/// <summary>
/// Render the StrokeCollection under the specified DrawingContext. This draw method uses the
/// passing in drawing attribute to override that on the stroke.
/// </summary>
/// <param name="drawingContext"></param>
/// <param name="drawingAttributes"></param>
public void Draw(DrawingContext drawingContext, DrawingAttributes drawingAttributes)
{
if (null == drawingContext)
{
throw new System.ArgumentNullException("context");
}
if (null == drawingAttributes)
{
throw new System.ArgumentNullException("drawingAttributes");
}
// context.VerifyAccess();
//our code never calls this public API so we can assume that opacity
//has not been set up
if (drawingAttributes.IsHighlighter)
{
drawingContext.PushOpacity(StrokeRenderer.HighlighterOpacity);
try
{
this.DrawInternal(drawingContext, StrokeRenderer.GetHighlighterAttributes(this, this.DrawingAttributes), false);
}
finally
{
drawingContext.Pop();
}
}
else
{
this.DrawInternal(drawingContext, drawingAttributes, false);
}
}
/// <summary>
/// Updates the contents of the visual.
/// </summary>
internal void Update()
{
using (DrawingContext drawingContext = RenderOpen())
{
bool highContrast = _renderer.IsHighContrast();
if (highContrast == true && _stroke.DrawingAttributes.IsHighlighter)
{
// we don't render highlighters in high contrast
return;
}
DrawingAttributes da;
if (highContrast)
{
da = _stroke.DrawingAttributes.Clone();
da.Color = _renderer.GetHighContrastColor();
}
else if (_stroke.DrawingAttributes.IsHighlighter == true)
{
// Get the drawing attributes to use for a highlighter stroke. This can be a copied DA with color.A
// overridden if color.A != 255.
da = StrokeRenderer.GetHighlighterAttributes(_stroke, _stroke.DrawingAttributes);
}
else
{
// Otherwise, usethe DA on this stroke
da = _stroke.DrawingAttributes;
}
// Draw selected stroke as hollow
_stroke.DrawInternal(drawingContext, da, _stroke.IsSelected);
}
}
/// <summary>
/// Render the StrokeCollection under the specified DrawingContext.
/// </summary>
/// <param name="context"></param>
public void Draw(DrawingContext context)
{
if (null == context)
{
throw new System.ArgumentNullException("context");
}
//The verification of UI context affinity is done in Stroke.Draw()
List <Stroke> solidStrokes = new List <Stroke>();
Dictionary <Color, List <Stroke> > highLighters = new Dictionary <Color, List <Stroke> >();
for (int i = 0; i < this.Count; i++)
{
Stroke stroke = this[i];
List <Stroke> strokes;
if (stroke.DrawingAttributes.IsHighlighter)
{
// It's very important to override the Alpha value so that Colors of the same RGB vale
// but different Alpha would be in the same list.
Color color = StrokeRenderer.GetHighlighterColor(stroke.DrawingAttributes.Color);
if (highLighters.TryGetValue(color, out strokes) == false)
{
strokes = new List <Stroke>();
highLighters.Add(color, strokes);
}
strokes.Add(stroke);
}
else
{
solidStrokes.Add(stroke);
}
}
foreach (List <Stroke> strokes in highLighters.Values)
{
context.PushOpacity(StrokeRenderer.HighlighterOpacity);
try
{
foreach (Stroke stroke in strokes)
{
stroke.DrawInternal(context, StrokeRenderer.GetHighlighterAttributes(stroke, stroke.DrawingAttributes),
false /*Don't draw selected stroke as hollow*/);
}
}
finally
{
context.Pop();
}
}
foreach (Stroke stroke in solidStrokes)
{
stroke.DrawInternal(context, stroke.DrawingAttributes, false /*Don't draw selected stroke as hollow*/);
}
}