private void OnCanvasViewPaintSurface(object sender, SKPaintSurfaceEventArgs args)
{
SKImageInfo info = args.Info;
SKSurface surface = args.Surface;
SKCanvas canvas = surface.Canvas;
var skiaDrawingSurface = new SkiaDrawingSurface(surface.Canvas);
int requiredHeight = chordDiagramRenderer.GetRequiredHeight(skiaDrawingSurface);
if (this.SkiaCanvas.Height < requiredHeight)
{
// this.CanvasView.HeightRequest = requiredHeight;
}
// work out the width we need for our diagram
var diagramRequiredWidth = chordDiagramRenderer.GetRequiredWidthPerChord();
var canvasWidth = info.Width;
var chordsPerRow = canvasWidth / diagramRequiredWidth;
if (chordsPerRow > 10)
{
chordsPerRow = 10;
}
chordDiagramRenderer.ChordsPerRow = (int)chordsPerRow - 1;
float scaleFactor = (float)canvasWidth / (float)(diagramRequiredWidth * chordsPerRow);
if (scaleFactor < 1.5)
{
scaleFactor = 1.5f;
}
skiaDrawingSurface.SetScale((float)scaleFactor);
canvas.Clear();
chordDiagramRenderer.Render(skiaDrawingSurface);
}
public override void Render(DrawingContext context)
{
base.Render(context);
if (ChordDefinition != null)
{
_diagramRenderer.CurrentChordDiagrams = ViewModels.MainViewModel.GuitarModel.GetChordDiagramsByGroup(ChordDefinition.ChordGroup.ToString());
}
context.Custom(_customDrawingOp);
//Dispatcher.UIThread.InvokeAsync(InvalidateVisual, DispatcherPriority.Background);
var diagramWidth = _diagramRenderer.GetRequiredWidthPerChord() * _diagramRenderer.ChordsPerRow;
if (this.Width != diagramWidth)
{
this.Width = diagramWidth;
}
if (this.Height != 500)
{
this.Height = 500;
}
}