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Map_Projection.cpp
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311 lines (258 loc) · 7.88 KB
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#include "StdAfx.h"
#include "Map.h"
#include "GeoProjection.h"
#include "Tiles.h"
#include "ExtentsHelper.h"
#include "ShapeHelper.h"
// some simple encapsulation for readability of code
IGeoProjection* CMapView::GetMapToWgs84Transform()
{
VARIANT_BOOL vb;
_projection->get_HasTransformation(&vb);
return vb ? _projection : nullptr;
}
IGeoProjection* CMapView::GetWgs84ToMapTransform()
{
VARIANT_BOOL vb;
_wgsProjection->get_HasTransformation(&vb);
return vb ? _wgsProjection : nullptr;
}
IGeoProjection* CMapView::GetTilesToMapTransform()
{
VARIANT_BOOL vb;
_tileProjection->get_HasTransformation(&vb);
return vb ? _tileProjection : nullptr;
}
IGeoProjection* CMapView::GetMapToTilesTransform()
{
VARIANT_BOOL vb;
_tileReverseProjection->get_HasTransformation(&vb);
return vb ? _tileReverseProjection : nullptr;
}
IGeoProjection* CMapView::GetWgs84Projection() { return _wgsProjection; }
IGeoProjection* CMapView::GetGMercProjection() { return _gmercProjection; }
IGeoProjection* CMapView::GetMapProjection() { return _projection; }
// *****************************************************
// ReleaseProjections()
// *****************************************************
void CMapView::ReleaseProjections()
{
dynamic_cast<CGeoProjection*>(_projection)->SetIsFrozen(false);
VARIANT_BOOL vb;
_projection->Clear(&vb);
_projection->Release();
_tileProjection->Clear(&vb);
_tileProjection->Release();
_tileReverseProjection->Clear(&vb);
_tileReverseProjection->Release();
_wgsProjection->Clear(&vb);
_wgsProjection->Release();
_gmercProjection->Clear(&vb);
_gmercProjection->Release();
}
// *****************************************************
// InitProjections()
// *****************************************************
void CMapView::InitProjections()
{
ComHelper::CreateInstance(idGeoProjection, (IDispatch**)&_tileProjection); // TODO: Don't use C-style cast
ComHelper::CreateInstance(idGeoProjection, (IDispatch**)&_tileReverseProjection);
ComHelper::CreateInstance(idGeoProjection, (IDispatch**)&_wgsProjection);
ComHelper::CreateInstance(idGeoProjection, (IDispatch**)&_gmercProjection);
_transformationMode = tmNotDefined;
VARIANT_BOOL vb;
_wgsProjection->SetWgs84(&vb); // EPSG:4326
_gmercProjection->SetGoogleMercator(&vb); // EPSG:3857
ComHelper::CreateInstance(idGeoProjection, (IDispatch**)&_projection);
CComPtr<IGeoProjection> p = nullptr;
ComHelper::CreateInstance(idGeoProjection, (IDispatch**)&p);
SetGeoProjection(p);
}
// *****************************************************
// SetGeoProjection()
// *****************************************************
void CMapView::SetGeoProjection(IGeoProjection* pVal)
{
AFX_MANAGE_STATE(AfxGetStaticModuleState());
if (!pVal || pVal == _projection) {
return;
}
bool preserveExtents = _activeLayers.size() == 0;
IExtents* ext = preserveExtents ? GetGeographicExtents() : nullptr; // try to preserve extents
((CGeoProjection*)_projection)->SetIsFrozen(false);
_projection->StopTransform();
ComHelper::SetRef(pVal, (IDispatch**)&_projection);
#ifndef RELEASE_MODE
CComBSTR bStr;
_projection->ExportToProj4(&bStr);
Debug::WriteLine("MAP PROJECTION SET: %s", static_cast<LPWSTR>(bStr));
#endif
_projectionChangeCount++;
UpdateMapTranformation();
UpdateTileProjection();
((CGeoProjection*)_projection)->SetIsFrozen(true);
_projection->get_LinearUnits(&_unitsOfMeasure);
ClearExtentHistory();
// restore extents
if (ext)
{
if (preserveExtents) {
SetGeographicExtents(ext);
}
ext->Release();
}
FireProjectionChanged();
}
// *****************************************************
// UpdateMapTranformation()
// *****************************************************
void CMapView::UpdateMapTranformation()
{
VARIANT_BOOL isEmpty;
_projection->get_IsEmpty(&isEmpty);
// IGeoProjection* gp = nullptr;
_wgsProjection->StopTransform();
if (!isEmpty)
{
VARIANT_BOOL isSame, vb;
CComPtr<IExtents> box = nullptr;
box.Attach(ExtentsHelper::GetWorldBounds());
_wgsProjection->get_IsSameExt(_projection, box, 20, &isSame);
if (isSame)
{
_transformationMode = tmWgs84Complied;
}
else
{
_wgsProjection->StartTransform(_projection, &vb); // must always have transformation to current projection
_transformationMode = vb ? tmDoTransformation : tmNotDefined;
if (!vb) {
ErrorMessage(tkFAILED_TRANSFORM_WGS84_TO_MAP);
}
_projection->StartTransform(_wgsProjection, &vb); // must always have transformation to WGS84
if (!vb) {
ErrorMessage(tkFAILED_TRANSFORM_MAP_TO_WGS84);
}
}
}
else
{
_transformationMode = tmNotDefined;
}
}
// *****************************************************
// GetProjection()
// *****************************************************
IGeoProjection* CMapView::GetGeoProjection(void)
{
AFX_MANAGE_STATE(AfxGetStaticModuleState());
if (_projection)
_projection->AddRef();
return _projection;
}
// ***************************************************************
// ClearMapProjectionWithLastLayer()
// ***************************************************************
void CMapView::ClearMapProjectionWithLastLayer()
{
if (_grabProjectionFromData)
{
VARIANT_BOOL isEmpty;
_projection->get_IsEmpty(&isEmpty);
if (!isEmpty)
{
CComPtr<IGeoProjection> proj = nullptr;
ComHelper::CreateInstance(idGeoProjection, (IDispatch**)&proj);
if (proj)
{
SetGeoProjection(proj);
}
}
}
}
// ***************************************************************
// GeodesicLength()
// ***************************************************************
DOUBLE CMapView::GeodesicLength(IShape* polyline)
{
AFX_MANAGE_STATE(AfxGetStaticModuleState());
if (!polyline)
{
ErrorMessage(tkUNEXPECTED_NULL_PARAMETER);
return 0.0;
}
ShpfileType shpType = ShapeHelper::GetShapeType2D(polyline);
if (shpType != SHP_POLYLINE && shpType != SHP_POLYGON)
{
ErrorMessage(tkUNEXPECTED_SHAPE_TYPE);
return 0.0;
}
VARIANT_BOOL ellipsoid;
_geodesicShape->get_IsUsingEllipsoid(&ellipsoid);
if (!ellipsoid)
{
ErrorMessage(tkFAILED_TRANSFORM_MAP_TO_WGS84);
return 0.0; // Euclidean area can be calculated using Shape.Area, so better to return 0.0
}
_geodesicShape->SetShape(polyline);
double length = 0.0;
_geodesicShape->get_Length(&length);
return length;
}
// ***************************************************************
// GeodesicArea()
// ***************************************************************
DOUBLE CMapView::GeodesicArea(IShape* polygon)
{
AFX_MANAGE_STATE(AfxGetStaticModuleState());
if (!polygon)
{
ErrorMessage(tkUNEXPECTED_NULL_PARAMETER);
return 0.0;
}
ShpfileType shpType = ShapeHelper::GetShapeType2D(polygon);
if (shpType != SHP_POLYGON)
{
ErrorMessage(tkUNEXPECTED_SHAPE_TYPE);
return 0.0;
}
VARIANT_BOOL ellipsoid;
_geodesicShape->get_IsUsingEllipsoid(&ellipsoid);
if (!ellipsoid)
{
ErrorMessage(tkFAILED_TRANSFORM_MAP_TO_WGS84);
return 0.0; // Euclidean area can be calculated using Shape.Area, so better to return 0.0
}
_geodesicShape->SetShape(polygon);
double area = 0.0;
_geodesicShape->get_Area(&area);
return area;
}
// ***************************************************************
// GeodesicDistance()
// ***************************************************************
DOUBLE CMapView::GeodesicDistance(DOUBLE projX1, DOUBLE projY1, DOUBLE projX2, DOUBLE projY2)
{
AFX_MANAGE_STATE(AfxGetStaticModuleState());
IGeoProjection* gp = GetMapToWgs84Transform();
if (!gp) {
ErrorMessage(tkFAILED_TRANSFORM_MAP_TO_WGS84);
return 0.0;
}
VARIANT_BOOL transform;
gp->get_HasTransformation(&transform);
if (_transformationMode == tmNotDefined || !transform) {
ErrorMessage(tkFAILED_TRANSFORM_MAP_TO_WGS84);
return 0.0;
}
VARIANT_BOOL vb, vb2;
gp->Transform(&projX1, &projY1, &vb);
gp->Transform(&projX2, &projY2, &vb2);
if (!vb || !vb2) {
ErrorMessage(tkFAILED_TRANSFORM_MAP_TO_WGS84);
return 0.0;
}
double distance = 0.0;
GetUtils()->GeodesicDistance(projY1, projX1, projY2, projX2, &distance);
return distance;
}