private void Activate(Point2D firstPoint)
{
if (Map == null || Map.Layers == null)
{
return;
}
DrawLayer = new ElementsLayer();
Map.Layers.Add(DrawLayer);
_startPoint = firstPoint;
_polygon = new PolygonElement();
#region 所有风格的控制
_polygon.Stroke = this.Stroke;
_polygon.StrokeThickness = this.StrokeThickness;
_polygon.StrokeMiterLimit = this.StrokeMiterLimit;
_polygon.StrokeDashOffset = this.StrokeDashOffset;
_polygon.StrokeDashArray = this.StrokeDashArray;
_polygon.StrokeDashCap = this.StrokeDashCap;
_polygon.StrokeEndLineCap = this.StrokeEndLineCap;
_polygon.StrokeLineJoin = this.StrokeLineJoin;
_polygon.StrokeStartLineCap = this.StrokeStartLineCap;
_polygon.Opacity = this.Opacity;
_polygon.Fill = this.Fill;
_polygon.FillRule = this.FillRule;
#endregion
_points = new Point2DCollection();
_polygon.Point2Ds = _points;
_points.Add(firstPoint);
_pointsCount++;
_points.Add(firstPoint.Clone());
_pointsCount++;
DrawLayer.Children.Add(_polygon);
_isActivated = true;
}