Project not maintained

This project will no longer be updated, if you need a Lua library for polygons you can use PolyMan which will be more suitable.

GeoMan

GeoMan is a geometry library written in Lua that allows you to generate shapes, do collision tests, cut concave shapes into convex shapes and get lots of other useful data.

Why did I do this ?

I started this project from that of AlexarJING and I gradually added features until giving this library.

Other mentions

I also included the library polypartition originally written by ivanfratric then rewritten by apicici in MoonScript for his program pathfun-editor.

There is also a Lua rewrite of the simplify-js module to simplify polygons. I published the Lua port alone here.

List of functions

ellipse                 (x,y,rx,ry,seg)
circle                  (x,y,s,seg)
hexagon	                (x,y,r)
lozenge                 (x,y,w,h)
random                  (count, size)
keepMidPoints           (points, keepOlds)
getSegDist              (x,y, x1,y1,x2,y2)
simplifyPoly            (points, tolerance, highestQuality)
getPolyArea    	        (verts)
getPolyDimensions       (verts)
getPolyLength           (verts, isLine)
convexHull              (verts)
concaveHull             (verts)
translate   	        (x,y, rot, size, verts)
newTranslated           (x,y, rot, size, verts)
getMiddle               (x1,y1, x2,y2)
getDist                 (x1,y1, x2,y2)
getAngle                (x1,y1, x2,y2, toggle)
setPolyPosition         (points, x,y, isCenter)
isPolySelfIntersect     (verts)
isPolysIntersect_AABB   (verts1, verts2)
isPolysIntersect        (verts1, verts2)
isPolyInPoly            (verts1, verts2, entirely)
isPointInPoly           (x,y, verts)
isCircleInPoly          (x,y,r, verts, isOut)
isCircleOutPoly         (x,y,r, verts)
isCircleInCircle        (x1,y1,r1, x2,y2,r2, repos)
isCircleOutCircle       (x1,y1,r1, x2,y2,r2, repos)
isTrisIntersect         (tri1, tri2)
isPointInTri            (x,y, triangle)
getPolysSharedEdges     (verts1, verts2)
isPolysAdjacents,       (verts1, verts2, getAdj, round_v)
getTriArea              (triangle)
getTriCenter            (triangle)
getAdjacentTris         (index, triangles)
isBetween               (x,y, x1,y1,x2,y2)
linesIntersect          (x1,y1,x2,y2, x3,y3,x4,y4)
isSegmentsOverlap       (x1,y1,x2,y2,x3,y3,x4,y4)
nearestPoint            (x,y, points)
lineCross               (x1,y1,x2,y2, x3,y3,x4,y4)
polybool                (p1,p2, operator, getMostVerts)
convexpart              (verts)