GTCO Summagraphics ADB Interface - Users Guide - Manual (Page 23)

Summagraphics 23
Scenario 3: The screen resolutions are X = 80 ppi, Y = 90 ppi. You want a one-to-one
mapping of the screen and tablet.
Use X PixScale = 80, Y PixScale = 90
Scenario 4: Enlarging a tablet image – you want the screen image to be twice the size
of the tablet image.
If the screen resolutions were X = 72 ppi, Y = 72 ppi, use X PixScale = 144, Y PixScale = 144.
Scenario 5: Reducing a tablet image – you want the screen image to be half the size of
the tablet image.
If the screen resolutions were X = 72 ppi, Y – 72 ppi, use X PixScale = 36, Y PixScale = 36.
Scenario 6: You want the entire tablet active area mapped to the screen. In other
words, the viewport covers the entire tablet active area.
Be aware that any time you map two dissimilar objects with each other; the screen image
will be distorted. An example of this is mapping the screen (a rectangle) to a square tablet.
If, however, this is what you want to do, here is how:
Example: Total Pixels of Screen Active Area + Length of Tablet Active Area = PixScale Value
X Axis
Y Axis 512 pixels + 12 inches = 42,666
Round to the next higher whole number = 43 ppi
342 pixels + 12 inches = 28.5
Round to the next higher whole number = 43 ppi
If your screen resolution is specified in pixels per inch (mm): first, multiply the number of
pixels per inch by the screen axis length; then do the above computation.
Offset
The offset is the location of the viewport’s upper left corner. It is measured from the upper
left corner of the tablet active area.
Offset is measured in the selected unit of measure, inches or millimeters. The defaults are
X = 1 inch, Y = 1 inch.