138.正方形螺旋拼块图案

  

   

    

     

    
    

     

      #include <graphics.h>
     
    
   

    

     

    
    

     

      #include <math.h>
     
    
   

    

     

    
    

     

      void polygonc();
     
    
   

    

     

    
    

     

      void block();
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      void main()
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
	int i,j,a,length,n,theta,x=100,y=350;
     
    
   

    

     

    
    

     
	int gdriver=DETECT,gmode;
     
    
   

    

     

    
    

     
	printf("input length, n theta:");
     
    
   

    

     

    
    

     
	scanf("%d%d%d",&length,&n,&theta);
     
    
   

    

     

    
    

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

    

     

    
    

     
	cleardevice();
     
    
   

    

     

    
    

     
	setbkcolor(9);
     
    
   

    

     

    
    

     
	setcolor(4);
     
    
   

    

     

    
    

     

      	a=length/4;
     
    
   

    

     

    
    

     
	for(i=1;i<=4;i++)
     
    
   

    

     

    
    

     

      	{
     
    
   

    

     

    
    

     
		for(j=1;j<=4;j++)
     
    
   

    

     

    
    

     

      		{
     
    
   

    

     

    
    

     
			block(x,y,a,n,theta);
     
    
   

    

     

    
    

     

      			theta=-theta;
     
    
   

    

     

    
    

     

      			x=x+a;
     
    
   

    

     

    
    

     

      		}
     
    
   

    

     

    
    

     

      		x=100;
     
    
   

    

     

    
    

     

      		y=y-a;
     
    
   

    

     

    
    

     

      		theta=-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);
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     

      void block(x,y,a,n,theta)
     
    
   

    

     

    
    

     

      int x,y,a,n,theta;
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
	int x0,y0,i,r;
     
    
   

    

     

    
    

     
	float t,f,af=45.;
     
    
   

    

     

    
    

     

      	t=fabs(theta*0.0174533);
     
    
   

    

     

    
    

     

      	f=1.0/(cos(t)+sin(t));
     
    
   

    

     

    
    

     

      	r=a/1.414;
     
    
   

    

     

    
    

     

      	x0=x+0.5*a;
     
    
   

    

     

    
    

     

      	y0=y+0.5*a;
     
    
   

    

     

    
    

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

    

     

    
    

     

      	{
     
    
   

    

     

    
    

     
		polygonc(x0,y0,r,4,af);
     
    
   

    

     

    
    

     

      		r=r*f;
     
    
   

    

     

    
    

     

      		af=af-theta;
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     

      }
     
    
  
 

  
 
 

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原文链接：blog.csdn.net/weixin_41055260/article/details/124665396