private static List <ArcmapPickCandidate> FindPickCandidates(
IPoint mapPoint, List <IFeatureLayer> pickLayers, double mapScale, double searchTolerance)
{
List <ArcmapPickCandidate> result = new List <ArcmapPickCandidate>();
if (pickLayers.Count > 0)
{
IEnvelope searchEnvelope = mapPoint.Envelope;
searchEnvelope.Expand(searchTolerance, searchTolerance, false);
foreach (IFeatureLayer pickLayer in pickLayers)
{
if (ArcmapLayerUtils.LayerIsVisible(pickLayer, mapScale))
{
IIdentify identifier = pickLayer as IIdentify;
IArray elements = identifier.Identify(searchEnvelope);
foreach (object element in elements.Enumerate())
{
IFeature feature = (element as IRowIdentifyObject).Row as IFeature;
double distance;
IPoint footPoint;
CalculateNearestDistanceToFeature(mapPoint, feature, out distance, out footPoint);
ArcmapPickCandidate ranking = new ArcmapPickCandidate(element as IIdentifyObj, distance);
result.Add(ranking);
}
}
}
}
return(result);
}
/// <summary>
/// Can be called from the mouse up event of the ArcMap tool.
/// </summary>
/// <param name="x">Clicked x coordinate.</param>
/// <param name="y">Clicked y coordinate.</param>
/// <returns>The picked feature candidate or null if no feature was picked.</returns>
public ArcmapPickCandidate OnMouseUp(int x, int y)
{
ArcmapPickCandidate result = null;
IScreenDisplay screenDisplay = ArcmapUtils.FocusMapToScreenDisplay(FocusMap);
IPoint mapPoint = TransformMousePositionToMapPoint(x, y, screenDisplay);
double searchTolerance = ArcmapUtils.PixelsToDistance(_snapTolerance, screenDisplay);
double mapScale = GetCurrentMapScale(screenDisplay);
List <ArcmapPickCandidate> pickCandidates = FindPickCandidates(mapPoint, _pickLayers, mapScale, searchTolerance);
SortPickCandidates(pickCandidates);
if (pickCandidates.Count == 1)
{
result = pickCandidates[0];
}
else if (pickCandidates.Count > 1)
{
System.Drawing.Point position = new System.Drawing.Point(x + popupShiftH, y + popupShiftV);
ContextMenuStrip menu = BuildContextMenu(pickCandidates);
menu.Opacity = 0.9;
_selectedCandidate = null;
ContextMenuUtils.ShowContextMenu(menu, position, (IntPtr)ArcmapUtils.FocusMapToScreenDisplay(FocusMap).hWnd);
if (_selectedCandidate != null)
{
result = _selectedCandidate;
}
}
return(result);
}
private void contextMenuItem_Select(object sender, EventArgs e)
{
object menuTag = ((ToolStripItem)sender).Tag;
ArcmapPickCandidate candidate = (ArcmapPickCandidate)menuTag;
ArcmapUtils.FlashFeature(candidate.Feature, ArcmapUtils.FocusMapToScreenDisplay(FocusMap));
}
/// <summary>
/// Compares the candidate with another candidate, to determine the favorited candidate.
/// </summary>
/// <param name="other">Other candidate to compare with.</param>
/// <returns>Returns a value, indicating which one is the better candidate.</returns>
public int CompareTo(ArcmapPickCandidate other)
{
int result = GeometryType.CompareTo(other.GeometryType);
if (result == 0)
{
result = DistanceToClickPoint.CompareTo(other.DistanceToClickPoint);
}
return(result);
}
private void contextMenuItem_Click(object sender, EventArgs e)
{
object menuTag = ((ToolStripItem)sender).Tag;
_selectedCandidate = (ArcmapPickCandidate)menuTag;
}