#include <QtGui>
#include <QtOpenGL>
#include <math.h>
#include "glwidget.h"
#include "qtlogo.h"
#ifndef GL_MULTISAMPLE
#define GL_MULTISAMPLE 0x809D
#endif
//! [0]
GLWidget::GLWidget(QWidget *parent)
: QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
{
logo = 0;
xRot = 0;
yRot = 0;
zRot = 0;
qtGreen = QColor::fromCmykF(0.40, 0.0, 1.0, 0.0);
qtPurple = QColor::fromCmykF(0.39, 0.39, 0.0, 0.0);
}
//! [0]
//! [1]
GLWidget::~GLWidget()
{
}
//! [1]
//! [2]
QSize GLWidget::minimumSizeHint() const
{
return QSize(50, 50);
}
//! [2]
//! [3]
QSize GLWidget::sizeHint() const
//! [3] //! [4]
{
return QSize(400, 400);
}
//! [4]
static void qNormalizeAngle(int &angle)
{
while (angle < 0)
angle += 360 * 16;
while (angle > 360 * 16)
angle -= 360 * 16;
}
//! [5]
void GLWidget::setXRotation(int angle)
{
qNormalizeAngle(angle);
if (angle != xRot) {
xRot = angle;
emit xRotationChanged(angle);
updateGL();
}
}
//! [5]
void GLWidget::setYRotation(int angle)
{
qNormalizeAngle(angle);
if (angle != yRot) {
yRot = angle;
emit yRotationChanged(angle);
updateGL();
}
}
void GLWidget::setZRotation(int angle)
{
qNormalizeAngle(angle);
if (angle != zRot) {
zRot = angle;
emit zRotationChanged(angle);
updateGL();
}
}
//! [6]
void GLWidget::initializeGL()
{
qglClearColor(qtPurple.dark());
logo = new QtLogo(this, 64);
logo->setColor(qtGreen.dark());
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glShadeModel(GL_SMOOTH);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_MULTISAMPLE);
static GLfloat lightPosition[4] = { 0.5, 5.0, 7.0, 1.0 };
glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
}
//! [6]
//! [7]
void GLWidget::paintGL()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(0.0, 0.0, -10.0);
glRotatef(xRot / 16.0, 1.0, 0.0, 0.0);
glRotatef(yRot / 16.0, 0.0, 1.0, 0.0);
glRotatef(zRot / 16.0, 0.0, 0.0, 1.0);
logo->draw();
}
//! [7]
//! [8]
void GLWidget::resizeGL(int width, int height)
{
int side = qMin(width, height);
glViewport((width - side) / 2, (height - side) / 2, side, side);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
#ifdef QT_OPENGL_ES_1
glOrthof(-0.5, +0.5, -0.5, +0.5, 4.0, 15.0);
#else
glOrtho(-0.5, +0.5, -0.5, +0.5, 4.0, 15.0);
#endif
glMatrixMode(GL_MODELVIEW);
}
//! [8]
//! [9]
void GLWidget::mousePressEvent(QMouseEvent *event)
{
lastPos = event->pos();
}
//! [9]
//! [10]
void GLWidget::mouseMoveEvent(QMouseEvent *event)
{
int dx = event->x() - lastPos.x();
int dy = event->y() - lastPos.y();
if (event->buttons() & Qt::LeftButton) {
setXRotation(xRot + 8 * dy);
setYRotation(yRot + 8 * dx);
} else if (event->buttons() & Qt::RightButton) {
setXRotation(xRot + 8 * dy);
setZRotation(zRot + 8 * dx);
}
lastPos = event->pos();
}
//! [10]
. Il problema è quando provo ad eseguire il codice, il compilatore mi da il seguente output, con relativi errori, in particolare non mi trova alcune variabili di OpenGL (esempio: GL_SMOOTH).
