Oasys GSA Documentation

# Zooming and panning

Zooming and panning affect the structure scale and the mid-point. These parameters may be adjusted explicitly via the Orientation settings dialog box. More commonly, though, higher level operations may be used to zoom or pan.

# Zoom cursor mode

When in the zoom cursor mode:

Dragging a rectangle

  • Zooms and pans the rectangle to fill the Graphic window.
  • This is only exact when the aspect ratios of the rectangle and window are identical. Otherwise the scale is such that at least all of the rectangle remains visible.

Click

  • Pans and zooms in. The image is panned and the point clicked on is the mid-point of the view.
  • The structure scale is multiplied by the zoom factor, see: Graphics preferences.

Ctrl+Click

  • Pans and zooms out. The image is panned and the point clicked on is the mid-point of the view.
  • The structure scale is multiplied by 1 / zoom factor, see: Graphics Preferences.

Shft+Click

  • Pans. The image is panned and the point clicked on is the mid-point of the view.

# Rotate cursor mode

Ctrl+Drag

  • Zooms up / down and in / out.
  • Sensitivity is governed by the zoom increment mouse sensitivity Graphics preferences.

Shft+Drag

  • Pans the image.
  • Sensitivity is governed by the pan increment mouse sensitivity Graphics preferences.

# Intellimouse wheel: In any cursor mode

Rolling the mouse wheel

  • Moves forwards / backwards and zooms in / out. Each notch on the mouse wheel is equivalent to one Zoom In or Zoom Out command.
  • When rolling the mouse wheel while the cursor is over the Graphic view then the zoom is pinned at the cursor position.

Drag with the mouse wheel

  • Or middle button held down pans the image. The sensitivity is as for Shift+Drag, under dragging above.

Ctrl+Drag with the mouse wheel

  • Or middle button held down operates as Ctrl+Drag in the rotate cursor mode.

The following commands (and their associated accelerator keys) are available from the Graphics > Orientation and allow zooming and panning.

  • Zoom in (Ctrl+Up): Multiplies the structure scale by (zoom factor), see: Graphics preferences.
  • Zoom out (Ctrl+Dn): Multiplies the structure scale by (1 / zoom factor).
  • Reset pan (Shift+Home): Sets the mid-point to (0, 0, 0).
  • Pan right (Shift+Rt): Adjusts the mid-point to result in the picture shifting left by 1⁄16 of the picture width.
  • Pan left (Shift+Lft): Adjusts the mid-point to result in the picture shifting right by 1⁄16 of the picture width.
  • Pan up (Shift+Up): Adjusts the mid-point to result in the picture shifting down by 1⁄16 of the picture height.
  • Pan down (Shift+Down): Adjusts the mid-point to result in the picture shifting up by 1⁄16 of the picture height.

Note that scaling to fit effectively resets any zooming and panning.

These operations do not affect the object point so, for example, rotations that occur after a zoom or pan may not have the desired affect unless the object point is adjusted.

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