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BEZIER.C
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C/C++ Source or Header
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1992-09-01
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4KB
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130 lines
/*---------------------------------------
BEIZER.C -- Win32 Bezier Splines Demo
(c) Charles Petzold, 1992
---------------------------------------*/
#include <windows.h>
LONG APIENTRY WndProc (HWND, UINT, DWORD, LONG) ;
int PASCAL WinMain (HANDLE hInstance, HANDLE hPrevInstance,
LPSTR lpszCmdParam, int nCmdShow)
{
static char szAppName[] = "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 = GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
RegisterClass (&wndclass) ;
hwnd = CreateWindow (szAppName, "Bezier Splines",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;
ShowWindow (hwnd, nCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}
void DrawBezier (HDC hdc, POINT apt [])
{
PolyBezier (hdc, apt, 4) ;
MoveToEx (hdc, apt[0].x, apt[0].y, NULL) ;
LineTo (hdc, apt[1].x, apt[1].y) ;
MoveToEx (hdc, apt[2].x, apt[2].y, NULL) ;
LineTo (hdc, apt[3].x, apt[3].y) ;
}
LONG APIENTRY WndProc (HWND hwnd, UINT message, DWORD wParam, LONG lParam)
{
static POINT apt [4] ;
HDC hdc ;
PAINTSTRUCT ps ;
short cxClient, cyClient ;
switch (message)
{
case WM_SIZE:
cxClient = LOWORD (lParam) ;
cyClient = HIWORD (lParam) ;
apt[0].x = cxClient / 4 ;
apt[0].y = cyClient / 2 ;
apt[1].x = cxClient / 2 ;
apt[1].y = cyClient / 4 ;
apt[2].x = cxClient / 2 ;
apt[2].y = 3 * cyClient / 4 ;
apt[3].x = 3 * cxClient / 4 ;
apt[3].y = cyClient / 2 ;
return 0 ;
case WM_MOUSEMOVE:
if (wParam & MK_LBUTTON || wParam & MK_RBUTTON)
{
hdc = GetDC (hwnd) ;
SelectObject (hdc, GetStockObject (WHITE_PEN)) ;
DrawBezier (hdc, apt) ;
if (wParam & MK_LBUTTON)
{
apt[1].x = LOWORD (lParam) ;
apt[1].y = HIWORD (lParam) ;
}
if (wParam & MK_RBUTTON)
{
apt[2].x = LOWORD (lParam) ;
apt[2].y = HIWORD (lParam) ;
}
SelectObject (hdc, GetStockObject (BLACK_PEN)) ;
DrawBezier (hdc, apt) ;
ReleaseDC (hwnd, hdc) ;
}
return 0 ;
case WM_PAINT:
InvalidateRect (hwnd, NULL, TRUE) ;
hdc = BeginPaint (hwnd, &ps) ;
DrawBezier (hdc, apt) ;
EndPaint (hwnd, &ps) ;
return 0 ;
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}