OpenGL绘制函数

#include     // Windows的头文件

#include         // OpenGL32库的头文件
#include         // GLu32库的头文件
#include     // GLaux库的头文件
#include     // Glut库头文件

#include 

#pragma comment( lib, "opengl32.lib")    // OpenGL32连接库
#pragma comment( lib, "glu32.lib")        // GLu32连接库
#pragma comment( lib, "glaux.lib")        // GLaux连接库
#pragma comment( lib, "glut.lib")        // Glut链接库

int screenWidth=640;
int screenHeight=480;
GLdouble A,B,C,D;                //比例变换平移值

void myInit()
{
    glClearColor(1.0,1.0,1.0,0.0);            //设置背景颜色为亮白
    glColor3f(0.0f,0.0f,0.0f);                //设置绘图颜色为黑色
    glPointSize(4.0);                        //设置点的大小为4*4像素
    glMatrixMode(GL_PROJECTION);            //设置合适的矩阵
    glLoadIdentity();                        
    gluOrtho2D(0.0,screenWidth,0.0,screenHeight);
    A=screenWidth/4.0;
    B=0.0;
    C=D=screenHeight/2.0;
}


GLdouble func(GLdouble x)
{
return exp(-x)*cos(2*3.1415926*x);
}

void myDisplay()
{
    glClear(GL_COLOR_BUFFER_BIT);
    glBegin(GL_POINTS);

for(GLdouble x=0;x<2*3.14159;x+=0.00025)
            glVertex2d(A*x+B,C*func(x)+D);

    glEnd();
    glFlush();

}

void main(int argc, char **argv)
{
    glutInit(&argc,argv);                        //初始化工具包    
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);//设置显示模式
    glutInitWindowSize(640,480);                //设置窗口大小
    glutInitWindowPosition(100,150);            //设置窗口在屏幕上的位置
    glutCreateWindow("my first attempt");        //打开屏幕窗口

//注册回调函数
    glutDisplayFunc(myDisplay);

    myInit();
    glutMainLoop();                                //进入循环
}

转载于:https://www.cnblogs.com/tiandsp/archive/2012/01/21/2328636.html