XYplotx mouse actions

• button 1: zoom-in

  Pressing down button 1 starts a zoom-in operation. Holding button 1 down and moving to new location displays a zoom-in box with endpoints at original location and current location. Releasing button 1 changes axes limits of graph to those of the zoom-in box.

• button 2: restore

  Pressing down button 2 returns axes limits to the original ones.

• button 3: line parameter report

  Pressing down button 3 starts a line-segment operation for reporting slope and intercepts. Holding down, moving, then releasing define a line-segment. After release, a report of the line-parameters of the defined line segment: slope, y-intercept, x-intercept. For a single press and release, only x and y are reported.

• shift-button 3: curve label operation

  Pressing down button 3 with shift held down starts a curve-label operation. Holding down, moving, then releasing defines a line-segment. After release, prompt for text for the label, and whether or not to add an arrow.

• shift-button 1: delete curve label operation

  Pressing down button 3 with shift held down starts a delete curve-label operation. Holding down, moving, then releasing defines a delete box. After release, any markers within the delete box are removed.