Last Update: August, 2010

Getting Started with qcadlib

Brief introduction for developers who intend to use qcadlib either for QCAD development or development of other CAD related applications.

Compiling the Examples

The following examples come with all the necessary source-files and project files to compile them.

Downloading the QCAD Libraries

Before you start, you need to download and compile the QCAD libraries. The easiest way to do this is to download the QCAD community edition and compile it. This will automatically also build the libraries.

In the following sections I assume that you have successfully downloaded and compiled the libraries into $HOME/qcad2

Installing the QCAD Libraries

The example applications need to be able to find the libraries and header files which are currently in the lib and include directories under $HOME/qcad2. I recommend to install them into $HOME/local/lib and $HOME/local/include which can be done automatically using the standard makefiles:

cd $HOME/qcad2/dxflib make install cd $HOME/qcad2/qcadlib make install cd $HOME/qcad2/qcadcmd make install cd $HOME/qcad2/qcadactions make install cd $HOME/qcad2/qcadquiqt make install # if available / needed: cd $HOME/qcad2/qcadprof make install cd $HOME/qcad2/qcadscripting make install

Now your system should be ready to compile the examples from below:

> qmake example01.pro > make g++ -c -pipe -Wall -W -g -I/opt/qt/mkspecs/linux-g++ -I. -I/home/andrew/local/include -I/opt/qt/include -I.moc/ -o .obj/main.o main.cpp g++ -o example01 .obj/main.o -Wl,-rpath,/opt/qt/lib -L/opt/qt/lib -L/usr/X11R6/lib -L/home/andrew/local/lib -lqcad -lqcadguiqt -ldxf -lqcadguiqt -lqcad -ldxf -lqt -lXext -lX11 -lm

..and run them:

> ./example01 Line: (10/20/0/50/100/0)

Example 1: Creating a Graphic

This simple example creates a graphic with one line in it.

#include "qcadlib/rs_graphic.h" #include "qcadlib/rs_line.h" /** * Main. */ int main() { // create a new empty graphic RS_Graphic* graphic = new RS_Graphic(); // create a line from 10/20 to 50/100 RS_LineData data(RS_Vector(10.0, 20.0), RS_Vector(50.0, 100.0)); RS_Line* line = new RS_Line(graphic, data); // add the line to the graphic graphic->addEntity(line); // stream line information to stdout std::cout << *line; // delete the graphic (this deletes also the line in it) delete graphic; }

Download Sources

main.cpp | example01.pro

Example 2: Creating a Graphic View

This simple example creates a graphicview to display the line from example 1 in it.

#include "rs_graphicview.h" #include "rs_graphic.h" #include "rs_line.h" #include "qg_graphicview.h" #include <qapplication.h> #include <qmainwindow.h> /** * Main. */ int main(int argc, char** argv) { // create a new empty graphic RS_Graphic* graphic = new RS_Graphic(); // create a line from 10/20 to 50/100 RS_LineData data(RS_Vector(10.0, 20.0), RS_Vector(50.0, 100.0)); RS_Line* line = new RS_Line(graphic, data); line->setPen(RS_Pen(RS_Color(255,0,0), RS2::Width12, RS2::SolidLine)); // add the line to the graphic graphic->addEntity(line); // create the Qt application and main window QApplication app(argc, argv); // create a graphic view as a mini-application: QG_GraphicView graphicView; graphicView.setContainer(graphic); graphicView.setCaption("QCAD - Example 2"); app.setMainWidget(&graphicView); app.connect(&app, SIGNAL(lastWindowClosed()), &app, SLOT(quit())); graphicView.show(); return app.exec(); }

Download Sources

main.cpp | example02.pro