private void refreshScalebar()
{
if (Map == null || double.IsNaN(getMapResolution()))
{
return;
}
ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit outUnit = ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Undefined;
double outResolution;
#region KiloMeters/Meters
double roundedKiloMeters = getBestEstimateOfValue(getMapResolution(), ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Kilometers, out outUnit, out outResolution);
double widthMeters = roundedKiloMeters / outResolution;
bool inMeters = outUnit == ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Meters;
if (PaddingLeftForScaleBarTextMeters != null &&
PaddingLeftForScaleBarTextMeters != null &&
ScaleBarTextForMeters != null)
{
PaddingLeftForScaleBarTextMeters.Width = widthMeters;
PaddingLeftTopNotch.Width = widthMeters;
ScaleBarTextForMeters.Text = string.Format("{0}{1}", roundedKiloMeters, (inMeters ? LocalizableStrings.ScaleBarUnit_meters : LocalizableStrings.ScaleBarUnit_kilometers));
ScaleBarTextForMeters.Width = widthMeters;
}
#endregion
#region Miles
double roundedMiles = getBestEstimateOfValue(getMapResolution(), ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Miles, out outUnit, out outResolution);
double widthMiles = roundedMiles / outResolution;
bool inFeet = outUnit == ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Feet;
if (PaddingLeftForScaleBarTextMiles != null &&
PaddingLeftBottomNotch != null &&
ScaleBarTextForMiles != null)
{
PaddingLeftForScaleBarTextMiles.Width = widthMiles;
PaddingLeftBottomNotch.Width = widthMiles;
ScaleBarTextForMiles.Text = string.Format("{0}{1}", roundedMiles, inFeet ? LocalizableStrings.ScaleBarUnit_feet : LocalizableStrings.ScaleBarUnit_miles);
ScaleBarTextForMiles.Width = widthMiles;
}
#endregion
if (roundedMiles == double.NaN || roundedKiloMeters == double.NaN && this.Visibility == Visibility.Visible)
{
this.Visibility = Visibility.Collapsed;
}
if (ScaleBarBlock != null)
{
double widthOfNotches = 4; // 2 for left notch, 2 for right notch
double scaleBarBlockWidth = (widthMiles > widthMeters) ? widthMiles : widthMeters;
scaleBarBlockWidth += widthOfNotches;
if (!double.IsNaN(scaleBarBlockWidth))
{
ScaleBarBlock.Width = scaleBarBlockWidth;
}
}
}
private double getBestEstimateOfValue(double resolution, ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit displayUnit, out ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit unit, out double outResolution)
{
unit = displayUnit;
double rounded = 0;
double originalRes = resolution;
while (rounded < 0.5)
{
resolution = originalRes;
if (MapUnit == MapUnit.DecimalDegrees)
{
resolution = getResolutionForGeographic(Map.Extent.GetCenter(), resolution);
resolution = resolution * (int)ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Meters / (int)unit;
}
else if (webMercSref.Equals(Map.SpatialReference))
{
//WebMercator
MapPoint center = Map.Extent.GetCenter();
center.X = Math.Min(Math.Max(center.Y, -20037508.3427892), 20037508.3427892);
MapPoint center2 = merc.ToGeographic(new MapPoint(Math.Min(center.X + getMapResolution(), 20037508.3427892), center.Y)) as MapPoint;
center = merc.ToGeographic(center) as MapPoint;
resolution = getResolutionForGeographic(center, center2.X - center.X);
resolution = resolution * (int)ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Meters / (int)unit;
}
else if (MapUnit != MapUnit.Undefined)
{
resolution = resolution * (int)MapUnit / (int)unit;
}
double val = TargetWidth * resolution;
val = roundToSignificant(val, resolution);
double noFrac = Math.Round(val); // to get rid of the fraction
if (val < 0.5)
{
ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit newUnit = ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Undefined;
// Automatically switch unit to a lower one
if (unit == ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Kilometers)
{
newUnit = ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Meters;
}
else if (unit == ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Miles)
{
newUnit = ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Feet;
}
if (newUnit == ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Undefined)
{
break;
} //no lower unit
unit = newUnit;
}
else if (noFrac > 1)
{
rounded = noFrac;
var len = noFrac.ToString().Length;
if (len <= 2)
{
// single/double digits ... make it a multiple of 5 ..or 1,2,3,4
if (noFrac > 5)
{
rounded -= noFrac % 5;
}
while (rounded > 1 && (rounded / resolution) > TargetWidth)
{
// exceeded maxWidth .. decrement by 1 or by 5
double decr = noFrac > 5 ? 5 : 1;
rounded = rounded - decr;
}
}
else if (len > 2)
{
rounded = Math.Round(noFrac / Math.Pow(10, len - 1)) * Math.Pow(10, len - 1);
if ((rounded / resolution) > TargetWidth)
{
// exceeded maxWidth .. use the lower bound instead
rounded = Math.Floor(noFrac / Math.Pow(10, len - 1)) * Math.Pow(10, len - 1);
}
}
}
else
{ // anything between 0.5 and 1
rounded = Math.Floor(val);
if (rounded == 0)
{
//val >= 0.5 but < 1 so round up
rounded = (val == 0.5) ? 0.5 : 1;
if ((rounded / resolution) > TargetWidth)
{
// exceeded maxWidth .. re-try by switching to lower unit
rounded = 0;
ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit newUnit = ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Undefined;
// Automatically switch unit to a lower one
if (unit == ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Kilometers)
{
newUnit = ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Meters;
}
else if (unit == ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Miles)
{
newUnit = ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Feet;
}
if (newUnit == ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Undefined)
{
break;
} //no lower unit
unit = newUnit;
}
}
}
}
outResolution = resolution;
return(rounded);
}
private void refreshScalebar()
{
Visibility viz = Visibility.Visible;
if (Map == null || double.IsNaN(Map.Resolution) ||
MapUnit == ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.DecimalDegrees && Math.Abs(Map.Extent.GetCenter().Y) >= 90)
{
viz = Visibility.Collapsed;
}
if (LayoutRoot != null)
{
LayoutRoot.Visibility = viz;
}
if (viz == Visibility.Collapsed)
{
return;
}
ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit outUnit = ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Undefined;
double outResolution;
#region KiloMeters/Meters
double roundedKiloMeters = getBestEstimateOfValue(Map.Resolution, ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Kilometers, out outUnit, out outResolution);
double widthMeters = roundedKiloMeters / outResolution;
bool inMeters = outUnit == ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Meters;
if (PaddingLeftForScaleBarTextMeters != null)
{
PaddingLeftForScaleBarTextMeters.Width = widthMeters;
}
if (PaddingLeftTopNotch != null)
{
PaddingLeftTopNotch.Width = widthMeters;
}
if (ScaleBarTextForMeters != null)
{
ScaleBarTextForMeters.Text = string.Format("{0}{1}", roundedKiloMeters, (inMeters ? "m" : "km"));
ScaleBarTextForMeters.Width = widthMeters;
}
#endregion
#region Miles
double roundedMiles = getBestEstimateOfValue(Map.Resolution, ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Miles, out outUnit, out outResolution);
double widthMiles = roundedMiles / outResolution;
bool inFeet = outUnit == ESRI.ArcGIS.Client.Toolkit.ScaleLine.ScaleLineUnit.Feet;
if (PaddingLeftForScaleBarTextMiles != null)
{
PaddingLeftForScaleBarTextMiles.Width = widthMiles;
}
if (PaddingLeftBottomNotch != null)
{
PaddingLeftBottomNotch.Width = widthMiles;
}
if (ScaleBarTextForMiles != null)
{
ScaleBarTextForMiles.Text = string.Format("{0}{1}", roundedMiles, inFeet ? "ft" : "mi");
ScaleBarTextForMiles.Width = widthMiles;
}
#endregion
double widthOfNotches = 4; // 2 for left notch, 2 for right notch
double scaleBarBlockWidth = (widthMiles > widthMeters) ? widthMiles : widthMeters;
scaleBarBlockWidth += widthOfNotches;
if (!double.IsNaN(scaleBarBlockWidth) && ScaleBarBlock != null)
{
ScaleBarBlock.Width = scaleBarBlockWidth;
}
}
