paths.cpp File Reference

(r1785/r1492)

#include "camtypes.h"
#include <math.h>
#include "pathutil.h"
#include "pathproc.h"
#include "vector.h"
#include "osrndrgn.h"
#include "pen.h"
#include "blobs.h"
#include "fitcurve.h"
#include "layermgr.h"
#include "gclip.h"
#include "grndrgn.h"
#include "XaDraw.h"
#include "cstroke.h"

Go to the source code of this file.

Functions
	DECLARE_SOURCE ("$Revision: 1492 $")
INT32	FindNonColinear (const DocCoord CoordArray[], const UINT32 &ulNumCoords)
	Support function for IsIsometric Finds the first of three points in the given CoordArray that are not in a straight line.
template<class T>
BOOL	IsNear (const T &x1, const T &x2, const T &Tolerance)
	Support function for IsIsometric Determines whether two values are near enough to each other to be considered equal. Notes: This is a templated function with <class t>="">.
BOOL	Solve3Simultaneous (const CCVector3 &constsX0, const CCVector3 &constsX1, const CCVector3 &constsY0, double &v0, double &v1, double &v2)
	Support function for IsIsometric Determines whether two values are near enough to each other to be considered equal. Notes: This is a templated function with <class t>="">Support function for IsIsometric Solves 3 simultaneous equations for the three values v1,v2,v3.

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Function Documentation

DECLARE_SOURCE (  "$Revision: 1492 $"   )

INT32 FindNonColinear (  const DocCoord  CoordArray[], const UINT32 &  ulNumCoords )

Support function for IsIsometric Finds the first of three points in the given CoordArray that are not in a straight line. Author: Colin_Barfoot (Xara Group Ltd) <camelotdev@xara.com> Date: 28/08/96 Parameters: CoordArray,:  The path with which to comapre this one [INPUTS] Tolerance: The accuracy to which this path transformed to the otherPath may be considered equal. Returns: The index in the array of the first point -1 if a straight line Definition at line 9890 of file paths.cpp. { UINT32 index = 0; UINT32 x1,y1,x2,y2; // Three points are colinear if the vectors between them have a zero cross-product while (index < ulNumCoords - 2) { // Might save time to work out the first two outside the loop // Depends on number of linear paths really x1 = CoordArray[index + 1].x - CoordArray[index].x; y1 = CoordArray[index + 1].y - CoordArray[index].y; x2 = CoordArray[index + 2].x - CoordArray[index + 1].x; y2 = CoordArray[index + 2].y - CoordArray[index + 1].y; if (x1 * y2 != x2 * y1) { return index; } ++index; } return -1; }

template<class T> BOOL IsNear (  const T &  x1, const T &  x2, const T &  Tolerance )  [inline]

Support function for IsIsometric Determines whether two values are near enough to each other to be considered equal. Notes: This is a templated function with <class t>="">. Author: Colin_Barfoot (Xara Group Ltd) <camelotdev@xara.com> Date: 28/08/96 Parameters: x1,:  The first of the two values to compare [INPUTS] x2: The second of the two values to compare Tolerance: The value within which x1 is considered to be near to x2 Returns: TRUE if the two values have an absolute difference greater than or equal to the given Tolerance FALSE otherwise Definition at line 9936 of file paths.cpp. { return (ABS(x1 - x2) <= Tolerance) ? TRUE : FALSE; }

BOOL Solve3Simultaneous (  const CCVector3 &  constsX0, const CCVector3 &  constsX1, const CCVector3 &  constsY0, double &  v0, double &  v1, double &  v2 )

Support function for IsIsometric Determines whether two values are near enough to each other to be considered equal. Notes: This is a templated function with <class t>="">Support function for IsIsometric Solves 3 simultaneous equations for the three values v1,v2,v3. Author: Colin_Barfoot (Xara Group Ltd) <camelotdev@xara.com> Date: 28/08/96 Parameters: constsX0,:  First values in the 3 simultaneous equations [INPUTS] constsX1: Second values in the 3 simultaneous equations constsY0: Third values in the 3 simultaneous equations v1,v2,v3,:  The three solution values [OUTPUTS] Returns: TRUE if there were a solution FALSE otherwise Definition at line 9979 of file paths.cpp. { const double Tolerance = 1e-10; double DivA = (constsX0.v0 - constsX0.v1) * (constsY0.v0 - constsY0.v2) - (constsX0.v0 - constsX0.v2) * (constsY0.v0 - constsY0.v1); if (IsNear(DivA, 0.0, Tolerance)) { return FALSE; } double DivB = (constsY0.v0 - constsY0.v1) * (constsX0.v0 - constsX0.v2) - (constsY0.v0 - constsY0.v2) * (constsX0.v0 - constsX0.v1); if (IsNear(DivB, 0.0, Tolerance)) { return FALSE; } v0 = ((constsY0.v0 - constsY0.v2) * (constsX1.v0 - constsX1.v1) - (constsY0.v0 - constsY0.v1) * (constsX1.v0 - constsX1.v2)) / DivA; v1 = ((constsX1.v0 - constsX1.v1) * (constsX0.v0 - constsX0.v2) - (constsX1.v0 - constsX1.v2) * (constsX0.v0 - constsX0.v1)) / DivB; v2 = constsX1.v0 - v0 * constsX0.v0 - v1 * constsY0.v0; return TRUE; }

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