private void OnPaintSurface(SKCanvas canvas, SKRect rect, bool isDrawResult, float transX = 0, float transY = 0, float scale = 1)
{
if (config.BackgroundType == BackgroundType.Color)
{
canvas.Clear(config.BackgroundColor);
}
else if (config.BackgroundType == BackgroundType.StretchedImage && backgroundBitmap != null)
{
canvas.Clear();
canvas.DrawBackground(backgroundBitmap, rect, config);
}
else
{
canvas.Clear();
}
if (backgroundBitmap != null)
{
canvas.Save();
}
canvas.SetMatrix(new SKMatrix(scale, 0, transX * scale, 0, scale, transY * scale, 0, 0, 1));
canvas.DrawBitmap(mainBitmap, transX, transY, scale);
canvas.DrawPath(completedPaths, isDrawResult ? null : inProgressPaths);
canvas.Restore();
canvas.DrawBitmap(bitmapCollection, transX, transY, scale);
}