Chapter 12 On-Screen Measurement148Adding Annotationsand Measuring12.2.2 Measuring Length of a Perpendicular LineYou can measure length of a perpendicular line drawn from a point to a reference line drawn between two points on animage.1 Display the toolbar.2 Press the [COLOR] button to select color ofmeasurement results.3 Press the [PERPENDICULAR MEASUREMENT] button.A blue frame appears around the button.4 Specify two arbitrary points (A and B on the figure) todraw a reference line for measurement.5 Specify an arbitrary point (C in the figure) from whichyou want to measure distance to the reference line.If you specify the point, a perpendicular line is drawn fromthe point to the reference line and its distance is shown.6 Repeat step 5 to continue measuring anotherperpendicular line from the same reference line.7 To display or hide the measured result, switch todisplay or hide overlay.You cannot selectively display or hide only the measuredresult. Switch to display or hide the entire overlay.8 To end measurement, press the [PERPENDICULARMEASUREMENT] button to deselect the tool.Measuring Distance from Reference LineUndoing and redoing measurementYou can cancel and redo measurement by pressing the [UNDO MEASUREMENT] or [REDO MEASUREMENT]button respectively.Measurement result display• If the setting of calibration is changed, all measured results are cleared.• The line width and character size of measurement result can be changed on the [TOOL SET: MAIN] screen.• When stylus operation is not easy or accurate positioning is required, mouse operation is recommended. Use acommercially available USB mouse for operation.3, 845217
