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<Point3f> pointListt; //double gVertexNum; //double gEdgeNum; int gVertexNum; int gEdgeNum; GlutWin *win; using namespace std; void myDisplay(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); cout << "正在绘制。。" << endl; cout << pointListt.at(0).GetParamX()<< endl; cout << pointListt.at(1).GetParamY()<< endl; cout << pointListt.at(2).GetParamZ() << endl; /*glBegin(GL_TRIANGLES); glVertex3f(0.032027, 0.056575, -0.050364); glVertex3f(0.031798, 0.056575, -0.050338); glVertex3f(0.032377, 0.056564, -0.050338); glEnd();*/ static double theta = 0; theta += 0.05; glColor3d(1, 0.5, 1); glRotated(theta, 0, 1, 0); glBegin(GL_TRIANGLES); //for (int i = 0; i < gVertexNum - 2; i++) //{ // glVertex3f(pointListt.at(i+0).GetParamX(), pointListt.at(i+0).GetParamY(), pointListt.at(i+0).GetParamZ()); // glVertex3f(pointListt.at(i+1).GetParamX(), pointListt.at(i+1).GetParamY(), pointListt.at(i+1).GetParamZ()); // glVertex3f(pointListt.at(i+2).GetParamX(), pointListt.at(i+2).GetParamY(), pointListt.at(i+2).GetParamZ()); //} for (vector<Point3f>::iterator it = pointListt.begin(); it != pointListt.end(); it++) { glVertex3f(it->GetParamX(),it->GetParamY(),it->GetParamZ()); /*glVertex3f( (it+1)->GetParamX(), (it+1)->GetParamY(), (it+1)->GetParamZ() ) ; glVertex3f( (it+2)->GetParamX(), (it+2)->GetParamY(), (it+2)->GetParamZ() );*/ } glEnd(); glFlush(); glutSwapBuffers(); } void myReshape(GLsizei width, GLsizei height) { const float ar = (float)width / (GLfloat)height; if (height == 0) { height = 1; } //投影->视口变换 glViewport(0, 0, width, height); glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // 黑 glMatrixMode(GL_PROJECTION); glLoadIdentity(); #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 glScalef(10.0, 10.0, 10.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } static void myidle() { glutPostRedisplay(); } int main(int argc, char *argv[]) { ReadTxtFile DPoint; cout << "加载数据中..." << endl; pointListt = DPoint.Get3DPoint(); // if (pointListt.empty()) { cerr << "加载数据为空" << endl; } gVertexNum = DPoint.getVertexNum(); //gVertexNum = DPoint.getVertexNum(); //gEdgeNum = DPoint.getEdgeNum(); //cout << "顶点个数:" << gVertexNum << endl; //cout << "面片个数:" << gEdgeNum << endl; cout << "加载已运行" << DPoint.getLoadTime() << "s" << endl; win = new GlutWin(600, 800,100, 100, GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH, FILENAME); glutDisplayFunc(myDisplay); glutReshapeFunc(myReshape); glutIdleFunc(myidle); glutMainLoop(); glEnable(GL_DEPTH_TEST); glDepthFunc(GL_LESS); //如果输入的深度值小于参考值，则通过 glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glEnable(GL_COLOR_MATERIAL); //开启颜色追踪 delete win; return 0; }

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 <iostream> #include <time.h> #include <string> #include <fstream> #include <sstream> #include <vector> #include "Point3f.h" #if 0 #define FILENAME "bunny.txt" #else #define FILENAME "dragon.txt" #endif #define BUFFERLINE 50 //读取一行大小 using namespace std; class ReadTxtFile { public: ReadTxtFile(); ~ReadTxtFile(); vector<Point3f> Get3DPoint(const char *fileName); vector<Point3f> Get3DPoint(); /*double getVertexNum(); double getEdgeNum(); double formatConvert(char *m_line); */ int getVertexNum() const; int getEdgeNum() const; time_t getLoadTime() const; inline void closeFile() { m_fin->clear(); m_fin->close(); } private: string m_x,m_y,m_z; time_t m_t1; time_t m_t2; //const char * m_VertexNumchar; //const char * m_EdgeNumchar; //const char * m_Numchar; //用于格式转换 //double m_Num; //double m_VertexNum; //顶点数 //double m_EdgeNum; //面片数 // int m_vertNum; int m_triNum; ifstream *m_fin; char m_line[BUFFERLINE]; //读一行所用数组 vector<Point3f> m_pointList; //vector<float> 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<Point3f> ReadTxtFile::Get3DPoint(const char *fileName) { int i = 0; int vertNum; int triNum; float x, y, z; *m_fin >> vertNum ; *m_fin >> triNum; time(&m_t1); for (int i = 0; i < vertNum; i++) { *m_fin >> x >> y >> z; m_pointList.push_back(Point3f(x, y, z)); } time(&m_t2); //读取文件 //time(&m_t1); //while (m_fin->getline(m_line, sizeof(m_line))) //{ // if (i < 1) // { // m_VertexNum = formatConvert(m_line); // i += 1; // continue; // } // if (i == 1) // { // m_EdgeNum = formatConvert(m_line); // i += 1; // continue; // } // stringstream word(m_line); // word >> m_x; // word >> m_y; // word >> m_z; // const char * xChar = m_x.c_str(); // const char * yChar = m_y.c_str(); // const char * zChar = m_z.c_str(); // m_pointList.push_back(Point3f(atof(xChar), atof(yChar), atof(zChar))); // //pointList.at(i - 2).SetParam(atof(xChar), atof(xChar), atof(xChar)); // i++; //} //time(&m_t2); closeFile(); return m_pointList; } vector<Point3f> ReadTxtFile::Get3DPoint() { int i = 0; float x, y, z; *m_fin >> m_vertNum; *m_fin >> m_triNum; time(&m_t1); for (int i = 0; i < m_vertNum; i++) { *m_fin >> x >> y >> z; m_pointList.push_back(Point3f(x, y, z)); } time(&m_t2); 读取文件 //time(&m_t1); //while (m_fin->getline(m_line, sizeof(m_line))) //{ // if (i < 1) // { // m_VertexNum = formatConvert(m_line); // i += 1; // continue; // } // if (i == 1) // { // m_EdgeNum = formatConvert(m_line); // i += 1; // continue; // } // stringstream word(m_line); // word >> m_x; // word >> m_y; // word >> m_z; // const char * xChar = m_x.c_str(); // const char * yChar = m_y.c_str(); // const char * zChar = m_z.c_str(); // m_pointList.push_back(Point3f(atof(xChar), atof(yChar), atof(zChar))); // //pointList.at(i - 2).SetParam(atof(xChar), atof(xChar), atof(xChar)); // i++; //} //time(&m_t2); closeFile(); return m_pointList; } //double ReadTxtFile::getVertexNum() //{ // return m_VertexNum; //} // //double ReadTxtFile::getEdgeNum() //{ // return m_EdgeNum; //} int ReadTxtFile::getVertexNum() const { return m_vertNum; } int ReadTxtFile::getEdgeNum() const { return m_triNum; } time_t ReadTxtFile::getLoadTime() const { return (m_t2 - m_t1); } //double ReadTxtFile::formatConvert(char *m_line) //{ // string s(&m_line[0], &m_line[strlen(m_line)]); //char *[]转string转char* // m_Numchar = s.c_str(); // m_Num = atof(m_Numchar); // // return m_Num; //}

绘制窗口

GlutWin.h #pragma once #include <windows.h> #include "freeglut.h" //Glut初始化 class GlutWin { public: GlutWin(int windowHeight, int windowWidth,int windowPosX, int windowPosY, unsigned int displayMode,const char * windowTitle); ~GlutWin() {}; private: const char * windowTitle; int windowHeight, windowWidth; int windowPosX, windowPosY; int windowID; unsigned int displayMode; bool fullScreen; }; 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