Polygon

Polygon. More...

Functions
void	polygon_rotate (point_t *points, uint64_t pointCount, double angle, point_t center)
	Rotate a polygon around a center point.
bool	polygon_contains (double px, double py, const point_t *points, uint64_t pointCount)
	Check if a point is inside a polygon.

Detailed Description

Polygon.

Function Documentation

polygon_contains()

bool polygon_contains	(	double	px,
		double	py,
		const point_t *	points,
		uint64_t	pointCount
	)

Check if a point is inside a polygon.

We use doubles for the point coordinates instead of just point_t to allow for sub-pixel points.

Parameters

px	The x coordinate of the point.
py	The y coordinate of the point.
points	The points of the polygon.
pointCount	The number of points in the polygon.

Returns

true if the point is inside the polygon, false otherwise.

Definition at line 27 of file polygon.c.

References point_t::x, and point_t::y.

Referenced by draw_polygon().

polygon_rotate()

void polygon_rotate	(	point_t *	points,
		uint64_t	pointCount,
		double	angle,
		point_t	center
	)

Rotate a polygon around a center point.

Parameters

points	The points of the polygon.
pointCount	The number of points in the polygon.
angle	The angle to rotate by, in radians.
center	The center point to rotate around.

Definition at line 4 of file polygon.c.

References cos(), NULL, round(), sin(), point_t::x, and point_t::y.

Referenced by draw_hand(), and draw_marker().