From 9d046b50e4f7460641d2e808b5ef13cec2480978 Mon Sep 17 00:00:00 2001
From: lecoanet
Date: Mon, 18 Oct 2004 11:21:08 +0000
Subject: It is now possible to ask a coordinate from an empty curve/contour
 without triggering an error. The return value is an empty list.

---
 generic/Curve.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'generic')

diff --git a/generic/Curve.c b/generic/Curve.c
index ed75c83..b580d56 100644
--- a/generic/Curve.c
+++ b/generic/Curve.c
@@ -1682,6 +1682,15 @@ Coords(ZnItem		item,
   /*printf("contour %d, num_pts %d, index %d, cmd %d\n",
     contour, *num_pts, index, cmd);*/
   /*printf("nb contours: %d\n", cv->shape.num_contours);*/
+  /*
+   * Special case for reading an empty curve.
+   */
+  if (((cmd == ZN_COORDS_READ) || (cmd == ZN_COORDS_READ_ALL)) &&
+      (cv->shape.num_contours == 0)) {
+    *num_pts = 0;
+    return TCL_OK;
+  }
+
   if (contour < 0) {
     contour += cv->shape.num_contours;
   }
@@ -1792,6 +1801,11 @@ Coords(ZnItem		item,
       }
     }
     else {
+      /* Special case for an empty contour. */
+      if (c->num_points == 0) {
+	*num_pts = 0;
+	return TCL_OK;
+      }
       if (index < 0) {
 	index += c->num_points;
       }
-- 
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