snow.txt

简单的雪花生成

#include<windows.h 
#include<GL/glut.h 
void myinit() 
{ glClearColor(0.1,0.0,0.5,0.2); 
glMatrixMode(GL_PROJECTION); 
glLoadIdentity(); 
gluOrtho2D(0.0,500.0,0.0,500.0); 
glMatrixMode(GL_MODELVIEW); 
/*visit CGPAD.COM for more information */ 
}void drawline(double x1,double y1,double ?x2,double ?y2,int k) 
{ /*visit CGPAD.COM for more information */ 
double ?one_third_x=(2.0*x1+x2)/3.0; //点（x1,y1）与点（x2,y2）连线的1/3处x轴的坐标 
double ?one_third_y=(2.0*y1+y2)/3.0; //点（x1,y1）与点（x2,y2）连线的1/3处y轴的坐标 
double ?two_third_x=(2.0*x2+x1)/3.0; //点（x1,y1）与点（x2,y2）连线的2/3处x轴的坐标 
double ?two_third_y=(2.0*y2+y1)/3.0; //点（x1,y1）与点（x2,y2）连线的2/3处y轴的坐标 
double ?m_point_x = 0.2887*(double)(y1-y2)+(x1+x2)/2.0; //突凸出的顶点的x轴的坐标 
double ?m_point_y = 0.2887*(double)(x2-x1)+(y1+y2)/2.0; //突凸出的顶点的y轴的坐标 
if(k==0) 
{ //递归终止 
glColor3f(1.0,m_point_x/400.0,m_point_y/400.0); ?//颜色随位置变化 
/*visit CGPAD.COM for more information */ 
glBegin(GL_LINE_STRIP); 
glVertex2d(x1,y1); 
glVertex2d(one_third_x,one_third_y); 
glVertex2d(m_point_x,m_point_y); 
glVertex2d(two_third_x,two_third_y); 
glVertex2d(x2,y2); 
glEnd(); 
/*visit CGPAD.COM for more information */ 
} else //递归调用 
{ drawline(x1,y1,one_third_x,one_third_y,k-1); 
drawline(one_third_x,one_third_y,m_point_x,m_point_y,k-1); 
drawline(m_point_x,m_point_y,two_third_x,two_third_y,k-1); 
drawline(two_third_x,two_third_y,x2,y2,k-1); 
/*visit CGPAD.COM for more information */ 
} glFlush(); 
}void ?display(void) 
{ glClear(GL_COLOR_BUFFER_BIT); 
drawline(100.0,150.0,250.0,410.0,8); //最大三角形得第一条边构造 
drawline(250.0,410.0,400.0,150.0,8); //第二条边 
drawline(400.0,150.0,100.0,150.0,8); //第三条边 
glFlush(); /*visit CGPAD.COM for more information */ 
}void main(int argc,char **argv) 
{ glutInit(&argc,argv); 
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB); 
glutInitWindowSize(500,500); 
glutInitWindowPosition(0,0); 
glutCreateWindow("snow"); 
glutDisplayFunc(display); 
myinit(); /*visit CGPAD.COM for more information */ 
glutMainLoop(); 
}