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Internal Zooming

GREG has the possibility of zooming a plot being created. Use command ZOOM to do it. ZOOM X1 X2 Y1 Y2 will compute scale factors to match the designed area (in Physical Coordinates) to the screen, preserving the aspect ratio. ZOOM OFF restores the full screen, ZOOM REFRESH redraws the plot with the current zooming factor. Without arguments ZOOM calls the cursor, and several keys can be used to control the zooming factor :

Any other gives you the cursor position. Zooming can be used for example to enlarge part of a complex drawing to make precise annotations. Note that the zooming has no effect on the hardcopy.

On X-Window systems, the zoomed area normally appears in another window. The mouse can be used instead of the keyboard for some actions:


next up previous contents index
Next: GreG Manual Up: GreG CookBook Previous: Raster Devices   Contents   Index
Gildas manager 2020-12-02