DataUriStyleRenderer.cs

using Mapsui;
using Mapsui.Extensions;
using Mapsui.Layers;
// Attempt to use Skia renderer interfaces; if unavailable, fall back to stub.
#if MAPSUI_SKIA
using Mapsui.Rendering.Skia; // Provides ISkiaStyleRenderer & IRenderCache in Mapsui Skia packages
#endif
using Mapsui.Rendering.Skia.SkiaStyles;
using Mapsui.Styles;
using SkiaSharp;
 
namespace NeuroAccessMaui.UI.Controls.Geo
{
#if MAPSUI_SKIA
    public class DataUriStyleRenderer : ISkiaStyleRenderer
    {
        public bool Draw(
            SKCanvas Canvas,
            Viewport Viewport,
            ILayer Layer,
            IFeature Feature,
            IStyle Style,
            IRenderCache RenderCache,
            long Iteration)
        {
            if (Style is not DataUriStyle CustomStyle)
                return false;
 
            // Extract a single coordinate (assumes point geometry)
            double WorldX = 0;
            double WorldY = 0;
            bool GotPoint = false;
 
            Feature.CoordinateVisitor((X, Y, Setter) =>
            {
                WorldX = X;
                WorldY = Y;
                GotPoint = true;
            });
 
            if (!GotPoint)
                return false;
 
            MPoint WorldPoint = new MPoint(WorldX, WorldY);
            MPoint Screen = Viewport.WorldToScreen(WorldPoint);
 
            string DataUri = Feature["DataUri"]?.ToString() ?? string.Empty;
 
            // Placeholder: Render a circle. Replace with logic parsing DataUri into an icon.
            using SKPaint Paint = new SKPaint
            {
                Color = SKColors.Blue.WithAlpha((byte)(255 * CustomStyle.Opacity)),
                IsAntialias = true
            };
            Canvas.DrawCircle((float)Screen.X, (float)Screen.Y, 12, Paint);
 
            return true;
        }
    }
#else
    public class DataUriStyleRenderer
    {
        public bool Draw() => false;
    }
#endif
}