Zooming and Panning the Model

You can control the geometry model display using following actions:

• Move the model along the screen surface (panning);
• Increase and decrease the model scale (zooming);
• Select the model elements: blocks, edges, vertices;

Majority of these actions may be performed by moving the mouse cursor while left or right mouse button is pressed. For some actions one or more keyboard keys should be pressed before moving the mouse.

We will call the mouse move left or right according to what mouse button has been pressed during the move.

Model view window image control using the mouse gestures

What button is pressed during the move	Action	Cursor shape
Left	Model panning with mouse cursor in the Select mode.
Right	Model panning with mouse cursor in the Insert mode.
Right	Rectangular frame ("rubber rectangle") is displayed on screen and its size changes with mouse movement. When the mouse button is released, objects inside the rectangle are selected.

Mouse movements listed above allow the full control over the zoom level.

Besides that, there are several fixed image settings which may be switched on using the toolbar buttons:

Zoom in -				- Zoom to fit
		|
		Zoom out

In conclusion here is the list of all methods of the image zoom control:

1. Mouse wheel rotation increases the zoom level in front direction or decreases the level with backward direction. Screen position of the model point under the mouse cursor stays intact.
2. After pressing the toolbar Zoom in button you may click by the mouse in the model to increase the zoom level twice, or by moving the mouse with left button pressed you may draw the rectangle on the screen, which will be stretched to occupy the full window when the mouse button is released.
3. Pressing the Zoom out button decreases zoom level twice.
4. Zoom to fit button sets the zoom level necessary to fit the full model into the window.
5. Shortcuts:
   CTRL and + increases the zoom level twice;
   CTRL and - decreases the zoom level twice;
   CTRL and 0 scales the window to fit the full model.

Related Topics:
Control Picture in a 3D View
Zooming the Field Picture