# Method GTK2.Gnome2Canvas()->set_pixels_per_unit()

Method set_pixels_per_unit

  ```Gnome2.Canvas`` set_pixels_per_unit(`float` `n`)`

Description

  Sets the zooming factor of a canvas by specifying the number of pixels that correspond to one canvas unit.

  The anchor point for zooming, i.e. the point that stays fixed and all others zoom inwards or outwards from it, depends on whether the canvas is set to center the scrolling region or not. You can contorl this using the set_center_scroll_region() function. If the canvas is set to center the scroll region, then the center of the canvas window is used as the anchor point for zooming. Otherwise, the upper-left corner of the canvas window is used as the anchor point.