examples/opengl/hellogl/glwidget.cpp

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  41
  42 #include <QtGui>
  43 #include <QtOpenGL>
  44
  45 #include <math.h>
  46
  47 #include "glwidget.h"
  48 #include "qtlogo.h"
  49
  50 #ifndef GL_MULTISAMPLE
  51 #define GL_MULTISAMPLE  0x809D
  52 #endif
  53
  54 //! [0]
  55 GLWidget::GLWidget(QWidget *parent)
  56     : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
  57 {
  58     logo = 0;
  59     xRot = 0;
  60     yRot = 0;
  61     zRot = 0;
  62
  63     qtGreen = QColor::fromCmykF(0.40, 0.0, 1.0, 0.0);
  64     qtPurple = QColor::fromCmykF(0.39, 0.39, 0.0, 0.0);
  65 }
  66 //! [0]
  67
  68 //! [1]
  69 GLWidget::~GLWidget()
  70 {
  71 }
  72 //! [1]
  73
  74 //! [2]
  75 QSize GLWidget::minimumSizeHint() const
  76 {
  77     return QSize(50, 50);
  78 }
  79 //! [2]
  80
  81 //! [3]
  82 QSize GLWidget::sizeHint() const
  83 //! [3] //! [4]
  84 {
  85     return QSize(400, 400);
  86 }
  87 //! [4]
  88
  89 static void qNormalizeAngle(int &angle)
  90 {
  91     while (angle < 0)
  92         angle += 360 * 16;
  93     while (angle > 360 * 16)
  94         angle -= 360 * 16;
  95 }
  96
  97 //! [5]
  98 void GLWidget::setXRotation(int angle)
  99 {
 100     qNormalizeAngle(angle);
 101     if (angle != xRot) {
 102         xRot = angle;
 103         emit xRotationChanged(angle);
 104         updateGL();
 105     }
 106 }
 107 //! [5]
 108
 109 void GLWidget::setYRotation(int angle)
 110 {
 111     qNormalizeAngle(angle);
 112     if (angle != yRot) {
 113         yRot = angle;
 114         emit yRotationChanged(angle);
 115         updateGL();
 116     }
 117 }
 118
 119 void GLWidget::setZRotation(int angle)
 120 {
 121     qNormalizeAngle(angle);
 122     if (angle != zRot) {
 123         zRot = angle;
 124         emit zRotationChanged(angle);
 125         updateGL();
 126     }
 127 }
 128
 129 //! [6]
 130 void GLWidget::initializeGL()
 131 {
 132     qglClearColor(qtPurple.dark());
 133
 134     logo = new QtLogo(this, 64);
 135     logo->setColor(qtGreen.dark());
 136
 137     glEnable(GL_DEPTH_TEST);
 138     glEnable(GL_CULL_FACE);
 139     glShadeModel(GL_SMOOTH);
 140     glEnable(GL_LIGHTING);
 141     glEnable(GL_LIGHT0);
 142     glEnable(GL_MULTISAMPLE);
 143     static GLfloat lightPosition[4] = { 0.5, 5.0, 7.0, 1.0 };
 144     glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
 145 }
 146 //! [6]
 147
 148 //! [7]
 149 void GLWidget::paintGL()
 150 {
 151     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 152     glLoadIdentity();
 153     glTranslated(0.0, 0.0, -10.0);
 154     glRotated(xRot / 16.0, 1.0, 0.0, 0.0);
 155     glRotated(yRot / 16.0, 0.0, 1.0, 0.0);
 156     glRotated(zRot / 16.0, 0.0, 0.0, 1.0);
 157     logo->draw();
 158 }
 159 //! [7]
 160
 161 //! [8]
 162 void GLWidget::resizeGL(int width, int height)
 163 {
 164     int side = qMin(width, height);
 165     glViewport((width - side) / 2, (height - side) / 2, side, side);
 166
 167     glMatrixMode(GL_PROJECTION);
 168     glLoadIdentity();
 169     glOrtho(-0.5, +0.5, -0.5, +0.5, 4.0, 15.0);
 170     glMatrixMode(GL_MODELVIEW);
 171 }
 172 //! [8]
 173
 174 //! [9]
 175 void GLWidget::mousePressEvent(QMouseEvent *event)
 176 {
 177     lastPos = event->pos();
 178 }
 179 //! [9]
 180
 181 //! [10]
 182 void GLWidget::mouseMoveEvent(QMouseEvent *event)
 183 {
 184     int dx = event->x() - lastPos.x();
 185     int dy = event->y() - lastPos.y();
 186
 187     if (event->buttons() & Qt::LeftButton) {
 188         setXRotation(xRot + 8 * dy);
 189         setYRotation(yRot + 8 * dx);
 190     } else if (event->buttons() & Qt::RightButton) {
 191         setXRotation(xRot + 8 * dy);
 192         setZRotation(zRot + 8 * dx);
 193     }
 194     lastPos = event->pos();
 195 }
 196 //! [10]