void TestSaveAsync(Func <CanvasDevice, ICanvasImage> createImage)
{
const int width = 23;
const int height = 42;
var device = new CanvasDevice();
var sourceImage = createImage(device);
var stream = new MemoryStream();
var saveTask = Task.Run(async() =>
{
await CanvasImage.SaveAsync(sourceImage, new Rect(0, 0, width, height), 96, device, stream.AsRandomAccessStream(), CanvasBitmapFileFormat.Png);
});
saveTask.Wait();
CanvasBitmap result = null;
var loadTask = Task.Run(async() =>
{
result = await CanvasBitmap.LoadAsync(device, stream.AsRandomAccessStream());
});
loadTask.Wait();
Assert.AreEqual(width, result.Size.Width);
Assert.AreEqual(height, result.Size.Height);
}
public override void Run(IAnsiConsole console)
{
var image = new CanvasImage("../../../examples/Console/Canvas/cake.png");
image.MaxWidth(16);
console.Write(image);
}
public static void Main()
{
// Draw a mandelbrot set using a Canvas
var mandelbrot = Mandelbrot.Generate(32, 32);
Render(mandelbrot, "Mandelbrot");
// Draw an image using CanvasImage powered by ImageSharp.
// This requires the "Spectre.Console.ImageSharp" NuGet package.
var image = new CanvasImage("cake.png");
image.BilinearResampler();
image.MaxWidth(16);
Render(image, "Image from file (16 wide)");
// Draw image again, but without render width
image.NoMaxWidth();
image.Mutate(ctx => ctx.Grayscale().Rotate(-45).EntropyCrop());
Render(image, "Image from file (fit, greyscale, rotated)");
// Draw image again, but load from embedded resource rather than file
using (var fileStream = Assembly.GetExecutingAssembly().GetManifestResourceStream("Canvas.cake.png"))
{
Debug.Assert(fileStream != null);
var embeddedImage = new CanvasImage(fileStream);
embeddedImage.BilinearResampler();
embeddedImage.MaxWidth(16);
Render(embeddedImage, "Image from embedded resource (16 wide)");
}
}
public Canvas CreateCanvas(String name)
{
if (databaseContext.Canvases.Find(name) != null)
{
BadRequest("A canvas with this name already exists");
}
Canvas newCanvas = new Canvas();
newCanvas.Name = name;
newCanvas.Version = 1;
databaseContext.Canvases.Add(newCanvas);
databaseContext.SaveChanges();
CanvasImage canvasImage = new CanvasImage();
canvasImage.InitializeBitmap();
canvasImage.canvas = databaseContext.Canvases.Find(name);
canvasImage.Name = name;
databaseContext.CanvasImages.Add(canvasImage);
databaseContext.SaveChanges();
return(newCanvas);
}
//创建直方图
private void DrawHistogram(CanvasDrawingSession drawingSession, Size size, EffectChannelSelect channelSelect, CanvasLinearGradientBrush brush)
{
int binCount = (int)CanvasControl.ActualWidth; //256;//矩形数量
const float graphPower = 0.25f; // 非线性规模使得图更清楚地显示微小的变化。
try
{
float[] histogram = CanvasImage.ComputeHistogram(App.Model.MainRenderTarget, App.Model.MainRenderTarget.Bounds, drawingSession, channelSelect, binCount);
var w = (float)size.Width / binCount;
var h = (float)size.Height;
for (int i = 0; i < binCount; i++)
{
var x = i * w;
var y = (1 - (float)Math.Pow(histogram[i], graphPower)) * h;
brush.StartPoint = new Vector2(x, y);
brush.EndPoint = new Vector2(x, h);
drawingSession.FillRectangle(x, y, w, h - y, brush);
}
}
catch (Exception) { }
}
public void DeleteCanvas(String name)
{
Canvas canvas = databaseContext.Canvases.Find(name);
if (canvas == null)
{
NotFound();
}
databaseContext.Canvases.Remove(canvas);
CanvasImage canvasImage = databaseContext.CanvasImages.Find(name);
if (canvasImage != null)
{
databaseContext.CanvasImages.Remove(canvasImage);
}
List <PixelChange> pixelChanges = databaseContext.PixelChanges.Where(p => p.Canvas.Name == canvas.Name).ToList();
foreach (PixelChange pixelChange in pixelChanges)
{
databaseContext.PixelChanges.Remove(pixelChange);
}
databaseContext.SaveChanges();
}
/// GET: CanvasImage?name=""&version=#
/// Returns a .png image representing the canvas.
///
public ActionResult Index(String name, String version)
{
// Check for cached image first
System.IO.MemoryStream cachedMemoryStream = (System.IO.MemoryStream)System.Web.HttpContext.Current.Cache.Get(name + "&" + version);
if (cachedMemoryStream != null)
{
return(File(cachedMemoryStream.ToArray(), "image/png"));
}
// Get canvas from database
CanvasImage canvasImage = databaseContext.CanvasImages.Find(name);
if (canvasImage == null)
{
return(HttpNotFound());
}
// Apply all changed pixels, save, and generate png
ApplyChangedPixelsToImage(canvasImage);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
canvasImage.GetBitmap().Save(ms, System.Drawing.Imaging.ImageFormat.Png);
// Save to cache
System.Web.HttpContext.Current.Cache.Insert(name + "&" + version, (object)ms);
return(File(ms.ToArray(), "image/png"));
}
/// <summary>
/// Helper method that applies any pixel changes between the image version and the latest version
/// </summary>
/// <param name="canvas">Which canvas to apply changes to</param>
private void ApplyChangedPixelsToImage(CanvasImage canvasImage)
{
Canvas canvas = canvasImage.canvas;
// Get changed pixels
IEnumerable <PixelChange> pixelChanges = databaseContext.PixelChanges
.Where(p => p.CanvasVersion > canvas.ImageVersion && p.Canvas.Name == canvas.Name)
.OrderBy(p => p.CanvasVersion);
if (!pixelChanges.Any())
{
return;
}
// Update bitmap with changes
Bitmap bitmap = canvasImage.GetBitmap();
foreach (PixelChange pixelChange in pixelChanges)
{
bitmap.SetPixel(pixelChange.X, pixelChange.Y, ColorTranslator.FromHtml(pixelChange.Color));
//placeContext.PixelChanges.Remove(pixelChange);
}
canvasImage.SetBitmap(bitmap);
canvas.ImageVersion = pixelChanges.Last().CanvasVersion;
databaseContext.SaveChanges();
}
private void CanvasPanel_MouseMove(object sender, MouseEventArgs e)
{
if (_isMouseDown)
{
var x = Mouse.GetPosition(CanvasPanel).X;
var y = Mouse.GetPosition(CanvasPanel).Y;
if (x >= _ellipseHalfWidth && x <= CanvasImage.Width - _ellipseHalfWidth - 1 && y >= _ellipseHalfHeight && y <= CanvasImage.Height - _ellipseHalfHeight - 1)
{
try
{
var croppedBitmap = new CroppedBitmap(ColorImage.Source as BitmapSource, new Int32Rect(Convert.ToInt32(x), Convert.ToInt32(y), 1, 1));
var pixels = new byte[4];
croppedBitmap.CopyPixels(pixels, 4, 0);
SelectedColor = Color.FromArgb(255, pixels[2], pixels[1], pixels[0]);
MoveEllipse(x, y, SelectedColor);
UpdateTextBox();
ColorRectangle.Fill = new SolidColorBrush(SelectedColor);
}
catch (Exception)
{
_isMouseDown = false;
SetColor(Colors.White);
}
finally
{
CanvasImage.InvalidateVisual();
}
}
else
{
_isMouseDown = false;
}
}
}
public override IView ConvertToView(FigmaNode currentNode, ViewNode parent, ViewRenderService rendererService)
{
var currengroupView = new CanvasImage();
currengroupView.Configure((FigmaRegularPolygon)currentNode);
return(new ImageView());// currengroupView);
}
public override IViewWrapper ConvertTo(FigmaNode currentNode, ProcessedNode parent)
{
var currengroupView = new CanvasImage();
currengroupView.Configure((FigmaRegularPolygon)currentNode);
return(new ImageViewWrapper(currengroupView));
}
private async void DialController_ButtonClicked(RadialController sender, RadialControllerButtonClickedEventArgs args)
{
try
{
ShowBusyIndicator("saving file...");
var picker = new FileSavePicker();
picker.FileTypeChoices.Add("Jpegs", new List <string>()
{
".jpg"
});
var file = await picker.PickSaveFileAsync();
if (file == null)
{
return;
}
using (var stream = await file.OpenAsync(FileAccessMode.ReadWrite))
{
// watermark the image
var device = CanvasDevice.GetSharedDevice();
var bounds = virtualBitmap.Bounds;
var text = new CanvasCommandList(device);
using (var ds = text.CreateDrawingSession())
{
ds.DrawText("Created by Dial-In", bounds, Colors.White,
new CanvasTextFormat
{
VerticalAlignment = CanvasVerticalAlignment.Bottom,
HorizontalAlignment = CanvasHorizontalAlignment.Right,
FontFamily = "Segoe UI",
FontSize = (float)(bounds.Height / 12)
});
}
var effect = new BlendEffect()
{
Background = virtualBitmap,
Foreground = text,
Mode = BlendEffectMode.Difference
};
// save the image to final file
await CanvasImage.SaveAsync(effect, bounds, 96, device, stream, CanvasBitmapFileFormat.Jpeg);
}
}
catch (Exception ex)
{
await new MessageDialog($"Something went wrong saving the image: {ex}", "Exception").ShowAsync();
}
finally
{
HideBusyIndicator();
}
}
public void CanvasImage_SaveAsync_HdrFormats()
{
var pixelFormats = new Dictionary <CanvasBufferPrecision, DirectXPixelFormat>
{
{ CanvasBufferPrecision.Precision8UIntNormalized, DirectXPixelFormat.B8G8R8A8UIntNormalized },
{ CanvasBufferPrecision.Precision16Float, DirectXPixelFormat.R16G16B16A16Float },
{ CanvasBufferPrecision.Precision32Float, DirectXPixelFormat.R32G32B32A32Float },
{ CanvasBufferPrecision.Precision16UIntNormalized, DirectXPixelFormat.R16G16B16A16UIntNormalized },
};
CanvasBitmapFileFormat[] fileFormats =
{
CanvasBitmapFileFormat.Bmp,
CanvasBitmapFileFormat.Gif,
CanvasBitmapFileFormat.Jpeg,
CanvasBitmapFileFormat.JpegXR,
CanvasBitmapFileFormat.Png,
CanvasBitmapFileFormat.Tiff,
};
var device = new CanvasDevice();
var sourceBitmap = new CanvasRenderTarget(device, 1, 1, 96);
foreach (var pixelFormat in pixelFormats)
{
foreach (var fileFormat in fileFormats)
{
bool fileFormatSupportsHdr = (fileFormat == CanvasBitmapFileFormat.JpegXR);
using (var stream = new MemoryStream())
{
var saveTask = CanvasImage.SaveAsync(sourceBitmap,
sourceBitmap.Bounds,
sourceBitmap.Dpi,
device,
stream.AsRandomAccessStream(),
fileFormat,
0.9f,
pixelFormat.Key).AsTask();
saveTask.Wait();
var loadTask = CanvasBitmap.LoadAsync(device, stream.AsRandomAccessStream()).AsTask();
loadTask.Wait();
var loadedBitmap = loadTask.Result;
var expectedFormat = pixelFormat.Value;
if (!fileFormatSupportsHdr || !device.IsPixelFormatSupported(expectedFormat))
{
expectedFormat = DirectXPixelFormat.B8G8R8A8UIntNormalized;
}
Assert.AreEqual(expectedFormat, loadedBitmap.Format, "File format: {0}, pixel format: {1}", fileFormat, pixelFormat);
}
}
}
}
public override void Run(IAnsiConsole console)
{
var image = new CanvasImage("../../../examples/Console/Canvas/cake.png");
image.MaxWidth(24);
image.BilinearResampler();
image.Mutate(ctx => ctx.Grayscale().Rotate(-45).EntropyCrop());
console.Write(image);
}
public override IView ConvertToView(FigmaNode currentNode, ViewNode parent, ViewRenderService rendererService)
{
var figmaEntity = (FigmaVector)currentNode;
var image = new CanvasImage();
var figmaImageView = new ImageView();
image.Configure(figmaEntity);
return(figmaImageView);
}
/// <summary>
/// Sets the pixel width.
/// </summary>
/// <param name="image">The canvas image.</param>
/// <param name="width">The pixel width.</param>
/// <returns>The same instance so that multiple calls can be chained.</returns>
public static CanvasImage PixelWidth(this CanvasImage image, int width)
{
if (image is null)
{
throw new ArgumentNullException(nameof(image));
}
image.PixelWidth = width;
return(image);
}
/// <summary>
/// Disables the maximum width of the rendered image.
/// </summary>
/// <param name="image">The canvas image.</param>
/// <returns>The same instance so that multiple calls can be chained.</returns>
public static CanvasImage NoMaxWidth(this CanvasImage image)
{
if (image is null)
{
throw new ArgumentNullException(nameof(image));
}
image.MaxWidth = null;
return(image);
}
/// <summary>
/// Uses a bilinear sampler. This interpolation algorithm
/// can be used where perfect image transformation with pixel matching is impossible,
/// so that one can calculate and assign appropriate intensity values to pixels.
/// </summary>
/// <param name="image">The canvas image.</param>
/// <returns>The same instance so that multiple calls can be chained.</returns>
public static CanvasImage BilinearResampler(this CanvasImage image)
{
if (image is null)
{
throw new ArgumentNullException(nameof(image));
}
image.Resampler = KnownResamplers.Triangle;
return(image);
}
/// <summary>
/// Uses a bicubic sampler that implements the bicubic kernel algorithm W(x).
/// </summary>
/// <param name="image">The canvas image.</param>
/// <returns>The same instance so that multiple calls can be chained.</returns>
public static CanvasImage BicubicResampler(this CanvasImage image)
{
if (image is null)
{
throw new ArgumentNullException(nameof(image));
}
image.Resampler = KnownResamplers.Bicubic;
return(image);
}
public override IViewWrapper ConvertTo(FigmaNode currentNode, ProcessedNode parent)
{
var vector = ((FigmaRectangleVector)currentNode);
var image = new CanvasImage();
var figmaImageView = new ImageViewWrapper();
image.Configure(vector);
return(figmaImageView);
}
public override IViewWrapper ConvertTo(FigmaNode currentNode, ProcessedNode parent)
{
var figmaEntity = (FigmaVectorEntity)currentNode;
var image = new CanvasImage();
var figmaImageView = new ImageViewWrapper();
image.Configure(figmaEntity);
return(figmaImageView);
}
/// <summary>
/// Uses a Nearest-Neighbour sampler that implements the nearest neighbor algorithm.
/// This uses a very fast, unscaled filter which will select the closest pixel to
/// the new pixels position.
/// </summary>
/// <param name="image">The canvas image.</param>
/// <returns>The same instance so that multiple calls can be chained.</returns>
public static CanvasImage NearestNeighborResampler(this CanvasImage image)
{
if (image is null)
{
throw new ArgumentNullException(nameof(image));
}
image.Resampler = KnownResamplers.NearestNeighbor;
return(image);
}
public override IView ConvertTo(FigmaNode currentNode, ProcessedNode parent, FigmaRendererService rendererService)
{
var vector = (RectangleVector)currentNode;
var image = new CanvasImage();
var figmaImageView = new ImageView();
image.Configure(vector);
return(figmaImageView);
}
/// <summary>
/// Update the read state of this item from the message.
/// </summary>
public void UpdateImage()
{
CanvasImage imageItem = (CanvasImage)CanvasItemLayout[ActionID.AuthorImage];
if (imageItem != null)
{
imageItem.Image = Image;
Invalidate();
}
}
public override IView ConvertTo(FigmaNode currentNode, ProcessedNode parent, FigmaRendererService rendererService)
{
var figmaEntity = (FigmaElipse)currentNode;
var image = new CanvasImage();
var elipseView = new View(image);
image.Configure(figmaEntity);
return(elipseView);
}
public static iText.Layout.Element.Image ToIText(this CanvasImage canvasImage)
{
var info = new UIElementInfo(canvasImage.Image, canvasImage.Canvas);
var src = ImageDataFactory.Create(canvasImage.ImagePath);
var image = new iText.Layout.Element.Image(src, info.Left, info.Bottom);
image.SetFixedPosition(info.Left, info.Bottom);
image.ScaleAbsolute(info.ElementWidth, info.ElementHeight);
return(image);
}
public CanvasImage CreateImage(int id, Rect extent, BitmapImage image)
{
var canvasImage = new CanvasImage()
{
Id = id,
X = extent.X,
Y = extent.Y,
Width = extent.Width,
Height = extent.Height,
Image = image
};
return(canvasImage);
}
public static async Task <WriteableBitmap> WriteToWriteableBitmapAsync(this ICanvasImage canvasImage,
ICanvasResourceCreator canvasResourceCreator, Size size, float dpi)
{
// Initialize the in-memory stream where data will be stored.
using (var stream = new InMemoryRandomAccessStream())
{
await CanvasImage.SaveAsync(canvasImage, new Rect(new Point(0, 0), size), dpi, canvasResourceCreator,
stream,
CanvasBitmapFileFormat.Png);
stream.Seek(0);
return(await BitmapFactory.FromStream(stream));
}
}
/// <summary>
/// Mutates the underlying image.
/// </summary>
/// <param name="image">The canvas image.</param>
/// <param name="action">The action that mutates the underlying image.</param>
/// <returns>The same instance so that multiple calls can be chained.</returns>
public static CanvasImage Mutate(this CanvasImage image, Action <IImageProcessingContext> action)
{
if (image is null)
{
throw new ArgumentNullException(nameof(image));
}
if (action is null)
{
throw new ArgumentNullException(nameof(action));
}
image.Image.Mutate(action);
return(image);
}
public void SetUp()
{
_controlSize = new Size();
_viewExtent = new Rect();
_plot = new PlotDto()
{
Id = 1,
X = 1d,
Y = 2d,
Color = new Domain.Colors.Color(0, 0, 0),
Label = "Test",
Image = new BitmapImage()
};
_plots = new List <PlotDto> {
_plot
};
_canvasCircle = new CanvasCircle();
_canvasImage = new CanvasImage();
_canvasLabel = new CanvasLabel();
_mockResizer = new Mock <IViewResizer>();
_mockResizer.Setup(p => p.ResizeView(_controlSize, _viewExtent))
.Returns(_viewExtent);
_mockComputer = new Mock <IScaleComputer>();
_mockComputer.Setup(p => p.ComputeScale(_controlSize, _viewExtent)).Returns(1d);
_mockCalculator = new Mock <IGeometryCalculator>();
_mockFactory = new Mock <IGeometryFactory>();
_mockFactory.Setup(p => p.CreateCircle(_plot.Id, It.IsAny <Rect>(), It.IsAny <Color>()))
.Returns(_canvasCircle);
_mockFactory.Setup(p => p.CreateImage(_plot.Id, It.IsAny <Rect>(), _plot.Image))
.Returns(_canvasImage);
_mockFactory.Setup(p => p.CreateLabel(_plot.Id, It.IsAny <Point>(), _plot.Label))
.Returns(_canvasLabel);
_renderer = new PlotRenderer(
_mockResizer.Object,
_mockComputer.Object,
_mockCalculator.Object,
_mockFactory.Object);
}
void CreateItemsProgramatically()
{
// Adding image
CanvasImage image = new CanvasImage (new Pixbuf (null, "logo.png"));
image.Move (50, 50);
canvas.Root.Add (image);
// Adding textbox
CanvasTextBox textbox = new CanvasTextBox();
textbox.Move (50, 150);
canvas.Root.Add (textbox);
// Adding line
Dia.CanvasLine line = new Dia.CanvasLine();
line.LineWidth = 10;
line.Color = 8327327;
// Broke between 0.13 and 0.14
// line.Dash = new double [] { 2, 4, 8, 16, 32 };
line.HeadPos = new Dia.Point (50, 70);;
line.TailPos = new Dia.Point (200, 250);
line.Cap = Dia.CapStyle.Butt;
line.Move (50, 150);
canvas.Root.Add (line);
// Adding box
CanvasBox box = new CanvasBox();
box.BorderWidth = 8.5;
box.Color = 2134231;
box.Move (250, 225);
canvas.Root.Add (box);
// Adding custom clock
CanvasClock clock = new CanvasClock ();
clock.Width = 100;
clock.Height = 100;
clock.Move (450, 225);
canvas.Root.Add (clock);
// Adding custom figure
CanvasFigure figure = new CanvasFigure();
figure.Move (50, 325);
canvas.Root.Add (figure);
view.UnselectAll();
CanvasViewItem vitem = view.FindViewItem (image);
view.Focus (vitem);
}