[筆記]Polygon

這次計圖考試: 有兩題

poly函式畫的是五角型加上五芒星

rect函式畫的是雙色長方形內有一個菱形...
#include "windows.h"
#include "gl/gl.h"
#include "gl/glut.h"
#include "gl/glu.h"
void init(void)
{
     glClearColor(1.0,1.0,1.0,0.0); //背景顏色:白
     glMatrixMode(GL_PROJECTION); //投影模式
     gluOrtho2D(0.0,300.0,0.0,150.0); //宣告視窗內可見座標系bonder
}



void rect(void)
{
     glClear(GL_COLOR_BUFFER_BIT);
     glColor3f(0.4,0.4,1.0);
     glBegin(GL_POLYGON);
     glVertex2f(0.0,0.0);
     glVertex2f(0.0,150.0);
     glVertex2f(300.0,150.0);
     glEnd();
     glColor3f(1.0,1.0,0.0);
     glBegin(GL_POLYGON);
     glVertex2f(0.0,0.0);
     glVertex2f(300.0,0.0);
     glVertex2f(300.0,150.0);
     glColor3f(1.0,0.0,0.0);
     glEnd();
     glBegin(GL_POLYGON);
     glVertex2f(150.0,150.0);
     glVertex2f(300.0,75.0);
     glVertex2f(150.0,0.0);
     glVertex2f(0.0,75.0);
     glEnd();
     glFlush();    
}



void poly(void)
{
     glClear(GL_COLOR_BUFFER_BIT);
     glColor3f(1.0,0.4,0.4);
     glBegin(GL_POLYGON);
     glVertex2f(50.0,0.0);
     glVertex2f(150.0,0.0);
     glVertex2f(200.0,100.0);
     glVertex2f(100.0,200.0);
     glVertex2f(0.0,100.0);
     glEnd();
     glColor3f(0.4,1.0,0.4);
     glBegin(GL_LINE_STRIP);
      glVertex2f(50.0,0.0);
      glVertex2f(100.0,200.0);
      glVertex2f(150.0,0.0);
      glVertex2f(0.0,100.0);
      glVertex2f(200.0,100.0);
      glVertex2f(50.0,0.0);
     glEnd();
     glFlush();    
}


int main(int argc,char**argv)
{
 glutInit(&argc,argv);//初始GLUT
 glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);//設定顯示模式
 glutInitWindowPosition(100,100);
 glutInitWindowSize(300,150);
 glutCreateWindow("OpenGL Test");

 init();
 glutDisplayFunc(rect);
 glutMainLoop();      
    }