// Draw the "dot plots" of a function
//P52 in <Computer Graphics Using OpenGL(Second Edition)>

#include<math.h>
#include<GL/glut.h>

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/4.0;
    B = 0.0;
    C = D = screenHeight/2.0;

}
// --------Draw the "dot plots" of a function------
void dotPlots(void)
{GLdouble x;
    glClear(GL_COLOR_BUFFER_BIT);       //clear the screen
    glBegin(GL_POINTS);
for(x=0;x<4.0;x+=0.005)
  {
    //GLdouble func = exp(-x) * cos(2*3.14159265*x);
GLdouble func = sin(x*2);
    glVertex2d(A*x+B,C*func+D);
  }
    glEnd();
    // Draw a horizontal line
    glBegin(GL_LINES);
    glVertex2i(0,screenHeight/2);
    glVertex2i(screenWidth,screenHeight/2);
    glEnd();
    glFlush(); //send all output to display
}

void 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
}

再往高点，输入一段C语言函数，输出一个3D函数图像

很给里

晕死，弄了半天还是用不了glut，你们什么ide啊

你们什么ide？？？？VC6啊

俺也学习一下.

VS2008也不错吧

我己经标明出VS2010,楼主没有看清楚吗，刚才笔误

[ 本帖最后由 点线面 于 2011-2-5 23:22 编辑 ]

写VS2010 ？？？？这么彪悍？

#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