apt-get install freeglut3-dev

gcc 'plt_view.c' -lGLU -lGL -lglut -lm

Point in polygon
Line–line intersection

Delete overlapping objects

How to know if a point is inside a circle?
Check if a circle is contained in another circle
Is a circle inside a polygon?

Resize objects

resizing the shape

Vzdálenost bodu od přímky
Normálový vektor přímky

the general form equation of a line from two points

How can I find the general form equation of a line from two points?
Obecná rovnice přímky
Jak určit obecnou rovnici přímky určené dvěma body
Two vectors are in the same direction if?
Scalar Multiplication of Vectors: Definition & Calculations
How to Find the Angle Between Two Vectors
Calculate a point on the line at a specific distance
Funkce cosinus

Distance from a point to a line
Midpoint circle algorithm

An Efficient Way to Draw Approximate Circles in OpenGL

Line Intersecting Circle

How do I calculate the intersection(s) of a straight line and a circle?
Circle line-segment collision detection algorithm?
Intersection of a Line and a Circle
Line Intersecting Circle at Two Points
Circle-Line Intersection
Intersection of circle and a line
Find the Points of Intersection of a Circle with a Line
Circle-Line Intersection

Picking Objects OpenGL

Picking with a physics library
Picking with custom Ray-OBB function
Picking and Using Selection
Picking with an OpenGL hack
Mouse picking with OpenGL
OpenGL Picking Tutorial

Crop objects

Check if a point belongs on a line segment

Load data from file

Vektorový grafický formát HPGL
Vektorový grafický formát DXF

http://lx-viewer.sourceforge.net/download.php

Translate DXF to GCode

https://github.com/SebKuzminsky/pycam

https://sourceforge.net/projects/dxf2gcode/

http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Cam

Image to GCode

http://linuxcnc.org/docs/2.1/html/gui/image-to-gcode/index.html

Python on Windows

https://wiki.python.org/moin/WindowsCompilers#Microsoft_Visual_C.2B-.2B-_10.0_standalone:_Windows_SDK_7.1_.28x86.2C_x64.2C_ia64.29

https://stackoverflow.com/questions/2817869/error-unable-to-find-vcvarsall-bat