opengl画曲线怎么不显示呢?

mirroatl234 2015-02-26 04:45:02



#include "stdafx.h"

#define GLUT_DISABLE_ATEXIT_HACK  

#include<gl/GLUT.H>  

#include<gl/GLU.H>  

#include<gl/GL.H>  

#include <math.h>



#pragma comment(lib,"GLU32.LIB")

#pragma comment(lib,"OPENGL32.LIB")

#pragma comment(lib,"glew32.lib")

#pragma comment(lib,"glut32.LIB")



GLint nNumPoints = 3;



GLfloat ctrlPoints[3][3][3]= {

	{

		{-4.0f, 0.0f, 4.0f},    

		{-2.0f, 4.0f, 4.0f},    

		{4.0f, 0.0f, 4.0f }

	},



	{

		{-4.0f, 0.0f, 0.0f},    

		{-2.0f, 4.0f, 0.0f},    

		{4.0f, 0.0f, 0.0f }

	},



	{

		{-4.0f, 0.0f, -4.0f},    

		{-2.0f, 4.0f, -4.0f},    

		{4.0f, 0.0f, -4.0f }

	}

}; 





void myDisplay(void)  

{  

	// Clear the window with current clearing color 

	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	// 保存模型视图矩阵  

	glMatrixMode(GL_MODELVIEW);

	glPushMatrix(); 

	//旋转一定的角度方便观察  

	glRotatef(45.0f, 0.0f, 1.0f, 0.0f);

	glRotatef(60.0f, 1.0f, 0.0f, 0.0f);



	glColor3f(0.0f, 0.0f, 1.0f); //设置映射方式，只需要设置一次可以在SetupRC中调用。  

	glMap2f(GL_MAP2_VERTEX_3, //生成的数据类型  

		0.0f, // u的下界 

		10.0f, //u的上界  

		3, //数据中点的间隔  

		3, //u方向上的阶  

		0.0f, //v的下界  

		10.0f, //v的上界  

		9, // 控制点之间的间隔  

		3, // v方向上的阶  

		&ctrlPoints[0][0][0]); //控制点数组 

	//启用求值器  

	glEnable(GL_MAP2_VERTEX_3); 

	//从0到10映射一个包含10个点的网格  

	glMapGrid2f(10,0.0f,10.0f,10,0.0f,10.0f); 

	// 计算网格  

	glEvalMesh2(GL_LINE,0,10,0,10); 

	//画控制点  

	int i,j;    

	glColor3f(1.0f, 0.0f, 0.0f); //把点放大一点，看得更清楚  glPointSize(5.0f);

	glBegin(GL_POINTS); 

	for(i = 0; i < nNumPoints; i++)

		for(j = 0; j < 3; j++)

			glVertex3fv(ctrlPoints[i][j]);

	glEnd();;



	glPopMatrix();



	glutSwapBuffers();

}  



int main(int argc,char *argv[])  

{  

    glutInit(&argc,argv);  

    glutInitDisplayMode(GLUT_RGB|GLUT_SINGLE);  

    glutInitWindowPosition(100,100);  

    glutInitWindowSize(400,400);  

    glutCreateWindow("我的第一个OpenGL程序");  

    glutDisplayFunc(&myDisplay);  

    glutMainLoop();//进行消息循环  

    return 0;  

}