Notice that you can press (and hold) the
‘H’ or ‘V’ key to spin
the object horizontally or vertically.
Close that sample application,
but leave the C++ project open,
and take a look at the try.cpp file.
The program you just ran, which is uncommented in try.cpp,
is called paramsurf.cpp.
Now comment out that line, and type (or copy/paste)
this line into try.cpp:
 |
#include "HANDBOOK/circumcircle.cpp"
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The book (top of page 10, Step 4) says this line is already
in the try.cpp file.
But this line is no longer in the file, and if you
search for that string as instructed in the book
you will not find it. Instead, simply type it
into try.cpp, or copy/paste it from above.
Now you are ready to proceed with the book's
first tutorial, beginning with Step 5 on page 10.
Build and execute the program, and an
application window should appear
with this graphic:
Close that application window, and open this file in the
MSVC++ 6.0 project:
|
C:\Program Files\OpenGeometry\OpenGeometry2.0\HANDBOOK\circumcircle.cpp
|
As instructed in the book, add a fourth point M to the list of points:
|
P2d A, B, C, M;
|
Insert the following line as the last line in Scene::Init( ):
|
M = CircumCircle.GetCenter( );
|
And insert this line at the end of Scene::Draw( ):
|
M.Mark( Gray, 0.15, 0.1 );
|
Then build and execute the program, and the graphic
should appear showing the center of the circle:
The next example (page 10, Section C) animates that window.
Close the graphic application window from the last example,
comment out its include statement in try.cpp,
and copy/paste this line into try.cpp:
|
#include "HANDBOOK/circumference.cpp"
|
Build and execute the program, and in the graphic
application window click on the animation (rotation)
button:
Open Geometry includes html help as class header listings:
|
C:\Program Files\OpenGeometry\OpenGeometry2.0\oghelp.html
|
For more information
look up individual functions in the book's index.
Some images on our web site were
created with Open Geometry, and have a link for you
to download the source code (.cpp file)
that was used to create the image.
You can rotate those images by pressing
the ‘H’ or ‘V’ keys
(or using the Open Geometry's toolbar buttons).
To run an Open Geometry file from our
web site, download the file and then
create an #include
statement for it in try.cpp (as described
above for circumcircle and circumference).
Make sure only one application file
#include statement is
uncommented at a time in try.cpp.
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