OpenGL_point

#include <stdio.h>
#include <stdlib.h>
#include <GL\glut.h>

void WindowSize(int , int );            //負責視窗及繪圖內容的比例
void Keyboard(unsigned char , int, int );   //獲取鍵盤輸入
void Display(float x,float y,float z);                     //描繪

int main(int argc, char** argv)
{
   glutInit(&argc, argv);
   glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
   glutInitWindowSize(400,400);
   glutInitWindowPosition(600,80);
   glutCreateWindow("這裡是視窗標題");
   glutReshapeFunc(WindowSize);
   glutKeyboardFunc(Keyboard);
   glutDisplayFunc(Display);

   Display(1,1,0);

   glutMainLoop();

   return 0;
}

void Display(float x,float y,float z)
{
   glClearColor(1.0, 1.0, 1.0, 1.0);   //用白色塗背景

   glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT);
   
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
   gluLookAt(0,1,0,1,1,0,0,1,1);   //視線的座標及方向
   glPointSize(10);
   glBegin(GL_POINTS);

   glColor3f( 1, 0, 0);
   glVertex3f(x,y,z);

   //glColor3f( 1, 0, 0);
   //glVertex3f(1,2,0);

   glEnd();

   glutSwapBuffers();
}

void Keyboard(unsigned char key, int x, int y)
{
   printf("你所按按鍵的碼是%x\t此時視窗內的滑鼠座標是(%d,%d)\n", key, x, y);
}

void WindowSize(int w, int h)
{
   printf("目前視窗大小為%dX%d\n",w,h);
   glViewport(0, 0, w, h);            //當視窗長寬改變時，畫面也跟著變
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   glOrtho(-10,10,-10,10,-10,10);      //正交投影
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
}