<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>tabletcanvas.cpp Example File | Qt Widgets 5.12.2</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.12</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-widgets-tablet-example.html">Tablet Example</a></td><td >tabletcanvas.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtwidgets-index.html">Qt 5.12.2 Reference Documentation</a></td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">tabletcanvas.cpp Example File</h1> <span class="subtitle">widgets/tablet/tabletcanvas.cpp</span> <!-- $$$widgets/tablet/tabletcanvas.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2016 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 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#include <QtWidgets></span> <span class="preprocessor">#include <math.h></span> <span class="preprocessor">#include "tabletcanvas.h"</span> TabletCanvas<span class="operator">::</span>TabletCanvas() : <span class="type"><a href="qwidget.html">QWidget</a></span>(nullptr) <span class="operator">,</span> m_alphaChannelValuator(TangentialPressureValuator) <span class="operator">,</span> m_colorSaturationValuator(NoValuator) <span class="operator">,</span> m_lineWidthValuator(PressureValuator) <span class="operator">,</span> m_color(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>red) <span class="operator">,</span> m_brush(m_color) <span class="operator">,</span> m_pen(m_brush<span class="operator">,</span> <span class="number">1.0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>SolidLine<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>RoundCap<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>RoundJoin) <span class="operator">,</span> m_deviceDown(<span class="keyword">false</span>) { resize(<span class="number">500</span><span class="operator">,</span> <span class="number">500</span>); setAutoFillBackground(<span class="keyword">true</span>); setAttribute(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WA_TabletTracking); } bool TabletCanvas<span class="operator">::</span>saveImage(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>file) { <span class="keyword">return</span> m_pixmap<span class="operator">.</span>save(file); } bool TabletCanvas<span class="operator">::</span>loadImage(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>file) { bool success <span class="operator">=</span> m_pixmap<span class="operator">.</span>load(file); <span class="keyword">if</span> (success) { update(); <span class="keyword">return</span> <span class="keyword">true</span>; } <span class="keyword">return</span> <span class="keyword">false</span>; } <span class="type">void</span> TabletCanvas<span class="operator">::</span>clear() { m_pixmap<span class="operator">.</span>fill(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>white); update(); } <span class="type">void</span> TabletCanvas<span class="operator">::</span>tabletEvent(<span class="type"><a href="../qtgui/qtabletevent.html">QTabletEvent</a></span> <span class="operator">*</span>event) { <span class="keyword">switch</span> (event<span class="operator">-</span><span class="operator">></span>type()) { <span class="keyword">case</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>TabletPress: <span class="keyword">if</span> (<span class="operator">!</span>m_deviceDown) { m_deviceDown <span class="operator">=</span> <span class="keyword">true</span>; lastPoint<span class="operator">.</span>pos <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>posF(); lastPoint<span class="operator">.</span>pressure <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pressure(); lastPoint<span class="operator">.</span>rotation <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>rotation(); } <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>TabletMove: <span class="preprocessor">#ifndef Q_OS_IOS</span> <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>device() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtgui/qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>RotationStylus) updateCursor(event); <span class="preprocessor">#endif</span> <span class="keyword">if</span> (m_deviceDown) { updateBrush(event); <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="operator">&</span>m_pixmap); paintPixmap(painter<span class="operator">,</span> event); lastPoint<span class="operator">.</span>pos <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>posF(); lastPoint<span class="operator">.</span>pressure <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pressure(); lastPoint<span class="operator">.</span>rotation <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>rotation(); } <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>TabletRelease: <span class="keyword">if</span> (m_deviceDown <span class="operator">&</span><span class="operator">&</span> event<span class="operator">-</span><span class="operator">></span>buttons() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>NoButton) m_deviceDown <span class="operator">=</span> <span class="keyword">false</span>; update(); <span class="keyword">break</span>; <span class="keyword">default</span>: <span class="keyword">break</span>; } event<span class="operator">-</span><span class="operator">></span>accept(); } <span class="type">void</span> TabletCanvas<span class="operator">::</span>initPixmap() { <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> dpr <span class="operator">=</span> devicePixelRatioF(); <span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span> newPixmap <span class="operator">=</span> <span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span>(width() <span class="operator">*</span> dpr<span class="operator">,</span> height() <span class="operator">*</span> dpr); newPixmap<span class="operator">.</span>setDevicePixelRatio(dpr); newPixmap<span class="operator">.</span>fill(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>white); <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="operator">&</span>newPixmap); <span class="keyword">if</span> (<span class="operator">!</span>m_pixmap<span class="operator">.</span>isNull()) painter<span class="operator">.</span>drawPixmap(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> m_pixmap); painter<span class="operator">.</span>end(); m_pixmap <span class="operator">=</span> newPixmap; } <span class="type">void</span> TabletCanvas<span class="operator">::</span>paintEvent(<span class="type"><a href="../qtgui/qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>event) { <span class="keyword">if</span> (m_pixmap<span class="operator">.</span>isNull()) initPixmap(); <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="keyword">this</span>); <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> pixmapPortion <span class="operator">=</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span>(event<span class="operator">-</span><span class="operator">></span>rect()<span class="operator">.</span>topLeft() <span class="operator">*</span> devicePixelRatioF()<span class="operator">,</span> event<span class="operator">-</span><span class="operator">></span>rect()<span class="operator">.</span>size() <span class="operator">*</span> devicePixelRatioF()); painter<span class="operator">.</span>drawPixmap(event<span class="operator">-</span><span class="operator">></span>rect()<span class="operator">.</span>topLeft()<span class="operator">,</span> m_pixmap<span class="operator">,</span> pixmapPortion); } <span class="type">void</span> TabletCanvas<span class="operator">::</span>paintPixmap(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">&</span>painter<span class="operator">,</span> <span class="type"><a href="../qtgui/qtabletevent.html">QTabletEvent</a></span> <span class="operator">*</span>event) { <span class="keyword">static</span> <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> maxPenRadius <span class="operator">=</span> pressureToWidth(<span class="number">1.0</span>); painter<span class="operator">.</span>setRenderHint(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing); <span class="keyword">switch</span> (event<span class="operator">-</span><span class="operator">></span>device()) { <span class="keyword">case</span> <span class="type"><a href="../qtgui/qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>Airbrush: { painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>NoPen); <span class="type"><a href="../qtgui/qradialgradient.html">QRadialGradient</a></span> grad(lastPoint<span class="operator">.</span>pos<span class="operator">,</span> m_pen<span class="operator">.</span>widthF() <span class="operator">*</span> <span class="number">10.0</span>); <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> color <span class="operator">=</span> m_brush<span class="operator">.</span>color(); color<span class="operator">.</span>setAlphaF(color<span class="operator">.</span>alphaF() <span class="operator">*</span> <span class="number">0.25</span>); grad<span class="operator">.</span>setColorAt(<span class="number">0</span><span class="operator">,</span> m_brush<span class="operator">.</span>color()); grad<span class="operator">.</span>setColorAt(<span class="number">0.5</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>transparent); painter<span class="operator">.</span>setBrush(grad); <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> radius <span class="operator">=</span> grad<span class="operator">.</span>radius(); painter<span class="operator">.</span>drawEllipse(event<span class="operator">-</span><span class="operator">></span>posF()<span class="operator">,</span> radius<span class="operator">,</span> radius); update(<span class="type"><a href="../qtcore/qrect.html">QRect</a></span>(event<span class="operator">-</span><span class="operator">></span>pos() <span class="operator">-</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span>(radius<span class="operator">,</span> radius)<span class="operator">,</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(radius <span class="operator">*</span> <span class="number">2</span><span class="operator">,</span> radius <span class="operator">*</span> <span class="number">2</span>))); } <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type"><a href="../qtgui/qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>RotationStylus: { m_brush<span class="operator">.</span>setStyle(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>SolidPattern); painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>NoPen); painter<span class="operator">.</span>setBrush(m_brush); <span class="type"><a href="../qtgui/qpolygonf.html">QPolygonF</a></span> poly; <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> halfWidth <span class="operator">=</span> pressureToWidth(lastPoint<span class="operator">.</span>pressure); <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span> brushAdjust(<a href="../qtcore/qtmath.html#qSin">qSin</a>(<a href="../qtcore/qtmath.html#qDegreesToRadians-1">qDegreesToRadians</a>(<span class="operator">-</span>lastPoint<span class="operator">.</span>rotation)) <span class="operator">*</span> halfWidth<span class="operator">,</span> <a href="../qtcore/qtmath.html#qCos">qCos</a>(<a href="../qtcore/qtmath.html#qDegreesToRadians-1">qDegreesToRadians</a>(<span class="operator">-</span>lastPoint<span class="operator">.</span>rotation)) <span class="operator">*</span> halfWidth); poly <span class="operator"><</span><span class="operator"><</span> lastPoint<span class="operator">.</span>pos <span class="operator">+</span> brushAdjust; poly <span class="operator"><</span><span class="operator"><</span> lastPoint<span class="operator">.</span>pos <span class="operator">-</span> brushAdjust; halfWidth <span class="operator">=</span> m_pen<span class="operator">.</span>widthF(); brushAdjust <span class="operator">=</span> <span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<a href="../qtcore/qtmath.html#qSin">qSin</a>(<a href="../qtcore/qtmath.html#qDegreesToRadians-1">qDegreesToRadians</a>(<span class="operator">-</span>event<span class="operator">-</span><span class="operator">></span>rotation())) <span class="operator">*</span> halfWidth<span class="operator">,</span> <a href="../qtcore/qtmath.html#qCos">qCos</a>(<a href="../qtcore/qtmath.html#qDegreesToRadians-1">qDegreesToRadians</a>(<span class="operator">-</span>event<span class="operator">-</span><span class="operator">></span>rotation())) <span class="operator">*</span> halfWidth); poly <span class="operator"><</span><span class="operator"><</span> event<span class="operator">-</span><span class="operator">></span>posF() <span class="operator">-</span> brushAdjust; poly <span class="operator"><</span><span class="operator"><</span> event<span class="operator">-</span><span class="operator">></span>posF() <span class="operator">+</span> brushAdjust; painter<span class="operator">.</span>drawConvexPolygon(poly); update(poly<span class="operator">.</span>boundingRect()<span class="operator">.</span>toRect()); } <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type"><a href="../qtgui/qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>Puck: <span class="keyword">case</span> <span class="type"><a href="../qtgui/qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>FourDMouse: { <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> error(tr(<span class="string">"This input device is not supported by the example."</span>)); <span class="preprocessor">#if QT_CONFIG(statustip)</span> <span class="type"><a href="../qtgui/qstatustipevent.html">QStatusTipEvent</a></span> status(error); <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>sendEvent(<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>status); <span class="preprocessor">#else</span> <a href="../qtcore/qtglobal.html#qWarning">qWarning</a>() <span class="operator"><</span><span class="operator"><</span> error; <span class="preprocessor">#endif</span> } <span class="keyword">break</span>; <span class="keyword">default</span>: { <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> error(tr(<span class="string">"Unknown tablet device - treating as stylus"</span>)); <span class="preprocessor">#if QT_CONFIG(statustip)</span> <span class="type"><a href="../qtgui/qstatustipevent.html">QStatusTipEvent</a></span> status(error); <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>sendEvent(<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>status); <span class="preprocessor">#else</span> <a href="../qtcore/qtglobal.html#qWarning">qWarning</a>() <span class="operator"><</span><span class="operator"><</span> error; <span class="preprocessor">#endif</span> } Q_FALLTHROUGH(); <span class="keyword">case</span> <span class="type"><a href="../qtgui/qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>Stylus: painter<span class="operator">.</span>setPen(m_pen); painter<span class="operator">.</span>drawLine(lastPoint<span class="operator">.</span>pos<span class="operator">,</span> event<span class="operator">-</span><span class="operator">></span>posF()); update(<span class="type"><a href="../qtcore/qrect.html">QRect</a></span>(lastPoint<span class="operator">.</span>pos<span class="operator">.</span>toPoint()<span class="operator">,</span> event<span class="operator">-</span><span class="operator">></span>pos())<span class="operator">.</span>normalized() <span class="operator">.</span>adjusted(<span class="operator">-</span>maxPenRadius<span class="operator">,</span> <span class="operator">-</span>maxPenRadius<span class="operator">,</span> maxPenRadius<span class="operator">,</span> maxPenRadius)); <span class="keyword">break</span>; } } <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> TabletCanvas<span class="operator">::</span>pressureToWidth(<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> pressure) { <span class="keyword">return</span> pressure <span class="operator">*</span> <span class="number">10</span> <span class="operator">+</span> <span class="number">1</span>; } <span class="type">void</span> TabletCanvas<span class="operator">::</span>updateBrush(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qtabletevent.html">QTabletEvent</a></span> <span class="operator">*</span>event) { <span class="type">int</span> hue<span class="operator">,</span> saturation<span class="operator">,</span> value<span class="operator">,</span> alpha; m_color<span class="operator">.</span>getHsv(<span class="operator">&</span>hue<span class="operator">,</span> <span class="operator">&</span>saturation<span class="operator">,</span> <span class="operator">&</span>value<span class="operator">,</span> <span class="operator">&</span>alpha); <span class="type">int</span> vValue <span class="operator">=</span> <span class="type">int</span>(((event<span class="operator">-</span><span class="operator">></span>yTilt() <span class="operator">+</span> <span class="number">60.0</span>) <span class="operator">/</span> <span class="number">120.0</span>) <span class="operator">*</span> <span class="number">255</span>); <span class="type">int</span> hValue <span class="operator">=</span> <span class="type">int</span>(((event<span class="operator">-</span><span class="operator">></span>xTilt() <span class="operator">+</span> <span class="number">60.0</span>) <span class="operator">/</span> <span class="number">120.0</span>) <span class="operator">*</span> <span class="number">255</span>); <span class="keyword">switch</span> (m_alphaChannelValuator) { <span class="keyword">case</span> PressureValuator: m_color<span class="operator">.</span>setAlphaF(event<span class="operator">-</span><span class="operator">></span>pressure()); <span class="keyword">break</span>; <span class="keyword">case</span> TangentialPressureValuator: <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>device() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtgui/qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>Airbrush) m_color<span class="operator">.</span>setAlphaF(<a href="../qtcore/qtglobal.html#qMax">qMax</a>(<span class="number">0.01</span><span class="operator">,</span> (event<span class="operator">-</span><span class="operator">></span>tangentialPressure() <span class="operator">+</span> <span class="number">1.0</span>) <span class="operator">/</span> <span class="number">2.0</span>)); <span class="keyword">else</span> m_color<span class="operator">.</span>setAlpha(<span class="number">255</span>); <span class="keyword">break</span>; <span class="keyword">case</span> TiltValuator: m_color<span class="operator">.</span>setAlpha(maximum(abs(vValue <span class="operator">-</span> <span class="number">127</span>)<span class="operator">,</span> abs(hValue <span class="operator">-</span> <span class="number">127</span>))); <span class="keyword">break</span>; <span class="keyword">default</span>: m_color<span class="operator">.</span>setAlpha(<span class="number">255</span>); } <span class="keyword">switch</span> (m_colorSaturationValuator) { <span class="keyword">case</span> VTiltValuator: m_color<span class="operator">.</span>setHsv(hue<span class="operator">,</span> vValue<span class="operator">,</span> value<span class="operator">,</span> alpha); <span class="keyword">break</span>; <span class="keyword">case</span> HTiltValuator: m_color<span class="operator">.</span>setHsv(hue<span class="operator">,</span> hValue<span class="operator">,</span> value<span class="operator">,</span> alpha); <span class="keyword">break</span>; <span class="keyword">case</span> PressureValuator: m_color<span class="operator">.</span>setHsv(hue<span class="operator">,</span> <span class="type">int</span>(event<span class="operator">-</span><span class="operator">></span>pressure() <span class="operator">*</span> <span class="number">255.0</span>)<span class="operator">,</span> value<span class="operator">,</span> alpha); <span class="keyword">break</span>; <span class="keyword">default</span>: ; } <span class="keyword">switch</span> (m_lineWidthValuator) { <span class="keyword">case</span> PressureValuator: m_pen<span class="operator">.</span>setWidthF(pressureToWidth(event<span class="operator">-</span><span class="operator">></span>pressure())); <span class="keyword">break</span>; <span class="keyword">case</span> TiltValuator: m_pen<span class="operator">.</span>setWidthF(maximum(abs(vValue <span class="operator">-</span> <span class="number">127</span>)<span class="operator">,</span> abs(hValue <span class="operator">-</span> <span class="number">127</span>)) <span class="operator">/</span> <span class="number">12</span>); <span class="keyword">break</span>; <span class="keyword">default</span>: m_pen<span class="operator">.</span>setWidthF(<span class="number">1</span>); } <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>pointerType() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtgui/qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>Eraser) { m_brush<span class="operator">.</span>setColor(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>white); m_pen<span class="operator">.</span>setColor(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>white); m_pen<span class="operator">.</span>setWidthF(event<span class="operator">-</span><span class="operator">></span>pressure() <span class="operator">*</span> <span class="number">10</span> <span class="operator">+</span> <span class="number">1</span>); } <span class="keyword">else</span> { m_brush<span class="operator">.</span>setColor(m_color); m_pen<span class="operator">.</span>setColor(m_color); } } <span class="type">void</span> TabletCanvas<span class="operator">::</span>updateCursor(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qtabletevent.html">QTabletEvent</a></span> <span class="operator">*</span>event) { <span class="type"><a href="../qtgui/qcursor.html">QCursor</a></span> cursor; <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>type() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>TabletLeaveProximity) { <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>pointerType() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtgui/qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>Eraser) { cursor <span class="operator">=</span> <span class="type"><a href="../qtgui/qcursor.html">QCursor</a></span>(<span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span>(<span class="string">":/images/cursor-eraser.png"</span>)<span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">28</span>); } <span class="keyword">else</span> { <span class="keyword">switch</span> (event<span class="operator">-</span><span class="operator">></span>device()) { <span class="keyword">case</span> <span class="type"><a href="../qtgui/qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>Stylus: cursor <span class="operator">=</span> <span class="type"><a href="../qtgui/qcursor.html">QCursor</a></span>(<span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span>(<span class="string">":/images/cursor-pencil.png"</span>)<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>); <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type"><a href="../qtgui/qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>Airbrush: cursor <span class="operator">=</span> <span class="type"><a href="../qtgui/qcursor.html">QCursor</a></span>(<span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span>(<span class="string">":/images/cursor-airbrush.png"</span>)<span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">4</span>); <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type"><a href="../qtgui/qtabletevent.html">QTabletEvent</a></span><span class="operator">::</span>RotationStylus: { <span class="type"><a href="../qtgui/qimage.html">QImage</a></span> origImg(QLatin1String(<span class="string">":/images/cursor-felt-marker.png"</span>)); <span class="type"><a href="../qtgui/qimage.html">QImage</a></span> img(<span class="number">32</span><span class="operator">,</span> <span class="number">32</span><span class="operator">,</span> <span class="type"><a href="../qtgui/qimage.html">QImage</a></span><span class="operator">::</span>Format_ARGB32); <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> solid <span class="operator">=</span> m_color; solid<span class="operator">.</span>setAlpha(<span class="number">255</span>); img<span class="operator">.</span>fill(solid); <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="operator">&</span>img); <span class="type"><a href="../qtgui/qtransform.html">QTransform</a></span> transform <span class="operator">=</span> painter<span class="operator">.</span>transform(); transform<span class="operator">.</span>translate(<span class="number">16</span><span class="operator">,</span> <span class="number">16</span>); transform<span class="operator">.</span>rotate(event<span class="operator">-</span><span class="operator">></span>rotation()); painter<span class="operator">.</span>setTransform(transform); painter<span class="operator">.</span>setCompositionMode(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_DestinationIn); painter<span class="operator">.</span>drawImage(<span class="operator">-</span><span class="number">24</span><span class="operator">,</span> <span class="operator">-</span><span class="number">24</span><span class="operator">,</span> origImg); painter<span class="operator">.</span>setCompositionMode(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">::</span>CompositionMode_HardLight); painter<span class="operator">.</span>drawImage(<span class="operator">-</span><span class="number">24</span><span class="operator">,</span> <span class="operator">-</span><span class="number">24</span><span class="operator">,</span> origImg); painter<span class="operator">.</span>end(); cursor <span class="operator">=</span> <span class="type"><a href="../qtgui/qcursor.html">QCursor</a></span>(<span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span><span class="operator">::</span>fromImage(img)<span class="operator">,</span> <span class="number">16</span><span class="operator">,</span> <span class="number">16</span>); } <span class="keyword">break</span>; <span class="keyword">default</span>: <span class="keyword">break</span>; } } } setCursor(cursor); } <span class="type">void</span> TabletCanvas<span class="operator">::</span>resizeEvent(<span class="type"><a href="../qtgui/qresizeevent.html">QResizeEvent</a></span> <span class="operator">*</span>) { initPixmap(); } </pre> </div> <!-- @@@widgets/tablet/tabletcanvas.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. 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/> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>