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Last Update:
July,
2008
The QCad Libraries
The QCad Libraries are a set of C++ libraries to be used with
Qt
for CAD related applications.
Programming With The QCad Libraries
Programming with the QCad libraries is as simple as demonstrated in this
example code snippet which creates a graphic and loads a DXF file into
it. The graphic is then shown in a Qt widget with scrollbars.
// Create graphic document:
RS_Graphic* graphic = new RS_Graphic();
// Import DXF file:
RS_Import import(*graphic);
import.fileImport("demo.dxf");
// Create graphic view (Qt widget):
QG_GraphicView* graphicView =
new QG_GraphicView(this);
graphicView->setContainer(graphic);
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QCad Libraries Modules
QCad is based on these modules:
- dxflib
- qcadlib
- qcadcmd
- qcadactions
- qcadguiqt
- qcadprof
- qcadscripting
These modules are used by the QCad application they can also be used by any
other CAD related program to render and modify 2D CAD drawings.
Note that the QCad application itself is also included as source code in
the QCad Libraries packages.
The figure below shows how the modules interact with each other.
Module overview of the QCad Libraries.
A simple example: The user clicks into the graphic window to
specify the start point of a line. The graphic view widget in the
qcadguiqt module receives the mouse click event and forwards it to
the qcadlib module. The qcadlib module knows that the currently active
action is for drawing lines. The click event is forwarded to the
appropriate action class in the qcadactions module.
dxflib
DXF parsing and writing. dxflib is also available as a single module. For more
information about that, please click here.
Requirements: No special requirements.
qcadlib
2D CAD engine. Rendering, import, export, entity creation, entity modification,
layer handling, block handling, undo/redo functionality, graphics information,
abstract GUI, maths.
Requirements: Qt library, dxflib
qcadcmd
This module contains the handling of all commands used from the command line of
an application. The module is separated to allow individual languages for the
user interface and the commands.
Requirements: Qt library, dxflib, qcadlib
qcadactions
Interactive action classes for qcadlib.
Handling of user events and inputs for creating, modifying and measuring
entities. Interactive zooming, layer handling, block handling, snapping,
selecting.
Requirements: Qt library, dxflib, qcadlib, qcadcmd
qcadguiqt
GUI implementation of common Qt widgets for use with a CAD or CAD related
application. E.g. a graphic view widget, combo boxes for selecting
entity attributes, dialogs, ..
Requirements: Qt library, dxflib, qcadlib, qcadcmd, qcadactions
qcadprof
Classes and functions that are only available for QCad Professional
(e.g. polyline support).
Requirements: Qt library, dxflib, qcadlib, qcadcmd, qcadactions, qcadguiqt
qcadscripting
Scripting support for QCad. This module exposes some C++ functions and
classes to the script interface.
Requirements: Qt library, QSA, dxflib, qcadlib, qcadcmd, qcadactions, qcadguiqt
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