fpoint.h File Reference

#include <cmath>
#include <cstdio>

Go to the source code of this file.

Classes
struct	FPOINT

Macros
#define	XDelta(A, B)   ((B).x - (A).x)
#define	YDelta(A, B)   ((B).y - (A).y)
#define	SlopeFrom(A, B)   (YDelta(A, B) / XDelta(A, B))
#define	AngleFrom(A, B)   (atan2((double)YDelta(A, B), (double)XDelta(A, B)))
#define	XIntersectionOf(A, B, X)   (SlopeFrom(A, B) * ((X)-A.x) + A.y)

Typedefs
using	FVECTOR = FPOINT

Functions
float	DistanceBetween (FPOINT A, FPOINT B)
float	NormalizedAngleFrom (FPOINT *Point1, FPOINT *Point2, float FullScale)

Macro Definition Documentation

AngleFrom

#define AngleFrom	(		A,
			B
	)		(atan2((double)YDelta(A, B), (double)XDelta(A, B)))

Definition at line 40 of file fpoint.h.

SlopeFrom

#define SlopeFrom	(		A,
			B
	)		(YDelta(A, B) / XDelta(A, B))

Definition at line 39 of file fpoint.h.

XDelta

#define XDelta	(		A,
			B
	)		((B).x - (A).x)

---

Macros

Definition at line 37 of file fpoint.h.

XIntersectionOf

#define XIntersectionOf	(		A,
			B,
			X
	)		(SlopeFrom(A, B) * ((X)-A.x) + A.y)

Definition at line 42 of file fpoint.h.

YDelta

#define YDelta	(		A,
			B
	)		((B).y - (A).y)

Definition at line 38 of file fpoint.h.

Typedef Documentation

FVECTOR

using FVECTOR = FPOINT

Definition at line 31 of file fpoint.h.

Function Documentation

DistanceBetween()

float DistanceBetween	(	FPOINT	A,
		FPOINT	B
	)

Definition at line 28 of file fpoint.cpp.

                                          {
  const double xd = XDelta(A, B);
  const double yd = YDelta(A, B);
  return sqrt(static_cast<double>(xd * xd + yd * yd));

NormalizedAngleFrom()

float NormalizedAngleFrom	(	FPOINT *	Point1,
		FPOINT *	Point2,
		float	FullScale
	)

Return the angle from Point1 to Point2 normalized to lie in the range 0 to FullScale (where FullScale corresponds to 2*pi or 360 degrees).

Parameters

Point1	points to compute angle between
Point2	points to compute angle between
FullScale	value to associate with 2*pi

Returns

angle

Definition at line 43 of file fpoint.cpp.

                                                                           {
  float NumRadsInCircle = 2.0 * M_PI;
 
  float Angle = AngleFrom (*Point1, *Point2);
  if (Angle < 0.0)
    Angle += NumRadsInCircle;
  Angle *= FullScale / NumRadsInCircle;
  if (Angle < 0.0 || Angle >= FullScale)
    Angle = 0.0;
  return (Angle);