shithub: nanobsp

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implemented BSP_SameDirection().

--- a/nano_bsp.c

+++ b/nano_bsp.c

@@ -216,6 +216,19 @@

 	return 0;

 }

+boolean BSP_SameDirection (seg_t * part, seg_t * seg)

+{

+	fixed_t	pdx = part->v2->x - part->v1->x;

+	fixed_t	pdy = part->v2->y - part->v1->y;

+

+	fixed_t sdx = seg->v2->x - seg->v1->x;

+	fixed_t sdy = seg->v2->y - seg->v1->y;

+

+	int64_t n = (int64_t)sdx * (int64_t)pdx + (int64_t)sdy * (int64_t)pdy;

+

+	return (n > 0);

+}

+

 int BSP_SegOnSide (seg_t * part, seg_t * seg)

 {

 	int side1 = BSP_PointOnSide (part, seg->v1->x, seg->v1->y);

@@ -222,12 +235,7 @@

 	int side2 = BSP_PointOnSide (part, seg->v2->x, seg->v2->y);

 	if (side1 == 0 && side2 == 0)

-	{

-		// FIXME

-		boolean on_right = false;

-

-		return on_right ? +1 : -1;

-	}

+		return BSP_SameDirection (part, seg) ? +1 : -1;

 	// splits the seg?

 	if ((side1 *= side2) < 0)

-- 

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