3D chart....
lazarus / 39-Graphics

----------------------------------------------------------------------
mpknap · 2018-03-17 18:05

I have a file with 2d graphics. How to make a graph like this 3d. The
first picture is the detection of muons with a webcam. To make it
better, I would like something like a 3d chart. I am writing in
Lazarus Pascal for Windows. I am a beginner and the best code would
interest me

----------------------------------------------------------------------
wp · 2018-03-17 18:16

I don't know of a free 3d-plotting library for Lazarus. What I would
do in your case is to call gnuplot (http://gnuplot.info/) in a
separate process, have it plot to a graphics file and display this
file in my program, similar to the "gnuplotter" in this thread: https:
//forum.lazarus.freepascal.org/index.php/topic,23839.msg253759.html#ms
g253759

To get an idea of the 3d capabilities of gnuplout you should look at
http://gnuplot.sourceforge.net/demo_5.2/pm3d.html.

----------------------------------------------------------------------
mpknap · 2018-03-17 18:45

It looks nice but I would like a 3d graph in image.canvas in my
program...

----------------------------------------------------------------------
wp · 2018-03-17 22:55

Maybe you did not understand: the plot is not in a separate gnuplot
window but integrated into your own program - look at attached
screenshot. What your program has to do is to generate the gnuplot
script from your data, start gnuplot in the background with this
script, catch the output image and load it into a TImage component on
your form.

The only problem is maybe that the plot is static, i.e. you cannot
zoom or change the perspective - well you could invoke gnuplot after
each change, but this certainly will not be a smooth operation.