/// <summary>
/// Highlighting shapes with a mouse over is something that also needs to be undone when the
/// mouse leaves. This test handles changing the colors back to normal when the mouse leaves a shape.
/// </summary>
/// <param name="e">The GeoMouseArgs parameter contains information about the mouse location and geographic coordinates.</param>
/// <returns>Boolean, true if mapframe initialize (or visual change) is necessary.</returns>
private bool ShapeRemoveHighlight(GeoMouseArgs e)
{
// If no shapes have ever been highlighted, this is meaningless.
if (_oldCategory == null)
{
return(false);
}
Rectangle mouseRect = new Rectangle(_mousePosition.X - 3, _mousePosition.Y - 3, 6, 6);
Extent ext = Map.PixelToProj(mouseRect);
MapPointLayer mpl = _layer as MapPointLayer;
bool requiresInvalidate = false;
IPolygon env = ext.ToEnvelope().ToPolygon();
if (mpl != null)
{
int w = 3;
int h = 3;
PointCategory pc = mpl.GetCategory(_activeFeature) as PointCategory;
if (pc != null)
{
if (pc.Symbolizer.ScaleMode != ScaleMode.Geographic)
{
w = (int)pc.Symbolizer.GetSize().Width;
h = (int)pc.Symbolizer.GetSize().Height;
}
}
Rectangle rect = new Rectangle(e.Location.X - (w / 2), e.Location.Y - (h / 2), w * 2, h * 2);
if (!rect.Contains(Map.ProjToPixel(_activeFeature.Geometry.Coordinates[0])))
{
mpl.SetCategory(_activeFeature, _oldCategory);
_activeFeature = null;
requiresInvalidate = true;
}
}
else
{
if (!_activeFeature.Geometry.Intersects(env))
{
_layer.SetCategory(_activeFeature, _oldCategory);
_activeFeature = null;
requiresInvalidate = true;
}
}
return(requiresInvalidate);
}
/// <summary>
/// Before a shape is selected, moving the mouse over a shape will highlight that shape by changing
/// its appearance. This tests features to determine the first feature to qualify as the highlight.
/// </summary>
/// <param name="e">The GeoMouseArgs parameter contains information about the mouse location
/// and geographic coordinates.</param>
/// <returns>A value indicating whether the shape was successfully highlighted.</returns>
private bool ShapeHighlight(GeoMouseArgs e)
{
if (e == null)
{
throw new ArgumentNullException("e", "e is null.");
}
Rectangle mouseRect = new Rectangle(_mousePosition.X - 3, _mousePosition.Y - 3, 6, 6);
Extent ext = Map.PixelToProj(mouseRect);
IPolygon env = ext.ToEnvelope().ToPolygon();
bool requiresInvalidate = false;
foreach (IFeature feature in _featureSet.Features)
{
if (_featureSet.FeatureType == FeatureType.Point || _featureSet.FeatureType == FeatureType.MultiPoint)
{
MapPointLayer mpl = _layer as MapPointLayer;
if (mpl != null)
{
int w = 3;
int h = 3;
PointCategory pc = mpl.GetCategory(feature) as PointCategory;
if (pc != null)
{
if (pc.Symbolizer.ScaleMode != ScaleMode.Geographic)
{
Size2D size = pc.Symbolizer.GetSize();
w = (int)size.Width;
h = (int)size.Height;
}
}
_imageRect = new Rectangle(e.Location.X - (w / 2), e.Location.Y - (h / 2), w, h);
if (_imageRect.Contains(Map.ProjToPixel(feature.Geometry.Coordinates[0])))
{
_activeFeature = feature;
_oldCategory = mpl.GetCategory(feature);
if (_selectedCategory == null)
{
_selectedCategory = _oldCategory.Copy();
_selectedCategory.SetColor(Color.Red);
_selectedCategory.LegendItemVisible = false;
}
mpl.SetCategory(_activeFeature, _selectedCategory);
}
}
requiresInvalidate = true;
}
else
{
if (feature.Geometry.Intersects(env))
{
_activeFeature = feature;
_oldCategory = _layer.GetCategory(_activeFeature);
if (_featureSet.FeatureType == FeatureType.Polygon)
{
IPolygonCategory pc = _activeCategory as IPolygonCategory;
if (pc == null)
{
_activeCategory = new PolygonCategory(Color.FromArgb(55, 255, 0, 0), Color.Red, 1)
{
LegendItemVisible = false
};
}
}
if (_featureSet.FeatureType == FeatureType.Line)
{
ILineCategory pc = _activeCategory as ILineCategory;
if (pc == null)
{
_activeCategory = new LineCategory(Color.Red, 3)
{
LegendItemVisible = false
};
}
}
_layer.SetCategory(_activeFeature, _activeCategory);
requiresInvalidate = true;
}
}
}
return(requiresInvalidate);
}