public override void Awake(NSObject context)
{
base.Awake(context);
var scale = WKInterfaceDevice.CurrentDevice.ScreenScale;
var bitmap = new SKBitmap((int)(ContentFrame.Width * scale), (int)(ContentFrame.Height * scale));
var colors = new[] { SKColors.Cyan, SKColors.Magenta, SKColors.Yellow, SKColors.Cyan };
var center = new SKPoint(bitmap.Width / 2, bitmap.Height / 2);
using (var canvas = new SKCanvas(bitmap))
{
canvas.Clear(SKColors.Transparent);
using (var path = new SKPath())
{
path.AddRoundedRect(new SKRect(5, 5, bitmap.Width - 5, bitmap.Height - 5), 5, 5);
canvas.ClipPath(path);
}
using (var paint = new SKPaint())
using (var gradient = SKShader.CreateSweepGradient(center, colors, null))
{
paint.IsAntialias = true;
paint.Shader = gradient;
canvas.DrawPaint(paint);
paint.Shader = null;
}
using (var paint = new SKPaint())
using (var tf = SKTypeface.FromFamilyName("San Fransisco"))
{
paint.IsAntialias = true;
paint.Color = SKColors.DarkBlue;
paint.TextSize = (float)(20 * scale);
paint.TextAlign = SKTextAlign.Center;
paint.Typeface = tf;
canvas.DrawText("SkiaSharp", center.X, (center.Y / 2) + (paint.TextSize / 2), paint);
}
}
var image = bitmap.ToUIImage(scale, UIKit.UIImageOrientation.Up);
imageView.SetImage(image);
}
/// <summary>
/// Generates a blended image with a CAM and the desired overlay color
/// </summary>
/// <returns>The blended CAMI mage.</returns>
/// <param name="index">Index.</param>
/// <param name="color">Color.</param>
private async Task <UIImage> GenerateBlendedCAMImage(CAM cam, SKColor color)
{
// Cancel the previous blending task if there is one
cancellationTokenSource?.Cancel();
cancellationTokenSource = new CancellationTokenSource();
// Dispose of previous blended image
blendedImage?.Dispose();
SKBitmap colorMap = await ImageProcessorRunner.GetCAMColorMapTask(
cam,
color,
(int)(InputImage.Size.Width *InputImage.CurrentScale),
(int)(InputImage.Size.Height *InputImage.CurrentScale),
cancellationTokenSource.Token
);
SKBitmap input = InputImage.ToSKBitmap();
SKBitmap blendedSKBitmap = await ImageProcessorRunner.GetOverlayImageTask(
input,
colorMap,
cancellationTokenSource.Token
);
// Dispose of temporary SKBitmap
input.Dispose();
UIImage blendedUIImage = blendedSKBitmap.ToUIImage();
// Cleanup the intermediate bitmaps
colorMap?.Dispose();
blendedSKBitmap?.Dispose();
return(blendedUIImage);
}
