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

1.平移，利用WPF中控件边距来控制位移：

　　　　 /// 

        /// 平移图像
        /// 
        /// 平移X轴距离
        /// X轴起始位置
        /// 平移Y轴距离
        /// Y轴起始位置
        /// 是主动发起还是关联操作时被动调用
        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;

        /// 

        /// 缩放图片
        /// 
        /// 差值
        /// 鼠标类型
        /// 是主动发起还是关联操作时被动调用
        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>

　　　　 /// 

        /// 设置元素比例
        /// 
        /// 元素
        /// x比例
        /// y比例
        /// 是否为追加比例
        /// 变换属性的下标
        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;
        }

看效果：