regions.cpp

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// Regions.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "resource.h"
#include	<math.h>

#define MAX_LOADSTRING 100
#define	PI		3.14159
#define	TEXT_FORMAT		(DT_SINGLELINE|DT_VCENTER|DT_CENTER)

// Global Variables:
HINSTANCE hInst;								// current instance
TCHAR szTitle[MAX_LOADSTRING];								// The title bar text
TCHAR szWindowClass[MAX_LOADSTRING];								// The title bar text

// Foward declarations of functions included in this code module:
ATOM				MyRegisterClass(HINSTANCE hInstance);
BOOL				InitInstance(HINSTANCE, int);
LRESULT CALLBACK	WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK	About(HWND, UINT, WPARAM, LPARAM);

void DoRectRegion (HWND hWnd, HDC hdc, bool bInvert = false);
void DoRoundRectRegion (HWND hWnd, HDC hdc, bool bInvert = false);
void DoCircleRegion (HWND hWnd, HDC hdc, bool bInvert = false);
void DoEllipseRegion (HWND hWnd, HDC hdc, bool bInvert = false);
void DoPolyRegion (HWND hWnd, HDC hdc, bool bStar = false, bool bInvert = false);
void DoCloverRegion (HWND hWnd, HDC hdc, bool bInvert = false);
void DrawRadials (HDC hdc, HRGN hRgn, RECT & rc, int nShadow = 4, int nStep = 1);
void DoMappingModes (HWND hWnd, HDC hdc);
void DrawRect (HDC hdc, int x, int y, int width, int depth);
void DoRectanglePath (HWND hWnd, HDC hdc);
void DoTextPath (HWND hWnd, HDC hdc);
void CreateLogFont (HDC hdc, LOGFONT & lf, int nPoints = 10, char *szFace = "Times New Roman Bold");
void DoMouseEvent (HWND hWnd, UINT message, UINT nFlags, POINT & point);
void DoMouseLine (HDC hdc, POINT & ptLineStart, POINT & ptLineEnd);

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
 	// TODO: Place code here.
	MSG msg;
	HACCEL hAccelTable;

	// Initialize global strings
	LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
	LoadString(hInstance, IDC_REGIONS, szWindowClass, MAX_LOADSTRING);
	MyRegisterClass(hInstance);

	// Perform application initialization:
	if (!InitInstance (hInstance, nCmdShow)) 
	{
		return FALSE;
	}

	hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_REGIONS);

	// Main message loop:
	while (GetMessage(&msg, NULL, 0, 0)) 
	{
		if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) 
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}

	return msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
//  COMMENTS:
//
//    This function and its usage is only necessary if you want this code
//    to be compatible with Win32 systems prior to the 'RegisterClassEx'
//    function that was added to Windows 95. It is important to call this function
//    so that the application will get 'well formed' small icons associated
//    with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
	WNDCLASSEX wcex;

	wcex.cbSize = sizeof(WNDCLASSEX); 

	wcex.style			= CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc	= (WNDPROC)WndProc;
	wcex.cbClsExtra		= 0;
	wcex.cbWndExtra		= 0;
	wcex.hInstance		= hInstance;
	wcex.hIcon			= LoadIcon(hInstance, (LPCTSTR)IDI_REGIONS);
	wcex.hCursor		= LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground	= (HBRUSH)(COLOR_WINDOW+1);
	wcex.lpszMenuName	= (LPCSTR)IDC_REGIONS;
	wcex.lpszClassName	= szWindowClass;
	wcex.hIconSm		= LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);

	return RegisterClassEx(&wcex);
}

//
//   FUNCTION: InitInstance(HANDLE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;

   hInst = hInstance; // Store instance handle in our global variable

   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }

   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

   return TRUE;
}

//
//  FUNCTION: WndProc(HWND, unsigned, WORD, LONG)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_COMMAND	- process the application menu
//  WM_PAINT	- Paint the main window
//  WM_DESTROY	- post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int nMode = IDM_REGION_CLEAR;
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
static bool	bInvert = false;

	switch (message) 
	{
		case WM_COMMAND:
			wmId    = LOWORD(wParam); 
			wmEvent = HIWORD(wParam);
			
			// Parse the menu selections:
			switch (wmId)
			{
				case IDM_ABOUT:
				   DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
				   break;
				case IDM_EXIT:
				   DestroyWindow(hWnd);
				   break;
				case IDM_REGION_INVERT:
					bInvert = bInvert ? false : true;
					RECT rc;
					GetClientRect(hWnd, &rc);
					InvalidateRect (hWnd, &rc, TRUE);
					break;
				case IDM_REGION_ELLIPSE:
				case IDM_REGION_CLEAR:
				case IDM_REGION_RECT:
				case IDM_REGION_ROUNDRECT:
				case IDM_REGION_CIRCLE:
				case IDM_REGION_POLY:
				case IDM_REGION_STAR:
				case IDM_REGION_CLOVER:
				case IDM_MAPPING_MODES:
				case IDM_PATHS_RECTANGLE:
				case IDM_PATHS_TEXT:
					bInvert = false;
					nMode = wmId;
					GetClientRect(hWnd, &rc);
//					rc.right /= 2;
					InvalidateRect (hWnd, &rc, TRUE);
					break;
				default:
				   return DefWindowProc(hWnd, message, wParam, lParam);
			}
			break;
		case WM_LBUTTONDOWN:
		case WM_LBUTTONUP:
		case WM_MOUSEMOVE:
			POINT point;
			point.x = LOWORD(lParam);
			point.y = HIWORD(lParam);
			DoMouseEvent (hWnd, message, wParam, point);
			break;
		case WM_SIZE:
			break;
		case WM_CREATE:
			break;
		case WM_PAINT:
			hdc = BeginPaint(hWnd, &ps);
			switch (nMode)
			{
				default:
				case IDM_REGION_CLEAR:		//	Clear screen
					break;
				case IDM_REGION_RECT:
					DoRectRegion (hWnd, hdc, bInvert);
					break;
				case IDM_REGION_ROUNDRECT:
					DoRoundRectRegion (hWnd, hdc, bInvert);
					break;
				case IDM_REGION_CIRCLE:
					DoCircleRegion (hWnd, hdc, bInvert);
					break;
				case IDM_REGION_ELLIPSE:
					DoEllipseRegion (hWnd, hdc, bInvert);
					break;
				case IDM_REGION_POLY:
					DoPolyRegion (hWnd, hdc, false, bInvert);
					break;
				case IDM_REGION_STAR:
					DoPolyRegion (hWnd, hdc, true, bInvert);
					break;
				case IDM_REGION_CLOVER:
					DoCloverRegion (hWnd, hdc, bInvert);
					break;
				case IDM_MAPPING_MODES:
					DoMappingModes (hWnd, hdc);
					break;
				case IDM_PATHS_RECTANGLE:
					DoRectanglePath (hWnd, hdc);
					break;
				case IDM_PATHS_TEXT:
					DoTextPath (hWnd, hdc);
					break;
			}

			// TODO: Add any drawing code here...
			EndPaint(hWnd, &ps);
			break;
		case WM_DESTROY:
			PostQuitMessage(0);
			break;
		default:
			return DefWindowProc(hWnd, message, wParam, lParam);
   }
   return 0;
}

// Mesage handler for about box.
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch (message)
	{
		case WM_INITDIALOG:
				return TRUE;

		case WM_COMMAND:
			if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL) 
			{
				EndDialog(hDlg, LOWORD(wParam));
				return TRUE;
			}
			break;
	}
    return FALSE;
}


void DoRectRegion (HWND hWnd, HDC hdc, bool bInvert)
{
RECT	rcRegion, rcClient;
HRGN	hRgn;

	GetClientRect (hWnd, &rcClient);
	rcRegion.top = rcClient.bottom / 4;
	rcRegion.bottom = rcRegion.top * 3;
	rcRegion.left = rcClient.right / 4;
	rcRegion.right = rcRegion.left * 3;
	hRgn = CreateRectRgnIndirect (&rcRegion);

	DrawRadials (hdc, hRgn, rcClient);
	if (bInvert)
		InvertRgn (hdc, hRgn);
	DeleteObject (hRgn);
}

void DoRoundRectRegion (HWND hWnd, HDC hdc, bool bInvert)
{
RECT	rcRegion, rcClient;
HRGN	hRgn;

	GetClientRect (hWnd, &rcClient);
	rcRegion.top = rcClient.bottom / 4;
	rcRegion.bottom = rcRegion.top * 3;
	rcRegion.left = rcClient.right / 4;
	rcRegion.right = rcRegion.left * 3;
	hRgn = CreateRoundRectRgn (rcRegion.left, rcRegion.top,
							   rcRegion.right, rcRegion.bottom, 10, 10);

	DrawRadials (hdc, hRgn, rcClient);
	if (bInvert)
		InvertRgn (hdc, hRgn);
	DeleteObject (hRgn);
}

void DoCircleRegion (HWND hWnd, HDC hdc, bool bInvert)
{
RECT	rcRegion, rcClient;
HRGN	hRgn;

	GetClientRect (hWnd, &rcClient);
	int nSide = rcClient.bottom / 2;
	rcRegion.top = (rcClient.bottom - nSide) / 2 ;
	rcRegion.bottom = rcRegion.top + nSide;
	rcRegion.left = (rcClient.right - nSide) / 2;
	rcRegion.right = rcRegion.left + nSide;
	hRgn = CreateEllipticRgnIndirect (&rcRegion);

	DrawRadials (hdc, hRgn, rcClient);
	if (bInvert)
		InvertRgn (hdc, hRgn);
	DeleteObject (hRgn);
}

void DoEllipseRegion (HWND hWnd, HDC hdc, bool bInvert)
{
RECT	rcRegion, rcClient;
HRGN	hRgn;

	GetClientRect (hWnd, &rcClient);
	rcRegion.top = rcClient.bottom / 4;
	rcRegion.bottom = rcRegion.top * 3;
	rcRegion.left = rcClient.right / 4;
	rcRegion.right = rcRegion.left * 3;
	hRgn = CreateEllipticRgnIndirect (&rcRegion);

	DrawRadials (hdc, hRgn, rcClient);
	if (bInvert)
		InvertRgn (hdc, hRgn);
	DeleteObject (hRgn);
}

void DoPolyRegion (HWND hWnd, HDC hdc, bool bStar, bool bInvert)
{
RECT	rcClient;
POINT	point[5];
double	fAngle;
int		i;
HRGN hRgn;


//2 * PI / 360

	GetClientRect (hWnd, &rcClient);
	int nArm = rcClient.bottom / 3;
	for (fAngle = PI / 2, i = 0; i < 5; fAngle += 2 * PI / 5, ++i)