第一个复制成功的Qt Demo(续)

4.修改tetrahedron.h代码

此处一定要

#include <QtGui/QtGui>

#include <QtOpenGL/QtOpenGL>

不知道为何，如果要使用QGLWidget 就要这两个头文件

#ifndef TETRAHEDRON_H
#define TETRAHEDRON_H

#include <QtGui/QtGui>
#include <QtOpenGL/QtOpenGL>
#include <QColor>
#include <QPoint>


class Tetrahedron : public QGLWidget
{
    Q_OBJECT

public:
    Tetrahedron(QWidget *parent = 0);

protected:
    void initializeGL();
    void resizeGL(int width, int height);
    void paintGL();
    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    void mouseDoubleClickEvent(QMouseEvent *event);

private:
    void draw();
    int faceAtPosition(const QPoint &pos);
    GLfloat rotationX;
    GLfloat rotationY;
    GLfloat rotationZ;
    QColor faceColors[4];
    QPoint lastPos;
};


#endif // TETRAHEDRON_H

5.修改tetrahedron.cpp代码

#include <QtGui/QtGui>
#include <QtOpenGL/QtOpenGL>
#include <tetrahedron.h>

Tetrahedron::Tetrahedron(QWidget *parent)
: QGLWidget(parent)
{
setFormat(QGLFormat(QGL::DoubleBuffer | QGL::DepthBuffer));
rotationX = -21.0;
rotationY = -57.0;
rotationZ = 0.0;
faceColors[0] = Qt::red;
faceColors[1] = Qt::green;
faceColors[2] = Qt::blue;
faceColors[3] = Qt::yellow;
}

void Tetrahedron::initializeGL()
{
    qglClearColor(Qt::black);
    glShadeModel(GL_FLAT);
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_CULL_FACE);
}

void Tetrahedron::resizeGL(int width, int height)
{
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
GLfloat x = GLfloat(width) / height;
glFrustum(-x, x, -1.0, 1.0, 4.0, 15.0);
glMatrixMode(GL_MODELVIEW);
}

void Tetrahedron::paintGL()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
draw();
}

void Tetrahedron::draw()
{
static const GLfloat P1[3] = { 0.0, -1.0, +2.0 };
static const GLfloat P2[3] = { +1.73205081, -1.0, -1.0 };
static const GLfloat P3[3] = { -1.73205081, -1.0, -1.0 };
static const GLfloat P4[3] = { 0.0, +2.0, 0.0 };
static const GLfloat * const coords[4][3] = {
{ P1, P2, P3 }, { P1, P3, P4 }, { P1, P4, P2 }, { P2, P4, P3 }
};
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0, 0.0, -10.0);
glRotatef(rotationX, 1.0, 0.0, 0.0);
glRotatef(rotationY, 0.0, 1.0, 0.0);
glRotatef(rotationZ, 0.0, 0.0, 1.0);
for (int i = 0; i < 4; ++i) {
glLoadName(i);
glBegin(GL_TRIANGLES);
qglColor(faceColors[i]);
for (int j = 0; j < 3; ++j) {
glVertex3f(coords[i][j][0], coords[i][j][1],
coords[i][j][2]);
}
glEnd();
}
}

void Tetrahedron::mousePressEvent(QMouseEvent *event)
{
lastPos = event->pos();
}

void Tetrahedron::mouseMoveEvent(QMouseEvent *event)
{
GLfloat dx = GLfloat(event->x() - lastPos.x()) / width();
GLfloat dy = GLfloat(event->y() - lastPos.y()) / height();
if (event->buttons() & Qt::LeftButton) {
rotationX += 180 * dy;
rotationY += 180 * dx;
updateGL();
} else if (event->buttons() & Qt::RightButton) {
rotationX += 180 * dy;
rotationZ += 180 * dx;
updateGL();
}
lastPos = event->pos();
}

void Tetrahedron::mouseDoubleClickEvent(QMouseEvent *event)
{
int face = faceAtPosition(event->pos());
if (face != -1) {
QColor color = QColorDialog::getColor(faceColors[face], this);
if (color.isValid()) {
faceColors[face] = color;
updateGL();
}
}
}

int Tetrahedron::faceAtPosition(const QPoint &pos)
{
const int MaxSize = 512;
GLuint buffer[MaxSize];
GLint viewport[4];
glGetIntegerv(GL_VIEWPORT, viewport);
glSelectBuffer(MaxSize, buffer);
glRenderMode(GL_SELECT);
glInitNames();
glPushName(0);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
gluPickMatrix(GLdouble(pos.x()), GLdouble(viewport[3] - pos.y()),
5.0, 5.0, viewport);
GLfloat x = GLfloat(width()) / height();
glFrustum(-x, x, -1.0, 1.0, 4.0, 15.0);
draw();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
if (!glRenderMode(GL_RENDER))
return -1;
return buffer[3];
}

代码部分就好了，不过还有一个很重要的地方需要修改

6.修改.pro文件

QT += opengl

这是使用OpenGL需要的地方，之前我估计就是这个东西一直不能成功，哎~~~