Xamarin使用Skia Sharp形成虚线

Question

我们如何使用Skia Sharp创建一个以Xamarin形式创建一个虚线的圆圈，我尝试了很多，但是我无法实现它可以帮助我。

        SKImageInfo info = args.Info;
        SKSurface surface = args.Surface;
        SKCanvas canvas = surface.Canvas;
        canvas.Clear();
        SKPaint paint = new SKPaint
        {
            Style = SKPaintStyle.Stroke,
            Color = Color.Red.ToSKColor(),
            StrokeWidth = 10
        };
        canvas.DrawCircle(info.Width / 3, info.Height / 2, 100, paint);

Answer 1

您非常接近。您只需要了解自己在做什么。您是否正确设置页面的构造函数？你必须

1. 创建一个SkCanvasView的实例，然后将其添加到页面内容中。
2. 因此，假设您的班级或页面的名称是SimpleCirclePage.cs，您需要将其与其他项目一起添加。
3. 将事件处理程序添加到您的skcanvasview实例的油漆脸部事件中。

构造函数

public SimpleCirclePage()
{
        SKCanvasView canvasView = new SKCanvasView();
        canvasView.PaintSurface += OnCanvasViewPaintSurface;
        Content = canvasView;
}

活动处理程序

void OnCanvasViewPaintSurface(object sender, SKPaintSurfaceEventArgs args)
{
        SKImageInfo info = args.Info;
        SKSurface surface = args.Surface;
        SKCanvas canvas = surface.Canvas;
        canvas.Clear();
        // Creating the Outline of the circle with Black
        SKPaint paint = new SKPaint
        {
                Style = SKPaintStyle.Stroke,
                Color = Color.Black.ToSKColor(),
                StrokeWidth = 22
        };
        canvas.DrawCircle(info.Width / 2, info.Height / 2, 100, paint);
        // Filling the circle with red
        paint.Style = SKPaintStyle.Fill;
        paint.Color = SKColors.Red;
        canvas.DrawCircle(info.Width / 2, info.Height / 2, 100, paint);
}