C#开发PACS医学影像处理系统(十六)：2D处理之影像平移和缩放

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作者:乔克灬叔叔

1.平移，利用WPF中控件边距来控制位移：

　　　　 /// <summary>
        /// 平移图像
        /// </summary>
        /// <param name="X">平移X轴距离</param>
        /// <param name="startX">X轴起始位置</param>
        /// <param name="Y">平移Y轴距离</param>
        /// <param name="startY">Y轴起始位置</param>
        /// <param name="isAction">是主动发起还是关联操作时被动调用</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);
                    }
                }
            }

            //平移所有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：

2.影像放大或缩小：

   　　 #region -----图像缩放-----

        //缩放系数
        double scaleFactor = 200;

        //图像按下鼠标时的缩放x值
        double mouseDownScaleX = 1;

        //图像按下鼠标时的缩放y值
        double mouseDownScaleY = 1;

        /// <summary>
        /// 缩放图片
        /// </summary>
        /// <param name="mouseVal">差值</param>
        /// <param name="type">鼠标类型</param>
        /// <param name="isAction">是主动发起还是关联操作时被动调用</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);
                    }
                }
            }

            //缩放所有box和重新设置比例尺
            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设计器中的变换属性ScaleTransform设置元素缩放比例：

<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>
        /// 设置元素比例
        /// </summary>
        /// <param name="ui">元素</param>
        /// <param name="scaleX">x比例</param>
        /// <param name="scaleY">y比例</param>
        /// <param name="isAppend">是否为追加比例</param>
        /// <param name="index">变换属性的下标</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;
        }