更新时间:2016-01-13 20:17:15浏览次数:1+次
在Windows编程中,通常涉及到三个坐标系,分别为屏幕坐标系、窗口坐标系和客户区坐标系。下面来看一张三种坐标系的说明图:
下面是程序执行的效果截图:
#include "windows.h"
#include <tchar.h>
TCHAR tip[100]=_T("");
TCHAR txt[100]=_T("C++技术网www.cjjjs.com");
// - 项目是Unicode字符集
LRESULT CALLBACK WinProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
static POINT ptScreen,ptClient,ptOrg;//静态变量,默认初始化为0
switch (message)
{
case WM_PAINT:
hdc = BeginPaint(hwnd,&ps);
TextOut(hdc,2,10,txt,lstrlen(txt));
wsprintf(txt,_T("客户区:(%d , %d),客户区原点屏幕坐标:(%d , %d),屏幕:(%d , %d)"),ptClient.x,ptClient.y,ptOrg.x,ptOrg.y,ptScreen.x,ptScreen.y);
TextOut(hdc,2,30,tip,lstrlen(tip));
EndPaint(hwnd,&ps);
return 0;
case WM_MOUSEMOVE:
{
//客户区鼠标移动时lParam携带的是客户区坐标
ptClient.x = LOWORD(lParam);
ptClient.y = HIWORD(lParam);
ptScreen.x=ptClient.x;
ptScreen.y=ptClient.y;
ClientToScreen(hwnd,&ptScreen);//将客户区坐标转换为屏幕坐标
ptOrg.x=ptOrg.y=0;
ClientToScreen(hwnd,&ptOrg);//将窗口的
InvalidateRect(hwnd,NULL,TRUE);
ScreenToClient()
}
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
default:
break;//跳出到默认处理
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrev,LPSTR lpCmd,int iShow)
{
TCHAR ClassName[] = _T("MyClass");
TCHAR title1[] = _T("C++技术网http://www.cjjjs.com");
WNDCLASS wndClass;
wndClass.cbClsExtra=0;
wndClass.cbWndExtra=0;
wndClass.hbrBackground= (HBRUSH)GetStockObject(WHITE_BRUSH);
wndClass.hCursor=LoadCursor(NULL,IDC_ARROW);
wndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wndClass.hInstance = hInstance;
wndClass.lpfnWndProc = WinProc;
wndClass.lpszClassName = ClassName;
wndClass.lpszMenuName=NULL;
wndClass.style=CS_HREDRAW|CS_VREDRAW|CS_DBLCLKS;
if(!RegisterClass(&wndClass))return 0;
HWND hwnd = CreateWindow(ClassName,title1,WS_OVERLAPPEDWINDOW,0,0,350,400,NULL,NULL,hInstance,NULL);
ShowWindow(hwnd,SW_SHOWNORMAL);
MSG msg;
while (GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
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