棋盘覆盖（绘图版）

#include<graphics.h>
#include<stdlib.h>
#include<stdio.h>
#include<conio.h>
#include<time.h>
#include<cmath>

int tile=1;
int board[100][100];
int color[16] = { BLACK,GREEN,BLUE,CYAN,RED,YELLOW,WHITE,LIGHTMAGENTA,
LIGHTRED,LIGHTCYAN,LIGHTGREEN,LIGHTBLUE,DARKGRAY,LIGHTGRAY,BROWN,MAGENTA};

void chessBoard(int tr, int tc, int dr, int dc, int size)
{
       if(size==1)
              return;
       int t=tile++;
       int s=size/2;
       if(dr<tr+s && dc<tc+s)
              chessBoard(tr, tc, dr, dc, s);
       else
       {
              board[tr+s-1][tc+s-1]=t;
              chessBoard(tr, tc, tr+s-1, tc+s-1, s);
       }
       if(dr<tr+s && dc>=tc+s)
              chessBoard(tr, tc+s, dr, dc, s);
       else
       {
              board[tr+s-1][tc+s]=t;
              chessBoard(tr, tc+s, tr+s-1, tc+s, s);
       }
       if(dr>=tr+s && dc<tc+s)
              chessBoard(tr+s, tc, dr, dc, s);
       else
       {
              board[tr+s][tc+s-1]=t;
              chessBoard(tr+s, tc, tr+s, tc+s-1, s);
       }
       if(dr>=tr+s && dc>=tc+s)
              chessBoard(tr+s, tc+s, dr, dc, s);
       else
       {
              board[tr+s][tc+s]=t;
              chessBoard(tr+s, tc+s, tr+s, tc+s, s);
       }
}

void main()
{
       int i,j;
       int size;
       int index_x,index_y;
       printf("请输入棋盘边长(必须是2的K次幂)
");
       scanf("%d",&size);
       printf("请输入棋盘中要覆盖点的坐标:
");
       scanf("%d%d",&index_x,&index_y);
       initgraph(640,640);
       chessBoard(0,0,index_x,index_y,size);
       BeginBatchDraw();
       int S=size*size;
   for(int k=0;k<S;k++)
   {
    i=k/size;
    j=k%size;
   setfillcolor(color[board[i][j]%15]);
   solidrectangle(40*j,(40+40*i),(40+40*j),40*i);
   }
FlushBatchDraw();
EndBatchDraw();
getch();
closegraph();
}