public byte[] Render(VisualElement formsView)
{
UIView view = ConvertToNative(formsView);
if (view == null)
{
return(new byte[0]);
}
var renderer = new UIGraphicsImageRenderer(view.Bounds.Size);
UIImage image = renderer.CreateImage((rendererContext) => {
view.Layer.RenderInContext(rendererContext.CGContext);
});
if (image == null)
{
return(new byte[0]);
}
NSData imageData = image.AsPNG();
if (imageData == null)
{
return(new byte[0]);
}
return(imageData.ToArray());
}
partial void AddAsset(NSObject sender)
{
var rnd = new Random();
// Create a random dummy image.
var size = (rnd.Next(0, 2) == 0)
? new CGSize(400f, 300f)
: new CGSize(300f, 400f);
var renderer = new UIGraphicsImageRenderer(size);
var image = renderer.CreateImage(context => {
UIColor.FromHSBA((float)rnd.NextDouble(), 1, 1, 1).SetFill();
context.FillRect(context.Format.Bounds);
});
// Add it to the photo library
PHPhotoLibrary.SharedPhotoLibrary.PerformChanges(() => {
PHAssetChangeRequest creationRequest = PHAssetChangeRequest.FromImage(image);
if (AssetCollection != null)
{
var addAssetRequest = PHAssetCollectionChangeRequest.ChangeRequest(AssetCollection);
addAssetRequest.AddAssets(new PHObject [] {
creationRequest.PlaceholderForCreatedAsset
});
}
}, (success, error) => {
if (!success)
{
Console.WriteLine(error.LocalizedDescription);
}
});
}
public UIImage RenderParts()
{
// Determine which parts to draw.
IceCreamPart[] allParts = { Topping, Scoops, Base };
var partImages = allParts.Where(p => p != null && p.Image != null).Select(p => p.StickerImage);
// Calculate the size of the composited ice cream parts image.
var outputImageSize = CGSize.Empty;
outputImageSize.Width = partImages.OrderByDescending(i => i.Size.Width).FirstOrDefault().Size.Width;
outputImageSize.Height = (nfloat)partImages.Sum(i => i.Size.Height);
// Render the part images into a single composite image.
var renderer = new UIGraphicsImageRenderer(outputImageSize);
var image = renderer.CreateImage(context => {
// Draw each of the body parts in a vertica stack.
nfloat nextYPosition = 0f;
foreach (var partImage in partImages)
{
var position = new CGPoint(outputImageSize.Width / 2f - partImage.Size.Width / 2f, nextYPosition);
partImage.Draw(position);
nextYPosition += partImage.Size.Height;
}
});
return(image);
}
UIImage CreateImage(CGSize size, UIColor [] colors)
{
// Perform some time-consuming drawing, using some colors of our choice.
// This example just draws a lot of random circles.
var renderer = new UIGraphicsImageRenderer(size);
return(renderer.CreateImage(context => {
var random = new Random(DateTime.Now.Millisecond);
for (int i = 0; i <= 25000; i++)
{
var colorIndex = random.Next(0, colors.Length);
var color = colors [colorIndex];
color.SetFill();
var rectX = random.NextDouble() * size.Width;
var rectY = random.NextDouble() * size.Height;
var s = random.NextDouble() * 80;
var rect = new CGRect(rectX, rectY, s, s);
var path = UIBezierPath.FromOval(rect);
path.Fill();
}
}));
}
public void GenView(MKClusterAnnotation cluster)
{
AnnotationViewSize annotationSize = MapSettings.AnnotationSize;
if (cluster != null)
{
var renderer = new UIGraphicsImageRenderer(new CGSize(annotationSize.Width,
annotationSize.Height));
var count = cluster.MemberAnnotations.Length;
Image = renderer.CreateImage((context) => {
//circle
UIColor.FromRGB(230, 141, 119).SetFill();
UIBezierPath.FromOval(new CGRect(0,
0,
annotationSize.Width,
annotationSize.Height)).Fill();
//text
var attributes = new UIStringAttributes()
{
ForegroundColor = UIColor.Black,
Font = UIFont.BoldSystemFontOfSize(20)
};
var text = new NSString($"{count}");
var size = text.GetSizeUsingAttributes(attributes);
var rect = new CGRect(20 - size.Width / 2, 20 - size.Height / 2, size.Width, size.Height);
text.DrawString(rect, attributes);
});
}
}
public static UIImage?ConvertToImage(this UIView view)
{
var imageRenderer = new UIGraphicsImageRenderer(view.Bounds.Size);
return(imageRenderer.CreateImage((a) =>
{
view.Layer.RenderInContext(a.CGContext);
}));
}
/// <summary>
/// resizes an UIImage to 1% of size
/// </summary>
/// <param name="image">original image</param>
/// <returns>resized image</returns>
public static UIImage Resize(UIImage image)
{
CGSize canvas = new CGSize(
width: image.Size.Width * 0.1,
height: image.Size.Height * 0.1
);
UIGraphicsImageRendererFormat format = new UIGraphicsImageRendererFormat();
UIGraphicsImageRenderer rendered = new UIGraphicsImageRenderer(size: canvas);
var ret_image = rendered.CreateImage(actions: null);
return(ret_image);
}
public UIImage RenderSticker(bool opaque)
{
var partsImage = RenderParts();
if (partsImage == null)
{
return(null);
}
// Determine the size to draw as a sticker.
CGSize outputSize = CGSize.Empty;
CGSize iceCreamSize = CGSize.Empty;
if (opaque)
{
// Scale the ice cream image to fit in the center of the sticker.
var scale = NMath.Min((size.Width - opaquePadding.Width) / partsImage.Size.Height, (size.Height - opaquePadding.Height) / partsImage.Size.Width);
iceCreamSize = new CGSize(partsImage.Size.Width * scale, partsImage.Size.Height * scale);
outputSize = size;
}
else
{
// Scale the ice cream to fit it's height into the sticker.
var scale = size.Width / partsImage.Size.Height;
iceCreamSize = new CGSize(partsImage.Size.Width * scale, partsImage.Size.Height * scale);
outputSize = iceCreamSize;
}
// Scale the ice cream image to the correct size.
var renderer = new UIGraphicsImageRenderer(outputSize);
var image = renderer.CreateImage((context) => {
UIColor backgroundColor = opaque ? UIColor.FromRGBA(250f / 255f, 225f / 255f, 235f / 255f, 1f) : UIColor.Clear;
// Draw the background
backgroundColor.SetFill();
context.FillRect(new CGRect(CGPoint.Empty, size));
// Draw the scaled composited image.
var drawRect = new CGRect {
Size = iceCreamSize,
X = outputSize.Width / 2f - iceCreamSize.Width / 2f,
Y = outputSize.Height / 2f - iceCreamSize.Height / 2f
};
partsImage.Draw(drawRect);
});
return(image);
}
private void RedrawFilterView()
{
var isAnimationEnabled = IsAnimationAllowed();
if (!isAnimationEnabled)
{
return;
}
var scale = UIScreen.MainScreen.Scale;
var radius = (float)(UIScreen.MainScreen.Bounds.Width >= 414 ? kBlurRadiusIphonePlus : kBlurRadiusDefault);
var bottomMargin = 10f;
var offsetY = -contentView.Bounds.Height / 2;
var bounds = new CGRect(valueView.Frame.X, offsetY, valueView.Frame.Size.Width, -offsetY + bottomMargin).Inset(-radius, 0);
var inputImage = new UIGraphicsImageRenderer(Bounds.Size).CreateImage(
(obj) => contentView.Layer.RenderInContext(obj.CGContext)
);
filter.BlurRadius = radius;
filter.Threshold = 0.49f;
filter.BackgroundColor = contentViewColor;
filter.AntialiasingRadius = (float)(scale / 2);
filter.InputImage = new CIImage(inputImage.CGImage);
var outputImage = filter.OutputImage?.ImageByCroppingToRect(
new CGRect(0, 0, inputImage.Size.Width * scale, inputImage.Size.Height * scale));
var cgImage = context.CreateCGImage(outputImage, outputImage.Extent);
filterView.Image = UIImage.FromImage(cgImage, scale, UIImageOrientation.Up);
filterView.Frame = bounds;
if (filterViewMask == null)
{
var renderer = new UIGraphicsImageRenderer(new CGRect(new CGPoint(), Bounds.Size).Size);
filterViewMask = renderer.CreateImage((ctx) =>
{
UIColor.White.SetFill();
ctx.FillRect(new CGRect(new CGPoint(), bounds.Size));
ctx.CGContext.ClearRect(new CGRect(0, bounds.Size.Height - bottomMargin, radius, bottomMargin));
ctx.CGContext.ClearRect(new CGRect(bounds.Size.Width - radius, bounds.Size.Height - bottomMargin, radius, bottomMargin));
});
((UIImageView)filterView.MaskView).Image = filterViewMask;
}
}
public static UIImage ConvertToImage(this UIView view)
{
if (!Forms.IsiOS10OrNewer)
{
UIGraphics.BeginImageContext(view.Frame.Size);
view.Layer.RenderInContext(UIGraphics.GetCurrentContext());
var image = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
return(new UIImage(image.CGImage));
}
var imageRenderer = new UIGraphicsImageRenderer(view.Bounds.Size);
return(imageRenderer.CreateImage((a) =>
{
view.Layer.RenderInContext(a.CGContext);
}));
}
/// <summary>
/// Generates and returns a thumbnail for the image using scale aspect fill.
/// </summary>
UIImage GenerateThumbnail(UIImage forImage, CGSize thumbnailSize)
{
var imageSize = forImage.Size;
var widthRatio = thumbnailSize.Width / imageSize.Width;
var heightRatio = thumbnailSize.Height / imageSize.Height;
var scaleFactor = widthRatio > heightRatio ? widthRatio : heightRatio;
var renderer = new UIGraphicsImageRenderer(thumbnailSize);
var newThumbnail = renderer.CreateImage((err) =>
{
var size = new CGSize(imageSize.Width * scaleFactor, imageSize.Height * scaleFactor);
var x = (thumbnailSize.Width - size.Width) / 2.0;
var y = (thumbnailSize.Height - size.Height) / 2.0;
forImage.Draw(new CGRect(new CGPoint(x, y), size));
});
return(newThumbnail);
}
private UIImage imageWithColor(UIColor imgColor)
{
var imgRenderer = new UIGraphicsImageRenderer(new CGSize(1, 1));
var img = imgRenderer.CreateImage((UIGraphicsImageRendererContext ctxt) =>
{
var superRed = UIColor.FromDisplayP3(1.358f, -0.074f, -0.012f, 1.0f);
superRed.SetFill();
UIColor.Black.SetStroke();
var path = new UIBezierPath();
path.MoveTo(new CGPoint(10, 10));
path.AddLineTo(new CGPoint(90, 10));
path.AddLineTo(new CGPoint(45, 90));
path.ClosePath();
path.Stroke();
path.Fill();
});
return(img);
}
public byte[] GetViewImage(View formsView)
{
var view = Platform.GetRenderer(formsView).NativeView;
var renderer = new UIGraphicsImageRenderer(view.Bounds.Size);
var jpgData = renderer.CreatePng(ctx =>
{
view.Alpha = 1.0f;
view.Layer.RenderInContext(ctx.CGContext);
view.Alpha = 0.0f;
});
var bytes = new byte[jpgData.Length];
System.Runtime.InteropServices.Marshal.Copy(jpgData.Bytes, bytes, 0, Convert.ToInt32(jpgData.Length));
return(bytes);
//UIGraphics.BeginImageContextWithOptions(view.Bounds.Size, true, 0);
//view.Alpha = 1.0f;
//view.Layer.RenderInContext(UIGraphics.GetCurrentContext());
//view.Alpha = 0.0f;
//var img = UIGraphics.GetImageFromCurrentImageContext();
//UIGraphics.EndImageContext();
//var imgData = img;
//UIGraphics.BeginImageContextWithOptions(view.Bounds.Size, view.Opaque, 1);
//view.DrawViewHierarchy(view.Frame, false); //this was key line
//UIImage imgData = UIGraphics.GetImageFromCurrentImageContext();
//UIGraphics.EndImageContext();
//var jpgData = imgData.AsJPEG();
//var bytes = new byte[jpgData.Length];
//System.Runtime.InteropServices.Marshal.Copy(jpgData.Bytes, bytes, 0, Convert.ToInt32(jpgData.Length));
//return bytes;
}
public static UIImage Convert(string pdfPath, bool directLink)
{
var localDocUrl = directLink ? pdfPath : Path.Combine(NSBundle.MainBundle.BundlePath, pdfPath);
var document = new CGPDFDocument(new CGDataProvider(localDocUrl));
var page = document.GetPage(1);
var pageRect = page.GetBoxRect(CGPDFBox.Media);
var renderer = new UIGraphicsImageRenderer(pageRect.Size);
var img = renderer.CreateImage(ctx => {
UIColor.White.SetFill();
ctx.FillRect(pageRect);
ctx.CGContext.TranslateCTM(0, pageRect.Size.Height);
ctx.CGContext.ScaleCTM(1, -1);
ctx.CGContext.DrawPDFPage(page);
});
return(img);
}
public static UIImage?ConvertToImage(this UIView view)
{
if (!NativeVersion.IsAtLeast(10))
{
UIGraphics.BeginImageContext(view.Frame.Size);
view.Layer.RenderInContext(UIGraphics.GetCurrentContext());
var image = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
if (image.CGImage == null)
{
return(null);
}
return(new UIImage(image.CGImage));
}
var imageRenderer = new UIGraphicsImageRenderer(view.Bounds.Size);
return(imageRenderer.CreateImage((a) =>
{
view.Layer.RenderInContext(a.CGContext);
}));
}
partial void AddAsset (NSObject sender)
{
var rnd = new Random ();
// Create a random dummy image.
var size = (rnd.Next (0, 2) == 0)
? new CGSize (400f, 300f)
: new CGSize (300f, 400f);
var renderer = new UIGraphicsImageRenderer (size);
var image = renderer.CreateImage (context => {
UIColor.FromHSBA ((float)rnd.NextDouble (), 1, 1, 1).SetFill ();
context.FillRect (context.Format.Bounds);
});
// Add it to the photo library
PHPhotoLibrary.SharedPhotoLibrary.PerformChanges (() => {
PHAssetChangeRequest creationRequest = PHAssetChangeRequest.FromImage (image);
if (AssetCollection != null) {
var addAssetRequest = PHAssetCollectionChangeRequest.ChangeRequest (AssetCollection);
addAssetRequest.AddAssets (new PHObject [] {
creationRequest.PlaceholderForCreatedAsset
});
}
}, (success, error) => {
if (!success)
Console.WriteLine (error.LocalizedDescription);
});
}
private VehicleImageContext GenerateMarkerImageWithText(string vehicleName)
{
NSString markerText = new NSString(vehicleName);
UIStringAttributes attributes = new UIStringAttributes {
Font = UIFont.FromName("Arial", 16), ForegroundColor = UIColor.White
};
CGSize sizeOfMarkerText = markerText.GetSizeUsingAttributes(attributes);
NSAttributedString markerString = new NSAttributedString(vehicleName, attributes);
// Calculate element sizes depending on text and text attributes like font and font size
float labelHeight = (float)Math.Ceiling(sizeOfMarkerText.Height * 2.0);
float labelWidth = (float)Math.Ceiling(sizeOfMarkerText.Width);
float labelEndSize = labelHeight;
float gpsPointSize = 10.0f;
float distanceBetweenLabelAndPoint = 10;
CGSize imageSize = new CGSize(labelWidth + (labelEndSize), labelHeight + distanceBetweenLabelAndPoint + gpsPointSize);
UIGraphicsImageRenderer renderer = new UIGraphicsImageRenderer(imageSize);
UIImage image = renderer.CreateImage((context) =>
{
// Color Declarations
UIColor blueZodiacColor = new UIColor(15.0f / 255f, 42.0f / 255f, 72.0f / 255f, 1.0f);
// Draw label rectangle
nfloat rectX = labelEndSize / 2.0f;
nfloat rectY = 0;
nfloat rectWidth = labelWidth;
nfloat rectHeight = labelHeight;
CGRect rectangleSize = new CGRect(rectX, rectY, rectWidth, rectHeight);
UIBezierPath rectanglePath = UIBezierPath.FromRect(rectangleSize);
blueZodiacColor.SetFill();
rectanglePath.Fill();
// Draw text
nfloat textX = rectangleSize.Location.X;
nfloat textY = rectangleSize.Location.Y + (rectangleSize.Size.Height / 4.0f);
nfloat textWidth = labelWidth;
nfloat textHeight = labelHeight;
markerString.DrawString(new CGRect(textX, textY, textWidth, textHeight));
// Draw label end left
nfloat endLeftX = 0;
nfloat endLeftY = 0;
CGRect endcupLeftRect = new CGRect(endLeftX, endLeftY, labelEndSize, labelEndSize);
UIBezierPath endcupLeftPath = new UIBezierPath();
endcupLeftPath.AddArc(new CGPoint(endcupLeftRect.GetMidX(), endcupLeftRect.GetMidY()), endcupLeftRect.Size.Width / 2, (nfloat)(90.0d * Math.PI / 180.0d), (nfloat)(-90.0d * Math.PI / 180.0d), true);
endcupLeftPath.AddLineTo(new CGPoint(endcupLeftRect.GetMidX(), endcupLeftRect.GetMidY()));
endcupLeftPath.ClosePath();
blueZodiacColor.SetFill();
endcupLeftPath.Fill();
// Draw label end right
nfloat endRightX = rectangleSize.Size.Width;
nfloat endRightY = 0;
CGRect endcupRightRect = new CGRect(endRightX, endRightY, labelEndSize, labelEndSize);
UIBezierPath endcupRightPath = new UIBezierPath();
endcupRightPath.AddArc(new CGPoint(endcupRightRect.GetMidX(), endcupRightRect.GetMidY()), endcupRightRect.Size.Width / 2, (nfloat)(270d * Math.PI / 180d), (nfloat)(90d * Math.PI / 180d), true);
endcupRightPath.AddLineTo(new CGPoint(endcupRightRect.GetMidX(), endcupRightRect.GetMidY()));
endcupRightPath.ClosePath();
blueZodiacColor.SetFill();
endcupRightPath.Fill();
// Draw GPS point
nfloat pointX = (nfloat)((imageSize.Width / 2.0) - (gpsPointSize / 2.0));
nfloat pointY = labelHeight + distanceBetweenLabelAndPoint;
UIBezierPath gpsPointPath = UIBezierPath.FromOval(new CGRect(pointX, pointY, gpsPointSize, gpsPointSize));
blueZodiacColor.SetFill();
gpsPointPath.Fill();
});
// Create vehicle image context and set image
VehicleImageContext vehicleImageContext = new VehicleImageContext();
vehicleImageContext.image = image;
// Calculate anchor offset to place the image correctly on the map
vehicleImageContext.anchorOffset = new CGPoint(0.0, -((imageSize.Height / 2.0) - (gpsPointSize / 2.0)));
return(vehicleImageContext);
}
UIImage CreateImageFromView(UIView briefView)
{
var renderer = new UIGraphicsImageRenderer(briefView.Bounds, format: UIGraphicsImageRendererFormat.DefaultFormat);
return(renderer.CreateImage(arg => briefView.Layer.RenderInContext(arg.CGContext)));
}
