1.绘制直线：（程序大体框架不便，每次修改一个glBegin();glEnd();之间的即可）
#include<gl/glut.h>
#include<math.h>
#define GL_PI 3.1415f
void RenderScene(void)
{
GLfloat x,y,z,angle;//存储坐标和角度
glClear(GL_COLOR_BUFFER_BIT);//用当前颜色清除窗口
//保持矩阵状态并进行旋转
glPushMatrix();
//glRotatef(60.0f,1.0f,0.0f,0.0f);
//glRotatef(60.0f,0.0f,1.0f,0.0f);
//对所有剩余的点只调用一次
glBegin(GL_LINES);
z = 0.0f;
for(angle = 0.0f;angle<=GL_PI;angle+=(GL_PI/20.0f))
{
x = 50.0f*sin(angle);
y = 50.0f*cos(angle);
//指定点并稍稍变化z值
glVertex3f(x,y,z);
x = 50.0f*sin(angle+GL_PI);
y = 50.0f*cos(angle+GL_PI);
glVertex3f(x,y,z);
}
glEnd();
//恢复变换
glPopMatrix();
//刷新绘图命令
glutSwapBuffers();
}
//设置渲染状态
void SetupRC(void)
{
//黑色背景
glClearColor(0.0f,0.0f,0.0f,1.0f);
//把绘图颜色置为绿色
glColor3f(0.0f,1.0f,0.0f);
}
void ChangeSzie(GLsizei w,GLsizei h)
{
GLfloat nRange = 100.0f;
//防止被0所除
if(h==0)
h=1;
//把视口设置为窗口的大小
glViewport(0,0,w,h);
//重置投影矩阵堆栈
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
//建立剪裁区域（左，右，底，顶，近，远）
if(w<=h)
glOrtho (-nRange,nRange,-nRange*h/w,nRange*h/w,-nRange,nRange);
else
glOrtho (-nRange*w/h,nRange*w/h,-nRange,nRange,-nRange,nRange);
//重置模型视图矩阵堆栈
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
int main(int argc,char * argv[])
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);
glutInitWindowSize(300,400);
glutCreateWindow("LINES");
glutDisplayFunc(RenderScene);
glutReshapeFunc(ChangeSzie);
SetupRC();
glutMainLoop();
return 0;
}

2.三角扇形：（TAT出了点错误，不管了。）
#include<gl/glut.h>
#include<math.h>
#define GL_PI 3.1415f
void RenderScene(void)
{
GLfloat x,y,angle;//存储坐标和角度
int ipivot=1;
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);//用当前颜色清除窗口
//if(BOutLine)
//glPolygonMode(GL_BACK,GL_LINE);
//else
glPolygonMode(GL_BACK,GL_FILL);
//保持矩阵状态并进行旋转
glPushMatrix();
glRotatef(60.0f,1.0f,0.0f,0.0f);
glRotatef(60.0f,0.0f,1.0f,0.0f);
//对所有剩余的点只调用一次
glBegin(GL_TRIANGLE_FAN);
glVertex3f(0.0f,0.0f,75.0f);
for(angle = 0.0f;angle<=(2.0f*GL_PI)*3.0f;angle+=0.1f)
{
x = 50.0f*sin(angle);
y = 50.0f*cos(angle);
//指定点并稍稍变化z值
if((ipivot %2)==0)
glColor3f(0.0f,1.0f,0.0f);
else
glColor3f(1.0f,0.0f,0.0f);
ipivot++;
glVertex2f(x,y);
}
glEnd();
glBegin(GL_TRIANGLE_FAN);
glVertex2f(0.0f,0.0f);
for(angle=0.0f;angle < (2.0f*GL_PI);angle+=(GL_PI/8.0f))
{
x = 50.0f*sin(angle);
y = 50.0f*cos(angle);
if((ipivot %2)==0)
glColor3f(0.0f,1.0f,0.0f);
else
glColor3f(1.0f,0.0f,0.0f);
ipivot++;
glVertex2f(x,y);
//恢复变换
glPopMatrix();
//刷新绘图命令
glutSwapBuffers();
}
}
//设置渲染状态
void SetupRC(void)
{
//黑色背景
glClearColor(0.0f,0.0f,0.0f,1.0f);
//把绘图颜色置为绿色
glColor3f(0.0f,1.0f,0.0f);
glShadeModel(GL_FLAT);
glFrontFace(GL_CW);
}
void ChangeSzie(GLsizei w,GLsizei h)
{
GLfloat nRange = 100.0f;
//防止被0所除
if(h==0)
h=1;
//把视口设置为窗口的大小
glViewport(0,0,w,h);
//重置投影矩阵堆栈
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
//建立剪裁区域（左，右，底，顶，近，远）
if(w<=h)
glOrtho (-nRange,nRange,-nRange*h/w,nRange*h/w,-nRange,nRange);
else
glOrtho (-nRange*w/h,nRange*w/h,-nRange,nRange,-nRange,nRange);
//重置模型视图矩阵堆栈
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
int main(int argc,char * argv[])
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);
glutInitWindowSize(300,400);
glutCreateWindow("POINT");
glutDisplayFunc(RenderScene);
glutReshapeFunc(ChangeSzie);
SetupRC();
glutMainLoop();
return 0;
}

//glPolygonMode函数用于控制多边形的显示方式。
face这个参数确定显示模式将适用于物体的哪些部分，控制多边形的正面和背面的绘图模式
GL_FRONT表示显示模式将适用于物体的前向面（也就是物体能看到的面）
GL_BACK表示显示模式将适用于物体的后向面（也就是物体上不能看到的面）
GL_FRONT_AND_BACK表示显示模式将适用于物体的所有面
mode这个参数确定选中的物体的面以何种方式显示（显示模式）：
GL_POINT表示只显示顶点，多边形用点显示
GL_LINE表示显示线段，多边形用轮廓显示
GL_FILL表示显示面，多边形采用填充形式

MFC下使用：http://blog.csdn.net/bbppbb/article/details/24314099
Opengl模拟水波：http://johnhany.net/2014/02/water-rendering-with-gerstner-wave/（TAT感觉好帅）