/// <summary>
/// 重写鼠标down事件
/// </summary>
/// <param name="sender">事件触发器</param>
/// <param name="e">事件参数</param>
public override void OnMouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
if (m_HookHelper.ActiveView == null)
{
return;
}
//制图模式
else if (m_HookHelper.Hook is IPageLayoutControl)
{
m_PageLayoutControl = m_HookHelper.Hook as IPageLayoutControl;
//画的矩形Extent
IEnvelope trackExtent = m_PageLayoutControl.TrackRectangle();
PIE.Geometry.IEnvelope currentExtent = m_PageLayoutControl.ActiveView.DisplayTransformation.VisibleBounds;
double xMin, yMin, xMax, yMax;
xMin = yMin = xMax = yMax = 0;
m_PageLayoutControl.PageLayout.PageToMapPoint(m_HookHelper.FocusMap, trackExtent.XMin, trackExtent.YMin, ref xMin, ref yMin);
m_PageLayoutControl.PageLayout.PageToMapPoint(m_HookHelper.FocusMap, trackExtent.XMax, trackExtent.YMax, ref xMax, ref yMax);
IEnvelope extent = new Envelope();
extent.PutCoords(xMin, yMin, xMax, yMax);
//计算一个缩放比例
double scale = currentExtent.GetWidth() * 1.00 / (trackExtent as IEnvelope).GetWidth();
//缩放比例与地图模式下的基本一致
extent.Expand(scale * 1.3, scale * 1.3, true);
(m_PageLayoutControl.FocusMap as IActiveView).Extent = extent;
(m_PageLayoutControl.FocusMap as IActiveView).PartialRefresh(ViewDrawPhaseType.ViewAll);
}
//地图模式
else if (m_HookHelper.Hook is IMapControl)
{
m_MapControl = m_HookHelper.Hook as IMapControl;
//画的矩形Extent
IEnvelope trackExtent = m_MapControl.TrackRectangle();
if (trackExtent == null)
{
return;
}
//获取当前的Extent
IEnvelope currentExtent = m_MapControl.Extent;
IEnvelope newExtent = null;
//创建一个新的Extent
double dWidth = currentExtent.GetWidth() * (currentExtent.GetWidth() / trackExtent.GetWidth());
double dHeight = currentExtent.GetHeight() * (currentExtent.GetHeight() / trackExtent.GetHeight());
double dXmin = currentExtent.XMin - ((trackExtent.XMin - currentExtent.XMin) * (currentExtent.GetWidth() / trackExtent.GetWidth()));
double dYmin = currentExtent.YMin - ((trackExtent.YMin - currentExtent.YMin) * (currentExtent.GetHeight() / trackExtent.GetHeight()));
double dXmax = (currentExtent.XMin - ((trackExtent.XMin - currentExtent.XMin) * (currentExtent.GetWidth() / trackExtent.GetWidth()))) + dWidth;
double dYmax = (currentExtent.YMin - ((trackExtent.YMin - currentExtent.YMin) * (currentExtent.GetHeight() / trackExtent.GetHeight()))) + dHeight;
//设置extent coordinate
newExtent = new Envelope();
newExtent.PutCoords(dXmin, dYmin, dXmax, dYmax);
m_MapControl.Extent = newExtent;
m_MapControl.PartialRefresh(ViewDrawPhaseType.ViewAll);
}
}