Graphic Display Management

View is a combination of the size, position and orientation of a drawing fragment on the screen.

There are different tools and methods allowing you to orient in the document when you edit it. You can zoom or pan the working area for visual control of changes in the document; you can save a selected view for further display or printing; you can separate the working area of a document into several non-overlapping viewports to display different drawing fragments at the same time.

The VISIBLESCENEDEPTH system variable controls the method for determining the depth occupied by objects in the visible part of the scene:

·          0 – uses the overall scene depth without calculating the boundaries of visible objects, ensuring maximum performance;

·          1 – performs a fast calculation by transforming the combined boundary of visible block objects into the local coordinate system;

·          2 – provides an accurate, but resource-intensive, calculation by summing the boundaries of visible block objects transformed into the local coordinate system.

The optimal value for the VISIBLESCENEDEPTH system variable depends on the specifics of the drawing: 2 is recommended for accurate visualization; 1 is recommended for drawings with a large number of nested objects or blocks with many parts; and 0 is used for improved performance (the default mode). Changes to the variable’s value are saved in the current drawing.

Display Modes

The main methods to change the document display on the screen are zooming and panning.

Zoom command enlarges the view of a drawing segment for better detailing or decreases it to display more of the drawing. Absolute sizes are not changed during zooming.

Pan command allows you to pan the drawing without decreasing or enlarging it.

Zoom and Pan commands are available in the View – Zoom menu or on the Zoom toolbar. For your convenience, most frequently used commands are on the Main toolbar and in the status bar.

For more convenience, the most often used commands are also available in the Main toolbar and in the status bar.

Pan Command

        Ribbon: View – Navigate >  Pan

       Menu: View – Zoom >  Pan

       Toolbar: Main –

       Status bar –

 Command line: PAN, VIEWPAN

The mode to pan the image, occurs when you move the cursor with pressed left button, the image is moved dynamically to horizontal, vertical and diagonal directions. The scale of the document is not changed.

After starting the command, the cursor has the shape.

With the left button pressed, the cursor has the  shape. In a perspective projection, the center relative to which the movement will be carried out is highlighted with a colored icon - a blue sphere .

To exit from pan mode, press the ESC or ENTER buttons.

Zoom

       Status bar –  Navigate

 Command line: ZOOM, Z

Turns on the mode in which you can increase an object’s size on the screen by moving the mouse up and decrease it by moving it down. All available options are displayed in the command line:

Specify corner of window or
[All/Center/Dynamic/Extents /Scale/RScale/Window/Object] <real time>:

Realtime

        Ribbon: View – Navigate >  Realtime

        Menu: View – Navigation >  Zoom realtime

        Toolbars: Main, Navigate –

        Status Bar –

 Command line: ZOOMD, VIEWZOOMDYNAMIC

Turns on the interactive image zooming mode, in which moving the mouse cursor with the left button pressed and held up the screen enlarges the view on the screen, and moving downward – reduces it.

After starting the command from the View menu or the Main toolbar, the cursor looks as follows: .

Releasing the mouse button suspends the zoom, you can move the cursor to a different position, and then click again to continue zooming in the new position.

To exit the zoom mode, press ESC or ENTER.

Window

        Ribbon: View – Navigate >  Window

        Menu: View – Navigation >  Zoom Window

        Toolbars: Main, Zoom –

        Status bar –

 Command line: ZOOMW

Sets the display area of the document by specifying two opposite corners of a rectangular frame.

In the process of specifying, for precise positioning of the window, it is convenient to use a one-time object snap from the context menu calling it by clicking the right mouse button while holding CTRL (or SHIFT).

Scale

        Ribbon: View – Navigate >  Scale

        Menu: View – Navigation >  Zoom scale

        Toolbar: Zoom –

Changes the scale (zoom rate) of a document by specifying the exact scale factor.

The screen image is enlarged or reduced by a specified value relative to the specified document limits.

Zoom 1:1

        Ribbon: View – Navigate >  Zoom 1:1

       Menu: View – Navigation >  Zoom 1:1

 Toolbar: Zoom –

 Command line: ZOOM1, VIEWZOOM1X1

An image is scaled so that one pixel on the screen corresponds to one image point according to the specified DPI value.

Zoom Center

        Ribbon: View – Navigate >  Center

        Menu: View – Navigation >  Zoom Center

        Toolbar: Zoom –

Displays image in the center in the specified point with given scaling coefficient or height.

Command prompts:

Specify center point:

Enter magnification or height <200.00>:

First specify the point that will be the center of zoomed fragment, and then set magnification or height. One can enter numeric value in the command line or determine height by specifying two points on the screen.

Setting height value less than current one leads to image increase. Setting larger value results in image reduction.

Zoom All

        Ribbon: View – Navigate >  Zoom All

       Menu: View – Navigation >  Zoom All

       Toolbar: Main, Zoom –

       Status bar:

 Hotkeys: ALT+0

 Command line: ZOOMALL, VIEWZOOMALL

Displays the whole document, even if some objects are outside the specified limits.

Zoom Selected

        Ribbon: View – Navigate >  Zoom Object

       Menu: View – Navigation >  Zoom Selected

       Toolbar: Main, Zoom –

 Command line: FITSEL, FITSELECTED

Displays the selected objects.

Zoom In

        Ribbon: View – Navigate >  Zoom In

       Menu: View – NAvigation >  Zoom In

 Toolbar: Zoom –

 Command line: ZOOMIN

Doubles the scale.

Zoom Out

        Ribbon: View – Navigate >  Zoom Out

       Menu: View – Navigation >  Zoom Out

 Toolbar: Zoom –

 Command line: ZOOMOUT

Decreases the scale by half.

Extents

        Ribbon: View – Navigate >  Extents

        Menu: View – Navigation >  Zoom Extents

        Toolbar: Zoom –

Displays the entire document on the screen within its extents.

In this mode of displaying a document (in contrast to the All option), the boundaries of the set document limits are not taken into account.

Previous

        Ribbon: View – Navigate >  Previous

        Menu: View – Navigation >  Zoom Previous

        Toolbar: Zoom –

Sequential display of previous views on the screen.