LuaMarchingSquares

Marching squares is a computer graphics algorithm that generates contours for a two-dimensional scalar field (rectangular array of individual numerical values). Wikipedia

##Example

local data = {
  {1, 1, 1, 1, 1},
  {1, 2, 3, 2, 1},
  {1, 3, 3, 3, 1},
  {1, 2, 3, 2, 1},
  {1, 1, 1, 1, 1},
}
local levels = {1, 1.4, 1.8, 2.2, 2.6}    
luams.getContour(data, levels)

##Based on:

• http://udel.edu/~mm/code/marchingSquares/
• https://github.com/RaumZeit/MarchingSquares.js