| 140 |
|
ncross = 0; |
| 141 |
|
/* positive x axis cross test */ |
| 142 |
|
while (n--) { |
| 143 |
+ |
if (FRELEQ(p0[yi], y) && FRELEQ(p1[yi], y) && |
| 144 |
+ |
(p0[xi] > x) ^ (p1[xi] > x)) |
| 145 |
+ |
return(1); /* edge case #1 */ |
| 146 |
|
if ((p0[yi] > y) ^ (p1[yi] > y)) { |
| 147 |
|
tst = (p0[xi] > x) + (p1[xi] > x); |
| 148 |
|
if (tst == 2) |
| 151 |
|
double prodA = (p0[yi]-y)*(p1[xi]-x); |
| 152 |
|
double prodB = (p0[xi]-x)*(p1[yi]-y); |
| 153 |
|
if (FRELEQ(prodA, prodB)) |
| 154 |
< |
return(1); /* edge case #1 */ |
| 154 |
> |
return(1); /* edge case #2 */ |
| 155 |
|
ncross += (p1[yi] > p0[yi]) ^ (prodA > prodB); |
| 156 |
|
} else if (FRELEQ(p0[xi], x) && FRELEQ(p1[xi], x)) |
| 157 |
< |
return(1); /* edge case #2 */ |
| 158 |
< |
} else if (FRELEQ(p0[yi], y) && FRELEQ(p1[yi], y) && |
| 156 |
< |
(p0[xi] > x) ^ (p1[xi] > x)) |
| 157 |
< |
return(1); /* edge case #3 */ |
| 157 |
> |
return(1); /* edge case #3 */ |
| 158 |
> |
} |
| 159 |
|
p0 = p1; |
| 160 |
|
p1 += 3; |
| 161 |
|
} |
