source: trunk/examples/opengl/overpainting/glwidget.cpp@ 146

Last change on this file since 146 was 2, checked in by Dmitry A. Kuminov, 16 years ago

Initially imported qt-all-opensource-src-4.5.1 from Trolltech.
File size: 9.6 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4** Contact: Qt Software Information (qt-info@nokia.com)
5**
6** This file is part of the examples of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial Usage
10** Licensees holding valid Qt Commercial licenses may use this file in
11** accordance with the Qt Commercial License Agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and Nokia.
14**
15** GNU Lesser General Public License Usage
16** Alternatively, this file may be used under the terms of the GNU Lesser
17** General Public License version 2.1 as published by the Free Software
18** Foundation and appearing in the file LICENSE.LGPL included in the
19** packaging of this file. Please review the following information to
20** ensure the GNU Lesser General Public License version 2.1 requirements
21** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
22**
23** In addition, as a special exception, Nokia gives you certain
24** additional rights. These rights are described in the Nokia Qt LGPL
25** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
26** package.
27**
28** GNU General Public License Usage
29** Alternatively, this file may be used under the terms of the GNU
30** General Public License version 3.0 as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL included in the
32** packaging of this file. Please review the following information to
33** ensure the GNU General Public License version 3.0 requirements will be
34** met: http://www.gnu.org/copyleft/gpl.html.
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39**
40****************************************************************************/
41
42#include <QtGui>
43#include <QtOpenGL>
44#include <stdlib.h>
45
46#include <math.h>
47
48#include "bubble.h"
49#include "glwidget.h"
50
51#ifndef GL_MULTISAMPLE
52#define GL_MULTISAMPLE 0x809D
53#endif
54
55//! [0]
56GLWidget::GLWidget(QWidget *parent)
57 : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
58{
59 QTime midnight(0, 0, 0);
60 qsrand(midnight.secsTo(QTime::currentTime()));
61
62 object = 0;
63 xRot = 0;
64 yRot = 0;
65 zRot = 0;
66
67 trolltechGreen = QColor::fromCmykF(0.40, 0.0, 1.0, 0.0);
68 trolltechPurple = QColor::fromCmykF(0.39, 0.39, 0.0, 0.0);
69
70 animationTimer.setSingleShot(false);
71 connect(&animationTimer, SIGNAL(timeout()), this, SLOT(animate()));
72 animationTimer.start(25);
73
74 setAutoFillBackground(false);
75 setMinimumSize(200, 200);
76 setWindowTitle(tr("Overpainting a Scene"));
77}
78//! [0]
79
80//! [1]
81GLWidget::~GLWidget()
82{
83 makeCurrent();
84 glDeleteLists(object, 1);
85}
86//! [1]
87
88void GLWidget::setXRotation(int angle)
89{
90 normalizeAngle(&angle);
91 if (angle != xRot)
92 xRot = angle;
93}
94
95void GLWidget::setYRotation(int angle)
96{
97 normalizeAngle(&angle);
98 if (angle != yRot)
99 yRot = angle;
100}
101
102void GLWidget::setZRotation(int angle)
103{
104 normalizeAngle(&angle);
105 if (angle != zRot)
106 zRot = angle;
107}
108
109//! [2]
110void GLWidget::initializeGL()
111{
112 object = makeObject();
113}
114//! [2]
115
116void GLWidget::mousePressEvent(QMouseEvent *event)
117{
118 lastPos = event->pos();
119}
120
121void GLWidget::mouseMoveEvent(QMouseEvent *event)
122{
123 int dx = event->x() - lastPos.x();
124 int dy = event->y() - lastPos.y();
125
126 if (event->buttons() & Qt::LeftButton) {
127 setXRotation(xRot + 8 * dy);
128 setYRotation(yRot + 8 * dx);
129 } else if (event->buttons() & Qt::RightButton) {
130 setXRotation(xRot + 8 * dy);
131 setZRotation(zRot + 8 * dx);
132 }
133 lastPos = event->pos();
134}
135
136void GLWidget::paintEvent(QPaintEvent *event)
137{
138 makeCurrent();
139//! [4]
140 glMatrixMode(GL_MODELVIEW);
141 glPushMatrix();
142//! [4]
143
144//! [6]
145 qglClearColor(trolltechPurple.dark());
146 glShadeModel(GL_SMOOTH);
147 glEnable(GL_DEPTH_TEST);
148 glEnable(GL_CULL_FACE);
149 glEnable(GL_LIGHTING);
150 glEnable(GL_LIGHT0);
151 glEnable(GL_MULTISAMPLE);
152 static GLfloat lightPosition[4] = { 0.5, 5.0, 7.0, 1.0 };
153 glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
154
155 setupViewport(width(), height());
156//! [6]
157
158//! [7]
159 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
160 glLoadIdentity();
161 glTranslated(0.0, 0.0, -10.0);
162 glRotated(xRot / 16.0, 1.0, 0.0, 0.0);
163 glRotated(yRot / 16.0, 0.0, 1.0, 0.0);
164 glRotated(zRot / 16.0, 0.0, 0.0, 1.0);
165 glCallList(object);
166//! [7]
167
168//! [8]
169 glMatrixMode(GL_MODELVIEW);
170 glPopMatrix();
171//! [8]
172
173//! [10]
174 QPainter painter(this);
175 painter.setRenderHint(QPainter::Antialiasing);
176 foreach (Bubble *bubble, bubbles) {
177 if (bubble->rect().intersects(event->rect()))
178 bubble->drawBubble(&painter);
179 }
180 drawInstructions(&painter);
181 painter.end();
182}
183//! [10]
184
185//! [11]
186void GLWidget::resizeGL(int width, int height)
187{
188 setupViewport(width, height);
189}
190//! [11]
191
192//! [12]
193void GLWidget::showEvent(QShowEvent *event)
194{
195 Q_UNUSED(event);
196 createBubbles(20 - bubbles.count());
197}
198//! [12]
199
200QSize GLWidget::sizeHint() const
201{
202 return QSize(400, 400);
203}
204
205GLuint GLWidget::makeObject()
206{
207 GLuint list = glGenLists(1);
208 glNewList(list, GL_COMPILE);
209
210 glEnable(GL_NORMALIZE);
211 glBegin(GL_QUADS);
212
213 static GLfloat logoDiffuseColor[4] = {trolltechGreen.red()/255.0,
214 trolltechGreen.green()/255.0,
215 trolltechGreen.blue()/255.0, 1.0};
216 glMaterialfv(GL_FRONT, GL_DIFFUSE, logoDiffuseColor);
217
218 GLdouble x1 = +0.06;
219 GLdouble y1 = -0.14;
220 GLdouble x2 = +0.14;
221 GLdouble y2 = -0.06;
222 GLdouble x3 = +0.08;
223 GLdouble y3 = +0.00;
224 GLdouble x4 = +0.30;
225 GLdouble y4 = +0.22;
226
227 quad(x1, y1, x2, y2, y2, x2, y1, x1);
228 quad(x3, y3, x4, y4, y4, x4, y3, x3);
229
230 extrude(x1, y1, x2, y2);
231 extrude(x2, y2, y2, x2);
232 extrude(y2, x2, y1, x1);
233 extrude(y1, x1, x1, y1);
234 extrude(x3, y3, x4, y4);
235 extrude(x4, y4, y4, x4);
236 extrude(y4, x4, y3, x3);
237
238 const double Pi = 3.14159265358979323846;
239 const int NumSectors = 200;
240
241 for (int i = 0; i < NumSectors; ++i) {
242 double angle1 = (i * 2 * Pi) / NumSectors;
243 GLdouble x5 = 0.30 * sin(angle1);
244 GLdouble y5 = 0.30 * cos(angle1);
245 GLdouble x6 = 0.20 * sin(angle1);
246 GLdouble y6 = 0.20 * cos(angle1);
247
248 double angle2 = ((i + 1) * 2 * Pi) / NumSectors;
249 GLdouble x7 = 0.20 * sin(angle2);
250 GLdouble y7 = 0.20 * cos(angle2);
251 GLdouble x8 = 0.30 * sin(angle2);
252 GLdouble y8 = 0.30 * cos(angle2);
253
254 quad(x5, y5, x6, y6, x7, y7, x8, y8);
255
256 extrude(x6, y6, x7, y7);
257 extrude(x8, y8, x5, y5);
258 }
259
260 glEnd();
261
262 glEndList();
263 return list;
264}
265
266void GLWidget::quad(GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2,
267 GLdouble x3, GLdouble y3, GLdouble x4, GLdouble y4)
268{
269 glNormal3d(0.0, 0.0, -1.0);
270 glVertex3d(x1, y1, -0.05);
271 glVertex3d(x2, y2, -0.05);
272 glVertex3d(x3, y3, -0.05);
273 glVertex3d(x4, y4, -0.05);
274
275 glNormal3d(0.0, 0.0, 1.0);
276 glVertex3d(x4, y4, +0.05);
277 glVertex3d(x3, y3, +0.05);
278 glVertex3d(x2, y2, +0.05);
279 glVertex3d(x1, y1, +0.05);
280}
281
282void GLWidget::extrude(GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2)
283{
284 qglColor(trolltechGreen.dark(250 + int(100 * x1)));
285
286 glNormal3d((x1 + x2)/2.0, (y1 + y2)/2.0, 0.0);
287 glVertex3d(x1, y1, +0.05);
288 glVertex3d(x2, y2, +0.05);
289 glVertex3d(x2, y2, -0.05);
290 glVertex3d(x1, y1, -0.05);
291}
292
293void GLWidget::normalizeAngle(int *angle)
294{
295 while (*angle < 0)
296 *angle += 360 * 16;
297 while (*angle > 360 * 16)
298 *angle -= 360 * 16;
299}
300
301void GLWidget::createBubbles(int number)
302{
303 for (int i = 0; i < number; ++i) {
304 QPointF position(width()*(0.1 + (0.8*qrand()/(RAND_MAX+1.0))),
305 height()*(0.1 + (0.8*qrand()/(RAND_MAX+1.0))));
306 qreal radius = qMin(width(), height())*(0.0125 + 0.0875*qrand()/(RAND_MAX+1.0));
307 QPointF velocity(width()*0.0125*(-0.5 + qrand()/(RAND_MAX+1.0)),
308 height()*0.0125*(-0.5 + qrand()/(RAND_MAX+1.0)));
309
310 bubbles.append(new Bubble(position, radius, velocity));
311 }
312}
313
314//! [13]
315void GLWidget::animate()
316{
317 QMutableListIterator<Bubble*> iter(bubbles);
318
319 while (iter.hasNext()) {
320 Bubble *bubble = iter.next();
321 bubble->move(rect());
322 }
323 update();
324}
325//! [13]
326
327//! [14]
328void GLWidget::setupViewport(int width, int height)
329{
330 int side = qMin(width, height);
331 glViewport((width - side) / 2, (height - side) / 2, side, side);
332
333 glMatrixMode(GL_PROJECTION);
334 glLoadIdentity();
335 glOrtho(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0);
336 glMatrixMode(GL_MODELVIEW);
337}
338//! [14]
339
340//! [15]
341void GLWidget::drawInstructions(QPainter *painter)
342{
343 QString text = tr("Click and drag with the left mouse button "
344 "to rotate the Qt logo.");
345 QFontMetrics metrics = QFontMetrics(font());
346 int border = qMax(4, metrics.leading());
347
348 QRect rect = metrics.boundingRect(0, 0, width() - 2*border, int(height()*0.125),
349 Qt::AlignCenter | Qt::TextWordWrap, text);
350 painter->setRenderHint(QPainter::TextAntialiasing);
351 painter->fillRect(QRect(0, 0, width(), rect.height() + 2*border),
352 QColor(0, 0, 0, 127));
353 painter->setPen(Qt::white);
354 painter->fillRect(QRect(0, 0, width(), rect.height() + 2*border),
355 QColor(0, 0, 0, 127));
356 painter->drawText((width() - rect.width())/2, border,
357 rect.width(), rect.height(),
358 Qt::AlignCenter | Qt::TextWordWrap, text);
359}
360//! [15]
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