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點鼠標左鍵向左移動，點鼠標右鍵向右移動

#include?

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

int?WINAPI?WinMain?(HINSTANCE?hInstance,?HINSTANCE?hPrevInstance,PSTR?szCmdLine,?int?iCmdShow)

{

static?TCHAR?szAppName[]?=?TEXT?("Bezier")?;

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?("Bezier?Splines"),

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)

{

static?POINT?apt[4]?;

HDC?hdc?;

int?cxClient,?cyClient?;

PAINTSTRUCT?ps?;

switch?(message)

{

case?WM_SIZE:

cxClient?=?LOWORD?(lParam)?;

cyClient?=?HIWORD?(lParam)?;

apt[0].x?=?cxClient?/?2?;

apt[0].y?=?cyClient-cyClient/4;

apt[1].x?=?cxClient?/?2+cxClient/7?;

apt[1].y?=?cyClient;

return?0?;

case?WM_LBUTTONDOWN:

case?WM_RBUTTONDOWN:

case?WM_MOUSEMOVE:

if(wParam?&?MK_LBUTTON?||?wParam?&?MK_RBUTTON)

{

hdc?=?GetDC?(hwnd)?;

SelectObject?(hdc,?GetStockObject?(WHITE_PEN))?;

Ellipse(hdc,apt[0].x,apt[0].y,apt[1].x,apt[1].y);

if(wParam?&?MK_LBUTTON)

{

apt[0].x-=10;

apt[1].x-=10;

}

if?(wParam?&?MK_RBUTTON)

{

apt[0].x+=10;

apt[1].x+=10;

}

SelectObject?(hdc,?GetStockObject?(BLACK_PEN))?;

Ellipse(hdc,apt[0].x,apt[0].y,apt[1].x,apt[1].y);

ReleaseDC?(hwnd,?hdc)?;

}

return?0;

case?WM_PAINT:

InvalidateRect?(hwnd,?NULL,?TRUE)?;

hdc?=?BeginPaint?(hwnd,?&ps)?;

Ellipse(hdc,apt[0].x,apt[0].y,apt[1].x,apt[1].y);

EndPaint?(hwnd,?&ps)?;

return?0?;

case?WM_DESTROY:

PostQuitMessage?(0)?;

return?0?;

}

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

}

總結

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