coffeekumazaki / euler_spiral

The c++ implementation for Euler spiral (clothoid).

Euler Spiral

An Euler spiral (clothoid) is a curve whose curvature changes linearly with its curve length.

This libraly provides two functions.

• calculate the endpoint of Euler spiral at given length with given curveture deviation.

  struct SpiralPoint {
    double x, y, t;
  };
  
  SpiralPoint getEndPoint(double length, double dCurv, double initCurv = 0.0, double initX = 0.0, double initY = 0.0, double initTheta = 0.0);

• estimate suitable parameters for Euler spiral, length, initial curvature and curvature deviation from given two points and directions at them.

  struct SpiralParameter {
    double length;
    double initCurv;
    double dCurv;
  };
  
  SpiralParameter getParameter(const SpiralPoint& start, const SpiralPoint& goal, SpiralParameter* init = NULL);

  <demo>

  

build & run demo

$ mkdir build
$ cd build
$ cmake ../test
$ make

reference

• Euler Spiral for Shape Completion.
  Benjamin B. Kimia, Ilana Frankel, and Ana-Maria Popescu. 2003.
  Int. J. Comput. Vision 54, 1–3 (August-September 2003), 157–180.
  DOI:https://doi.org/10.1023/A:1023713602895

euler_spiral's Issues

License

Thank you for sharing your project.

I would appreciate if you could add a license :)

There is a bug in euler_spiral.cpp !!!!

hello, thank you for your opensource code. solve my question.
however, I found the bug in the process of using.

the origin code:
pos.x = M_PI * a * (x * cos(theta) - y * sin(theta));
pos.y = M_PI * a * (x * sin(theta) + y * cos(theta));
if (dCurv < 0.0) pos.x *= -1.0;

the fix code:
if (dCurv < 0.0) x *= -1.0;
pos.x = M_PI * a * (x * cos(theta) - y * sin(theta));
pos.y = M_PI * a * (x * sin(theta) + y * cos(theta));

because in the paper sign is for the x not the pos.x.

make only output the libeuler_spiral_lib.a file

I executed the command but only get the libeuler_spiral_lib.a. No executable file generated. Could any one teach me the following step to get the plot shown in ReadMe? Thanks very much!