/// <summary>
/// Reaction of ROI objects to the 'mouse button down' event: changing
/// the shape of the ROI and adding it to the ROIList if it is a 'seed'
/// ROI.
/// </summary>
/// <param name="imgX">x coordinate of mouse event</param>
/// <param name="imgY">y coordinate of mouse event</param>
/// <returns></returns>
public int MouseDownAction(double imgX, double imgY)
{
int idxROI = -1;
double max = 10000, dist;
//maximal shortest distance to one of
//the handles
//选中范围=ROI方格中心线长
double epsilon = RoiDrawConfig.PaneWidth * Math.Sqrt(2);
//选中范围缩小到10，并按缩放比例自动调整，最低Math.Sqrt(15)
//if (epsilon < Math.Sqrt(15)) epsilon = Math.Sqrt(15);
if (ROI != null) //either a new ROI object is created
{
ROI.CreateROI(imgX, imgY);
ROIList.Add(ROI);
ROI = null;
ActiveROIidx = ROIList.Count - 1;
viewController.Repaint();
}
else if (ROIList.Count > 0) // ... or an existing one is manipulated
{
//判断是否点击已被选中的ROI
if (ActiveROIidx != -1)
{
dist = ROIList[ActiveROIidx].DistToClosestHandle(imgX, imgY);
if ((dist < max) && (dist < epsilon))
{
return(ActiveROIidx);
}
}
//扫描全部，改为倒序扫描
ActiveROIidx = -1;
//for (int i = 0; i < ROIList.Count; i++)
for (int i = ROIList.Count - 1; i >= 0; i--)
{
dist = ROIList[i].DistToClosestHandle(imgX, imgY);
if ((dist < max) && (dist < epsilon))
{
max = dist;
idxROI = i;
}
}//end of for
if (idxROI >= 0)
{
ActiveROIidx = idxROI;
}
viewController.Repaint();
}
return(ActiveROIidx);
}
