From e865c87f9102e646e6c13d9005b288e4ede5c7d6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Henrik=20Grubbstr=C3=B6m=20=28Grubba=29?=
<grubba@grubba.org>
Date: Mon, 6 Oct 1997 17:02:13 +0200
Subject: [PATCH] Improved check for vertical vertices.
Rev: src/modules/Image/polyfill.c:1.6
---
src/modules/Image/polyfill.c | 39 +++++++++++++++++++-----------------
1 file changed, 21 insertions(+), 18 deletions(-)
diff --git a/src/modules/Image/polyfill.c b/src/modules/Image/polyfill.c
index b91a2b08ca..c2822c60cd 100644
--- a/src/modules/Image/polyfill.c
+++ b/src/modules/Image/polyfill.c
@@ -28,7 +28,7 @@ extern double floor(double);
/*
**! module Image
**! note
-**! $Id: polyfill.c,v 1.5 1997/08/30 18:36:09 grubba Exp $<br>
+**! $Id: polyfill.c,v 1.6 1997/10/06 15:02:13 grubba Exp $<br>
**! class image
*/
@@ -90,28 +90,31 @@ static void vertex_connect(struct vertex *above,
struct vertex *below)
{
struct vertex_list *c,*d;
+ float diff;
if (below==above) return;
- c=malloc(sizeof(struct vertex_list));
- c->above=above; c->below=below;
- c->next=above->below;
- if (below->y!=above->y)
- c->dx=(below->x-above->x)/(below->y-above->y);
+ c = malloc(sizeof(struct vertex_list));
+ c->above = above; c->below = below;
+ c->next = above->below;
+ if (((diff = (below->y - above->y)) < 1.0e-10) &&
+ (diff > -1.0e-10))
+ c->dx = 1.0e10;
else
- c->dx=1e10;
- if (below->x!=above->x)
- c->dy=(below->y-above->y)/(below->x-above->x);
+ c->dx = (below->x - above->x)/diff;
+ if (((diff = (below->x - above->x)) < 1.0e-10) &&
+ (diff > -1.0e-10))
+ c->dy = 1.0e10;
else
- c->dy=1e10;
- above->below=c;
-
- d=malloc(sizeof(struct vertex_list));
- d->above=above; d->below=below;
- d->next=below->above;
- d->dx=c->dx;
- d->dy=c->dy;
- below->above=d;
+ c->dy = (below->y - above->y)/diff;
+ above->below = c;
+
+ d = malloc(sizeof(struct vertex_list));
+ d->above = above; d->below = below;
+ d->next = below->above;
+ d->dx = c->dx;
+ d->dy = c->dy;
+ below->above = d;
}
static INLINE float vertex_xmax(struct vertex_list *v,float yp,float *ydest)
--
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