RUS/SourceCode/OnGoingTasks/CameraDataCapture/Demo/ImageCanvas.xaml.cs

using AI.Common;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Threading;
using Rect = AI.Common.Rect;

namespace CameraImageCaptureTest
{
    public class RoiInfo
    {
        public Rect RoiRect { get; set; }

        public System.Windows.Media.Brush Color { get; set; }

        public RoiInfo(Rect roi, System.Windows.Media.Brush color)
        {
            RoiRect = roi;
            Color = color;
        }

    }

    public class OrganInfo
    {
        public string OrganName { get; set; }

        public Rect BoundingBox { get; set; }

        public Point2D[][] Contours { get; set; }

        public System.Windows.Media.Brush Color => System.Windows.Media.Brushes.Green;

        public OrganInfo(string organName, Rect boundingBox, Point2D[][] contours)
        {
            OrganName = organName;
            BoundingBox = boundingBox;
            Contours = contours;
        }
    }

    public class MyTransform
    {
        public double Scale { get; set; }

        public double OffsetX { get; set; }

        public double OffsetY { get; set; }

        public MyTransform(double scale, double offsetX, double offsetY)
        {
            Scale = scale;
            OffsetX = offsetX;
            OffsetY = offsetY;
        }

        public System.Windows.Point Transform(System.Windows.Point point)
        {
            double x = OffsetX + Scale * point.X;
            double y = OffsetY + Scale * point.Y;
            return new System.Windows.Point(x, y);
        }

        public System.Windows.Rect Transform(System.Windows.Rect rect)
        {
            double left = OffsetX + Scale * rect.Left;
            double top = OffsetY + Scale * rect.Top;
            double width = Scale * rect.Width;
            double height = Scale * rect.Height;
            return new System.Windows.Rect(left, top, width, height);
        }

    }

    /// <summary>
    /// ImageCanvas.xaml 的交互逻辑
    /// </summary>
    public partial class ImageCanvas : UserControl
    {

        #region private variables

        private Bitmap _imageRGB;
        private MyTransform _transformRGB;


        #endregion


        #region 用户界面响应

        private void CanvasSizeChanged(object sender, System.Windows.SizeChangedEventArgs e)
        {
            UpdateRGBTransforms();
        }

        #endregion


        #region public funcs

        public ImageCanvas()
        {
            InitializeComponent();
        }

        public void UpdateRGBImage(Bitmap image)
        {
            if (_imageRGB != null)
            {
                _imageRGB.Dispose();
            }
            _imageRGB = image.Clone(new System.Drawing.Rectangle(0, 0, image.Width, image.Height), image.PixelFormat);
            // 更新缩放比例
            UpdateRGBTransforms();
            // 更新图像显示
            var bitmapImage = BitmapToBitmapImage(image);
            Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() =>
            {
                RGBImageShow.Source = bitmapImage;
            }));
        }

        #endregion


        #region private funcs
        private BitmapImage BitmapToBitmapImage(Bitmap img)
        {
            BitmapImage bmpimg = new BitmapImage();
            using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
            {
                img.Save(ms, ImageFormat.Png);
                bmpimg.BeginInit();
                bmpimg.StreamSource = ms;
                bmpimg.CacheOption = BitmapCacheOption.OnLoad;
                bmpimg.EndInit();
                bmpimg.Freeze();
                ms.Dispose();
            }
            return bmpimg;
        }

        private void UpdateRGBTransforms()
        {
            if (_imageRGB != null)
            {
                // 使图片保持长宽比例，居中显示，需要平移和缩放
                var imgWidth = _imageRGB.Width;
                var imgHeight = _imageRGB.Height;
                var canvasWidth = RGBImageCanvas.ActualWidth;
                var canvasHeight = RGBImageCanvas.ActualHeight;
                var scaleX = canvasWidth / imgWidth;
                var scaleY = canvasHeight / imgHeight;
                var scale = scaleX < scaleY ? scaleX : scaleY;
                double offsetX, offsetY;
                if (Math.Abs(scale - scaleX) < 0.0001)
                {
                    offsetY = 0.5 * (scaleY - scale) * imgHeight;
                    offsetX = 0;
                }
                else
                {
                    offsetX = 0.5 * (scaleX - scale) * imgWidth;
                    offsetY = 0;
                }
                _transformRGB = new MyTransform(scale, offsetX, offsetY);
            }
        }

        #endregion

    }
}