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# 2.2.11 Pan/Zoom

This command is used to move or resize the viewport using the mouse or keyboard. Left+Drag Pans the viewport up and down, left and right keping it within the boundaries of the layout. Ctrl+Left-Drag selects an area of the screen to zoom into. The "0" or "o" - key resets the display to the origin but leaves the zoom as is. Keys between 1 and 9 set the zoom to that zoom level. The "e" - key resets the origin to zero and the zooms to show the whole layout.

There is a context menu that contains these text based items as well.

  Zoom/Pan Shortcut Keys

  - Keys '1'-'9' set the zoom to between 1::1 and 1::9.

  - Key 'e' sets the zoom to a value that allows all the room to be shown and moves the origin of the bottomm left of the window to 0,0

  - Key '0' or 'o' keeps the zoom as is, but moves the origin of the bottom left of the window to 0,0

  - Key 'c' moves the center of the window to the cursor position but leaves the zoom alone

As the window is Zoomed in and out, the setting of Constrain Drawing Area to Room Boundaries setting in the Display Section 2.10.3 dialog determines where the zoom is about. If it is not set, the center of the Drawing Area will stay fixed as the zoom changes. Otherwise, position of the Drawing Area will be constraned so any grey area will be to the right or above the room boundaries.