polygon Class Reference

polygon, vertices in CCW order More...

#include <angelcad.h>

Inheritance diagram for polygon:

Public Member Functions
	polygon (const pos2d@ p1, const pos2d@ p2, const pos2d@ p3)
	Create triangular polygon, points must be given in CCW order. More...
	polygon (const pos2d@ p1, const pos2d@ p2, const pos2d@ p3, const pos2d@ p4)
	Create quadrilateral polygon, points must be given in CCW order. More...
	polygon (const pos2d@ p1, const pos2d@ p2, const pos2d@ p3, const pos2d@ p4, const pos2d@ p5)
	Create 5-sided polygon, points must be given in CCW order. More...
	polygon (const spline2d@ spline, uint nseg=30)
	Create polygon from spline curve and number of straight segments, points must be given in CCW order. More...
	polygon (double r, uint np)
	Create a circular polygon from a radius and np points. More...
	polygon (array< pos2d@>@ points, bool check=true)
	Create a polygon from an array of points. More...
double	area () const
	Polygon area. More...
double	signed_area () const
	Signed polygon area, return negative area for polygons oriented CW. More...
pos2d@	vertex (uint iv) const
	Return polygon vertex from zero based vertex index iv. More...
uint	size () const
	number of polygon points More...
Public Member Functions inherited from shape2d
shape2d@	opAdd (shape2d@ b)
	Boolean union operator+ overload. More...
shape2d@	opAnd (shape2d@ b)
	Boolean intersection operator& overload. More...
shape2d@	opMul (tmatrix@ matrix)
	Transform object by matrix multiplication: shape2d@ o2 = T * o1. More...
shape2d@	opSub (shape2d@ b)
	Boolean difference operator- overload. More...
Public Member Functions inherited from shape
boundingbox@	box () const
	Return bounding box of object. More...
tmatrix@	transform () const
	Return transformation matrix of object. More...
void	write_csg (string path)
	Write object to OpenSCAD .csg file. More...
void	write_xcsg (string path, double secant_tolerance=- 1.0)
	Write object to .xcsg file for processing by xcsg program. More...

Detailed Description

polygon, vertices in CCW order

a polygon is a 2d object. It is defined by vertex positions listed in CCW sequence.

Constructor & Destructor Documentation

polygon() [1/6]

polygon::polygon	(	const pos2d@	p1,
		const pos2d@	p2,
		const pos2d@	p3
	)

Create triangular polygon, points must be given in CCW order.

Parameters

p1	pos2d@, position
p2	pos2d@, position
p3	pos2d@, position

polygon() [2/6]

polygon::polygon	(	const pos2d@	p1,
		const pos2d@	p2,
		const pos2d@	p3,
		const pos2d@	p4
	)

Create quadrilateral polygon, points must be given in CCW order.

Parameters

p1	pos2d@, position
p2	pos2d@, position
p3	pos2d@, position
p4	pos2d@, position

polygon() [3/6]

polygon::polygon	(	const pos2d@	p1,
		const pos2d@	p2,
		const pos2d@	p3,
		const pos2d@	p4,
		const pos2d@	p5
	)

Create 5-sided polygon, points must be given in CCW order.

Parameters

p1	pos2d@, position
p2	pos2d@, position
p3	pos2d@, position
p4	pos2d@, position
p5	pos2d@, position

polygon() [4/6]

polygon::polygon	(	const spline2d@	spline,
		uint	nseg = 30
	)

Create polygon from spline curve and number of straight segments, points must be given in CCW order.

Parameters

spline	spline2d@, 2d spline curve defining polygon profile
nseg	uint, number of straight segments for spline

polygon() [5/6]

polygon::polygon	(	double	r,
		uint	np
	)

Create a circular polygon from a radius and np points.

Parameters

r	double
np	uint

polygon() [6/6]

polygon::polygon	(	array< pos2d@>@	points,
		bool	check = true
	)

Create a polygon from an array of points.

Parameters

points	array@
check	bool

Member Function Documentation

area()

double polygon::area

(

)

const

Polygon area.

return computed area of polygon

Returns

double

signed_area()

double polygon::signed_area

(

)

const

Signed polygon area, return negative area for polygons oriented CW.

return signed computed area of polygon

Returns

double

size()

uint polygon::size

(

)

const

number of polygon points

Returns

uint, number of polygon points

vertex()

pos2d@ polygon::vertex

(

uint

iv

)

const

Return polygon vertex from zero based vertex index iv.

Parameters

iv

uint

Returns

pos2d@

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The documentation for this class was generated from the following file:

• angelcad.h