/// <summary>
/// This will add a new label category that will only apply to the specified filter expression. This will not remove any existing categories.
/// </summary>
/// <param name="featureLayer">The feature layer that the labels should be applied to</param>
/// <param name="expression">The string expression where field names are in square brackets</param>
/// <param name="filterExpression">The string filter expression that controls which features are labeled. Field names are in square brackets, strings in single quotes.</param>
/// <param name="symbolizer">The label symbolizer that controls the basic appearance of the labels in this category.</param>
public void AddLabels(IFeatureLayer featureLayer, string expression, string filterExpression, ILabelSymbolizer symbolizer)
{
if (featureLayer.LabelLayer == null) featureLayer.LabelLayer = new MapLabelLayer();
featureLayer.ShowLabels = true;
ILabelCategory lc = new LabelCategory();
lc.Expression = expression;
lc.FilterExpression = filterExpression;
lc.Symbolizer = symbolizer;
featureLayer.LabelLayer.Symbology.Categories.Add(lc);
featureLayer.LabelLayer.CreateLabels();
}
/// <summary>
/// This will add a new label category that will only apply to the specified filter expression. This will not remove any existing categories.
/// </summary>
/// <param name="featureLayer">The feature layer that the labels should be applied to</param>
/// <param name="expression">The string expression where field names are in square brackets</param>
/// <param name="filterExpression">The string filter expression that controls which features are labeled. Field names are in square brackets, strings in single quotes.</param>
/// <param name="symbolizer">The label symbolizer that controls the basic appearance of the labels in this category.</param>
/// <param name="width">A geographic width, so that if the map is zoomed to a geographic width smaller than this value, labels should appear.</param>
public void AddLabels(IFeatureLayer featureLayer, string expression, string filterExpression, ILabelSymbolizer symbolizer, double width)
{
if (featureLayer.LabelLayer == null) featureLayer.LabelLayer = new MapLabelLayer();
featureLayer.ShowLabels = true;
ILabelCategory lc = new LabelCategory();
lc.Expression = expression;
lc.FilterExpression = filterExpression;
lc.Symbolizer = symbolizer;
featureLayer.LabelLayer.UseDynamicVisibility = true;
featureLayer.LabelLayer.DynamicVisibilityWidth = width;
featureLayer.LabelLayer.Symbology.Categories.Add(lc);
featureLayer.LabelLayer.CreateLabels();
}
/// <summary>
/// This activates the labels for the specified feature layer that will be the specified expression
/// where field names are in square brackets like "[Name]: [Value]". This will label all the features,
/// and remove any previous labeling.
/// </summary>
/// <param name="featureLayer">The FeatureLayer to apply the labels to.</param>
/// <param name="expression">The string label expression to use where field names are in square brackets like [Name]</param>
/// <param name="font">The font to use for these labels</param>
/// <param name="fontColor">The color for the labels</param>
public void AddLabels(IFeatureLayer featureLayer, string expression, Font font, Color fontColor)
{
featureLayer.ShowLabels = true;
MapLabelLayer ll = new MapLabelLayer();
ll.Symbology.Categories.Clear();
LabelCategory lc = new LabelCategory();
lc.Expression = expression;
ll.Symbology.Categories.Add(lc);
ILabelSymbolizer ls = ll.Symbolizer;
ls.Orientation = ContentAlignment.MiddleCenter;
ls.BackColorEnabled = false;
ls.BackColorEnabled = false;
ls.FontColor = fontColor;
ls.FontFamily = font.FontFamily.ToString();
ls.FontSize = font.Size;
ls.FontStyle = font.Style;
ls.LabelParts = LabelParts.LabelLargestPart;
featureLayer.LabelLayer = ll;
}