QT 使用OpenGL 进行 3D 绘图

大傻子的文渊阁 2022-11-25 发布于浙江

展开全文

1、gluPerspective 和 gluLookAt 找不到标识符

2、error: LNK2019: 无法解析的外部符号 __imp_glBegin等

一、成果展示：

二、代码展示：

1、main.cpp

#include <QtWidgets/QApplication>
#include "myglwidget.h"
int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	MyGLWidget w;
	w.resize(400, 300);
	w.show();
	return a.exec();
}

2、MyGLWidget.h

#ifndef MYGLWIDGET_H
#define MYGLWIDGET_H
#include <QGLWidget> 
#include <GL/GLU.h>
class MyGLWidget : public QGLWidget
{
    Q_OBJECT
public:
    explicit MyGLWidget(QWidget *parent = 0);
protected:
    void initializeGL();
    void resizeGL(int w, int h);
    void paintGL();
    void keyPressEvent(QKeyEvent *);
    void paintEvent(QPaintEvent *);
    void setupViewport(int w, int h);
private:
    GLfloat translate, xRot, yRot, zRot;
    GLuint textures[3];
signals:
public slots:
};
#endif // MYGLWIDGET_H

3、MyGLWidget.cpp

#include "myglwidget.h"
#include <QKeyEvent>
MyGLWidget::MyGLWidget(QWidget *parent) :
    QGLWidget(parent)
{
    translate = -6.0;
    xRot = yRot = zRot = 0.0;
    // 关闭自动填充背景
    setAutoFillBackground(false);
}
// 初始化环境
void MyGLWidget::initializeGL()
{
}
// 调整视口大小
void MyGLWidget::resizeGL(int w, int h)
{
    setupViewport(w, h);
}
// 渲染场景
void MyGLWidget::paintGL()
{
}
void MyGLWidget::keyPressEvent(QKeyEvent *event)
{
    switch (event->key())
    {
    case Qt::Key_Up :
        xRot += 10;
        break;
    case Qt::Key_Left :
        yRot += 10;
        break;
    case Qt::Key_Right :
        zRot += 10;
        break;
    case Qt::Key_Down :
        translate -= 1;
        if (translate <= -20)
            translate = -1;
        break;
    }
    //updateGL();
    update();
    QGLWidget::keyPressEvent(event);
}
void MyGLWidget::paintEvent(QPaintEvent *)
{
    // 在当前窗口中进行OpenGL的绘制
    makeCurrent();
    // 将模型视图矩阵压入堆栈
    glMatrixMode(GL_MODELVIEW);
    glPushMatrix();
    // 以下是以前initializeGL()函数中的全部内容
    glClearColor(0.0, 0.0, 0.0, 0.0);
    glShadeModel(GL_SMOOTH);
    glClearDepth(1.0);
    glEnable(GL_DEPTH_TEST);
    textures[0] = bindTexture(QPixmap(":/LHCGraphicsView/Resources/side1.png"));
    textures[1] = bindTexture(QPixmap(":/LHCGraphicsView/Resources/side2.png"));
    textures[2] = bindTexture(QPixmap(":/LHCGraphicsView/Resources/side3.png"));
    glEnable(GL_TEXTURE_2D);
    // 该函数中是以前resizeGL()函数中的全部内容
    setupViewport(width(), height());
    // 以下是以前paintGL()函数中的全部内容
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glLoadIdentity();
    glTranslatef(0.0, 0.0, translate);
    glRotatef(xRot, 1.0, 0.0, 0.0);
    glRotatef(yRot, 0.0, 1.0, 0.0);
    glRotatef(zRot, 0.0, 0.0, 1.0);
    glBindTexture(GL_TEXTURE_2D, textures[2]);
    glBegin(GL_QUADS);
    glTexCoord2f(1.0, 0.0);
    glVertex3f(1.0, 1.0, 1.0);
    glTexCoord2f(1.0, 1.0);
    glVertex3f(1.0, 1.0, -1.0);
    glTexCoord2f(0.0, 1.0);
    glVertex3f(-1.0, 1.0, -1.0);
    glTexCoord2f(0.0, 0.0);
    glVertex3f(-1.0, 1.0, 1.0);
    glEnd();
    glBindTexture(GL_TEXTURE_2D, textures[1]);
    glBegin(GL_QUADS);
    glTexCoord2f(1.0, 0.0);
    glVertex3f(1.0, -1.0, 1.0);
    glTexCoord2f(1.0, 1.0);
    glVertex3f(1.0, -1.0, -1.0);
    glTexCoord2f(0.0, 1.0);
    glVertex3f(-1.0, -1.0, -1.0);
    glTexCoord2f(0.0, 0.0);
    glVertex3f(-1.0, -1.0, 1.0);
    glEnd();
    glBindTexture(GL_TEXTURE_2D, textures[0]);
    glBegin(GL_QUADS);
    glTexCoord2f(1.0, 1.0);
    glVertex3f(1.0, 1.0, 1.0);
    glTexCoord2f(0.0, 1.0);
    glVertex3f(-1.0, 1.0, 1.0);
    glTexCoord2f(0.0, 0.0);
    glVertex3f(-1.0, -1.0, 1.0);
    glTexCoord2f(1.0, 0.0);
    glVertex3f(1.0, -1.0, 1.0);
    glEnd();
    // 关闭启用的功能并弹出模型视图矩阵
    glDisable(GL_DEPTH_TEST);
    glDisable(GL_TEXTURE_2D);
    glMatrixMode(GL_MODELVIEW);
    glPopMatrix();
    // 下面是2D绘图的内容
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);
    painter.setBrush(Qt::red);
    painter.drawRect(0, 0, 100, 100);
    painter.end();
}
void MyGLWidget::setupViewport(int w, int h)
{
    glViewport(0, 0, (GLint)w, (GLint)h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(45.0, (GLfloat)w/(GLfloat)h, 0.1, 100.0);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}