User Guide

FontLab 4
542
The middle delta instruction has 4 arguments: point to move, PPM
0
, PPM
1
(the PPM range in which this instruction works), and the shift distance in
eighths of pixels. In the Program panel this instruction looks like:
MDeltaV 18 <6> 12-14
where 18 is the point index, 6 is the distance to move (in this case - move
up by _ of a pixel. A minus sign in front of the number would indicate a
move down), 12 is PPM
0
, and 14 is PPM
1
. This means that point 18 will be
moved up _ of a pixel when PPM is 12, 13 or 14.
To set a middle delta instruction:
1. Select the Middle Delta tool .
2. In the Options panel select the shift distance, direction and PPM
range:
Shift distance
Delta PPM range
By default the PPM range is equal to the current PPM.
3. Move the cursor to the point at which you want to set the delta
instruction and click the left button.