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

阅读原文时间：2020年09月21日阅读：2

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 = ; 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 = ; 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 = ;

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

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

    /// <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 >  ?  : mouseVal;  
            mouseVal = mouseVal < - ? - : mouseVal;  
            stVal = mouseVal / scaleFactor;  
            var st = GetScaleTrans(ToolInkCanvas, );  
            if (Math.Abs(st.ScaleX + stVal) > 0.2 && Math.Abs(st.ScaleX + stVal) <  &&  
                Math.Abs(st.ScaleY + stVal) > 0.2 && Math.Abs(st.ScaleY + stVal) < )  
            {  
                SetScaleTrans(ToolInkCanvas,  
                    st.ScaleX <  ? (st.ScaleX - stVal) : (st.ScaleX + stVal),  
                    st.ScaleX <  ? (st.ScaleX - stVal) : (st.ScaleX + stVal),  
                    false, );  
            }  
        }  
        else  
        {  
            stVal = mouseVal / scaleFactor;  
            if (Math.Abs(mouseDownScaleX + stVal) > 0.2 && Math.Abs(mouseDownScaleX + stVal) <  &&  
                Math.Abs(mouseDownScaleY + stVal) > 0.2 && Math.Abs(mouseDownScaleY + stVal) < )  
            {  
                SetScaleTrans(ToolInkCanvas,  
                    mouseDownScaleX <  ? (mouseDownScaleX - stVal) : (mouseDownScaleX + stVal),  
                    mouseDownScaleY <  ? (mouseDownScaleY - stVal) : (mouseDownScaleY + stVal),  
                    false, );  
            }  
            else  
            {  
                isMouseDown = false;  
            }  
        }  
        GetRulerValue();

        if (isAction)  
        {  
            for (int i = ; 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 = ; 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 <  ? (mouseDownScaleX - stVal) : (mouseDownScaleX + stVal),  
                    mouseDownScaleY <  ? (mouseDownScaleY - stVal) : (mouseDownScaleY + stVal),  
                    false, );  
                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：

　　　　 ///

/// 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 = )
{
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：