public static PColor ToUIColor(this string hexColor)
{
if (string.IsNullOrWhiteSpace(hexColor))
{
throw new ArgumentException("Invalid color string.", nameof(hexColor));
}
if (!hexColor.StartsWith("#", StringComparison.Ordinal))
{
hexColor = hexColor.Insert(0, "#");
}
PColor color = PColor.Clear;
switch (hexColor.Length)
{
case 9:
{
var cuint = Convert.ToUInt32(hexColor.Substring(1), 16);
var a = (byte)(cuint >> 24);
var r = (byte)((cuint >> 16) & 0xff);
var g = (byte)((cuint >> 8) & 0xff);
var b = (byte)(cuint & 0xff);
#if __MACOS__
color = PColor.FromRgba(r, g, b, a);
#elif __IOS__
color = PColor.FromRGBA(r, g, b, a);
#endif
break;
}
case 7:
{
var cuint = Convert.ToUInt32(hexColor.Substring(1), 16);
var r = (byte)((cuint >> 16) & 0xff);
var g = (byte)((cuint >> 8) & 0xff);
var b = (byte)(cuint & 0xff);
#if __MACOS__
color = PColor.FromRgba(r, g, b, (byte)255);
#elif __IOS__
color = PColor.FromRGBA(r, g, b, (byte)255);
#endif
break;
}
case 5:
{
var cuint = Convert.ToUInt16(hexColor.Substring(1), 16);
var a = (byte)(cuint >> 12);
var r = (byte)((cuint >> 8) & 0xf);
var g = (byte)((cuint >> 4) & 0xf);
var b = (byte)(cuint & 0xf);
a = (byte)(a << 4 | a);
r = (byte)(r << 4 | r);
g = (byte)(g << 4 | g);
b = (byte)(b << 4 | b);
#if __MACOS__
color = PColor.FromRgba(r, g, b, a);
#elif __IOS__
color = PColor.FromRGBA(r, g, b, a);
#endif
break;
}
case 4:
{
var cuint = Convert.ToUInt16(hexColor.Substring(1), 16);
var r = (byte)((cuint >> 8) & 0xf);
var g = (byte)((cuint >> 4) & 0xf);
var b = (byte)(cuint & 0xf);
r = (byte)(r << 4 | r);
g = (byte)(g << 4 | g);
b = (byte)(b << 4 | b);
#if __MACOS__
color = PColor.FromRgba(r, g, b, (byte)255);
#elif __IOS__
color = PColor.FromRGBA(r, g, b, (byte)255);
#endif
break;
}
default:
throw new FormatException(string.Format("The {0} string passed in the c argument is not a recognized Color format.", hexColor));
}
return(color);
}
public override UIImage ToNativeImage(CGSize targetSize, UIColor color = default(UIColor), Thickness margin = default(Thickness))
{
if (bezierPath == null)
{
return(null);
}
CGSize imageSize = bezierPath.Bounds.Size;
if ((int)imageSize.Width <= 0 && (int)imageSize.Height <= 0)
{
return(null);
}
if (nfloat.IsNaN(targetSize.Width) && nfloat.IsNaN(targetSize.Height))
{
targetSize = new CGSize(0.85f * imageSize.Width, 0.85f * imageSize.Height);
}
else if (nfloat.IsNaN(targetSize.Width))
{
targetSize.Width = (imageSize.Width / imageSize.Height) * targetSize.Height;
}
else if (nfloat.IsNaN(targetSize.Height))
{
targetSize.Height = (imageSize.Height / imageSize.Width) * targetSize.Width;
}
if ((int)targetSize.Width <= 0 && (int)targetSize.Height <= 0)
{
return(null);
}
nfloat scale = 1f;
var translate = CGPoint.Empty;
if (!imageSize.Equals(targetSize))
{
var scaleX = targetSize.Width / imageSize.Width;
var scaleY = targetSize.Height / imageSize.Height;
scale = (nfloat)Math.Min(targetSize.Width / imageSize.Width, targetSize.Height / imageSize.Height);
if (scaleX > scaleY)
{
translate.X = (targetSize.Width - (imageSize.Width * scale)) * 0.5f;
}
else if (scaleX < scaleY)
{
translate.Y = (targetSize.Height - (imageSize.Height * scale)) * 0.5f;
}
}
UIImage image;
#if __IOS__
UIGraphics.BeginImageContextWithOptions(targetSize, false, 0);
using (var context = UIGraphics.GetCurrentContext()) {
context.TranslateCTM(translate.X, translate.Y);
context.ScaleCTM(scale, scale);
context.InterpolationQuality = CGInterpolationQuality.High;
context.SetFillColor((color ?? UIColor.Black).CGColor);
bezierPath.UsesEvenOddFillRule = (FillRule == FillRule.EvenOdd);
bezierPath.Fill();
image = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
}
#elif __MACOS__
// macOS TODO
image = null;
#endif
return(image);
}
/// <remarks>
/// This method is required for performance. Creating a native Color
/// requires a round-trip with Objective-C, so updating this value only when opacity
/// and color changes is more efficient.
/// </remarks>
partial void UpdateColorWithOpacity(Color newColor, double opacity)
{
newColor.A = (byte)(newColor.A * opacity);
ColorWithOpacity = newColor;
}
