C#開發PACS醫學影像處理系統(十六)：2D處理之影像平移和縮放

時間 2021-01-11

原文原文鏈接

1.平移，利用WPF中控件邊距來控制位移：html

　　　　 /// <summary>
        /// 平移圖像
        /// </summary>
        /// <param name="X">平移X軸距離</param>
        /// <param name="startX">X軸起始位置</param>
        /// <param name="Y">平移Y軸距離</param>
        /// <param name="startY">Y軸起始位置</param>
        /// <param name="isAction">是主動發起仍是關聯操做時被動調用</param>
        internal void MoveImage(double X, double startX, double Y, double startY, bool isAction = true)
        {
            GridLine.Margin = new Thickness(
               GridLine.Margin.Left + X - startX,
               GridLine.Margin.Top + Y - startY,
               GridLine.Margin.Right - X + startX,
               GridLine.Margin.Bottom - Y + startY);

            if (isAction)
            {
                for (int i = 0; i < Cell.MedicalView.SelectedBoxList.Count; i++)
                {
                    var box = Cell.MedicalView.SelectedBoxList[i];
                    if (box != this)
                    {
                        box.MoveImage(X, startX, Y, startY, false);
                    }
                }
            }

            //平移全部box
            for (int i = 0; i < Cell.BoxList.Count; i++)
            {
                if (Cell.BoxList[i] != this && (Cell.BoxList[i].ImageAlign == ImageAlignment.Center || Cell.BoxList[i].ImageAlign == ImageAlignment.Parent))
                {
                    Cell.BoxList[i].GridLine.Margin = GridLine.Margin;
                }
            }
        }

看效果：算法

2.影像放大或縮小：微信

   　　 #region -----圖像縮放-----

        //縮放係數
        double scaleFactor = 200;

        //圖像按下鼠標時的縮放x值
        double mouseDownScaleX = 1;

        //圖像按下鼠標時的縮放y值
        double mouseDownScaleY = 1;

        /// <summary>
        /// 縮放圖片
        /// </summary>
        /// <param name="mouseVal">差值</param>
        /// <param name="type">鼠標類型</param>
        /// <param name="isAction">是主動發起仍是關聯操做時被動調用</param>
        private void ScaleImage(double mouseVal, string type, bool isAction = true)
        {
            double stVal = mouseVal / scaleFactor;
            if (type == "wheel")
            {
                mouseVal = mouseVal > 10 ? 10 : mouseVal;
                mouseVal = mouseVal < -10 ? -10 : mouseVal;
                stVal = mouseVal / scaleFactor;
                var st = GetScaleTrans(ToolInkCanvas, 1);
                if (Math.Abs(st.ScaleX + stVal) > 0.2 && Math.Abs(st.ScaleX + stVal) < 5 &&
                    Math.Abs(st.ScaleY + stVal) > 0.2 && Math.Abs(st.ScaleY + stVal) < 5)
                {
                    SetScaleTrans(ToolInkCanvas,
                        st.ScaleX < 0 ? (st.ScaleX - stVal) : (st.ScaleX + stVal),
                        st.ScaleX < 0 ? (st.ScaleX - stVal) : (st.ScaleX + stVal),
                        false, 1);
                }
            }
            else
            {
                stVal = mouseVal / scaleFactor;
                if (Math.Abs(mouseDownScaleX + stVal) > 0.2 && Math.Abs(mouseDownScaleX + stVal) < 5 &&
                    Math.Abs(mouseDownScaleY + stVal) > 0.2 && Math.Abs(mouseDownScaleY + stVal) < 5)
                {
                    SetScaleTrans(ToolInkCanvas,
                        mouseDownScaleX < 0 ? (mouseDownScaleX - stVal) : (mouseDownScaleX + stVal),
                        mouseDownScaleY < 0 ? (mouseDownScaleY - stVal) : (mouseDownScaleY + stVal),
                        false, 1);
                }
                else
                {
                    isMouseDown = false;
                }
            }
            GetRulerValue();

            if (isAction)
            {
                for (int i = 0; i < Cell.MedicalView.SelectedBoxList.Count; i++)
                {
                    var box = Cell.MedicalView.SelectedBoxList[i];
                    if (box != this)
                    {
                        box.ScaleImage(mouseVal, type, false);
                    }
                }
            }

            //縮放全部box和從新設置比例尺
            for (int i = 0; i < Cell.BoxList.Count; i++)
            {
                if (Cell.BoxList[i] != this && (Cell.BoxList[i].ImageAlign == ImageAlignment.Center || Cell.BoxList[i].ImageAlign == ImageAlignment.Parent))
                {
                    Cell.BoxList[i].SetScaleTrans(Cell.BoxList[i].ToolInkCanvas,
                        mouseDownScaleX < 0 ? (mouseDownScaleX - stVal) : (mouseDownScaleX + stVal),
                        mouseDownScaleY < 0 ? (mouseDownScaleY - stVal) : (mouseDownScaleY + stVal),
                        false, 1);
                    Cell.BoxList[i].GetRulerValue();
                }
            }

        }

利用XAML設計器中的變換屬性ScaleTransform設置元素縮放比例：架構

<InkCanvas x:Name="ToolInkCanvas" UseCustomCursor="True" ClipToBounds="False"  MinHeight="50" MinWidth="50" EditingMode="None" Background="{x:Null}"  Margin="1" >
                            <InkCanvas.RenderTransform>
                                <TransformGroup>
                                    <RotateTransform/>
                                    <ScaleTransform/>
                                </TransformGroup>
                            </InkCanvas.RenderTransform>
                        </InkCanvas>

　　　　 /// <summary>
        /// 設置元素比例
        /// </summary>
        /// <param name="ui">元素</param>
        /// <param name="scaleX">x比例</param>
        /// <param name="scaleY">y比例</param>
        /// <param name="isAppend">是否爲追加比例</param>
        /// <param name="index">變換屬性的下標</param>
        public ScaleTransform SetScaleTrans(UIElement ui, double scaleX, double scaleY, bool isAppend, int index = 0)
        {
            TransformGroup tg = ui.RenderTransform as TransformGroup;
            var tgnew = tg.CloneCurrentValue();
            if (tgnew != null)
            {
                ui.RenderTransformOrigin = new Point(0.5, 0.5);
                ScaleTransform st = tgnew.Children[index] as ScaleTransform;
                if (isAppend)
                {
                    st.ScaleX *= scaleX;
                    st.ScaleY *= scaleY;
                }
                else
                {
                    st.ScaleX = scaleX;
                    st.ScaleY = scaleY;
                }
                ui.RenderTransform = tgnew;
                return st;
            }
            return null;
        }