[OpenGL]计算机图形学实验01：一个简单的球体

最新推荐文章于 2024-12-11 00:25:44 发布

iteye_19603

最新推荐文章于 2024-12-11 00:25:44 发布

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本文介绍了一个使用OpenGL绘制球体的示例程序。该程序通过三角扇形和四边带状来构建球面，并通过旋转变换调整视角。文章展示了如何设置绘图颜色、观察窗口以及如何在屏幕上创建并显示球体。

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#include <Windows.h>
#include <gl\glut.h>
#include<math.h>

#define PI 3.14

void myDisplay2(){

	//画两个顶端的圆形区域
	glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
	glBegin(GL_TRIANGLE_FAN);
	glVertex3d(0.0,0.0,1.0);
	double c = PI/180;
	float z = sin(c*80);
	float x,y;
	for(float theta =-180.0;theta<=180.0;theta+=20.0){
		GLfloat thetar = theta*c;
		x= sin(thetar)*cos(c*80);
		y= cos(thetar)*cos(c*80);
		glVertex3d(x,y,z);
	}
	glEnd();
	//画两个顶端的圆形区域
	glBegin(GL_TRIANGLE_FAN);
	glVertex3d(0.0,0.0,-1.0);
	z = -sin(c*80);
	for(GLfloat theta =-180.0;theta<=180.0;theta+=20.0){
		GLfloat thetar = theta*c;
		x= sin(thetar)*cos(c*80);
		y= cos(thetar)*cos(c*80);
		glVertex3d(x,y,z);


	}
	glEnd();



	for(float phi=-80;phi<=80;phi+=20){
		float phir = c*phi ;
		float phir20 = c*(phi+20) ;
		glBegin(GL_QUAD_STRIP);
		for(GLfloat theta =-180.0;theta<=180.0;theta+=20.0){
			GLfloat thetar = theta*c;

			x= sin(thetar)*cos(phir);
			y= cos(thetar)*cos(phir);
			z=sin(phir);
			glVertex3d(x,y,z);
			x= sin(thetar)*cos(phir20);
			y= cos(thetar)*cos(phir20);
			z=sin(phir20);
			glVertex3d(x,y,z);
		}
		glEnd();

	}


	glFlush();

}

void myInit2(){

	//属性设置
	glClearColor(0.0,0.0,1.0,1.0);//白色背景
	glColor3f(0.0,0.0,1.0);//绘图颜色为蓝色

	//设置观察条件
	//在观察坐标中定义一个50.0*50.0的窗口，窗口左下角为观察坐标系的坐标原点。
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluOrtho2D(-5.0,5.0,5.0,-5.0);//左右下上，因为坐标轴原点在左下角

	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	//glTranslated(2,2,0);
	glRotated(30,1,0,0);
	glRotated(60,0,1,0);
	glRotated(80,0,0,1);
	//glRotated(20,1,0,0);
	//glutPostRedisplay();


}

void main(int argc,char** argv){
	glutInit(&argc,argv);
	glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);

	glutInitWindowSize(500,500);
	glutInitWindowPosition(0,0);

	glutCreateWindow("DrawBall");


	glutDisplayFunc(myDisplay2);
	myInit2();
	glutMainLoop();


}