屏幕保护程序（球体运动）

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简单的版权声明

作者：WinGame_D

时间：2010-2-24

用时：6小时

效果：一个色彩渐变的球体在窗口中运动，遇到边界发生碰撞

适用学习人群：windows程序设计初学者（高手勿笑话我的粗浅的设计）

以下代码只用于学习，请勿转载

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//windowsAPI.h代码段

 

#pragma once
#include <windows.h>

//碰撞测试函数，发生碰撞将改变球体运动方向

void SetPointDirect(HWND hWnd,RECT &GRect,POINT &DirectPoint)
{
 RECT rect;
 GetClientRect(hWnd,&rect);

 RECT newRect;
 newRect.top=GRect.top+DirectPoint.y;
 newRect.bottom=GRect.bottom+DirectPoint.y;
 newRect.left=GRect.left+DirectPoint.x;
 newRect.right=GRect.right+DirectPoint.x;

 if(newRect.top<rect.top || newRect.bottom>rect.bottom)
 {
  DirectPoint.y=0-DirectPoint.y;
 }
 if(newRect.left<rect.left || newRect.right>rect.right)
 {
  DirectPoint.x=0-DirectPoint.x;
 }
 GRect.top=GRect.top+DirectPoint.y;
 GRect.bottom=GRect.bottom+DirectPoint.y;
 GRect.left=GRect.left+DirectPoint.x;
 GRect.right=GRect.right+DirectPoint.x; 
}

 

 

//windowsAPI.cpp代码段

 

#include <windows.h>
#include <crtdbg.h>
#include <tchar.h>
#include "windowsAPI.h"
LRESULT CALLBACK WinProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam)
{
      HDC                  hdc;
      static HDC        DrawHDC;     //全局的兼容DC，作用是在后台这个DC上画好，然后画好的东西让hdc显示
      static HBITMAP DrawBitmap; //全局的兼容位图
      HPEN                newpen;      
      HBRUSH            newbrush;
      static RECT       mCircle={0,0,200,200};    //圆的大小
      static POINT     Direction={5,2};                //运动方向
      static int           x=0,y=0,z=0;                     //色彩RGB分量
      static int           m=1,n=2,o=3;                   //色彩分量的改变度
 switch(message)
 {
 case WM_TIMER:
        hdc=GetDC(hWnd);
        BitBlt(DrawHDC,0,0,800,600,hdc,0,0,WHITENESS);
        newpen=CreatePen(PS_SOLID,3,RGB(x,y,z));  
        SelectObject(DrawHDC,newpen);
        newbrush=CreateSolidBrush(RGB(x,y,z));
        SelectObject(DrawHDC,newbrush);
        x=x+m;
        y=y+n;
        z=z+o;
        if(x+m>255 || x+m<0)
       {
           m=-m;
       }
       if(y+n>255 || y+n<0)
      {
           n=-n;
      }
      if(z+o>255 || z+o<0)
      {
           o=-o;
      }
      SetPointDirect(hWnd,mCircle,Direction);
      Ellipse(DrawHDC,mCircle.left,mCircle.top,mCircle.right,mCircle.bottom);

      BitBlt(hdc,0,0,800,600,DrawHDC,0,0,SRCCOPY);
      DeleteObject(newpen);
      DeleteObject(newbrush);
      ReleaseDC(hWnd,hdc);  
      break;
 case WM_CREATE:
  {
      SetTimer(hWnd,1,20,NULL);
      hdc=GetDC(hWnd);
      DrawHDC=CreateCompatibleDC(hdc);
      DrawBitmap=CreateCompatibleBitmap(hdc,800,600);
      SelectObject(DrawHDC,DrawBitmap);
      ReleaseDC(hWnd,hdc);
  }
  break;
 case WM_PAINT:
  break;
 case WM_DESTROY:
      KillTimer(hWnd,1);
      DeleteObject(DrawBitmap);
      ReleaseDC(hWnd,DrawHDC);
      PostQuitMessage(0);
   break;

}
 return DefWindowProc(hWnd,message,wParam,lParam);

}

 

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd)
{
 WNDCLASS wc={0};
 wc.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
 wc.lpfnWndProc=WinProc;
 wc.hInstance=hInstance;
 wc.lpszClassName=_T("DeskProtect");
 wc.style=CS_HREDRAW | CS_VREDRAW ;

 RegisterClass(&wc);

 HWND hWnd=CreateWindow(_T("DeskProtect"),_T("WinDeskPro"),WS_BORDER | WS_CAPTION | WS_SYSMENU ,50,50,800,600,NULL,NULL,hInstance,NULL);

 _ASSERTE(hWnd!=0);

 ShowWindow(hWnd,nShowCmd);
 UpdateWindow(hWnd);
 
 MSG msg={0};
 while(GetMessage(&msg,NULL,0,0))
 {
  TranslateMessage(&msg);
  DispatchMessage(&msg);
 }
 return 0;
}