els 显示一个随机方块

原创已于 2022-07-30 21:15:50 修改 · 82 阅读

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于 2022-07-28 00:00:00 首次发布

本文介绍了使用Windows API实现的图形编程，包括创建兼容DC、位图和内存DC，以及在OnPaint函数中绘制随机方块并将其复制到背景数组上。CreateRandomSqare函数生成不同形状的方块，CopySqareToBack函数用于将这些方块融合到背景中。

1、函数实现（els.c）

#include"els_h.h"
//背景数组
char g_arrBackGroud[20][10] = {0};
char g_arrSqare[2][4] = {0};

void OnPaint(HDC hDc)
{
//创建兼容性DC。
HDC hMemDC = CreateCompatibleDC(hDc);//内存id为：HMemDc,窗口id hDc。

//创建兼容性位图。
HBITMAP hBitmapBack= CreateCompatibleBitmap(hDc, 500, 600);

//关联起来。
SelectObject(hMemDC, hBitmapBack);

   PaintSqare(hMemDC);

   //传递：
   //返回值：失败返回0，成功返回非零。
   //参数1：目标DC，窗口DC
   //参数2，3：目标的起始位置，注意是基于我们的窗口。
   //参数4，5：区域的大小。
   //参数6：源DC，也就是我们的内存DC。
   //参数7，8：内存图片的起始位置。
   //参数9：传递方式。
   //
   BitBlt(hDc, 0, 0, 300, 600, hMemDC, 0, 0, SRCCOPY);

   //释放DC
   DeleteObject(hBitmapBack);
   DeleteDC(hMemDC);


}
void Oncreate()
{
   srand((unsigned int)time(NULL));//只执行一次。
   CreateRandomSqare();
   CopySqareToBack();
}
void PaintSqare(HDC hMemDC)
{
   int i = 0,
       j = 0;

   //画大方块。
   Rectangle(hMemDC, 0, 0, 300, 600);//矩形框距离运行窗口的开始位置坐标和截至位置坐标。

   //指定一个方块。
   /*g_arrBackGroud[2][4] = 1;
   g_arrBackGroud[3][3] = 1;
   g_arrBackGroud[3][4] = 1;
   g_arrBackGroud[3][5] = 1;*/

   //遍历
   for (i=0 ; i < 20; i++)
   {
       for (j=0 ; j < 10; j++)
       {
           if (1 == g_arrBackGroud[i][j])
           {
               //画方块。
               Rectangle(hMemDC, j*30, i*30, j*30 + 30, i*30 + 30);//矩形框距离运行窗口的开始位置坐标和截至位置坐标。

           }
       }
   }

}
//创建随机块。
int CreateRandomSqare()
{
   int nIndex=rand()%7;
   switch (nIndex)
   {
    case 0:
       g_arrSqare[0][0] = 1, g_arrSqare[0][1] = 1, g_arrSqare[0][2] = 0, g_arrSqare[0][3] = 0;
       g_arrSqare[1][0] = 0, g_arrSqare[1][1] = 1, g_arrSqare[1][2] = 1, g_arrSqare[1][3] = 0;

       break;
   case 1:
       g_arrSqare[0][0] = 0, g_arrSqare[0][1] = 1, g_arrSqare[0][2] = 1, g_arrSqare[0][3] = 0;
       g_arrSqare[1][0] = 1, g_arrSqare[1][1] = 1, g_arrSqare[1][2] = 0, g_arrSqare[1][3] = 0;

       break;
   case 2:
       g_arrSqare[0][0] = 0, g_arrSqare[0][1] = 1, g_arrSqare[0][2] = 0, g_arrSqare[0][3] = 0;
       g_arrSqare[1][0] = 1, g_arrSqare[1][1] = 1, g_arrSqare[1][2] = 1, g_arrSqare[1][3] = 0;

       break;
   case 3:
       g_arrSqare[0][0] = 1, g_arrSqare[0][1] = 0, g_arrSqare[0][2] = 0, g_arrSqare[0][3] = 0;
       g_arrSqare[1][0] = 1, g_arrSqare[1][1] = 1, g_arrSqare[1][2] = 1, g_arrSqare[1][3] = 0;
       g_nList = 3;
       break;
   case 4:
       g_arrSqare[0][0] = 0, g_arrSqare[0][1] = 0, g_arrSqare[0][2] = 1, g_arrSqare[0][3]= 0;
       g_arrSqare[1][0] = 1, g_arrSqare[1][1] = 1, g_arrSqare[1][2] = 1, g_arrSqare[1][3] = 0;

       break;
   case 5:
       g_arrSqare[0][0] = 0, g_arrSqare[0][1] = 1, g_arrSqare[0][2] = 1, g_arrSqare[0][3] = 0;
       g_arrSqare[1][0] = 0, g_arrSqare[1][1] = 1, g_arrSqare[1][2] = 1, g_arrSqare[1][3] = 0;

       break;
   case 6:
       g_arrSqare[0][0] = 1, g_arrSqare[0][1] = 1, g_arrSqare[0][2] = 1, g_arrSqare[0][3] = 1;
       g_arrSqare[1][0] = 0, g_arrSqare[1][1] = 0, g_arrSqare[1][2] = 0, g_arrSqare[1][3] = 0;

       break;

   }
   return nIndex;
}
void CopySqareToBack()
{
   int i = 0,
       j = 0;
   for (i = 0; i < 2; i++)
   {
       for (j = 0; j < 4; j++)
       {
           g_arrBackGroud[i][j + 3] = g_arrSqare[i][j];
       }
   }

}

2、头函数（els.h）

#ifndef N_d
#define N_d

#include<Windows.h>
#include<time.h>
void OnPaint(HDC hDc);
//显示方块。
void PaintSqare(HDC hMemDC);
//产生随机块。
int CreateRandomSqare();
//随机块贴近背景。
void CopySqareToBack();
void Oncreate();

#endif