WIN32问题

_程序员 2011-11-14 11:43:03

做一个程序,模拟photoshop的钢笔工具,现在效果做出来了,可以绘制出任意的曲线,

但是现在的问题是,窗体会闪烁,因为要把最后一点和光标连接起来,所以光标移动的时候(也是是在WM_MOUSEMOVE消息中)要重绘窗体,

试过用双缓冲,但是光标移动的时候,要重绘窗体,所以也要载入一次DC所以双缓冲也会闪,

求高人给一个可以解决问题的方法

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ryfdizuo 2011-11-14

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我原来用opengl+glut模拟过ps的钢笔工具，就是多段bezier拼接。
win32下双缓存是不会闪的，
这里有个双缓存的例子，你参考一下：http://www.relisoft.com/win32/bitmap.html

_程序员 2011-11-14

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把这个程序弄到不闪(不改变现有功能)就OK了

_程序员 2011-11-14

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贴点代码出来吧,这个是测试用的,不过我的目的就是达到这个效果

#include <windows.h>



LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

HINSTANCE _hInstance;



int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,

					PSTR szCmdLine, int iCmdShow)

{

	static TCHAR szAppName[] = TEXT ("Connect") ;

	HWND hwnd ;

	MSG msg ;

	_hInstance=hInstance;



	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) ;//NULL;//

	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 ("Connect-the-Points Mouse Demo"),

		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 ;

}

HDC hdc,bgHdc,tHdc;

HBITMAP bgHmap;



LRESULT CALLBACK WndProc ( HWND hwnd, UINT message, WPARAM wParam,LPARAM

						  lParam)

{	static PAINTSTRUCT ps;

	switch (message)

	{

	case WM_CREATE:

           SetTimer (hwnd, 1, 20, NULL) ;

		return 0;

	case WM_LBUTTONDOWN:



		return 0 ;

	case WM_MOUSEMOVE:

		InvalidateRgn(hwnd,0,TRUE);

		hdc = BeginPaint(hwnd,&ps);

		LineTo(hdc,LOWORD (lParam),HIWORD (lParam));

		EndPaint(hwnd,&ps);

		InvalidateRgn(hwnd,0,FALSE);

		DeleteDC(hdc);

		return 0 ;

	case WM_LBUTTONUP:



		return 0 ;

	case WM_PAINT:

		BeginPaint(hwnd,&ps);

		EndPaint (hwnd, &ps);

		return 0 ;

	case WM_TIMER:

	hdc = GetDC(hwnd);

		bgHdc = CreateCompatibleDC(NULL);//GetDC(hwnd); //

		bgHmap = (HBITMAP)LoadImage(_hInstance,"C:\\test.bmp",IMAGE_BITMAP,0,0,LR_DEFAULTCOLOR|LR_LOADFROMFILE);

		SelectObject(bgHdc,bgHmap);

		//bgHmap   =   CreateCompatibleBitmap(bgHdc,   

         //                                 GetDeviceCaps(hdc,   HORZRES),   

          //                                GetDeviceCaps(hdc,   VERTRES));   

  

		//SelectObject(bgHdc,   bgHmap); 

		BeginPaint(hwnd,&ps);

		LineTo(bgHdc,300,100);

		LineTo(bgHdc,100,100);

		LineTo(bgHdc,200,100);

		LineTo(bgHdc,400,100);

		LineTo(bgHdc,500,100);

		LineTo(bgHdc,100,200);

		LineTo(bgHdc,300,100);

		LineTo(bgHdc,100,500);

		EndPaint (hwnd, &ps) ;

		BitBlt(hdc,0,0,600,400,bgHdc,0,0,SRCCOPY);

		DeleteDC(hdc);

		DeleteDC(bgHdc);

		DeleteObject(bgHmap);

		return 0;

	case WM_DESTROY:

		PostQuitMessage (0) ;

		return 0 ;

	}

	return DefWindowProc (hwnd, message, wParam, lParam) ;

}