shithub: asif

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path: chebyshev distance

--- a/path/grid.c

+++ b/path/grid.c

@@ -32,6 +32,16 @@

 }

 double

+chebdist(Node *a, Node *b)

+{

+	int dx, dy;

+

+	dx = abs(a->x - b->x);

+	dy = abs(a->y - b->y);

+	return 1 * (dx + dy) + MIN(dx, dy) * (1 - 2 * 1);

+}

+

+double

 manhdist(Node *a, Node *b)

 {

 	int dx, dy;

@@ -56,9 +66,11 @@

 unitmovecost(Node *a, Node *b)

 {

 	Vertex Δ;

+	double f;

 	Δ = ΔV(*b, *a);

-	return Δ.x != 0 && Δ.y != 0 ? 1.001 : 1.0;

+	f = distfn == octdist ? SQRT2 : 1.001;

+	return Δ.x != 0 && Δ.y != 0 ? f : 1.0;

 }

 int

--- a/path/path.h

+++ b/path/path.h

@@ -25,9 +25,11 @@

 	Deuclid,

 	Dmanhattan,

 	Doctile,

+	Dchebyshev,

 };

 double	eucdist(Node*, Node*);

 double	octdist(Node*, Node*);

+double	chebdist(Node*, Node*);

 double	manhdist(Node*, Node*);

 extern double	(*distfn)(Node*, Node*);