利用OpenGL-绘制基本图元-五角星

1、精选优质文档-倾情为你奉上精选优质文档-倾情为你奉上专心-专注-专业专心-专注-专业精选优质文档-倾情为你奉上专心-专注-专业实验1：利用OpenGL 绘制基本图元实验要求和目的：掌握vc+程序开发环境，熟悉OpenGL基本程序结构。掌握基本图元的绘制方法。实验内容：点、线、三角形、多边形的绘制实验步骤：OpenGL相关库文件的安装；新建工程，OpenGL相关.lib链接，.cpp文件中包含相关.h文件输入、调试、运行OpenGL绘制基本图元的程序。设计五角星（填充）及过渡色扇面（三角，四角）的生成算法的实现程序。实验代码#include #include #include #include

2、#include void myDraw() glClear (GL_COLOR_BUFFER_BIT);glColor3f (0.0, 0.0, 1.0);glPointSize(1.0);/*假设五角星外接圆半径为1，有一个角朝上，以五角星中心为原点:则五个角顶点坐标分别为(按顺时针)：A（0,1）B(cos18,sin18)C(cos54,-sin54)D(-cos54,-sin54)E(-cos18,sin18)假设t为内部五边形外接圆半径，t=(1+tan2(18)/(3-tan2(18)，即0.01则五个顶点所对应的坐标为(即内部五边形的五个顶点)：BB(-t*cos18,-t*s

3、in18)3CC(-t*cos54,t*sin54) 2DD(t*cos54,t*sin54) 1AA(0,-t)4EE(t*cos18,-t*sin18)5*/upglBegin(GL_TRIANGLES); / 绘制三角形glVertex3f( 0.0f, 1.0f, 0.0f); / 上顶点glVertex3f(0.38f*cos(54*3.14/180.0),0.38f*sin(54*3.14/180.0), 0.0f); / 1glVertex3f(-0.38f*cos(54*3.14/180.0),0.38f*sin(54*3.14/180.0),0.0f); / 2glEnd()

4、;glColor3f (0.0, 1.0, 1.0);/left-upglBegin(GL_TRIANGLES); / 绘制三角形glVertex3f( -1.0f*cos(18*3.14/180.0), 1.0*sin(18*3.14/180.0), 0.0f); /glVertex3f(-0.38f*cos(54*3.14/180.0),0.38f*sin(54*3.14/180.0),0.0f);/2glVertex3f(-0.38f*cos(18*3.14/180.0),-0.38f*sin(18*3.14/180.0),0.0f); / 3glEnd();glColor3f (1.0

5、, 0.0, 1.0);/left-downglBegin(GL_TRIANGLES); / 绘制三角形glVertex3f( -1.0f*cos(54*3.14/180.0), -1.0*sin(54*3.14/180.0), 0.0f); /glVertex3f(-0.38f*cos(18*3.14/180.0),-0.38f*sin(18*3.14/180.0),0.0f); /3glVertex3f(0.0,-0.38f, 0.0f); / 4glEnd();glColor3f (0.0, 1.0, 0.0);/right-downglBegin(GL_TRIANGLES); / 绘制

6、三角形glVertex3f(1.0f*cos(54*3.14/180.0),-1.0f*sin(54*3.14/180.0), 0.0f);glVertex3f(0.0,-0.38f, 0.0f); / 4glVertex3f(0.38f*cos(18*3.14/180.0),-0.38f*sin(18*3.14/180.0),0.0f); / 5glEnd();glColor3f (1.0, 0.4, 0.5);/right-upglBegin(GL_TRIANGLES); / 绘制三角形glVertex3f( 1.0f*cos(18*3.14/180.0), 1.0*sin(18*3.14

7、/180.0), 0.0f); /glVertex3f(0.38f*cos(18*3.14/180.0),-0.38f*sin(18*3.14/180.0),0.0f); / 5glVertex3f(0.38f*cos(54*3.14/180.0),0.38f*sin(54*3.14/180.0), 0.0f); / 1glEnd();glColor3f (0.5, 1.0, 1.0);glBegin(GL_POLYGON); glVertex3f(0.38f*cos(54*3.14/180.0),0.38f*sin(54*3.14/180.0), 0.0f); / 1glVertex3f(-

8、0.38f*cos(54*3.14/180.0),0.38f*sin(54*3.14/180.0),0.0f); / 2glVertex3f(-0.38f*cos(18*3.14/180.0),-0.38f*sin(18*3.14/180.0),0.0f); /3glVertex3f(0.0,-0.38f, 0.0f); / 4glVertex3f(0.38f*cos(18*3.14/180.0),-0.38f*sin(18*3.14/180.0),0.0f); / 5glEnd();glFlush(); int main(int argc, char* argv) glutInit(&argc, argv);glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB); glutInitWindowS