Code:
#include <windows.h>
HDC hdc;
const char g_szClassName[] = "myWindowClass";
HPEN hPen,hPenOld;
// Step 4: the Window Procedure
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
static int linie=0;
//static i=0;
PAINTSTRUCT ps;
static POINTS ptsIN,ptsOUT,ptsANT;
static COLORREF crRosu;
switch(msg)
{
case WM_PAINT:
hdc=BeginPaint(hwnd,&ps);
hPen=CreatePen(PS_SOLID,0,RGB(255,0,0));
hPenOld=SelectObject(hdc,hPen);
MoveToEx(hdc,20,20,NULL);
LineTo(hdc,100,100);
EndPaint(hwnd,&ps);
break;
case WM_LBUTTONDOWN:
ptsIN=MAKEPOINTS(lParam);
break;
case WM_MOUSEMOVE:
if (wParam & MK_LBUTTON )
{
ptsOUT=MAKEPOINTS(lParam);
hdc=GetDC(hwnd);
//SetROP2(hdc, R2_NOTXORPEN);
if (linie==1)
//MessageBox(hwnd,"da","daaa",MB_OK);
//ptsIN=MAKEPOINTS(lParam);
{
SetROP2(hdc, R2_NOTXORPEN);
MoveToEx(hdc,ptsIN.x,ptsIN.y,NULL);
LineTo(hdc,ptsANT.x , ptsANT.y);//sterge linia pt a face alta
}
ptsOUT=MAKEPOINTS(lParam);
//SetROP2(hdc,R2_COPYPEN);
MoveToEx(hdc,ptsIN.x,ptsIN.y,NULL);
LineTo(hdc,ptsOUT.x , ptsOUT.y);
ptsANT=ptsOUT;
ReleaseDC(hwnd,hdc);
linie=1;
}
break;
case WM_LBUTTONUP:
hdc=GetDC(hwnd);
//SetROP2(hdc,R2_NOTXORPEN);
//MoveToEx(hdc,ptsIN.x,ptsIN.y,NULL);
//LineTo(hdc,ptsOUT.x , ptsOUT.y);
//SetROP2(hdc, R2_COPYPEN);
MoveToEx(hdc,ptsIN.x,ptsIN.y,NULL);
LineTo(hdc,ptsOUT.x , ptsOUT.y);
linie=0;
ReleaseDC(hwnd,hdc);
break;
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
hdc=GetDC(hwnd);
SelectObject(hdc,hPenOld);
DeleteObject(hPen);
ReleaseDC(hwnd,hdc);
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, msg, wParam, lParam);
}
return 0;
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX wc;
HWND hwnd;
MSG Msg;
//Step 1: Registering the Window Class
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = 0;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wc.lpszMenuName = NULL;
wc.lpszClassName = g_szClassName;
wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
if(!RegisterClassEx(&wc))
{
MessageBox(NULL, "Window Registration Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}
// Step 2: Creating the Window
hwnd = CreateWindowEx(
WS_EX_CLIENTEDGE,
g_szClassName,
"The title of my window",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, 440, 320,
NULL, NULL, hInstance, NULL);
if(hwnd == NULL)
{
MessageBox(NULL, "Window Creation Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
// Step 3: The Message Loop
while(GetMessage(&Msg, NULL, 0, 0) > 0)
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
}
sorry for my english