VC++开发GIS系统（269）修改注释属性之类的设计及实现

本文为修改注释的属性的操作设计一个类，以实现注释属性的相关操作。

类的定义

在_malaLabel.h中定义修改注释属性的类，代码如下：

/*
* 修改注释参数
*/
class malalabeldll  CmalaLabelsModify :public CmalaMouseAction
{
public:
    CmalaLabelsModify(CView* mView, malaScreen *pScreen, CString &fileFullPath);
    ~CmalaLabelsModify();
    void LButtonDown(UINT nFlags, malaPoint point);
    void LButtonUp(UINT nFlags, malaPoint point);
    void MouseMove(UINT nFlags, malaPoint point);
private:
    bool m_Selected;
    malaPoint m_Point;//选择的点
    malaPointPro m_PointPro;//选择的点的属性
    malaLabelPro m_LabelPro;//选择的注释的属性
    CmalaLabelsSelect m_SelectPnt;

    CString mPath;//文件路径
    malaScreen *m_Screen;
};

• m_Selected 用来定义注释是否被选中
• m_Point 记录选择的注释坐标
• m_LabelPro 记录选择注释的属性
• m_PointPro 记录绘制属性坐标点的属性
• m_SelectPnt 一个选择注释对象，用来选择注释
• *m_Screen 屏幕坐标变换变量
• mPath 文件路径

类的实现

在_malaLabel.cpp中实现上述类，代码如下：

/*
* 修改注释参数实现
*/
CmalaLabelsModify::CmalaLabelsModify(CView* mView, malaScreen *pScreen, CString &fileFullPath)
{
    mBaseView = mView;
    mPath = fileFullPath;
    m_Screen = pScreen;
    CmalaLabelsSelect obj(mView, pScreen, fileFullPath);
    m_SelectPnt = obj;
    m_Selected = FALSE;
}

CmalaLabelsModify::~CmalaLabelsModify()
{

}

void CmalaLabelsModify::LButtonDown(UINT nFlags, malaPoint point)
{
    if (!m_Selected)
        m_SelectPnt.LButtonDown(nFlags, point);
}

void CmalaLabelsModify::LButtonUp(UINT nFlags, malaPoint point)
{
    if (!m_Selected)
        m_SelectPnt.LButtonUp(nFlags, point);

    m_Selected = m_SelectPnt.m_Selected;
    if (m_Selected)
    {
        this->m_Point = m_SelectPnt.m_pnt;
        this->m_LabelPro = m_SelectPnt.mLablePro;

        if (dlgModifyLabelPro(m_LabelPro))
        {
            CLabelIO pio;
            pio.labelUpdate(m_Point, m_LabelPro, mPath);
            mBaseView->Invalidate(TRUE);
        }

        m_Point.x = m_Point.y = 0;
        m_Selected = FALSE;
        m_SelectPnt.m_Selected = FALSE;
    }

}

void CmalaLabelsModify::MouseMove(UINT nFlags, malaPoint point)
{
    if (!m_Selected)
        m_SelectPnt.MouseMove(nFlags, point);
}

通过调用 labelUpdate函数实现注释文件属性的修改，可以参考文章《VC++开发GIS系统（263）更新注释参数》

详细代码可以参考：GitHub