openglwidget.h

#ifndef OPENGLWIDGET_H
#define OPENGLWIDGET_H

#include <QDateTime>
#include <QDebug>
#include <QMatrix4x4>
#include <QMouseEvent>
#include <QOpenGLBuffer>
#include <QOpenGLFunctions>
#include <QOpenGLShaderProgram>
#include <QOpenGLVertexArrayObject>
#include <QOpenGLWidget>
#include <QTime>
#include <QtMath>

// 引入GDAL头文件
#include "ogrsf_frmts.h"
#include "renderlayer.h"

class OpenGLWidget : public QOpenGLWidget, protected QOpenGLFunctions {
  Q_OBJECT
 public:
  explicit OpenGLWidget(QWidget *parent);

  void initializeGL() override;

  void paintGL() override;

  void mousePressEvent(QMouseEvent *event);

  void mouseReleaseEvent(QMouseEvent *event);

  void wheelEvent(QWheelEvent *event);

  void keyPressEvent(QKeyEvent *event);

  void mouseMoveEvent(QMouseEvent *event);

  QVector<RenderLayer *> layers;
  QRectF *boundary;

  bool displayMode = false;
  float displaySpeed = 1;

  bool gameMode = false;

  void rotate(bool checked);

  float rotateHeight = 0;

 private:
  QOpenGLBuffer m_vertex;
  QOpenGLVertexArrayObject m_object;
  QOpenGLShaderProgram *m_program;

  QVector4D pressVec4;
  QVector4D lastVec4;

  QMatrix4x4 projection;
  QMatrix4x4 rotateVec;

  QMatrix4x4 camera;
  QVector3D cameraPos;
  QVector3D cameraTarget;

  float pitch = .0f;
  float yaw = -90.0f;
  float span = 0;
  QVector3D worldUp;
  QVector3D front;
  QVector3D right;
  QVector3D up;

  QMatrix4x4 perspective;
  QMatrix4x4 moveMatrix;

  QVector4D cursorToView(QMouseEvent *event);

  void cursorToViewBoundary(QMouseEvent *event, QVector4D *leftTop,
                            QVector4D *rightBottom, float offset = 2);

  QVector4D cursorToView(QWheelEvent *event);

  QVector4D viewToWorld(QVector4D point);
};

#endif  // OPENGLWIDGET_H