protected override void OnDraw(Android.Graphics.Canvas canvas)
{
var linearGradient = new Styles.Color.LinearGradient(
new Styles.IRgb[] { ColorSwatches.FlatMint, ColorSwatches.FlatBlue },
45
);
var radialGradient = new Styles.Color.RadialGradient(
new Styles.IRgb[] { ColorSwatches.FlatMint, ColorSwatches.FlatBlue },
.5f, .5f
);
var ellipticalGradient = new Styles.Color.EllipticalGradient(
new Styles.IRgb[] { ColorSwatches.FlatMint, ColorSwatches.FlatBlue, ColorSwatches.DeepPurple },
.5f, .5f
);
ellipticalGradient.SetScale(1f, 2f);
ellipticalGradient.Rotation = 45;
var bounds = canvas.ClipBounds;
var shader = ellipticalGradient.Draw(new RectF(bounds.Left, bounds.Top, bounds.Right, bounds.Bottom));
var paint = new Paint();
paint.SetShader(shader);
canvas.DrawPaint(paint);
}
public static GradientView ToNativeView(this EllipticalGradient target, CGRect frame)
{
return(new GradientView(target)
{
Frame = frame
});
}
public static void Draw(this EllipticalGradient target, CGContext ctx, CGRect bounds)
{
target.Update();
CGRect clippingBounds = bounds;
if (!target.Frame.IsEmpty)
{
bounds = new CGRect(target.Frame.X, target.Frame.Y, target.Frame.Width, target.Frame.Height);
}
var gradColors = GenerateGradientColors(target.Colors);
var colorSpace = CGColorSpace.CreateDeviceRGB();
var grad = new CGGradient(colorSpace, gradColors, ConvertToNativeArray(target.Locations));
var gradCenter = new CGPoint((bounds.Width * target.Center.X), (bounds.Height * target.Center.Y));
var gradRadius = (nfloat)Math.Min(bounds.Size.Width / 2, bounds.Size.Height / 2);
var drawingFlags = GetGradientFlags(target);
var scaleT = CGAffineTransform.MakeScale(target.Scale.X, target.Scale.Y);
ctx.SaveState();
if (!target.Frame.IsEmpty)
{
ctx.ClipToRect(new CGRect(bounds.X + clippingBounds.X, bounds.Y + clippingBounds.Y, clippingBounds.Width, clippingBounds.Height));
}
ctx.TranslateCTM(bounds.X + gradCenter.X, bounds.Y + gradCenter.Y);
ctx.RotateCTM((nfloat)(target.Rotation * (Math.PI / 180)));
ctx.ScaleCTM(scaleT.xx, scaleT.yy);
ctx.DrawRadialGradient(grad, CGPoint.Empty, 0, CGPoint.Empty, gradRadius, drawingFlags);
ctx.RestoreState();
grad.Dispose();
colorSpace.Dispose();
}
public static CALayer ToNativeLayer(this EllipticalGradient target, CGRect frame)
{
return(new GradientLayer(target)
{
Frame = frame
});
}
public static Shader Draw(this EllipticalGradient target, RectF bounds)
{
target.Update();
var center = new PointF((bounds.Width() * target.Center.X), (bounds.Height() * target.Center.Y));
var radius = (float)Math.Min(bounds.Width() / 2f, bounds.Height() / 2f);
var grad = new Android.Graphics.RadialGradient(
center.X, center.Y, radius,
target.Colors.ToInt(),
target.Locations,
Shader.TileMode.Clamp
);
Matrix matrix = new Matrix();
matrix.SetScale(target.Scale.X, target.Scale.Y, center.X, center.Y);
matrix.PostRotate((float)target.Rotation, center.X, center.Y);
grad.SetLocalMatrix(matrix);
return(grad);
}
public GradientLayer(EllipticalGradient gradient)
{
this.ellipticalGradient = gradient;
Type = GradientType.Ellipse;
Initalize();
}
public GradientView(EllipticalGradient gradient)
{
this.ellipticalGradient = gradient;
Type = GradientType.Ellipse;
BackgroundColor = UIColor.Clear;
}
