uk.ac.starlink.ttools.plot2.task
Class PointSelectionEvent
java.lang.Object
java.util.EventObject
uk.ac.starlink.ttools.plot2.task.PointSelectionEvent
- All Implemented Interfaces:
- Serializable
public class PointSelectionEvent
- extends EventObject
Describes the result of an attempt to select a data point on a plot.
This is usually the result of a user click action.
- Since:
- 21 Nov 2014
- Author:
- Mark Taylor
- See Also:
- Serialized Form
Method Summary |
long[] |
getClosestRows()
Returns an array of row indices, one for each plotted layer. |
Point |
getPoint()
Returns the point indicated by the user. |
PointSelectionEvent
public PointSelectionEvent(Object source,
Point point,
long[] closestRows)
- Constructor.
- Parameters:
source
- event sourcepoint
- point indicated by the userclosestRows
- array of dataset row index for each plotted layer
getPoint
public Point getPoint()
- Returns the point indicated by the user.
- Returns:
- indicated point
getClosestRows
public long[] getClosestRows()
- Returns an array of row indices, one for each plotted layer.
Each element contains the index of of the data point plotted
in the corresponding
PlotLayer
closest to the indicated graphics position.
If that layer contains no data point within a few pixels of the
given position, the corresponding value is -1.
For layers without data positions, the corresponding value is
always -1.
The close-enough threshold for a point to be included is
given by PlotUtil.NEAR_PIXELS
(4.0).
Note the event may represent no successful selections
(all elements of the returned array equal to -1).
- Returns:
- array of data point indices, one for each plotted layer
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