OpenGL简单图形绘制

最新推荐文章于 2024-03-20 18:30:23 发布

原创最新推荐文章于 2024-03-20 18:30:23 发布 · 689 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#opengl

opengl 专栏收录该内容

30 篇文章

订阅专栏

#include "stdafx.h"
#include <math.h>
const int n=50;
const GLfloat R=1;
const GLfloat Pi=3.1415926f;
const GLfloat factor = 0.1f;
static int day=200;
void myDisplay()
{
    int i;
    //glClear(GL_COLOR_BUFFER_BIT);
    ////绘制一个矩形
    //glRectf(-0.5f,-0.5f,0.5f,0.5f);

    glBegin(GL_POLYGON);
    for(i=0; i<n; ++i)
    {
        glVertex2f(R*cos(2*Pi/n*i),R*sin(2*Pi/n*i));
    }
    glEnd();
    glFlush();

    //直线（线段）
    glEnable(GL_LINE_STIPPLE);
    glLineStipple(2,0X0F0F);
    glLineWidth(10);
    glBegin(GL_LINES);
    glVertex2f(0.0,0.0);
    glVertex2f(0.5,0.0);
    glEnd();
    glFlush();


    //正弦函数
    GLfloat x;
    glBegin(GL_LINES);
    glVertex2f(-1.0f,0.0f);
    glVertex2f(1.0f,0.0f);
    glVertex2f(0.0f,-1.0f);
    glVertex2f(0.0f,1.0f);
    glEnd();

    glBegin(GL_LINE_STRIP);

    for(x=-1.0f/factor; x<1.0f/factor; x+=0.01f)
    {
        glVertex2f(x*factor,sin(x)*factor);
    };
    glEnd();
    glFlush();

    glPolygonMode(GL_FRONT,GL_FILL);
    glPolygonMode(GL_BACK,GL_LINE);

    glFrontFace(GL_CCW);
    glBegin(GL_POLYGON);

    glVertex2f(-0.5f,-0.5f);
    glVertex2f(0.0f,-0.5f);
    glVertex2f(0.0,0.0);
    glVertex2f(-0.5,0.0);
    glEnd();

    glBegin(GL_POLYGON);

    glVertex2f(0.0f,0.0f);
    glVertex2f(0.0f,0.5f);
    glVertex2f(0.5,0.5);
    glVertex2f(0.5,0.0);
    glEnd();

    glFlush();

    glBegin(GL_TRIANGLE_FAN);
    glColor3f(1.0,1.0,1.0);
    glVertex2f(0.0,0.0);
    for(i=0;i<=8;i++)
    {
        glColor3f(i&0x04,i&0x02,i&0x01);
        glVertex2f(cos(i*Pi/4),sin(i*Pi/4));
    }
    glEnd();
    glFlush();


}

int _tmain(int argc, _TCHAR* argv[])
{
    glutInit(&argc,(char**)argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);
    glutInitWindowPosition(100,100);
    glutInitWindowSize(400,400);
    glutCreateWindow("OpenGL Program");
    glutDisplayFunc(&myDisplay);
    glutMainLoop();
    return 0;
}