simplemapviewer.cpp

VC和AO的实现图形浏览的功能

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

#include "stdafx.h"
#include "resource.h"
#include <objbase.h>
#include <commdlg.h>

enum CurrentTool
{
	currentToolZoomIn,
	currentToolZoomOut,
	currentToolPan,
};



IMapPtr ipMap;
ITrackCancelPtr ipCancelTracker;

// Cursors
HCURSOR hCursorZoomIn;
HCURSOR hCursorZoomInMove;
HCURSOR hCursorZoomOut;
HCURSOR hCursorZoomOutMove;
HCURSOR hCursorPan;
HCURSOR hCursorPanDrag;



CurrentTool g_currentTool = currentToolZoomIn;



BOOL SelectShapeFile(HWND hWnd, TCHAR** pszDirectory, TCHAR** pszFiles)
{
	OPENFILENAME	ofn;										// common dialog box structure
	TCHAR					szFile[MAX_PATH] = ("\0");  // buffer for file name
	TCHAR					defaultDir[MAX_PATH];
	TCHAR*				title = "Select Shape files";
	DWORD					len = MAX_PATH;

	// Initialize OPENFILENAME
	ZeroMemory(&ofn, sizeof(OPENFILENAME));
	ofn.lStructSize = sizeof(OPENFILENAME);
	ofn.lpstrFilter = ("SHP\0*.shp\0");
	ofn.hwndOwner = (HWND) hWnd;
	ofn.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST | OFN_ALLOWMULTISELECT | OFN_EXPLORER;
	ofn.nMaxFile = MAX_PATH;
	ofn.lpstrFile = szFile;
	ofn.lpstrTitle = title;
	ofn.lpstrInitialDir = defaultDir;
	ofn.nFilterIndex = 1;

	// Display the Open dialog box. 

	if (::GetOpenFileName(&ofn))
	{
		*pszFiles = (char *) malloc(MAX_PATH);
		*pszDirectory = (char *) malloc(ofn.nFileOffset + 1);
		strncpy(*pszDirectory, ofn.lpstrFile, ofn.nFileOffset);
		(*pszDirectory)[ofn.nFileOffset] = '\0';
		memcpy(*pszFiles, (ofn.lpstrFile)+ofn.nFileOffset, ofn.nMaxFile-ofn.nFileOffset);
	}
	else
		return false;

	return true;
}

HRESULT AddClassToMap(IMap* pMap, IFeatureClass* pFeatureClass)
{

	IFeatureLayerPtr ipFeatureLayer(CLSID_FeatureLayer);

	HRESULT hr = ipFeatureLayer->putref_FeatureClass(pFeatureClass);
	if (FAILED(hr)) return hr;

	hr = ipFeatureLayer->put_Visible(VARIANT_FALSE);
	if (FAILED(hr)) return hr;

	CComBSTR bstrName;
	hr = pFeatureClass->get_AliasName(&bstrName);
	if (FAILED(hr)) return hr;

	hr = ipFeatureLayer->put_Name(bstrName);
	if (FAILED(hr)) return hr;

	hr = pMap->AddLayer((ILayerPtr) ipFeatureLayer);
	if (FAILED(hr)) return hr;

	hr = ipFeatureLayer->put_Visible(VARIANT_TRUE);
	if (FAILED(hr)) return hr;

	return S_OK;
}

HRESULT AddClassesToMap(IMap* pMap, ISet* pSet)
{

	HRESULT hr = pSet->Reset();	
	if (FAILED(hr)) return hr;

	//First get all the Envelope and Polygon Layers
	IUnknownPtr ipUnknown;
	IFeatureClassPtr ipFeatureClass;
	esriGeometryType eGeometryType;

	while (pSet->Next(&ipUnknown) == S_OK)
	{
		ipFeatureClass = ipUnknown;
		hr = ipFeatureClass->get_ShapeType(&eGeometryType);
		if (FAILED(hr)) return hr;

		if ((eGeometryType == esriGeometryPolygon) || (eGeometryType == esriGeometryEnvelope))
		{
			hr = AddClassToMap(pMap, ipFeatureClass);
			if (FAILED(hr)) return hr;
		}
		ipFeatureClass = 0;
	}

	// Next get the linear layers
	hr = pSet->Reset();
	while (pSet->Next(&ipUnknown) == S_OK)
	{
		ipFeatureClass = ipUnknown;
		hr = ipFeatureClass->get_ShapeType(&eGeometryType);
		if (FAILED(hr)) return hr;

		if ((eGeometryType == esriGeometryLine) || 
			  (eGeometryType == esriGeometryPath) ||
			  (eGeometryType == esriGeometryBezier3Curve) ||
			  (eGeometryType == esriGeometryCircularArc) ||
			  (eGeometryType == esriGeometryEllipticArc) ||
			  (eGeometryType == esriGeometryPolyline))
		{
			hr = AddClassToMap(pMap, ipFeatureClass);
			if (FAILED(hr)) return hr;
		}
		ipFeatureClass = 0;
	}

	// Finally get the point layers
	hr = pSet->Reset();
	while (pSet->Next(&ipUnknown) == S_OK)
	{
		ipFeatureClass = ipUnknown;
		hr = ipFeatureClass->get_ShapeType(&eGeometryType);
		if (FAILED(hr)) return hr;

		if ((eGeometryType == esriGeometryMultipoint) || 
			  (eGeometryType == esriGeometryPoint))
		{
			hr = AddClassToMap(pMap, ipFeatureClass);
			if (FAILED(hr)) return hr;
		}
		ipFeatureClass = 0;
	}

	// Cleanup the set
	hr = pSet->RemoveAll();
	if (FAILED(hr)) return hr;

	return S_OK;
}


HRESULT AddShapeFiles(IMap* pMap, HWND hWnd)
{
	HRESULT hr;

	IWorkspaceFactoryPtr ipWorkspaceFactory(CLSID_ShapefileWorkspaceFactory);
	IFeatureWorkspacePtr ipFeatureWorkspace;
	// Build a set to hold the classes as we open them
	ISetPtr ipSet(CLSID_Set);


	// Select the Files to load
	char* pszFiles;
	char* pszDirectory;
	if (SelectShapeFile(hWnd, &pszDirectory, &pszFiles))
	{
		BOOL bGotDir = false;
		IWorkspacePtr ipWorkspace;
		// Open up the Shapefile workspace factory using the selected directory
		hr = ipWorkspaceFactory->OpenFromFile(CComBSTR(pszDirectory), (OLE_HANDLE) hWnd, &ipWorkspace);
		if (FAILED(hr)) return hr;
		ipFeatureWorkspace = ipWorkspace;

		char* temp = pszFiles;
		while (strcmp(temp, "") != 0)
		{
			// Loop through each of the shape files and open them
			IFeatureClassPtr ipFeatureClass;
			hr = ipFeatureWorkspace->OpenFeatureClass(CComBSTR(temp), &ipFeatureClass);
			if (FAILED(hr)) return hr;

			// Add the featue class to the set so we can traverse them later
			hr = ipSet->Add((IUnknownPtr) ipFeatureClass);
			if (FAILED(hr)) return hr;

			int iLength = ::strlen(temp);
			temp += iLength + 1;
		}

		// Add the Feature classes to the map by building layers foreach class in this function
		hr = AddClassesToMap(pMap, ipSet);
		if (FAILED(hr)) return hr;

		// Get the extents of the data and set the ActiveView to show the data at its full extent
		IActiveViewPtr ipActiveView(pMap);
		IEnvelopePtr ipEnv;
		hr = ipActiveView->get_FullExtent(&ipEnv);
		if (FAILED(hr)) return hr;
		hr = ipActiveView->put_Extent(ipEnv);
		if (FAILED(hr)) return hr;

		hr = ipActiveView->Refresh();
		if (FAILED(hr)) return hr;
	}

	return S_OK;
}

HRESULT AddData(IMap* pMap, HWND hWnd)
{
	// Use the GxDialog to select the data to add to the map
	IGxDialogPtr ipGxDialog(CLSID_GxDialog);
	ISetPtr	ipSet(CLSID_Set);

	// Set the Filter to FeatureDatasets and FeatureClasses
	IGxObjectFilterPtr ipGxObjectFilter(CLSID_GxFilterFeatureDatasetsAndFeatureClasses);
	HRESULT hr = ipGxDialog->putref_ObjectFilter(ipGxObjectFilter);
	if (FAILED(hr)) return hr;
	hr = ipGxDialog->put_AllowMultiSelect(VARIANT_TRUE);
	if (FAILED(hr)) return hr;
	hr = ipGxDialog->put_Title(CComBSTR("Select Data"));
	if (FAILED(hr)) return hr;

	IEnumGxObjectPtr ipEnumGxObject;
	VARIANT_BOOL bResult;
	hr = ipGxDialog->DoModalOpen((OLE_HANDLE) hWnd, &ipEnumGxObject, &bResult);
	if (FAILED(hr)) return hr;

	if (bResult == VARIANT_FALSE)
		return S_OK;

	hr = ipEnumGxObject->Reset();
	if (FAILED(hr)) return hr;

	// Enumerate through the GxObjects
	IGxObjectPtr ipGxObject;
	while (ipEnumGxObject->Next(&ipGxObject) == S_OK)
	{
		IGxDatasetPtr ipGxDataset(ipGxObject);
		if (ipGxDataset != 0)
		{
			// If the GxObject contains is a esriDTFeatureClass add the class to the set
			esriDatasetType eDatasetType;
			hr = ipGxDataset->get_Type(&eDatasetType);
			if (FAILED(hr)) return hr;
			if (eDatasetType == esriDTFeatureClass)
			{
				IDatasetPtr ipDataset;
				hr = ipGxDataset->get_Dataset(&ipDataset);
				if (FAILED(hr)) return hr;

				hr = ipSet->Add((IUnknownPtr) ipDataset);
				if (FAILED(hr)) return hr;
			}
			else if (eDatasetType == esriDTFeatureDataset)
			{
				// If the OxObject is a DTFeatureDataset get the feature classes
				// from add them to the set
				IDatasetPtr ipDataset;
				hr = ipGxDataset->get_Dataset(&ipDataset);
				if (FAILED(hr)) return hr;

				IFeatureClassContainerPtr ipFCCont(ipDataset);

				long lNumClasses;
				hr = ipFCCont->get_ClassCount(&lNumClasses);
				if (FAILED(hr)) return hr;

				IFeatureClassPtr ipFeatureClass;
				for (long i = 0; i < lNumClasses; i++)
				{
					hr = ipFCCont->get_Class(i, &ipFeatureClass);
					if (FAILED(hr)) return hr;

					hr = ipSet->Add((IUnknownPtr) ipFeatureClass);
					if (FAILED(hr)) return hr;
				}
			}
		}
	}

	// Add all the feature classes to the Map
	hr = AddClassesToMap(pMap, ipSet);
	if (FAILED(hr)) return hr;

	// Update the Map view
	IActiveViewPtr ipActiveView(pMap);
	IEnvelopePtr ipEnv;
	hr = ipActiveView->get_FullExtent(&ipEnv);
	if (FAILED(hr)) return hr;
	hr = ipActiveView->put_Extent(ipEnv);
	if (FAILED(hr)) return hr;

	hr = ipActiveView->Refresh();
	if (FAILED(hr)) return hr;

	return S_OK;
}

HRESULT RemoveAllData(IMap* pMap)
{
	HRESULT hr;

	// Clear out the Layers from the Map
	hr = pMap->ClearLayers();
	if (FAILED(hr)) return hr;
	IStandaloneTableCollectionPtr ipTables(pMap);
	if (ipTables)
	{
		hr = ipTables->RemoveAllStandaloneTables();
		if (FAILED(hr)) return hr;
	}
	IActiveViewPtr ipActiveView(pMap);
	hr = ipActiveView->Refresh();
	if (FAILED(hr)) return hr;

	return S_OK;
}


void PaintDialog(HDC hDC, IMap* pMap, ITrackCancel* pTrackCancel)
{
	if (pMap == 0)
		return;

	IActiveViewPtr ipActiveView(pMap);

	ipActiveView->Draw((OLE_HANDLE) hDC, 0);
	pTrackCancel->Reset();
}

HRESULT ToolEventMouseDown(HWND hWndPicBox, long X, long Y, IPoint** pPoint)
{
	// Delete with the Mouse down event depending on which tool is active
	IActiveViewPtr ipActiveView(ipMap);
	IScreenDisplayPtr ipScreenDisplay;
	HRESULT hr = ipActiveView->get_ScreenDisplay(&ipScreenDisplay);
	if (FAILED(hr)) return hr;

	IDisplayTransformationPtr ipDisplayTransformation;
	hr = ipScreenDisplay->get_DisplayTransformation(&ipDisplayTransformation);
	if (FAILED(hr)) return hr;

	hr = ipDisplayTransformation->ToMapPoint(X, Y, pPoint);
	if (FAILED(hr)) return hr;

	if (g_currentTool == currentToolPan)
	{
		hr = ipScreenDisplay->PanStart(*pPoint);
		if (FAILED(hr)) return hr;
	}	

	return S_OK;
}

HRESULT ToolEventMouseUp(HWND hWndPicBox, long X, long Y, INewEnvelopeFeedback *pDisplayFeedback)
{
	// Complete the action of the tool depending upon which tool is currently active
	IActiveViewPtr ipActiveView(ipMap);
	IScreenDisplayPtr ipScreenDisplay;
	HRESULT hr = ipActiveView->get_ScreenDisplay(&ipScreenDisplay);
	if (FAILED(hr)) return hr;