fpoint.h File Reference

#include "host.h"
#include <stdio.h>
#include <math.h>

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

Typedefs
typedef FPOINT	FVECTOR

Functions
FLOAT32	DistanceBetween (FPOINT A, FPOINT B)
FLOAT32	NormalizedAngleFrom (FPOINT *Point1, FPOINT *Point2, FLOAT32 FullScale)

Macro Definition Documentation

AngleFrom

#define AngleFrom	(		A,
			B
	)

Value:

( atan2((double) YDelta(A,B),           \
                                        (double) XDelta(A,B) ) )

Definition at line 42 of file fpoint.h.

SlopeFrom

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

Definition at line 41 of file fpoint.h.

XDelta

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

---

Macros

Definition at line 39 of file fpoint.h.

XIntersectionOf

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

Definition at line 45 of file fpoint.h.

YDelta

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

Definition at line 40 of file fpoint.h.

Typedef Documentation

FVECTOR

typedef FPOINT FVECTOR

Definition at line 33 of file fpoint.h.

Function Documentation

DistanceBetween()

FLOAT32 DistanceBetween	(	FPOINT	A,
		FPOINT	B
	)

Definition at line 30 of file fpoint.cpp.

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

NormalizedAngleFrom()

FLOAT32 NormalizedAngleFrom	(	FPOINT *	Point1,
		FPOINT *	Point2,
		FLOAT32	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

none

Note

Globals: none

Exceptions: none

History: Wed Mar 28 14:27:25 1990, DSJ, Created.

Definition at line 48 of file fpoint.cpp.

                                               {
  FLOAT32 Angle;
  FLOAT32 NumRadsInCircle = 2.0 * PI;

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