From db4dc418f59fe5498fddb450a78f677a05cf40ed Mon Sep 17 00:00:00 2001
From: lecoanet
Date: Wed, 21 Jun 2000 14:42:19 +0000
Subject: Ajustement des structures de classe pour ajout de la m�thode Part.
 Ecriture de la m�thode PickVertex.

---
 Bezier.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 57 insertions(+), 4 deletions(-)

(limited to 'Bezier.c')

diff --git a/Bezier.c b/Bezier.c
index 0de6af5..7bba1d5 100644
--- a/Bezier.c
+++ b/Bezier.c
@@ -1087,15 +1087,67 @@ Coords(Item	item,
 /*
  **********************************************************************************
  *
+ * PickVertex --
+ *	Return in 'vertex' the vertex closest to p and in 'o_vertex' the
+ *	opposite vertex on the closest edge, if such an edge exists or -1
+ *	in the other case.
+ *
+ **********************************************************************************
+ */
+static void
+PickVertex(Item		item,
+	   ZnPoint	*p,
+	   int		*contour,
+	   int		*vertex,
+	   int		*o_vertex)
+{
+  BezierItem	bz = (BezierItem) item;
+  int		i, k, num_points;
+  ZnPoint	*points;
+  ZnReal	dist=1.0e40, new_dist, dist2;
+
+  *contour = *vertex = *o_vertex = -1;
+  
+  if ((bz->line_width > 0) || ISSET(bz->flags, FILLED_OK)) {
+    points = (ZnPoint *) ZnListArray(bz->dev_points);
+    num_points = ZnListSize(bz->dev_points);
+    for (i = 0; i < num_points; i++) {
+      new_dist = hypot(points[i].x - p->x, points[i].y - p->y);
+      if (new_dist < dist) {
+	dist = new_dist;
+	*contour = 0;
+	*vertex = i;
+      }
+    }
+    /*
+     * Update the opposite vertex.
+     */
+    i = (*vertex+1) % num_points;
+    new_dist = LineToPointDist(&points[*vertex], &points[i], p);
+    k = ((unsigned)(*vertex-1)) % num_points;
+    dist2 = LineToPointDist(&points[*vertex], &points[k], p);
+    if (dist2 < new_dist) {
+      *o_vertex = k;
+    }
+    else {
+      *o_vertex = i;
+    }
+  }
+}
+
+
+/*
+ **********************************************************************************
+ *
  * Exported functions struct --
  *
  **********************************************************************************
  */
 static ItemClassStruct BEZIER_ITEM_CLASS = {
   sizeof(BezierItemStruct),
-  False,
-  False,
-  False,
+  False,		/* has_fields */
+  0,			/* num_parts */
+  False,		/* has_anchors */
   "bezier",
   bz_attrs,
   Init,
@@ -1111,6 +1163,7 @@ static ItemClassStruct BEZIER_ITEM_CLASS = {
   NULL,			/* DeleteChars */
   NULL,			/* Cursor */
   NULL,			/* Index */
+  NULL,			/* Part */
   NULL,			/* Selection */
   NULL,			/* Contour */
   ComputeCoordinates,
@@ -1118,7 +1171,7 @@ static ItemClassStruct BEZIER_ITEM_CLASS = {
   Draw,
   IsSensitive,
   Pick,
-  NULL,			/* PickVertex */
+  PickVertex,		/* PickVertex */
   PostScript
 };
 
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