void ProjectionDlg::AskStatePlane()
{
// Pop up choices for State Plane
StatePlaneDlg dialog(this, 201, _("Select State Plane"));
if (dialog.ShowModal() != wxID_OK)
return;
StatePlaneInfo *plane_info = GetStatePlaneTable();
int selection = dialog.m_iStatePlane;
int bNAD83 = !dialog.m_bNAD27;
int usgs_code = plane_info[selection].usgs_code;
OGRErr result;
if (dialog.m_bFeet)
result = m_proj.SetStatePlane(usgs_code, bNAD83, SRS_UL_FOOT, GetMetersPerUnit(LU_FEET_INT));
else if (dialog.m_bFeetUS)
result = m_proj.SetStatePlane(usgs_code, bNAD83, SRS_UL_US_FOOT, GetMetersPerUnit(LU_FEET_US));
else
result = m_proj.SetStatePlane(usgs_code, bNAD83);
if (result == OGRERR_FAILURE)
{
wxMessageBox(_("Couldn't set state plane projection. Perhaps the\n EPSG tables could not be located. Check that your\n GEOTIFF_CSV environment variable is set."));
}
else
{
SetUIFromProjection();
}
}
double MgdFeatureInfoRenderer::GetDrawingScale()
{
// compute drawing scale
// drawing scale is map scale converted to [mapping units] / [pixels]
double metersPerPixel = METERS_PER_INCH / m_dpi;
return m_mapScale * metersPerPixel / GetMetersPerUnit();
}
void ProjectionDlg::OnHorizUnits( wxCommandEvent &event )
{
TransferDataFromWindow();
m_iUnits = m_pHorizCtrl->GetSelection();
LinearUnits iUnits = (LinearUnits) (long int) m_pHorizCtrl->GetClientData(m_iUnits);
if (iUnits == LU_METERS)
{
m_proj.SetLinearUnits(SRS_UL_METER, 1.0);
}
if (iUnits == LU_FEET_INT)
{
m_proj.SetLinearUnits(SRS_UL_FOOT, GetMetersPerUnit(iUnits));
}
if (iUnits == LU_FEET_US)
{
m_proj.SetLinearUnits(SRS_UL_US_FOOT, GetMetersPerUnit(iUnits));
}
TransferDataToWindow();
UpdateControlStatus();
}
/**
* Determine the approximate spacing, in meters, between each grid cell, in the X
* direction. The result is placed in the m_fSpacing member for use in shading.
*/
void vtElevLayer::DetermineMeterSpacing()
{
vtProjection &proj = m_pGrid->GetProjection();
if (proj.IsGeographic())
{
const DRECT &area = m_pGrid->GetEarthExtents();
const double fToMeters = EstimateDegreesToMeters((area.bottom + area.top)/2);
m_fSpacing = (float) (area.Width()) * fToMeters / (m_pGrid->NumColumns() - 1);
}
else
{
// Linear units-based projections are much simpler
const DPoint2 &spacing = m_pGrid->GetSpacing();
m_fSpacing = spacing.x * GetMetersPerUnit(proj.GetUnits());
}
}