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40
41 #include <QtGui>
42 #include <QtOpenGL>
43
44 #include <math.h>
45
46 #include "glwidget.h"
47 #include "qtlogo.h"
48
49 #ifndef GL_MULTISAMPLE
50 #define GL_MULTISAMPLE 0x809D
51 #endif
52
53 //! [0]
GLWidget(QWidget * parent)54 GLWidget::GLWidget(QWidget *parent)
55 : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
56 {
57 logo = 0;
58 xRot = 0;
59 yRot = 0;
60 zRot = 0;
61
62 qtGreen = QColor::fromCmykF(0.40, 0.0, 1.0, 0.0);
63 qtPurple = QColor::fromCmykF(0.39, 0.39, 0.0, 0.0);
64 }
65 //! [0]
66
67 //! [1]
~GLWidget()68 GLWidget::~GLWidget()
69 {
70 }
71 //! [1]
72
73 //! [2]
minimumSizeHint() const74 QSize GLWidget::minimumSizeHint() const
75 {
76 return QSize(50, 50);
77 }
78 //! [2]
79
80 //! [3]
sizeHint() const81 QSize GLWidget::sizeHint() const
82 //! [3] //! [4]
83 {
84 return QSize(400, 400);
85 }
86 //! [4]
87
qNormalizeAngle(int & angle)88 static void qNormalizeAngle(int &angle)
89 {
90 while (angle < 0)
91 angle += 360 * 16;
92 while (angle > 360 * 16)
93 angle -= 360 * 16;
94 }
95
96 //! [5]
setXRotation(int angle)97 void GLWidget::setXRotation(int angle)
98 {
99 qNormalizeAngle(angle);
100 if (angle != xRot) {
101 xRot = angle;
102 emit xRotationChanged(angle);
103 updateGL();
104 }
105 }
106 //! [5]
107
setYRotation(int angle)108 void GLWidget::setYRotation(int angle)
109 {
110 qNormalizeAngle(angle);
111 if (angle != yRot) {
112 yRot = angle;
113 emit yRotationChanged(angle);
114 updateGL();
115 }
116 }
117
setZRotation(int angle)118 void GLWidget::setZRotation(int angle)
119 {
120 qNormalizeAngle(angle);
121 if (angle != zRot) {
122 zRot = angle;
123 emit zRotationChanged(angle);
124 updateGL();
125 }
126 }
127
128 //! [6]
initializeGL()129 void GLWidget::initializeGL()
130 {
131 qglClearColor(qtPurple.dark());
132
133 logo = new QtLogo(this, 64);
134 logo->setColor(qtGreen.dark());
135
136 glEnable(GL_DEPTH_TEST);
137 glEnable(GL_CULL_FACE);
138 glShadeModel(GL_SMOOTH);
139 glEnable(GL_LIGHTING);
140 glEnable(GL_LIGHT0);
141 glEnable(GL_MULTISAMPLE);
142 static GLfloat lightPosition[4] = { 0.5, 5.0, 7.0, 1.0 };
143 glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
144 }
145 //! [6]
146
147 //! [7]
paintGL()148 void GLWidget::paintGL()
149 {
150 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
151 glLoadIdentity();
152 glTranslatef(0.0, 0.0, -10.0);
153 glRotatef(xRot / 16.0, 1.0, 0.0, 0.0);
154 glRotatef(yRot / 16.0, 0.0, 1.0, 0.0);
155 glRotatef(zRot / 16.0, 0.0, 0.0, 1.0);
156 logo->draw();
157 }
158 //! [7]
159
160 //! [8]
resizeGL(int width,int height)161 void GLWidget::resizeGL(int width, int height)
162 {
163 int side = qMin(width, height);
164 glViewport((width - side) / 2, (height - side) / 2, side, side);
165
166 glMatrixMode(GL_PROJECTION);
167 glLoadIdentity();
168 #ifdef QT_OPENGL_ES_1
169 glOrthof(-0.5, +0.5, -0.5, +0.5, 4.0, 15.0);
170 #else
171 glOrtho(-0.5, +0.5, -0.5, +0.5, 4.0, 15.0);
172 #endif
173 glMatrixMode(GL_MODELVIEW);
174 }
175 //! [8]
176
177 //! [9]
mousePressEvent(QMouseEvent * event)178 void GLWidget::mousePressEvent(QMouseEvent *event)
179 {
180 lastPos = event->pos();
181 }
182 //! [9]
183
184 //! [10]
mouseMoveEvent(QMouseEvent * event)185 void GLWidget::mouseMoveEvent(QMouseEvent *event)
186 {
187 int dx = event->x() - lastPos.x();
188 int dy = event->y() - lastPos.y();
189
190 if (event->buttons() & Qt::LeftButton) {
191 setXRotation(xRot + 8 * dy);
192 setYRotation(yRot + 8 * dx);
193 } else if (event->buttons() & Qt::RightButton) {
194 setXRotation(xRot + 8 * dy);
195 setZRotation(zRot + 8 * dx);
196 }
197 lastPos = event->pos();
198 }
199 //! [10]
200