几天前开帖问过怎么画函数图像，说用opengl，一片迷茫，故求opengl画函数图像的代码，最好带注释，谢谢，比如画正弦函数图像

把源码发出来吧

差点这贴要水了，坐等源码and注释出现

[ 本帖最后由 zjsxwc 于 2011-2-4 19:07 编辑 ]

我这只有codeblocks这个编译器，他能用gl之类的，但是用你给的glut会提示undefine，怎么回事，是不是这个glut太老了1998年的，而我的gl是2008年的

晕死，弄了半天还是用不了glut，你们什么ide啊

#include<math.h>
#include<GL/glut.h>
# define fun (sin(x)*(tan(x)+cos(x)))
const int screenWidth = 640;   // width of screen window in pixels
const int screenHeight = 480;  // height of screen window in pixels
GLdouble A,B,C,D; // values used for scaling and shifting

//----------Initialization--------------
void init(void)
{
    glClearColor(1.0,1.0,1.0,0.0); // Set white background color
    glColor3f(0.0f,0.0f,0.0f);    // Drawing color is black
    glPointSize(2.0);             // a ''dot'' is 2 by 2 pixels
    glMatrixMode(GL_PROJECTION);  // Set "camera shape"
    glLoadIdentity();
    gluOrtho2D(0.0,(GLdouble)screenWidth,0.0,(GLdouble)screenHeight);
    // Set values used for scaling and shifting
    A = screenWidth/16.0;
    B = screenWidth/2.0;
    C = D = screenHeight/2.0;

}
// --------Draw the "dot plots" of a function------

GLdouble h(GLdouble x)
{
         return fun;
}

void dotPlots(void)
{
     GLdouble x;
     glClear(GL_COLOR_BUFFER_BIT);       //clear the screen
     glBegin(GL_POINTS);
     for(x=-16.0;x<16.0;x+=0.0001)
     {
    //GLdouble func = exp(-x) * cos(2*3.14159265*x);
               GLdouble func = h(x);
               glVertex2d(A*x+B,(C*func/20.0+D));
      }
      glEnd();
    // Draw a horizontal line
       glBegin(GL_LINES);
       glVertex2i(0,screenHeight/2);
       glVertex2i(screenWidth,screenHeight/2);
       glEnd();
       glBegin(GL_LINES);
       glVertex2i(screenWidth/2,0);
       glVertex2i(screenWidth/2,screenHeight);
       glEnd();
       glFlush(); //send all output to display
}

 main(int argc,char** argv)
{
    glutInit(&argc, argv);  // Initialize the toolkit
    glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);  // Set display mode
    glutInitWindowPosition(100, 150);  // Set window pozition on screen
    glutInitWindowSize(screenWidth, screenHeight);      // Set window size
    glutCreateWindow("Dot plot of a Function"); // Open the screen window
    glutDisplayFunc(dotPlots); // Register redraw function
    init();
    glutMainLoop();  // Go into a perpetual loop
}

原来这么简单啊