Xmgr: point operations

## Point operations

Operations in Point operations use the pointer to query sets about points, delete points in a set, and move points. In all cases where interaction is required, pressing the right mouse button with the pointer in the drawing area cancels the operation.

- Find points
- Tracker
- Delete
- Add
- Move
- Move X only
- Move Y only
- Distance, dx, dy, angle
- Goto
- Digitize

### Find points

Report on a point in a set

Click on Find points.

Position the pointer close to the data point to identify.

Press the left mouse button.

The set, the location in the set, and (X, Y) for the datum nearest to the pointer will be displayed in a popup. Press the right mouse button to shut off the Find point feature.

### Tracker

Track points in a set.

Visit each point of a set in a sequential manner. Click nearest the set to track, and use the left mouse button to go forward through the set and the middle mouse button to go backwards through the set. The right mouse button exits tracking.

### Delete points

Press Delete point with the left mouse button to activate.

Position the pointer close to the data point to delete.

Press the left mouse button.

### Add points

Add points to a set. Select the set and press Add points to append points to the selected set by clicking on the location where the point is desired. This can be used to (crudely) digitize data from pages pasted on the screen.

### Move points

Press Move with the left mouse button to activate.

Position the pointer close to the data point to move.

Press the left mouse button.

Move the pointer to the new location and press the left mouse button again to register the point's new location.

### Move X only

Click on Move X only to activate.

Position the pointer close to the data point to move.

Press the left mouse button.

Move the pointer to the new location and press the left mouse button again to register the point's new location.

### Move Y only

Click on Move Y only to activate.

Position the pointer close to the data point to move.

Press the left mouse button.

Move the pointer to the new location and press the left mouse button again to register the point's new location.

### Distance, dy/dx, angle

Click on Distance, dy/dx, angle to activate.

Position the pointer close to the starting point. Press the left mouse button. Click again at another point to form a straight line. The results are the distance, slope, and the angle from horizontal.

### Goto

Enter the X, Y of the point to go to, and press Goto point to have the pointer warp to that position on the drawing area.