ReactOS  0.4.13-dev-100-gc8611ae
polyUtil.h File Reference
#include "definitions.h"
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Functions

Real area (Real A[2], Real B[2], Real C[2])
 
Int pointLeftLine (Real A[2], Real B[2], Real P[2])
 
Int pointLeft2Lines (Real A[2], Real B[2], Real C[2], Real P[2])
 

Function Documentation

◆ area()

Real area ( Real  A[2],
Real  B[2],
Real  C[2] 
)

Definition at line 43 of file polyUtil.cc.

44 {
45  Real Bx, By, Cx, Cy;
46  Bx = B[0] - A[0];
47  By = B[1] - A[1];
48  Cx = C[0] - A[0];
49  Cy = C[1] - A[1];
50  return Bx*Cy - Cx*By;
51 
52 /* return (B[0]-A[0])*(C[1]-A[1]) - (C[0]-A[0])*(B[1]-A[1]);*/
53 }
Definition: ttei1.cpp:12
Definition: ttei6.cpp:27
#define B(row, col)
float Real
Definition: definitions.h:36

Referenced by pointLeft2Lines(), and pointLeftLine().

◆ pointLeft2Lines()

Int pointLeft2Lines ( Real  A[2],
Real  B[2],
Real  C[2],
Real  P[2] 
)

Definition at line 78 of file polyUtil.cc.

79 {
80  Int C_left_AB = (area(A, B, C)>0);
81  Int P_left_AB = (area(A, B, P)>0);
82  Int P_left_BC = (area(B, C, P)>0);
83 
84  if(C_left_AB)
85  {
86  return (P_left_AB && P_left_BC);
87  }
88  else
89  return (P_left_AB || P_left_BC);
90 }
Definition: ttei1.cpp:12
#define P(row, col)
Definition: ttei6.cpp:27
#define B(row, col)
Real area(Real A[2], Real B[2], Real C[2])
Definition: polyUtil.cc:43
int Int
Definition: definitions.h:37

Referenced by MC_partitionY(), and partitionY().

◆ pointLeftLine()

Int pointLeftLine ( Real  A[2],
Real  B[2],
Real  P[2] 
)

Definition at line 64 of file polyUtil.cc.

65 {
66  if(area(A, B, P) >0) return 1;
67  else return 0;
68 }
Definition: ttei1.cpp:12
#define P(row, col)
#define B(row, col)
Real area(Real A[2], Real B[2], Real C[2])
Definition: polyUtil.cc:43