Polygon Class Reference

Represent polygons in 2D as a list of vertices in counter-clockwise order. More...

#include <Polygon.hpp>

Collaboration diagram for Polygon:

Public Member Functions
	Polygon ()
	Polygon (Point mid, float radius, GLuint colorIndex)
size_t	getVertCount () const
void	getDrawInfo (std::vector< WGLVertex > &vertices, GLuint z) const
Point const &	getCreationPoint ()
void	displace (const std::vector< Displacement > &displacements, size_t canvasSize)
void	makeCircle (Point mid, float radius)

Static Public Attributes
static constexpr float	MIN_R = 0.0001

Detailed Description

Represent polygons in 2D as a list of vertices in counter-clockwise order.

Constructor & Destructor Documentation

Polygon() [1/2]

Polygon::Polygon

(

)

Create an empty Polygon.

Polygon() [2/2]

Polygon::Polygon	(	Point	mid,
		float	radius,
		GLuint	colorIndex
	)

Create a circle.

Parameters

mid	Middle point of the circle.
radius	Radius of the circle.

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Member Function Documentation

displace()

void Polygon::displace	(	const std::vector< Displacement > &	displacements,
		size_t	canvasSize
	)

Displace a polygon as a result of a new circle appearing. The math for this function was provided by Prof. Graham Horton.

Parameters

displacements	vector of circles with radius and diameter which causes displacement
canvasSize	size of canvas in pixel to calculate vertex insertion for smooth edges.

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getCreationPoint()

Point const & Polygon::getCreationPoint

(

)

Return the point which was the original middle point.

Returns

middle point

getDrawInfo()

void Polygon::getDrawInfo	(	std::vector< WGLVertex > &	vertices,
		GLuint	z
	)		const

Fill vectors with infos needed for drawing. Intended to be used for glDrawElements(). Therefore 3 consecutive indices define one triangle to be drawn and refer to vertices inside the vertices vector.

Parameters

indices	Vector to be filled with triangle information.
vertices	Vector to be filled with vertices.

Attention

Winding order is clockwise so face culling in WGL needs to be disabled. This is no performance limitation as each triangle is allways visible.

getVertCount()

size_t Polygon::getVertCount

(

)

const

Returns

Number of vertices of a polygon.

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makeCircle()

void Polygon::makeCircle	(	Point	mid,
		float	radius
	)

Redraw Polygon as a new circle. This is intended to be used for making the circle larger.

Parameters

mid	Middle point of the circle.
radius	Radius of the circle.

Attention

Will throw an error if used on a polygon that is no longer a circle.

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Member Data Documentation

MIN_R

constexpr float Polygon::MIN_R = 0.0001

staticconstexpr

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

• include/Polygon.hpp
• src/Polygon.cpp