// --------------------------------------------------------------------------------------------------------------------
// <copyright file="ImageAnnotationExamples.cs" company="OxyPlot">
// Copyright (c) 2014 OxyPlot contributors
// </copyright>
// --------------------------------------------------------------------------------------------------------------------

namespace ExampleLibrary
{
 using System;
 using System.Reflection;

 using OxyPlot;
 using OxyPlot.Annotations;
 using OxyPlot.Axes;
 using OxyPlot.Series;

 [Examples("ImageAnnotation"), Tags("Annotations")]
 public static class ImageAnnotationExamples
 {
 [Example("ImageAnnotation")]
 public static PlotModel ImageAnnotation()
 {
 var model = new PlotModel { Title = "ImageAnnotation", PlotMargins = new OxyThickness(60, 4, 4, 60) };
 model.Axes.Add(new LinearAxis { Position = AxisPosition.Bottom });
 model.Axes.Add(new LinearAxis { Position = AxisPosition.Left });

 OxyImage image;
 var assembly = typeof(ImageAnnotationExamples).GetTypeInfo().Assembly;
 using (var stream = assembly.GetManifestResourceStream("ExampleLibrary.Resources.OxyPlot.png"))
 {
 image = new OxyImage(stream);
 }

 // Centered in plot area, filling width
 model.Annotations.Add(new ImageAnnotation
 {
 ImageSource = image,
 Opacity = 0.2,
 Interpolate = false,
 X = new PlotLength(0.5, PlotLengthUnit.RelativeToPlotArea),
 Y = new PlotLength(0.5, PlotLengthUnit.RelativeToPlotArea),
 Width = new PlotLength(1, PlotLengthUnit.RelativeToPlotArea),
 HorizontalAlignment = HorizontalAlignment.Center,
 VerticalAlignment = VerticalAlignment.Middle
 });

 // Relative to plot area, inside top/right corner, 120pt wide
 model.Annotations.Add(new ImageAnnotation
 {
 ImageSource = image,
 X = new PlotLength(1, PlotLengthUnit.RelativeToPlotArea),
 Y = new PlotLength(0, PlotLengthUnit.RelativeToPlotArea),
 Width = new PlotLength(120, PlotLengthUnit.ScreenUnits),
 HorizontalAlignment = HorizontalAlignment.Right,
 VerticalAlignment = VerticalAlignment.Top
 });

 // Relative to plot area, above top/left corner, 20pt high
 model.Annotations.Add(new ImageAnnotation
 {
 ImageSource = image,
 X = new PlotLength(0, PlotLengthUnit.RelativeToPlotArea),
 Y = new PlotLength(0, PlotLengthUnit.RelativeToPlotArea),
 OffsetY = new PlotLength(-5, PlotLengthUnit.ScreenUnits),
 Height = new PlotLength(20, PlotLengthUnit.ScreenUnits),
 HorizontalAlignment = HorizontalAlignment.Left,
 VerticalAlignment = VerticalAlignment.Bottom
 });

 // At the point (50,50), 200pt wide
 model.Annotations.Add(new ImageAnnotation
 {
 ImageSource = image,
 X = new PlotLength(50, PlotLengthUnit.Data),
 Y = new PlotLength(50, PlotLengthUnit.Data),
 Width = new PlotLength(200, PlotLengthUnit.ScreenUnits),
 HorizontalAlignment = HorizontalAlignment.Left,
 VerticalAlignment = VerticalAlignment.Top
 });

 // At the point (50,20), 50 x units wide
 model.Annotations.Add(new ImageAnnotation
 {
 ImageSource = image,
 X = new PlotLength(50, PlotLengthUnit.Data),
 Y = new PlotLength(20, PlotLengthUnit.Data),
 Width = new PlotLength(50, PlotLengthUnit.Data),
 HorizontalAlignment = HorizontalAlignment.Center,
 VerticalAlignment = VerticalAlignment.Top
 });

 // Relative to the viewport, centered at the bottom, with offset (could also use bottom vertical alignment)
 model.Annotations.Add(new ImageAnnotation
 {
 ImageSource = image,
 X = new PlotLength(0.5, PlotLengthUnit.RelativeToViewport),
 Y = new PlotLength(1, PlotLengthUnit.RelativeToViewport),
 OffsetY = new PlotLength(-35, PlotLengthUnit.ScreenUnits),
 Height = new PlotLength(30, PlotLengthUnit.ScreenUnits),
 HorizontalAlignment = HorizontalAlignment.Center,
 VerticalAlignment = VerticalAlignment.Top
 });

 // Changing opacity
 for (int y = 0; y < 10; y++)
 {
 model.Annotations.Add(
 new ImageAnnotation
 {
 ImageSource = image,
 Opacity = (y + 1) / 10.0,
 X = new PlotLength(10, PlotLengthUnit.Data),
 Y = new PlotLength(y * 2, PlotLengthUnit.Data),
 Width = new PlotLength(100, PlotLengthUnit.ScreenUnits),
 HorizontalAlignment = HorizontalAlignment.Center,
 VerticalAlignment = VerticalAlignment.Bottom
 });
 }

 return model;
 }

 [Example("ImageAnnotation - gradient backgrounds")]
 public static PlotModel ImageAnnotationAsBackgroundGradient()
 {
 // http://en.wikipedia.org/wiki/Chartjunk
 var model = new PlotModel { Title = "Using ImageAnnotations to draw a gradient backgrounds", Subtitle = "But do you really want this? This is called 'chartjunk'!", PlotMargins = new OxyThickness(60, 4, 4, 60) };
 model.Axes.Add(new LinearAxis { Position = AxisPosition.Bottom });
 model.Axes.Add(new LinearAxis { Position = AxisPosition.Left });

 // create a gradient image of height n
 int n = 256;
 var imageData1 = new OxyColor[1, n];
 for (int i = 0; i < n; i++)
 {
 imageData1[0, i] = OxyColor.Interpolate(OxyColors.Blue, OxyColors.Red, i / (n - 1.0));
 }

 var image1 = OxyImage.Create(imageData1, ImageFormat.Png); // png is required for silverlight

 // or create a gradient image of height 2 (requires bitmap interpolation to be supported)
 var imageData2 = new OxyColor[1, 2];
 imageData2[0, 0] = OxyColors.Yellow; // top color
 imageData2[0, 1] = OxyColors.Gray; // bottom color

 var image2 = OxyImage.Create(imageData2, ImageFormat.Png); // png is required for silverlight

 // gradient filling the viewport
 model.Annotations.Add(new ImageAnnotation
 {
 ImageSource = image2,
 Interpolate = true,
 Layer = AnnotationLayer.BelowAxes,
 X = new PlotLength(0, PlotLengthUnit.RelativeToViewport),
 Y = new PlotLength(0, PlotLengthUnit.RelativeToViewport),
 Width = new PlotLength(1, PlotLengthUnit.RelativeToViewport),
 Height = new PlotLength(1, PlotLengthUnit.RelativeToViewport),
 HorizontalAlignment = HorizontalAlignment.Left,
 VerticalAlignment = VerticalAlignment.Top
 });

 // gradient filling the plot area
 model.Annotations.Add(new ImageAnnotation
 {
 ImageSource = image1,
 Interpolate = true,
 Layer = AnnotationLayer.BelowAxes,
 X = new PlotLength(0, PlotLengthUnit.RelativeToPlotArea),
 Y = new PlotLength(0, PlotLengthUnit.RelativeToPlotArea),
 Width = new PlotLength(1, PlotLengthUnit.RelativeToPlotArea),
 Height = new PlotLength(1, PlotLengthUnit.RelativeToPlotArea),
 HorizontalAlignment = HorizontalAlignment.Left,
 VerticalAlignment = VerticalAlignment.Top
 });

 // verify that a series is rendered above the gradients
 model.Series.Add(new FunctionSeries(Math.Sin, 0, 7, 0.01));

 return model;
 }

 [Example("ImageAnnotation - normal axes")]
 public static PlotModel ImageAnnotation_NormalAxes()
 {
 var model = new PlotModel { Title = "ImageAnnotation - normal axes" };
 model.Axes.Add(new LinearAxis { Position = AxisPosition.Bottom });
 model.Axes.Add(new LinearAxis { Position = AxisPosition.Left });

 // create an image
 var pixels = new OxyColor[2, 2];
 pixels[0, 0] = OxyColors.Blue;
 pixels[1, 0] = OxyColors.Yellow;
 pixels[0, 1] = OxyColors.Green;
 pixels[1, 1] = OxyColors.Red;

 var image = OxyImage.Create(pixels, ImageFormat.Png);

 model.Annotations.Add(
 new ImageAnnotation
 {
 ImageSource = image,
 Interpolate = false,
 X = new PlotLength(0, PlotLengthUnit.Data),
 Y = new PlotLength(0, PlotLengthUnit.Data),
 Width = new PlotLength(80, PlotLengthUnit.Data),
 Height = new PlotLength(50, PlotLengthUnit.Data),
 HorizontalAlignment = HorizontalAlignment.Left,
 VerticalAlignment = VerticalAlignment.Bottom
 });
 return model;
 }

 [Example("ImageAnnotation - reverse horizontal axis")]
 public static PlotModel ImageAnnotation_ReverseHorizontalAxis()
 {
 var model = new PlotModel { Title = "ImageAnnotation - reverse horizontal axis" };
 model.Axes.Add(new LinearAxis { Position = AxisPosition.Bottom, StartPosition = 1, EndPosition = 0 });
 model.Axes.Add(new LinearAxis { Position = AxisPosition.Left });

 // create an image
 var pixels = new OxyColor[2, 2];
 pixels[0, 0] = OxyColors.Blue;
 pixels[1, 0] = OxyColors.Yellow;
 pixels[0, 1] = OxyColors.Green;
 pixels[1, 1] = OxyColors.Red;

 var image = OxyImage.Create(pixels, ImageFormat.Png);

 model.Annotations.Add(
 new ImageAnnotation
 {
 ImageSource = image,
 Interpolate = false,
 X = new PlotLength(100, PlotLengthUnit.Data),
 Y = new PlotLength(0, PlotLengthUnit.Data),
 Width = new PlotLength(80, PlotLengthUnit.Data),
 Height = new PlotLength(50, PlotLengthUnit.Data),
 HorizontalAlignment = HorizontalAlignment.Left,
 VerticalAlignment = VerticalAlignment.Bottom
 });
 return model;
 }

 [Example("ImageAnnotation - reverse vertical axis")]
 public static PlotModel ImageAnnotation_ReverseVerticalAxis()
 {
 var model = new PlotModel { Title = "ImageAnnotation - reverse vertical axis" };
 model.Axes.Add(new LinearAxis { Position = AxisPosition.Bottom });
 model.Axes.Add(new LinearAxis { Position = AxisPosition.Left, StartPosition = 1, EndPosition = 0 });

 // create an image
 var pixels = new OxyColor[2, 2];
 pixels[0, 0] = OxyColors.Blue;
 pixels[1, 0] = OxyColors.Yellow;
 pixels[0, 1] = OxyColors.Green;
 pixels[1, 1] = OxyColors.Red;

 var image = OxyImage.Create(pixels, ImageFormat.Png);

 model.Annotations.Add(
 new ImageAnnotation
 {
 ImageSource = image,
 Interpolate = false,
 X = new PlotLength(0, PlotLengthUnit.Data),
 Y = new PlotLength(100, PlotLengthUnit.Data),
 Width = new PlotLength(80, PlotLengthUnit.Data),
 Height = new PlotLength(50, PlotLengthUnit.Data),
 HorizontalAlignment = HorizontalAlignment.Left,
 VerticalAlignment = VerticalAlignment.Bottom
 });
 return model;
 }
 }
}