Skiasharp 文本渲染关闭 canvas

Question

我正在使用 skiasharp 和 xamarin 表单创建自定义控件。我运行感兴趣的是，当我尝试在 canvas 的左上角绘制文本时，我必须偏移 y 坐标才能使文本在 canvas 中呈现.我希望文本的 x y 坐标与矩形的 x y 坐标处于相同的位置。我错过了什么？

使用 Skiasharp.View.Forms - v1.68.1 关闭 nuget

谢谢！

protected override void OnPaintSurface(SKPaintSurfaceEventArgs args)
{
  base.OnPaintSurface(args);

  SKImageInfo info = args.Info;
  SKSurface surface = args.Surface;
  SKCanvas canvas = surface.Canvas;

  canvas.Clear();
  canvas.Save();

  using var paint = new SKPaint {IsAntialias = true, Color = Color.Black.ToSKColor(), Style = SKPaintStyle.Stroke};

  canvas.DrawRect(0, 0, info.Width, info.Height, paint);

  canvas.DrawText("Off screen", 0, 0, paint);
  canvas.DrawText("On screen", 0, 10, paint);

  canvas.Restore();
}

Answer 1

您可以将y坐标设置为SKPaint.FontSpacing，这是推荐的行间距。

 canvas.DrawText("SKCanvasView Height and Width:", 0, paint.FontSpacing, paint);

参考https://github.com/xamarin/xamarin-forms-samples/blob/f7cc661331b5db605e64e7efe83ef2b9fc644afb/SkiaSharpForms/Demos/Demos/SkiaSharpFormsDemos/Basics/SurfaceSizePage.cs#L38

Skiasharp 文本渲染关闭 canvas

Skiasharp text rendering off canvas

xamarin

skiasharp