ZoomIn Command
From GeoGebra Manual
- ZoomIn( <Scale Factor> )
- Zooms the Graphics View in by given factor with respect to current zoom, center of the screen is used as center point for the zoom.
- Example:
ZoomIn(1)
doesn't change the view, but does remove tracesZoomIn(2)
zooms the view inZoomIn(0.5)
is equivalent toZoomOut(2)
, i.e. it zooms the view out.
- ZoomIn( <Scale Factor>, <Center Point> )
- Zooms the Graphics View in by given factor with respect to current zoom, second parameter specifies center point for the zoom.
- Example:
ZoomIn(2, (0, 0))
- ZoomIn( <Min x>, <Min y>, <Max x>, <Max y> )
- Zooms the graphics view to the rectangle given by vertices (Min x, Min y), (Max x, Max y).
- Example:
ZoomIn(0, 1, 5, 6)
- Note: If any of these parameters are dependent or has label set, the bounds of the view become dynamic. To avoid this behaviour, use CopyFreeObject Command.
- Example:If a is a slider,
ZoomIn(-a, -a, a, a)
makes the zoom of the view dependent on slider a.
Notes:
- If multiple Graphics Views are present, the active one is used
- See also ZoomOut, SetActiveView, Pan commands.
Comments
Idea of Use[edit]
Linear aproximation of a function by its tangent[edit]
Create a function f with a point A on it and a button with the code ZoomIn(2,A)
to see that the function looks equal to the tangent for a big "magnification". Another button with ZoomOut let you be able to prove this at other positions of the point A.