/// <inheritdoc/>
public void DrawLineSegments(
IList <ScreenPoint> points,
OxyColor stroke,
double thickness,
EdgeRenderingMode edgeRenderingMode,
double[] dashArray = null,
LineJoin lineJoin = LineJoin.Miter)
{
if (points.Count < 2 || !stroke.IsVisible() || thickness <= 0)
{
return;
}
var paint = this.GetLinePaint(stroke, thickness, edgeRenderingMode, dashArray, lineJoin);
var skPoints = new SKPoint[points.Count];
switch (edgeRenderingMode)
{
case EdgeRenderingMode.Automatic when this.RendersToPixels:
case EdgeRenderingMode.Adaptive when this.RendersToPixels:
case EdgeRenderingMode.PreferSharpness when this.RendersToPixels:
var snapOffset = this.GetSnapOffset(thickness, edgeRenderingMode);
for (var i = 0; i < points.Count - 1; i += 2)
{
var p1 = points[i];
var p2 = points[i + 1];
if (RenderContextBase.IsStraightLine(p1, p2))
{
skPoints[i] = this.ConvertSnap(p1, snapOffset);
skPoints[i + 1] = this.ConvertSnap(p2, snapOffset);
}
else
{
skPoints[i] = this.Convert(p1);
skPoints[i + 1] = this.Convert(p2);
}
}
break;
default:
for (var i = 0; i < points.Count; i += 2)
{
skPoints[i] = this.Convert(points[i]);
skPoints[i + 1] = this.Convert(points[i + 1]);
}
break;
}
this.SkCanvas.DrawPoints(SKPointMode.Lines, skPoints, paint);
}
/// <summary>
/// Gets the <see cref="SKPoint"/>s that should actually be rendered from the list of <see cref="ScreenPoint"/>s, taking into account DPI scaling and snapping if necessary.
/// </summary>
/// <param name="screenPoints">The points.</param>
/// <param name="strokeThickness">The stroke thickness.</param>
/// <param name="edgeRenderingMode">The edge rendering mode.</param>
/// <returns>The actual points.</returns>
private IEnumerable <SKPoint> GetActualPoints(IList <ScreenPoint> screenPoints, double strokeThickness, EdgeRenderingMode edgeRenderingMode)
{
switch (edgeRenderingMode)
{
case EdgeRenderingMode.Automatic when this.RendersToPixels && RenderContextBase.IsStraightLine(screenPoints):
case EdgeRenderingMode.Adaptive when this.RendersToPixels && RenderContextBase.IsStraightLine(screenPoints):
case EdgeRenderingMode.PreferSharpness when this.RendersToPixels:
var snapOffset = this.GetSnapOffset(strokeThickness, edgeRenderingMode);
return(screenPoints.Select(p => this.ConvertSnap(p, snapOffset)));
default:
return(screenPoints.Select(this.Convert));
}
}
