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| 发表于：2008-07-22 13:47:362楼 得分:0 |
我一直被这个问题困扰着,而且我发现,只要逻辑坐标系不是x由左向右,y由右向左都不能用LOEGLISH这个函数绘制矩形.下面是我的程序,请高手指正.
哦,这个写错了,应该是这样的:
#include <windows.h>
HINSTANCE hInstance1;
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
hInstance1=hInstance;
static TCHAR szAppName[] = TEXT ("LineDemo") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;
wndclass.style = CS_HREDRAW ¦ CS_VREDRAW ;
wndclass.lpfnWndProc= WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("Program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow ( szAppName, TEXT ("Line Demonstration"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc ;
PAINTSTRUCT ps ;
TCHAR szbuffer[90];
RECT rect;
HBRUSH brush;
switch (message)
{
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;
SetMapMode(hdc,MM_ISOTROPIC);
SetWindowExtEx (hdc, 1,1, NULL) ;
SetViewportExtEx (hdc, 1, -1, NULL) ;
SetViewportOrgEx(hdc,0,500,NULL);
SetRect(&rect,100,100,200,200); //这个坐标是无论怎么换,都没有矩形.
brush=CreateHatchBrush (HS_VERTICAL, 0);
SetBrushOrgEx(hdc,0,0,NULL);
FrameRect(hdc,&rect,brush);
//Rectangle(hdc,100,100,200,200);//同样的坐标,为什么这一句可以画出矩形,上一句却不行呢?FrameRect有什么特别之处导致这种现象?
EndPaint (hwnd, &ps) ;
return 0 ;
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
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