private double CalcScale()
{
double phi = 0.0;
if (_mapUnits == GeoUnits.DecimalDegrees)
{
phi = Math.Min(90.0, m_actMaxY) * 0.5 + Math.Max(-90.0, m_actMinY) * 0.5;
}
double w = Math.Abs(m_actMaxX - m_actMinX);
double h = Math.Abs(m_actMaxY - m_actMinY);
GeoUnitConverter converter = new GeoUnitConverter();
double dpu = converter.Convert(1.0, GeoUnits.Meters, _mapUnits, 1, phi);
double s1 = iWidth > 0 ? Math.Abs(w) / iWidth * dpm : 1; s1 /= dpu;
double s2 = iHeight > 0 ? Math.Abs(h) / iHeight * dpm : 1; s2 /= dpu;
double scale = iWidth > 0 && iHeight > 0 ? Math.Max(s1, s2) : Math.Max(mapScale, 1);
return(scale);
#region Old
/*
* double phi1 = 0.0, phi2 = 0.0;
* if (_mapUnits == GeoUnits.DecimalDegrees)
* {
* phi1 = Math.Abs(m_actMinY);
* phi2 = Math.Abs(m_actMaxY);
* }
*
* double w = Math.Abs(m_actMaxX - m_actMinX);
* double h = Math.Abs(m_actMaxY - m_actMinY);
*
* GeoUnitConverter converter = new GeoUnitConverter();
* double Wm = converter.Convert(w, _mapUnits, GeoUnits.Meters, 1, Math.Min(phi1, phi2));
* double Hm = converter.Convert(h, _mapUnits, GeoUnits.Meters);
*
* double s1 = Math.Abs(Wm) / iWidth * dpm;
* double s2 = Math.Abs(Hm) / iHeight * dpm;
* double scale = Math.Max(s1, s2);
*
* return scale;
*/
#endregion
}
private void CalcExtent(double scale, double cx, double cy)
{
double phi = 0.0;
if (_mapUnits == GeoUnits.DecimalDegrees)
{
phi = m_actMaxY * 0.5 + m_actMinY * 0.5;
}
GeoUnitConverter converter = new GeoUnitConverter();
double dpu = converter.Convert(1.0, GeoUnits.Meters, _mapUnits, 1, phi);
double w = (iWidth / dpm) * scale; w *= dpu;
double h = (iHeight / dpm) * scale; h *= dpu;
m_actMinX = cx - w * 0.5;
m_actMaxX = cx + w * 0.5;
m_actMinY = cy - h * 0.5;
m_actMaxY = cy + h * 0.5;
#region Old
/*
* double Wm = (iWidth / dpm) * scale;
* double Hm = (iHeight / dpm) * scale;
*
* double phi = 0.0;
* if (_mapUnits == GeoUnits.DecimalDegrees)
* {
* phi = m_actMaxY * 0.5 + m_actMinY * 0.5;
* }
* GeoUnitConverter converter = new GeoUnitConverter();
* double w = converter.Convert(Wm, GeoUnits.Meters, _mapUnits, 1, phi);
* double h = converter.Convert(Hm, GeoUnits.Meters, _mapUnits);
*
* m_actMinX = cx - w * 0.5;
* m_actMaxX = cx + w * 0.5;
* m_actMinY = cy - h * 0.5;
* m_actMaxY = cy + h * 0.5;
* */
#endregion
}
