.. index::
   single: Drawings

Drawings
========

IQcad supports multiple drawings open simultaneously, each in its own tab.

.. index::
   single: New Drawing

New Drawing
-----------

Use **File › New Drawing** or press **Ctrl+N**.  A new tab opens with an empty
canvas ready for drawing.

.. index::
   single: Open a Drawing

Open a Drawing
--------------

Use **File › Open…** or press **Ctrl+O**.  IQcad supports two native formats:

- ``.iqz`` — compressed format (gzip-compressed IQML).  This is the **default
  format** for new drawings.
- ``.iqml`` — uncompressed XML-based format.

IQcad auto-detects both formats on open (gzip magic bytes are checked first).
After loading, the view zooms to fit all objects.

.. note::
   IQcad can also open DXF and DWG files (**File › Open…** — select the
   appropriate file-type filter) and import LandXML files
   (**File › Import LandXML…**).

.. index::
   single: Saving

Saving
------

.. list-table::
   :header-rows: 1
   :widths: 30 70

   * - Command
     - Description
   * - **File › Save** (Ctrl+S)
     - Saves to the current file name in IQZ format (compressed) by default.
       The tab title loses the ``*`` modified indicator.
   * - **File › Save As…** (Ctrl+Shift+S)
     - Prompts for a new file name and saves.  The file-type filter lets you
       choose between ``.iqz`` (compressed) and ``.iqml`` (uncompressed).
       Also available from the **Save As** button on the Quick Access Toolbar.

The tab title shows an asterisk (``Drawing1*``) when the drawing has unsaved
changes.

.. index::
   single: Multiple Drawings

Drawing Properties
------------------

**File › Drawing Utilities › Properties…** opens a read-only summary of the
current drawing as a collapsible tree:

- **Entities** --- a count of every entity type in model space.
- **Layers** --- each layer's entity count and its on/off, frozen and locked
  state, colour and linetype.
- **Blocks** --- every block definition, its nested entity count and how many
  times it is inserted.
- **Styles & tables** --- text, dimension, multiline and point styles, and
  linetypes.
- **Civil / 3D** --- surfaces (with TIN point and triangle counts), DEM
  surfaces, alignments (length and element count), corridors, gradings and
  culverts.
- **Model summary** --- total entity count, drawing extents, units and file
  information.

Use **Copy** to place the report on the clipboard, or **Save…** to write it to
a text file.  The same report can be printed to the command line with the
``DWGPROPS`` command.

Multiple Drawings
-----------------

- Each drawing occupies a **tab** above the canvas.
- Click a tab to switch to that drawing.  The Object Inspector, Layer Manager,
  and Civil Toolspace all update to reflect the newly active drawing.
- Close the active drawing with **Window › Close Drawing** (**Ctrl+W**) or by
  clicking the **×** button on the tab.
- If you close the **last open tab**, IQcad automatically opens a fresh empty
  drawing so there is always at least one drawing available.
- If a drawing has unsaved changes, a *Save / Discard / Cancel* prompt appears
  before the tab closes.

.. index::
   single: Drawing Tabs

Drawing Tabs
~~~~~~~~~~~~

.. code-block:: text

   [ Drawing1  × ]  [ Tunnel_A.iqml  × ]  [ Untitled*  × ]  [ + ]

The **+** button at the right end of the tab bar creates a new drawing (same as
**Ctrl+N**).