private void AddValueCircleLegendItems(LegendAdornmentLayer legendAdornmentLayer)
{
ValueCircleStyle valueCircleStyle = (ValueCircleStyle)currentStyleBuilder.GetStyles(currentFeatureLayer.FeatureSource)[0];
// Here we generate 4 legend items, with the area of 160, 320, 640 and 1280 square pixels seperately.
int[] circleAreas = new int[] { 160, 320, 640, 1280 };
foreach (int circleArea in circleAreas)
{
LegendItem legendItem = new LegendItem();
double radius = Math.Sqrt(circleArea / Math.PI);
legendItem.ImageStyle = new PointStyle(PointSymbolType.Circle, new GeoSolidBrush(valueCircleStyle.InnerColor), new GeoPen(new GeoSolidBrush(valueCircleStyle.OuterColor)), (int)(radius * 2));
AreaStyle maskStyle = new AreaStyle(new GeoPen(GeoColor.StandardColors.LightGray, 1), new GeoSolidBrush(GeoColor.SimpleColors.Transparent));
legendItem.ImageMask = maskStyle;
legendItem.ImageWidth = 48;
legendItem.TextTopPadding = 16;
legendItem.TextRightPadding = 5;
legendItem.BottomPadding = 16;
legendItem.TopPadding = 16;
legendItem.RightPadding = 5;
double drawingRadius = circleArea / valueCircleStyle.DrawingRadiusRatio * valueCircleStyle.BasedScale / valueCircleStyle.DefaultZoomLevel.Scale;
double ratio = (valueCircleStyle.MaxValidValue - valueCircleStyle.MinValidValue) / (valueCircleStyle.MaxCircleAreaInDefaultZoomLevel - valueCircleStyle.MinCircleAreaInDefaultZoomLevel);
double resultValue = (drawingRadius - valueCircleStyle.MinCircleAreaInDefaultZoomLevel) * ratio + valueCircleStyle.MinValidValue;
string text = TextFormatter.GetFormatedStringForLegendItem(valueCircleStyle.ColumnName, resultValue);
legendItem.TextStyle = new TextStyle(text, new GeoFont("Segoe UI", 10), new GeoSolidBrush(GeoColor.SimpleColors.Black));
legendAdornmentLayer.LegendItems.Add(legendItem);
}
}
protected override Collection <Style> GetStylesCore(FeatureSource featureSource)
{
// here we generate a ValueCircle Style.
double minValue = double.MaxValue;
double maxValue = double.MinValue;
featureSource.Open();
for (int i = 0; i < featureSource.GetCount(); i++)
{
Feature feature = featureSource.GetFeatureById((i + 1).ToString(CultureInfo.InvariantCulture), SelectedColumns);
double columnValue;
if (double.TryParse(feature.ColumnValues[SelectedColumns[0]], out columnValue))
{
if (columnValue < minValue)
{
minValue = columnValue;
}
else if (columnValue > maxValue)
{
maxValue = columnValue;
}
}
}
featureSource.Close();
ValueCircleStyle valueCircleStyle = new ValueCircleStyle();
valueCircleStyle.ColumnName = SelectedColumns[0];
valueCircleStyle.DrawingRadiusRatio = radiusRatio;
valueCircleStyle.MinValidValue = minValue;
valueCircleStyle.MaxValidValue = maxValue;
valueCircleStyle.MinCircleAreaInDefaultZoomLevel = 80;
valueCircleStyle.MaxCircleAreaInDefaultZoomLevel = 10000;
valueCircleStyle.InnerColor = GeoColor.FromArgb(this.Opacity, Color);
valueCircleStyle.OuterColor = GeoColor.SimpleColors.White;
return(new Collection <Style>()
{
valueCircleStyle
});
}
protected override Collection<Style> GetStylesCore(FeatureSource featureSource)
{
// here we generate a ValueCircle Style.
double minValue = double.MaxValue;
double maxValue = double.MinValue;
featureSource.Open();
for (int i = 0; i < featureSource.GetCount(); i++)
{
Feature feature = featureSource.GetFeatureById((i + 1).ToString(CultureInfo.InvariantCulture), SelectedColumns);
double columnValue;
if (double.TryParse(feature.ColumnValues[SelectedColumns[0]], out columnValue))
{
if (columnValue < minValue)
{
minValue = columnValue;
}
else if (columnValue > maxValue)
{
maxValue = columnValue;
}
}
}
featureSource.Close();
ValueCircleStyle valueCircleStyle = new ValueCircleStyle();
valueCircleStyle.ColumnName = SelectedColumns[0];
valueCircleStyle.DrawingRadiusRatio = radiusRatio;
valueCircleStyle.MinValidValue = minValue;
valueCircleStyle.MaxValidValue = maxValue;
valueCircleStyle.MinCircleAreaInDefaultZoomLevel = 80;
valueCircleStyle.MaxCircleAreaInDefaultZoomLevel = 10000;
valueCircleStyle.InnerColor = GeoColor.FromArgb(this.Opacity, Color);
valueCircleStyle.OuterColor = GeoColor.SimpleColors.White;
return new Collection<Style>(){valueCircleStyle};
}
protected override void DrawCore(GeoCanvas geoCanvas, Style style)
{
Bitmap bitmap = new Bitmap(50, 50);
RectangleShape worldExtent = new RectangleShape(-180, 90, 180, -90);
ValueCircleStyle valueCircleStyle = style as ValueCircleStyle;
double radius = Math.Sqrt(circleArea / Math.PI);
// Draw Icon
geoCanvas.BeginDrawing(bitmap, worldExtent, GeographyUnit.DecimalDegree);
if (valueCircleStyle != null)
{
geoCanvas.DrawEllipse(new PointShape(0, 0), (float)(radius * 2), (float)(radius * 2), new GeoPen(new GeoSolidBrush(valueCircleStyle.OuterColor)), new GeoSolidBrush(valueCircleStyle.InnerColor), DrawingLevel.LevelOne);
}
geoCanvas.DrawArea(worldExtent, new GeoPen(GeoColor.FromHtml("#cccccc"), 2), DrawingLevel.LabelLevel);
geoCanvas.EndDrawing();
//Calculate the value of radius
double drawingRadius = circleArea / valueCircleStyle.DrawingRadiusRatio * valueCircleStyle.BasedScale / valueCircleStyle.DefaultZoomLevel.Scale;
double dCircleArea = valueCircleStyle.MaxCircleAreaInDefaultZoomLevel - valueCircleStyle.MinCircleAreaInDefaultZoomLevel;
double dValue = valueCircleStyle.MaxValidValue - valueCircleStyle.MinValidValue;
double ratio = dValue / dCircleArea;
double resultValue = (drawingRadius - valueCircleStyle.MinCircleAreaInDefaultZoomLevel) * ratio + valueCircleStyle.MinValidValue;
if (resultValue > 0)
{
Image = bitmap;
Title = MapSuiteSampleHelper.GetFormatedStringForLegendItem(valueCircleStyle.ColumnName, resultValue);
}
else
{
Image = null;
Title = null;
}
}
