1 | /****************************************************************************
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2 | **
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3 | ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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4 | ** Contact: Qt Software Information ([email protected])
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5 | **
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6 | ** This file is part of the examples of the Qt Toolkit.
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7 | **
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8 | ** $QT_BEGIN_LICENSE:LGPL$
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9 | ** Commercial Usage
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10 | ** Licensees holding valid Qt Commercial licenses may use this file in
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11 | ** accordance with the Qt Commercial License Agreement provided with the
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12 | ** Software or, alternatively, in accordance with the terms contained in
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13 | ** a written agreement between you and Nokia.
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14 | **
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15 | ** GNU Lesser General Public License Usage
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16 | ** Alternatively, this file may be used under the terms of the GNU Lesser
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17 | ** General Public License version 2.1 as published by the Free Software
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18 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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19 | ** packaging of this file. Please review the following information to
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20 | ** ensure the GNU Lesser General Public License version 2.1 requirements
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21 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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22 | **
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23 | ** In addition, as a special exception, Nokia gives you certain
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24 | ** additional rights. These rights are described in the Nokia Qt LGPL
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25 | ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
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26 | ** package.
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27 | **
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28 | ** GNU General Public License Usage
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29 | ** Alternatively, this file may be used under the terms of the GNU
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30 | ** General Public License version 3.0 as published by the Free Software
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31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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32 | ** packaging of this file. Please review the following information to
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33 | ** ensure the GNU General Public License version 3.0 requirements will be
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34 | ** met: http://www.gnu.org/copyleft/gpl.html.
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35 | **
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36 | ** If you are unsure which license is appropriate for your use, please
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37 | ** contact the sales department at [email protected].
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38 | ** $QT_END_LICENSE$
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39 | **
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40 | ****************************************************************************/
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41 |
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42 | #include <QtGui>
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43 |
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44 | #include "scribblearea.h"
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45 |
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46 | //! [0]
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47 | ScribbleArea::ScribbleArea(QWidget *parent)
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48 | : QWidget(parent)
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49 | {
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50 | setAttribute(Qt::WA_StaticContents);
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51 | modified = false;
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52 | scribbling = false;
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53 | myPenWidth = 1;
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54 | myPenColor = Qt::blue;
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55 | }
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56 | //! [0]
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57 |
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58 | //! [1]
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59 | bool ScribbleArea::openImage(const QString &fileName)
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60 | //! [1] //! [2]
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61 | {
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62 | QImage loadedImage;
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63 | if (!loadedImage.load(fileName))
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64 | return false;
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65 |
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66 | QSize newSize = loadedImage.size().expandedTo(size());
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67 | resizeImage(&loadedImage, newSize);
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68 | image = loadedImage;
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69 | modified = false;
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70 | update();
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71 | return true;
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72 | }
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73 | //! [2]
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74 |
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75 | //! [3]
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76 | bool ScribbleArea::saveImage(const QString &fileName, const char *fileFormat)
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77 | //! [3] //! [4]
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78 | {
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79 | QImage visibleImage = image;
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80 | resizeImage(&visibleImage, size());
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81 |
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82 | if (visibleImage.save(fileName, fileFormat)) {
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83 | modified = false;
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84 | return true;
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85 | } else {
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86 | return false;
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87 | }
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88 | }
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89 | //! [4]
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90 |
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91 | //! [5]
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92 | void ScribbleArea::setPenColor(const QColor &newColor)
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93 | //! [5] //! [6]
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94 | {
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95 | myPenColor = newColor;
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96 | }
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97 | //! [6]
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98 |
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99 | //! [7]
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100 | void ScribbleArea::setPenWidth(int newWidth)
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101 | //! [7] //! [8]
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102 | {
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103 | myPenWidth = newWidth;
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104 | }
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105 | //! [8]
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106 |
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107 | //! [9]
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108 | void ScribbleArea::clearImage()
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109 | //! [9] //! [10]
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110 | {
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111 | image.fill(qRgb(255, 255, 255));
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112 | modified = true;
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113 | update();
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114 | }
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115 | //! [10]
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116 |
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117 | //! [11]
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118 | void ScribbleArea::mousePressEvent(QMouseEvent *event)
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119 | //! [11] //! [12]
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120 | {
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121 | if (event->button() == Qt::LeftButton) {
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122 | lastPoint = event->pos();
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123 | scribbling = true;
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124 | }
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125 | }
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126 |
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127 | void ScribbleArea::mouseMoveEvent(QMouseEvent *event)
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128 | {
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129 | if ((event->buttons() & Qt::LeftButton) && scribbling)
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130 | drawLineTo(event->pos());
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131 | }
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132 |
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133 | void ScribbleArea::mouseReleaseEvent(QMouseEvent *event)
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134 | {
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135 | if (event->button() == Qt::LeftButton && scribbling) {
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136 | drawLineTo(event->pos());
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137 | scribbling = false;
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138 | }
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139 | }
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140 |
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141 | //! [12] //! [13]
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142 | void ScribbleArea::paintEvent(QPaintEvent * /* event */)
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143 | //! [13] //! [14]
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144 | {
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145 | QPainter painter(this);
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146 | painter.drawImage(QPoint(0, 0), image);
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147 | }
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148 | //! [14]
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149 |
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150 | //! [15]
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151 | void ScribbleArea::resizeEvent(QResizeEvent *event)
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152 | //! [15] //! [16]
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153 | {
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154 | if (width() > image.width() || height() > image.height()) {
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155 | int newWidth = qMax(width() + 128, image.width());
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156 | int newHeight = qMax(height() + 128, image.height());
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157 | resizeImage(&image, QSize(newWidth, newHeight));
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158 | update();
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159 | }
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160 | QWidget::resizeEvent(event);
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161 | }
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162 | //! [16]
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163 |
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164 | //! [17]
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165 | void ScribbleArea::drawLineTo(const QPoint &endPoint)
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166 | //! [17] //! [18]
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167 | {
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168 | QPainter painter(&image);
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169 | painter.setPen(QPen(myPenColor, myPenWidth, Qt::SolidLine, Qt::RoundCap,
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170 | Qt::RoundJoin));
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171 | painter.drawLine(lastPoint, endPoint);
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172 | modified = true;
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173 |
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174 | int rad = (myPenWidth / 2) + 2;
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175 | update(QRect(lastPoint, endPoint).normalized()
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176 | .adjusted(-rad, -rad, +rad, +rad));
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177 | lastPoint = endPoint;
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178 | }
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179 | //! [18]
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180 |
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181 | //! [19]
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182 | void ScribbleArea::resizeImage(QImage *image, const QSize &newSize)
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183 | //! [19] //! [20]
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184 | {
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185 | if (image->size() == newSize)
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186 | return;
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187 |
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188 | QImage newImage(newSize, QImage::Format_RGB32);
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189 | newImage.fill(qRgb(255, 255, 255));
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190 | QPainter painter(&newImage);
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191 | painter.drawImage(QPoint(0, 0), *image);
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192 | *image = newImage;
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193 | }
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194 | //! [20]
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195 |
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196 | //! [21]
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197 | void ScribbleArea::print()
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198 | {
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199 | #ifndef QT_NO_PRINTER
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200 | QPrinter printer(QPrinter::HighResolution);
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201 |
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202 | QPrintDialog *printDialog = new QPrintDialog(&printer, this);
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203 | //! [21] //! [22]
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204 | if (printDialog->exec() == QDialog::Accepted) {
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205 | QPainter painter(&printer);
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206 | QRect rect = painter.viewport();
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207 | QSize size = image.size();
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208 | size.scale(rect.size(), Qt::KeepAspectRatio);
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209 | painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
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210 | painter.setWindow(image.rect());
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211 | painter.drawImage(0, 0, image);
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212 | }
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213 | #endif // QT_NO_PRINTER
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214 | }
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215 | //! [22]
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