block.cc File Reference

#include "region.hh"
#include "worldfile.hh"
#include <algorithm>
#include <functional>

Include dependency graph for block.cc:

Functions
static radians_t	angle_change (point_t v1, point_t v2)
	util; How much was v1 rotated to get to v2?
static radians_t	angles_sum (vector< point_t > const &vs)
static void	canonicalize_winding (vector< point_t > &pts)
static vector< point_t >	find_vectors (vector< point_t > const &pts)
	util; find vectors between adjacent points, pts[next] - pts[cur]
static bool	is_canonical_winding (vector< point_t > const &ps)
	Util.
static void	pi_ize (radians_t &angle)
	util; puts angle into -pi/2, pi/2
static void	positivize (radians_t &angle)
	util; puts angle into [0, 2pi)
void	swap (int &a, int &b)

---

Function Documentation

static radians_t angle_change	(	point_t	v1,
		point_t	v2
	)		[static]

util; How much was v1 rotated to get to v2?

static radians_t angles_sum

(

vector< point_t > const &

vs

)

[static]

util; finds sum of angle changes, from each vertex to the next one (in current ordering), wrapping around.

static void canonicalize_winding

(

vector< point_t > &

ps

)

[static]

util; sums angle changes to see whether it's 2pi or -2pi. 2pi is counter-clockwise winding (which OpenGL requires), -2pi is clockwise. Reverses <pts> when winding is clockwise.

static vector<point_t> find_vectors

(

vector< point_t > const &

pts

)

[static]

util; find vectors between adjacent points, pts[next] - pts[cur]

static bool is_canonical_winding

(

vector< point_t > const &

ps

)

[static]

Util.

static void pi_ize

(

radians_t &

angle

)

[static]

util; puts angle into -pi/2, pi/2

static void positivize

(

radians_t &

angle

)

[static]

util; puts angle into [0, 2pi)

void swap	(	int &	a,
		int &	b
	)