Table of contents

• cljs-polys-etc.polys - Functions for working with polygons in SVG.
  • arc-len-degrees - Returns the length of an arc with given theta (degrees) and radius.
  • arc-len-radians - Returns the length of an arc with given theta (radians) and radius.
  • degrees-to-radians - Converts degrees to radians.
  • difference - Returns a vector of polys that is the difference of two polys.
  • equilateral-height - Returns height of an equilateral triangle with given side length.
  • equilateral-inradius - Returns the inner radius of an equilateral triangle with given side length.
  • equilateral-sidelen - Returns the side length of an equilateral triangle with given height.
  • intersection - Returns a vector of polys that is the intersection of two polys.
  • polar-to-cartesian - Converts a point in polar space to cartesian space.
  • poly2path - Converts a poly into a string suitable for using in an SVG :polygon's :point attribute.
  • rotate-point - Rotates a point around [0,0] by given degrees.
  • rotate-poly - Rotates all points in poly around [0,0] by given degrees.
  • sqrt3
  • translate-point - Translates a point by xd, yd.
  • translate-poly - Translates all points in a poly by xd, yd.
  • translate-polys - Translates all polys in a vector of polys.
  • union - Returns a vector of polys that is the union of two polys.

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cljs-polys-etc.polys

Functions for working with polygons in SVG. This library requires polybooljs to work.

The notion of a polygon here is just a vector of points in cartesian space, e.g.

(def a-square [[0 0] [10 0] [10 10] [0 10]])

The polybooljs library has a more complex idea of what a polygon is [<https://sean.cm/a/polygon-clipping-pt2], which means a vector of with multiple regions and an inverted? flag. Cljs-polys-etc is not that complex (yet). The inverted? tag remains unimplemented.

arc-len-degrees

(arc-len-degrees theta radius)

Returns the length of an arc with given theta (degrees) and radius.

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arc-len-radians

(arc-len-radians theta radius)

Returns the length of an arc with given theta (radians) and radius.

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degrees-to-radians

(degrees-to-radians degrees)

Converts degrees to radians. 0 radians usually 'point right' and the resulting degrees will also have 0 'pointing right.'

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difference

(difference poly1 poly2)

Returns a vector of polys that is the difference of two polys.

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equilateral-height

(equilateral-height sidelen)

Returns height of an equilateral triangle with given side length.

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equilateral-inradius

(equilateral-inradius sidelen)

Returns the inner radius of an equilateral triangle with given side length.

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equilateral-sidelen

(equilateral-sidelen height)

Returns the side length of an equilateral triangle with given height.

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intersection

(intersection poly1 poly2)

Returns a vector of polys that is the intersection of two polys.

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polar-to-cartesian

(polar-to-cartesian cx cy radius degrees)

Converts a point in polar space to cartesian space.

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poly2path

(poly2path poly)

Converts a poly into a string suitable for using in an SVG :polygon's :point attribute.

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rotate-point

(rotate-point [x y] degrees)

Rotates a point around [0,0] by given degrees.

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rotate-poly

(rotate-poly poly degrees)

Rotates all points in poly around [0,0] by given degrees.

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sqrt3

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translate-point

(translate-point [x y] xd yd)

Translates a point by xd, yd.

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translate-poly

(translate-poly poly xd yd)

Translates all points in a poly by xd, yd.

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translate-polys

(translate-polys polys x y)

Translates all polys in a vector of polys.

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union

(union poly1 poly2)

Returns a vector of polys that is the union of two polys.

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