/// <summary>
/// Draw an ink stroke
/// </summary>
/// <param name="canvas">the canvas</param>
/// <param name="stroke">the stroke</param>
/// <param name="useCache">true to use cached data</param>
public static void Draw(this SKCanvas canvas, XInkStroke stroke, bool useCache)
{
_ = canvas ?? throw new ArgumentNullException(nameof(canvas));
_ = stroke ?? throw new ArgumentNullException(nameof(stroke));
var inkPoints = stroke.GetInkPoints();
if (useCache)
{
if (inkPoints.Count == 1)
{
if (stroke.Paint == null)
{
var paintResult = stroke.CreatePaint(SKPaintStyle.Fill);
stroke.Paint = paintResult.Item1;
stroke.Resources = paintResult.Item2;
}
canvas.DrawCircle(
stroke.GetInkPoints()[0].Position.ToSKPoint(),
stroke.DrawingAttributes.Size / 4.0f,
stroke.Paint);
}
else
{
stroke.Path ??= stroke.DrawingAttributes.IgnorePressure
? stroke.CreatePath()
: stroke.CreateVariableThicknessPath();
if (stroke.Paint == null)
{
var paintResult = stroke.CreatePaint();
stroke.Resources = paintResult.Item2;
stroke.Paint = paintResult.Item1;
}
if (stroke.Path != null)
{
canvas.DrawPath(stroke.Path, stroke.Paint);
}
}
}
else
{
if (inkPoints.Count == 1)
{
var paintResult = stroke.CreatePaint(SKPaintStyle.Fill);
using (var paint = paintResult.Item1)
{
paint.IsStroke = false;
var radius = stroke.DrawingAttributes.Size / 4.0f;
//System.Diagnostics.Debug.WriteLine($"Drawing dot radius {radius}");
canvas.DrawCircle(
inkPoints[0].Position.ToSKPoint(),
radius,
paint);
}
if (paintResult.Item2 != null)
{
foreach (var item in paintResult.Item2)
{
item.Dispose();
}
}
}
else
{
using var path = stroke.DrawingAttributes.IgnorePressure ? stroke.CreatePath() : stroke.CreateVariableThicknessPath();
if (path == null)
{
return;
}
var paintResult = stroke.CreatePaint();
using (var paint = paintResult.Item1)
{
canvas.DrawPath(path, paint);
}
if (paintResult.Item2 != null)
{
foreach (var item in paintResult.Item2)
{
item.Dispose();
}
}
}
}
}