OpenGL之C++实现读取txt文件并显示
读取32M的文件需要10秒左右，使用c语言会快很多。代码有些繁琐。
绘制
dragonShow.cpp
#include "freeglut.h"
#include "ReadTxtFIle.h"
#include "Point3f.h"
#include "GlutWin.h"
#pragma comment(lib,"freeglut.lib")
vector存储读到的点
Point3f.h
#pragma once
#include "freeglut.h"
//-----------------------------顶点结构体----------------------------------
struct Vertex //顶点结构
{
Vertex() {}
Vertex(float x, float y, float z)
{
_x = x; _y = y; _z = z;
}
float _x, _y, _z;
};
class Point3f
{
public:
Point3f();
Point3f(float _x, float _y, float _z);
int SetParam(float _x, float _y, float _z);
GLfloat GetParamX();
GLfloat GetParamY();
GLfloat GetParamZ();
inline Vertex IVertex()
{
return Vertex(x, y, z);
}
private:
float x, y, z;
};Point3f.cpp
#pragma once
#include"Point3f.h"
Point3f::Point3f() :x(0), y(0), z(0)
{
}
Point3f::Point3f(float _x, float _y, float _z) : x(_x), y(_y), z(_z)
{
}
int Point3f::SetParam(float _x, float _y, float _z)
{
x = _x;
y = _y;
z = _z;
return 0;
}
GLfloat Point3f::GetParamX()
{
return x;
}
GLfloat Point3f::GetParamY()
{
return y;
}
GLfloat Point3f::GetParamZ()
{
return z;
}读取文件
#pragma once
#include m_pointList;
};ReadTxtFIle.cpp
#pragma once
#include "ReadTxtFIle.h"
ReadTxtFile::ReadTxtFile() :m_x(""), m_y(""), m_z(""), m_vertNum(NULL), m_triNum(NULL)
{
*m_line = { 0 };
m_fin = new ifstream(FILENAME, ios::in);
}
ReadTxtFile::~ReadTxtFile()
{
}
vector绘制窗口
GlutWin.h
#pragma once
#include GlutWin.cpp
#include "GlutWin.h"
GlutWin::GlutWin(int windowHeight, int windowWidth,int windowPosX, int windowPosY,
unsigned int displayMode,const char * windowTitle)
{
windowTitle = windowTitle;
windowHeight = windowHeight;
windowWidth = windowWidth;
windowPosX = windowPosX;
windowPosY = windowPosY;
displayMode = displayMode;
fullScreen = false;
char cmd_line[8];
char * argv[1];
argv[0] = cmd_line;
int argc = 1;
glutInit(&argc, argv);
glutInitWindowSize(windowWidth, windowHeight);
glutInitWindowPosition(windowPosX, windowPosY);
glutInitDisplayMode(displayMode);
windowID = glutCreateWindow(windowTitle);
const float ar = (float)windowWidth / (GLfloat)windowHeight;
#if 0
glOrtho(-1.0, 1.0, -1.0 / ar, 1.0 / ar, -1.0, 1.0);
#else
gluPerspective(45.0, ar, 0.1, 100.0);
gluLookAt(0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
#endif // 透视投影、平行投影
glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // 黑
glViewport(0, 0, windowWidth, windowHeight);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glScalef(10.0, 10.0, 10.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity() ;
}三维点：http://download.csdn.net/detail/tingzhushaohua/9814466