q_PROPERTY(<span class="type">QString</span> globalCompositeOperation READ globalCompositeOperation WRITE setGlobalCompositeOperation)
Q_PROPERTY(<span class="type">QVariant</span> strokeStyle READ strokeStyle WRITE setStrokeStyle)
Q_PROPERTY(<span class="type">QVariant</span> fillStyle READ fillStyle WRITE setFillStyle)
<span class="comment">// line caps/joins</span>
Q_PROPERTY(<span class="type">qreal</span> lineWidth READ lineWidth WRITE setLineWidth)
Q_PROPERTY(<span class="type">QString</span> lineCap READ lineCap WRITE setLineCap)
Q_PROPERTY(<span class="type">QString</span> lineJoin READ lineJoin WRITE setLineJoin)
Q_PROPERTY(<span class="type">qreal</span> miterLimit READ miterLimit WRITE setMiterLimit)
<span class="comment">// shadows</span>
Q_PROPERTY(<span class="type">qreal</span> shadowOffsetX READ shadowOffsetX WRITE setShadowOffsetX)
Q_PROPERTY(<span class="type">qreal</span> shadowOffsetY READ shadowOffsetY WRITE setShadowOffsetY)
Q_PROPERTY(<span class="type">qreal</span> shadowBlur READ shadowBlur WRITE setShadowBlur)
Q_PROPERTY(<span class="type">QString</span> shadowColor READ shadowColor WRITE setShadowColor)
<span class="keyword">public</span>:
Context2D(<span class="type">QObject</span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>);
<span class="type">void</span> setSize(<span class="type">int</span> width<span class="operator">,</span> <span class="type">int</span> height);
<span class="type">void</span> setSize(<span class="keyword">const</span> <span class="type">QSize</span> <span class="operator">&</span>size);
<span class="type">QSize</span> size() <span class="keyword">const</span>;
<span class="type">void</span> clear();
<span class="type">void</span> reset();
<span class="comment">// compositing</span>
<span class="type">qreal</span> globalAlpha() <span class="keyword">const</span>; <span class="comment">// (default 1.0)</span>
<span class="type">QString</span> globalCompositeOperation() <span class="keyword">const</span>; <span class="comment">// (default over)</span>
<span class="type">QVariant</span> strokeStyle() <span class="keyword">const</span>; <span class="comment">// (default black)</span>
<span class="type">QVariant</span> fillStyle() <span class="keyword">const</span>; <span class="comment">// (default black)</span>
<span class="type">void</span> setGlobalAlpha(<span class="type">qreal</span> alpha);
<span class="type">void</span> setGlobalCompositeOperation(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span>op);
<span class="type">void</span> setStrokeStyle(<span class="keyword">const</span> <span class="type">QVariant</span> <span class="operator">&</span>style);
<span class="type">void</span> setFillStyle(<span class="keyword">const</span> <span class="type">QVariant</span> <span class="operator">&</span>style);
<span class="comment">// line caps/joins</span>
<span class="type">qreal</span> lineWidth() <span class="keyword">const</span>; <span class="comment">// (default 1)</span>
<span class="type">QString</span> lineCap() <span class="keyword">const</span>; <span class="comment">// "butt", "round", "square" (default "butt")</span>
<span class="type">QString</span> lineJoin() <span class="keyword">const</span>; <span class="comment">// "round", "bevel", "miter" (default "miter")</span>
<span class="type">qreal</span> miterLimit() <span class="keyword">const</span>; <span class="comment">// (default 10)</span>
<span class="type">void</span> setLineWidth(<span class="type">qreal</span> w);
<span class="type">void</span> setLineCap(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span>s);
<span class="type">void</span> setLineJoin(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span>s);
<span class="type">void</span> setMiterLimit(<span class="type">qreal</span> m);
<span class="comment">// shadows</span>
<span class="type">qreal</span> shadowOffsetX() <span class="keyword">const</span>; <span class="comment">// (default 0)</span>
<span class="type">qreal</span> shadowOffsetY() <span class="keyword">const</span>; <span class="comment">// (default 0)</span>
<span class="type">qreal</span> shadowBlur() <span class="keyword">const</span>; <span class="comment">// (default 0)</span>
<span class="type">QString</span> shadowColor() <span class="keyword">const</span>; <span class="comment">// (default black)</span>
<span class="type">void</span> setShadowOffsetX(<span class="type">qreal</span> x);
<span class="type">void</span> setShadowOffsetY(<span class="type">qreal</span> y);
<span class="type">void</span> setShadowBlur(<span class="type">qreal</span> b);
<span class="type">void</span> setShadowColor(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span>str);
<span class="keyword">public</span> <span class="keyword">slots</span>:
<span class="type">void</span> save(); <span class="comment">// push state on state stack</span>
<span class="type">void</span> restore(); <span class="comment">// pop state stack and restore state</span>
<span class="type">void</span> scale(<span class="type">qreal</span> x<span class="operator">,</span> <span class="type">qreal</span> y);
<span class="type">void</span> rotate(<span class="type">qreal</span> angle);
<span class="type">void</span> translate(<span class="type">qreal</span> x<span class="operator">,</span> <span class="type">qreal</span> y);
<span class="type">void</span> transform(<span class="type">qreal</span> m11<span class="operator">,</span> <span class="type">qreal</span> m12<span class="operator">,</span> <span class="type">qreal</span> m21<span class="operator">,</span> <span class="type">qreal</span> m22<span class="operator">,</span>
<span class="type">qreal</span> dx<span class="operator">,</span> <span class="type">qreal</span> dy);
<span class="type">void</span> setTransform(<span class="type">qreal</span> m11<span class="operator">,</span> <span class="type">qreal</span> m12<span class="operator">,</span> <span class="type">qreal</span> m21<span class="operator">,</span> <span class="type">qreal</span> m22<span class="operator">,</span>
<span class="type">qreal</span> dx<span class="operator">,</span> <span class="type">qreal</span> dy);
CanvasGradient createLinearGradient(<span class="type">qreal</span> x0<span class="operator">,</span> <span class="type">qreal</span> y0<span class="operator">,</span>
<span class="type">qreal</span> x1<span class="operator">,</span> <span class="type">qreal</span> y1);
CanvasGradient createRadialGradient(<span class="type">qreal</span> x0<span class="operator">,</span> <span class="type">qreal</span> y0<span class="operator">,</span>
<span class="type">qreal</span> r0<span class="operator">,</span> <span class="type">qreal</span> x1<span class="operator">,</span>
<span class="type">qreal</span> y1<span class="operator">,</span> <span class="type">qreal</span> r1);
<span class="comment">// rects</span>
<span class="type">void</span> clearRect(<span class="type">qreal</span> x<span class="operator">,</span> <span class="type">qreal</span> y<span class="operator">,</span> <span class="type">qreal</span> w<span class="operator">,</span> <span class="type">qreal</span> h);
<span class="type">void</span> fillRect(<span class="type">qreal</span> x<span class="operator">,</span> <span class="type">qreal</span> y<span class="operator">,</span> <span class="type">qreal</span> w<span class="operator">,</span> <span class="type">qreal</span> h);
<span class="type">void</span> strokeRect(<span class="type">qreal</span> x<span class="operator">,</span> <span class="type">qreal</span> y<span class="operator">,</span> <span class="type">qreal</span> w<span class="operator">,</span> <span class="type">qreal</span> h);
<span class="comment">// path API</span>
<span class="type">void</span> beginPath();
<span class="type">void</span> closePath();
<span class="type">void</span> moveTo(<span class="type">qreal</span> x<span class="operator">,</span> <span class="type">qreal</span> y);
<span class="type">void</span> lineTo(<span class="type">qreal</span> x<span class="operator">,</span> <span class="type">qreal</span> y);
<span class="type">void</span> quadraticCurveTo(<span class="type">qreal</span> cpx<span class="operator">,</span> <span class="type">qreal</span> cpy<span class="operator">,</span> <span class="type">qreal</span> x<span class="operator">,</span> <span class="type">qreal</span> y);
<span class="type">void</span> bezierCurveTo(<span class="type">qreal</span> cp1x<span class="operator">,</span> <span class="type">qreal</span> cp1y<span class="operator">,</span>
<span class="type">qreal</span> cp2x<span class="operator">,</span> <span class="type">qreal</span> cp2y<span class="operator">,</span> <span class="type">qreal</span> x<span class="operator">,</span> <span class="type">qreal</span> y);
<span class="type">void</span> arcTo(<span class="type">qreal</span> x1<span class="operator">,</span> <span class="type">qreal</span> y1<span class="operator">,</span> <span class="type">qreal</span> x2<span class="operator">,</span> <span class="type">qreal</span> y2<span class="operator">,</span> <span class="type">qreal</span> radius);
<span class="type">void</span> rect(<span class="type">qreal</span> x<span class="operator">,</span> <span class="type">qreal</span> y<span class="operator">,</span> <span class="type">qreal</span> w<span class="operator">,</span> <span class="type">qreal</span> h);
<span class="type">void</span> arc(<span class="type">qreal</span> x<span class="operator">,</span> <span class="type">qreal</span> y<span class="operator">,</span> <span class="type">qreal</span> radius<span class="operator">,</span>
<span class="type">qreal</span> startAngle<span class="operator">,</span> <span class="type">qreal</span> endAngle<span class="operator">,</span>
bool anticlockwise);
<span class="type">void</span> fill();
<span class="type">void</span> stroke();
<span class="type">void</span> clip();
bool isPointInPath(<span class="type">qreal</span> x<span class="operator">,</span> <span class="type">qreal</span> y) <span class="keyword">const</span>;
<span class="comment">// drawing images</span>
<span class="type">void</span> drawImage(DomImage <span class="operator">*</span>image<span class="operator">,</span> <span class="type">qreal</span> dx<span class="operator">,</span> <span class="type">qreal</span> dy);
<span class="type">void</span> drawImage(DomImage <span class="operator">*</span>image<span class="operator">,</span> <span class="type">qreal</span> dx<span class="operator">,</span> <span class="type">qreal</span> dy<span class="operator">,</span>
<span class="type">qreal</span> dw<span class="operator">,</span> <span class="type">qreal</span> dh);
<span class="type">void</span> drawImage(DomImage <span class="operator">*</span>image<span class="operator">,</span> <span class="type">qreal</span> sx<span class="operator">,</span> <span class="type">qreal</span> sy<span class="operator">,</span>
<span class="type">qreal</span> sw<span class="operator">,</span> <span class="type">qreal</span> sh<span class="operator">,</span> <span class="type">qreal</span> dx<span class="operator">,</span> <span class="type">qreal</span> dy<span class="operator">,</span>
<span class="type">qreal</span> dw<span class="operator">,</span> <span class="type">qreal</span> dh);
<span class="comment">// pixel manipulation</span>
ImageData getImageData(<span class="type">qreal</span> sx<span class="operator">,</span> <span class="type">qreal</span> sy<span class="operator">,</span> <span class="type">qreal</span> sw<span class="operator">,</span> <span class="type">qreal</span> sh);
<span class="type">void</span> putImageData(ImageData image<span class="operator">,</span> <span class="type">qreal</span> dx<span class="operator">,</span> <span class="type">qreal</span> dy);
<span class="keyword">signals</span>:
<span class="type">void</span> changed(<span class="keyword">const</span> <span class="type">QImage</span> <span class="operator">&</span>image);
<span class="keyword">protected</span>:
<span class="type">void</span> timerEvent(<span class="type">QTimerEvent</span> <span class="operator">*</span>e);
<span class="keyword">private</span>:
<span class="type">void</span> beginPainting();
<span class="keyword">const</span> <span class="type">QImage</span> <span class="operator">&</span>endPainting();
<span class="type">void</span> scheduleChange();
<span class="type">int</span> m_changeTimerId;
<span class="type">QImage</span> m_image;
<span class="type">QPainter</span> m_painter;
<span class="type">QPainterPath</span> m_path;
<span class="keyword">enum</span> DirtyFlag {
DirtyTransformationMatrix <span class="operator">=</span> <span class="number">0x00001</span><span class="operator">,</span>
DirtyClippingRegion <span class="operator">=</span> <span class="number">0x00002</span><span class="operator">,</span>
DirtyStrokeStyle <span class="operator">=</span> <span class="number">0x00004</span><span class="operator">,</span>
DirtyFillStyle <span class="operator">=</span> <span class="number">0x00008</span><span class="operator">,</span>
DirtyGlobalAlpha <span class="operator">=</span> <span class="number">0x00010</span><span class="operator">,</span>
DirtyLineWidth <span class="operator">=</span> <span class="number">0x00020</span><span class="operator">,</span>
DirtyLineCap <span class="operator">=</span> <span class="number">0x00040</span><span class="operator">,</span>
DirtyLineJoin <span class="operator">=</span> <span class="number">0x00080</span><span class="operator">,</span>
DirtyMiterLimit <span class="operator">=</span> <span class="number">0x00100</span><span class="operator">,</span>
MDirtyPen <span class="operator">=</span> DirtyStrokeStyle
<span class="operator">|</span> DirtyLineWidth
<span class="operator">|</span> DirtyLineCap
<span class="operator">|</span> DirtyLineJoin
<span class="operator">|</span> DirtyMiterLimit<span class="operator">,</span>
DirtyShadowOffsetX <span class="operator">=</span> <span class="number">0x00200</span><span class="operator">,</span>
DirtyShadowOffsetY <span class="operator">=</span> <span class="number">0x00400</span><span class="operator">,</span>
DirtyShadowBlur <span class="operator">=</span> <span class="number">0x00800</span><span class="operator">,</span>
DirtyShadowColor <span class="operator">=</span> <span class="number">0x01000</span><span class="operator">,</span>
DirtyGlobalCompositeOperation <span class="operator">=</span> <span class="number">0x2000</span><span class="operator">,</span>
DirtyFont <span class="operator">=</span> <span class="number">0x04000</span><span class="operator">,</span>
DirtyTextAlign <span class="operator">=</span> <span class="number">0x08000</span><span class="operator">,</span>
DirtyTextBaseline <span class="operator">=</span> <span class="number">0x10000</span><span class="operator">,</span>
AllIsFullOfDirt <span class="operator">=</span> <span class="number">0xfffff</span>
};
<span class="keyword">struct</span> State {
State() : flags(<span class="number">0</span>) {}
<span class="type">QMatrix</span> matrix;
<span class="type">QPainterPath</span> clipPath;
<span class="type">QBrush</span> strokeStyle;
<span class="type">QBrush</span> fillStyle;
<span class="type">qreal</span> globalAlpha;
<span class="type">qreal</span> lineWidth;
<span class="type">Qt</span><span class="operator">::</span>PenCapStyle lineCap;
<span class="type">Qt</span><span class="operator">::</span>PenJoinStyle lineJoin;
<span class="type">qreal</span> miterLimit;
<span class="type">qreal</span> shadowOffsetX;
<span class="type">qreal</span> shadowOffsetY;
<span class="type">qreal</span> shadowBlur;
<span class="type">QColor</span> shadowColor;
<span class="type">QPainter</span><span class="operator">::</span>CompositionMode globalCompositeOperation;
<span class="type">QFont</span> font;
<span class="type">int</span> textAlign;
<span class="type">int</span> textBaseline;
<span class="type">int</span> flags;
};
State m_state;
<span class="type">QStack</span><span class="operator"><</span>State<span class="operator">></span> m_stateStack;
};
<span class="preprocessor">#endif</span>
</pre>
</div>
<!-- @@@script/context2d/context2d.h -->
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Documentation contributions included herein are the copyrights of
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distrib
>
Mageia
>
7
>
armv7hl
>
media
>
core-updates
>
by-pkgid
>
32e951f007f30f654c2e19437a4aa0ce
>
files
>
56
