要使用GLUT库,要将glut32.lib放到VC98\Lib下,将glut.h放到VC98\Include\GL下,并在程序中包含进glut.h。
#include <GL\glut.h>
#include <stdlib.h>
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GLfloat point1[] =
{0.25,0.25,0.0};
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GLfloat point2[] =
{0.75,0.25,0.0};
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GLfloat point3[] =
{0.75,0.75,0.0};
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GLfloat point4[] =
{0.25,0.75,0.0};
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GLfloat point5[] =
{0.3,0.45,0.0};
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GLfloat point6[] =
{0.5f,0.5f,0.0f};
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void init(void)
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{//初始化OpenGL参数
glClearColor(0.0,0.0,0.0,0.0);//设置清空颜色
glShadeModel(GL_FLAT);//设置阴影模式
glLineWidth(2.0);
glLineStipple(1,0xCCFC);
glEnable(GL_LINE_STIPPLE);
}
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void DrawPoint(void)
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{//画点
glColor3f(0.0f,0.0f,1.0f);
glPointSize(10.0);
glBegin(GL_POINTS);
glVertex3fv(point6);
glEnd();
}
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void DrawPolyGon(void)
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{//画正方形
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glColor3f(0.3f,0.2f,0.0f);//设置绘制颜色
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glBegin(GL_POLYGON);//绘制正方形
glVertex3fv(point1);
glVertex3fv(point2);
glVertex3fv(point3);
glVertex3fv(point4);
glEnd();
}
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void DrawLines(void)
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{//画直线
glColor3f(0.0f,1.0f,0.0f);
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glBegin(GL_LINES);
glVertex3fv(point1);
glVertex3fv(point3);
glVertex3fv(point2);
glVertex3fv(point4);
glEnd();
}
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void DrawTriangle(void)
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{//画三角形
glColor3f(0.0f,1.0f,0.0f);
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glBegin(GL_TRIANGLES);
glVertex3fv(point1);
glVertex3fv(point5);
glVertex3fv(point6);
glEnd();
}
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void DrawLinesStrip(void)
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{
glColor3f(1.0f,1.0f,1.0f);
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glBegin(GL_LINE_STRIP);
glVertex3fv(point1);
glVertex3fv(point3);
glVertex3fv(point5);
glVertex3fv(point2);
glVertex3fv(point4);
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glEnd();
}
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void DrawLineLoop(void)
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{
glColor3f(1.0f,1.0f,1.0f);
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glBegin(GL_LINE_LOOP);
glVertex3fv(point1);
glVertex3fv(point3);
glVertex3fv(point5);
glVertex3fv(point2);
glVertex3fv(point4);
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glEnd();
}
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void display(void)
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{//绘制函数
glClear(GL_COLOR_BUFFER_BIT);//清空缓存
DrawPolyGon();
DrawPoint();
DrawTriangle();
DrawLines();
DrawLinesStrip();
DrawLineLoop();
glutSwapBuffers();//交换缓存
}
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void reshape(int w,int h)
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{//重画函数,初次绘制,移动窗口或改变窗口大小时调用
glViewport(0,0,(GLsizei)w,(GLsizei)h);//视口变换
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
// glOrtho(0.0,1.0,0.0,1.0,-1.0,1.0);//投影变换
gluOrtho2D(0.0f,1.0f,0.0f,1.0f);
glMatrixMode(GL_MODELVIEW);//开始模型视图变换
glLoadIdentity();
}
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int main(int argc,char**argv)
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{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);//设置显示模式为"双缓冲,RGB"
glutInitWindowPosition(100,100);//窗口左上角在(100,100);
glutInitWindowSize(500,400);//窗口大小为宽500,高400
glutCreateWindow("Hello OpenGL");//创建窗口,标题为"Hello OpenGL"
init();//初始化OpenGL参数
glutDisplayFunc(display);//注册显示回调函数
glutReshapeFunc(reshape);//注册重画函数
glutMainLoop();
return 0;
}
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