CMapPin - A Map Pin Implementation

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Introduction

Welcome to CMapPin, a freeware MFC classes to provide map pins useful in GIS applications. If you have Microsoft AutoRoute Express (I think it's called AutoMap in the US) installed, you will probably have seem what I am talking about.

Here's a small sample of what the map pins look like when overlaid on a bitmap map:

Features

Usage

History

API Reference

Planned Enhancements

Contacting the Author

Features

• Standard CWnd derived class which can be used just like any other MFC control classes (e.g. CStatic) which are derived from CWnd.
• Support for tooltips, drag / drop and context menus is built in.
• For further customization, you can derive a class from it.
• The class is fully Unicode compliant and includes Unicode built options in the workspace file.

Usage

• To use the class in your code simply include mappin.cpp in your project and #include mappin.h in which ever of your modules needs to make calls to the class.
• Attach an icon to the map pin using SetIcon() and then call Create() to actually create the map pin. That's it. You should now see the map pin on your window.
• You should also have a look at the demo program to see exact details of how to use the map pins.

History

V1.0 (13th May 1998)

• Initial public release.

V1.01 (12th September 1998)

• Fixed a small redraw glitch in SetIcon().

API Reference

The API consists of the the public member functions of the class CMapPin:

CMapPin
~CMapPin
Create
SetIcon
GetIcon
SetPopupMenu
SetAllowDrag
GetAllowDrag

CMapPin::CMapPin

CMapPin();

Remarks:
Standard C++ constructor. Just initializes internal variables to a default value.

CMapPin::~CMapPin

~CMapPin();

Remarks:
Standard C++ destructor. Internally it will free any resources used by this instance.

CMapPin::Create

BOOL Create(LPCTSTR lpszTooltipText, DWORD dwStyle, const CPoint& p, CWnd* pParent, UINT nID);

Return Value:
Nonzero if successful; otherwise 0.

Parameters:

• lpszTooltipText -- Specifies the tooltip text to use for the control. If NULL, no text will be visible.
• dwStyle -- Specifies the control's window style. Normally this will just be WS_CHILD and WS_VISIBLE.
• p -- Specifies the position of the control. The size will be taken from the attached icon.
• pParentWnd -- Specifies the control's parent window, usually your CView derived class. It must not be NULL.
• nID -- Specifies the control's control ID.

Remarks:
Construct a CMapPin object in three steps. First call the constructor, then SetIcon() and then call Create(), which creates the Windows control and attaches it to the CMapPin object.

Apply the following window styles to a map pin control:

• WS_CHILD: Always
• WS_VISIBLE: Usually
• WS_DISABLED: Rarely

CMapPin::SetIcon

BOOL SetIcon(HINSTANCE hModule, LPCTSTR lpszResourceName, BOOL bSmallIcon);
BOOL SetIcon(HINSTANCE hModule, UINT nIDResource, BOOL bSmallIcon);

Return Value:
Nonzero if successful; otherwise 0.

Parameters:

• hModule -- Handle to an instance of the module whose executable file contains the icon to be loaded.
• lpszResourceName -- Pointer to a null-terminated string that contains the name of the icon resource to be loaded.
• nIDResource -- The resource identifier of the icon resource to be loaded.
• bSmallIcon -- Specifies whether a small (16 * 16) icon is being loaded, FALSE indicates that a standard 32 * 32 icon is being loaded.

Remarks:
Modifies the icon to be displayed on the map pin.

CMapPin::GetIcon

HICON GetIcon() const;

Return Value:
Returns the handle of the icon currently being used by this map pin instance.

CMapPin::SetPopupMenu

void SetPopupMenu(LPCTSTR pszResourceName);
void SetPopupMenu(UINT nIDResource);

Parameters:

• lpszResourceName -- Pointer to a null-terminated string that contains the name of the icon resource to be used.
• nIDResource -- The resource identifier of the icon resource to be used.

Remarks:
Sets which menu resource will be used in context menus for this map pin instance.

CMapPin::SetAllowDrag

void SetAllowDrag(BOOL bAllowDrag);

Parameters:

• bAllowDrag -- TRUE if you want to allow the map pin be dragable, FALSE will disallow dragging.

Remarks:
Changes whether or not the map pin can be dragged around.

CMapPin::GetAllowDrag

BOOL GetAllowDrag() const;

Return Value:
TRUE if the instance allows dragging, otherwise FALSE.

Planned Enhancements

• If you have any other suggested improvements, please let me know so that I can incorporate them into the next release.

Contacting the Author

PJ Naughter
Email: pjn@indigo.ie
Web: http://www.naughter.com
12th September 1998