137.正六边形螺旋图案

  

   

    

     

    
    

     

      #include <graphics.h>
     
    
   

    

     

    
    

     

      #include <math.h>
     
    
   

    

     

    
    

     

      void polygonc();
     
    
   

    

     

    
    

     

      void main()
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
	int i,r,n,x=320,y=240;
     
    
   

    

     

    
    

     
	int gdriver=9,gmode=2;
     
    
   

    

     

    
    

     
	float theta,alfa;
     
    
   

    

     

    
    

     

      	n=30;
     
    
   

    

     

    
    

     

      	theta=6.0;
     
    
   

    

     

    
    

     
	initgraph(&gdriver,&gmode,"c:\\tc");
     
    
   

    

     

    
    

     
	cleardevice();
     
    
   

    

     

    
    

     
	setbkcolor(MAGENTA);
     
    
   

    

     

    
    

     
	setcolor(WHITE);
     
    
   

    

     

    
    

     

      	r=160;
     
    
   

    

     

    
    

     

      	alfa=60.0;
     
    
   

    

     

    
    

     
	for(i=0;i<n;i++)
     
    
   

    

     

    
    

     

      	{
     
    
   

    

     

    
    

     
		polygonc(x,y,r,6,alfa);
     
    
   

    

     

    
    

     

      		r=(int)(0.866*r/cos((30.0-theta)*0.0174533));
     
    
   

    

     

    
    

     

      		alfa=alfa+theta;
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     
	getch();
     
    
   

    

     

    
    

     
	closegraph();
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     

      void polygonc(x0,y0,r,n,af)
     
    
   

    

     

    
    

     

      int x0,y0,n,r;
     
    
   

    

     

    
    

     

      float af;
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
	int x,y,xs,ys,i;
     
    
   

    

     

    
    

     
	float dtheta,theta;
     
    
   

    

     

    
    

     
	if(n<3)
     
    
   

    

     

    
    

     
		return;
     
    
   

    

     

    
    

     

      	dtheta=6.28318/n;
     
    
   

    

     

    
    

     

      	theta=af*0.0174533;
     
    
   

    

     

    
    

     

      	xs=x0+r*cos(theta);
     
    
   

    

     

    
    

     

      	ys=y0+r*sin(theta);
     
    
   

    

     

    
    

     
	moveto(xs,ys);
     
    
   

    

     

    
    

     
	for(i=1;i<n;i++)
     
    
   

    

     

    
    

     

      	{
     
    
   

    

     

    
    

     

      		theta=theta+dtheta;
     
    
   

    

     

    
    

     

      		x=x0+r*cos(theta);
     
    
   

    

     

    
    

     

      		y=y0+r*sin(theta);
     
    
   

    

     

    
    

     
		lineto(x,y);
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     
	lineto(xs,ys);
     
    
   

    

     

    
    

     

      }
     
    
  
 

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原文链接：blog.csdn.net/weixin_41055260/article/details/124665329