block.cc File Reference

#include "region.hh"
#include "worldfile.hh"

Include dependency graph for block.cc:

Go to the source code of this file.

Functions
static radians_t	angle_change (point_t v1, point_t v2)
	util; How much was v1 rotated to get to v2? More...
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] More...
static bool	is_canonical_winding (vector< point_t > const &ps)
	Util. More...
static void	pi_ize (radians_t &angle)
	util; puts angle into -pi/2, pi/2 More...
static void	positivize (radians_t &angle)
	util; puts angle into [0, 2pi) More...
void	swap (int &a, int &b)

Function Documentation

angle_change()

static radians_t angle_change ( point_t  v1, point_t  v2  )

static

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

Definition at line 354 of file block.cc.

angles_sum()

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.

Definition at line 387 of file block.cc.

canonicalize_winding()

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.

Definition at line 413 of file block.cc.

find_vectors()

static vector<point_t> find_vectors ( vector< point_t > const &  pts )

static

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

Definition at line 371 of file block.cc.

is_canonical_winding()

static bool is_canonical_winding ( vector< point_t > const &  ps )

static

Util.

Definition at line 400 of file block.cc.

pi_ize()

static void pi_ize ( radians_t &  angle )

static

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

Definition at line 343 of file block.cc.

positivize()

static void positivize ( radians_t &  angle )

static

util; puts angle into [0, 2pi)

Definition at line 334 of file block.cc.

swap()

void swap	(	int &	a,
		int &	b
	)

Definition at line 191 of file block.cc.