1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the examples of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:BSD$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** BSD License Usage
18** Alternatively, you may use this file under the terms of the BSD license
19** as follows:
20**
21** "Redistribution and use in source and binary forms, with or without
22** modification, are permitted provided that the following conditions are
23** met:
24** * Redistributions of source code must retain the above copyright
25** notice, this list of conditions and the following disclaimer.
26** * Redistributions in binary form must reproduce the above copyright
27** notice, this list of conditions and the following disclaimer in
28** the documentation and/or other materials provided with the
29** distribution.
30** * Neither the name of The Qt Company Ltd nor the names of its
31** contributors may be used to endorse or promote products derived
32** from this software without specific prior written permission.
33**
34**
35** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
36** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
37** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
38** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
39** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
42** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
43** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
44** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
45** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
46**
47** $QT_END_LICENSE$
48**
49****************************************************************************/
50
51#include "renderarea.h"
52
53#include <QPainter>
54#include <QPaintEvent>
55
56//! [0]
57RenderArea::RenderArea(QWidget *parent)
58 : QWidget(parent)
59{
60 QFont newFont = font();
61 newFont.setPixelSize(12);
62 setFont(newFont);
63
64 QFontMetrics fontMetrics(newFont);
65 xBoundingRect = fontMetrics.boundingRect(tr("x"));
66 yBoundingRect = fontMetrics.boundingRect(tr("y"));
67}
68//! [0]
69
70//! [1]
71void RenderArea::setOperations(const QList<Operation> &operations)
72{
73 this->operations = operations;
74 update();
75}
76//! [1]
77
78//! [2]
79void RenderArea::setShape(const QPainterPath &shape)
80{
81 this->shape = shape;
82 update();
83}
84//! [2]
85
86//! [3]
87QSize RenderArea::minimumSizeHint() const
88{
89 return QSize(182, 182);
90}
91//! [3]
92
93//! [4]
94QSize RenderArea::sizeHint() const
95{
96 return QSize(232, 232);
97}
98//! [4]
99
100//! [5]
101void RenderArea::paintEvent(QPaintEvent *event)
102{
103 QPainter painter(this);
104 painter.setRenderHint(QPainter::Antialiasing);
105 painter.fillRect(event->rect(), QBrush(Qt::white));
106
107 painter.translate(66, 66);
108//! [5]
109
110//! [6]
111 painter.save();
112 transformPainter(painter);
113 drawShape(painter);
114 painter.restore();
115//! [6]
116
117//! [7]
118 drawOutline(painter);
119//! [7]
120
121//! [8]
122 transformPainter(painter);
123 drawCoordinates(painter);
124}
125//! [8]
126
127//! [9]
128void RenderArea::drawCoordinates(QPainter &painter)
129{
130 painter.setPen(Qt::red);
131
132 painter.drawLine(0, 0, 50, 0);
133 painter.drawLine(48, -2, 50, 0);
134 painter.drawLine(48, 2, 50, 0);
135 painter.drawText(60 - xBoundingRect.width() / 2,
136 0 + xBoundingRect.height() / 2, tr("x"));
137
138 painter.drawLine(0, 0, 0, 50);
139 painter.drawLine(-2, 48, 0, 50);
140 painter.drawLine(2, 48, 0, 50);
141 painter.drawText(0 - yBoundingRect.width() / 2,
142 60 + yBoundingRect.height() / 2, tr("y"));
143}
144//! [9]
145
146//! [10]
147void RenderArea::drawOutline(QPainter &painter)
148{
149 painter.setPen(Qt::darkGreen);
150 painter.setPen(Qt::DashLine);
151 painter.setBrush(Qt::NoBrush);
152 painter.drawRect(0, 0, 100, 100);
153}
154//! [10]
155
156//! [11]
157void RenderArea::drawShape(QPainter &painter)
158{
159 painter.fillPath(shape, Qt::blue);
160}
161//! [11]
162
163//! [12]
164void RenderArea::transformPainter(QPainter &painter)
165{
166 for (int i = 0; i < operations.size(); ++i) {
167 switch (operations[i]) {
168 case Translate:
169 painter.translate(50, 50);
170 break;
171 case Scale:
172 painter.scale(0.75, 0.75);
173 break;
174 case Rotate:
175 painter.rotate(60);
176 break;
177 case NoTransformation:
178 default:
179 ;
180 }
181 }
182}
183//! [12]
184