多角形モード

多角形の塗りつぶし

#include <windows.h>

LRESULT CALLBACK WndProc(HWND hwnd , UINT msg , WPARAM wp , LPARAM lp) {
	HDC hdc;
	PAINTSTRUCT ps;

	static POINT po[8];
	static INT imode;

	switch (msg) {
	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;
	case WM_CREATE:
		po[0].x = 10;	po[0].y = 50;
		po[1].x = 150;	po[1].y = 50;
		po[2].x = 150;	po[2].y = 150;
		po[3].x = 50;	po[3].y = 150;
		po[4].x = 50;	po[4].y = 10;
		po[5].x = 200;	po[5].y = 10;
		po[6].x = 200;	po[6].y = 125;
		po[7].x = 10;	po[7].y = 125;

		imode = MessageBox(
			NULL , TEXT("多角形モードを変更しますか?") ,
			TEXT("SetPolyFillMode") , MB_YESNO
		);
		if (imode == IDYES) imode = WINDING;
		else imode = ALTERNATE;

		return 0;
	case WM_PAINT:
		hdc = BeginPaint(hwnd , &ps);
		SelectObject(hdc , CreateSolidBrush(0xFF));
		SetPolyFillMode(hdc , imode);
		Polygon(hdc , po , 8);
		EndPaint(hwnd , &ps);
		DeleteObject(SelectObject(hdc , GetStockObject(WHITE_BRUSH)));
		return 0;
	}
	return DefWindowProc(hwnd , msg , wp , lp);
}

int WINAPI WinMain(HINSTANCE hInstance , HINSTANCE hPrevInstance ,
			PSTR lpCmdLine , int nCmdShow ) {
	HWND hwnd;
	MSG msg;
	WNDCLASS winc;

	winc.style		= CS_HREDRAW | CS_VREDRAW;
	winc.lpfnWndProc	= WndProc;
	winc.cbClsExtra	= winc.cbWndExtra	= 0;
	winc.hInstance		= hInstance;
	winc.hIcon		= LoadIcon(NULL , IDI_APPLICATION);
	winc.hCursor		= LoadCursor(NULL , IDC_ARROW);
	winc.hbrBackground	= (HBRUSH)GetStockObject(WHITE_BRUSH);
	winc.lpszMenuName	= NULL;
	winc.lpszClassName	= TEXT("KITTY");

	if (!RegisterClass(&winc)) return -1;

	hwnd = CreateWindow(
			TEXT("KITTY") , TEXT("Kitty on your lap") ,
			WS_OVERLAPPEDWINDOW | WS_VISIBLE ,
			CW_USEDEFAULT , CW_USEDEFAULT ,
			CW_USEDEFAULT , CW_USEDEFAULT ,
			NULL , NULL , hInstance , NULL
	);

	if (hwnd == NULL) return -1;

	while(GetMessage(&msg , NULL , 0 , 0)) DispatchMessage(&msg);
	return msg.wParam;
}

WINDING	ALTERNATE

Polygon()

PolyPolygon()

BOOL PolyPolygon(
	HDC hdc,
	CONST POINT *lpPoints,
	CONST INT *lpPolyCounts,
	int nCount
);

SetPolyFillMode()