From 6a12d4724b9c2e09e0d289a2f3fc77ee0e166001 Mon Sep 17 00:00:00 2001
From: Werner Almesberger <werner@almesberger.net>
Date: Thu, 8 Jan 2015 08:07:21 -0300
Subject: [PATCH] slicer/slice.c: repeat lower cuts at intermediate points

---
 slicer/slice.c | 32 ++++++++++++++++++++++++--------
 1 file changed, 24 insertions(+), 8 deletions(-)

diff --git a/slicer/slice.c b/slicer/slice.c
index 167bb07..38b794b 100644
--- a/slicer/slice.c
+++ b/slicer/slice.c
@@ -23,6 +23,7 @@
 struct line {
 	float ax, ay;
 	float bx, by;
+	float cz;
 	struct line *next;
 };
 
@@ -87,6 +88,7 @@ fprintf(stderr, "zero point\n");
 	line->ay = a->y;
 	line->bx = b->x;
 	line->by = b->y;
+	line->cz = c->z;
 	line->next = z->lines;
 	z->lines = line;
 }
@@ -112,24 +114,38 @@ void slice(struct v f[3])
 /* ----- Dumping ----------------------------------------------------------- */
 
 
-static gboolean dump(gpointer key, gpointer value, gpointer data)
+static gboolean dump_layer(gpointer key, gpointer value, gpointer data)
 {
-	const struct z *z = value;
+	const struct z *z0 = data;
+	const struct z *z1 = value;
 	const struct line *line;
 
-	if (!z->present)
+	if (z0->z > z1->z)
 		return 0;
-	for (line = z->lines; line; line = line->next)
-		printf("%f %f %f\n%f %f %f\n\n\n",
-		    line->ax, line->ay, z->z,
-		    line->bx, line->by, z->z);
+	if (!z1->present)
+		return 0;
+	for (line = z0->lines; line; line = line->next)
+		if (line->cz >= z1->z)
+			printf("%f %f %f\n%f %f %f\n\n\n",
+			    line->ax, line->ay, z1->z,
+			    line->bx, line->by, z1->z);
+	return 0;
+}
+
+
+static gboolean dump_range(gpointer key, gpointer value, gpointer data)
+{
+	const struct z *z = value;
+
+	if (z->present)
+		g_tree_foreach(tree, dump_layer, value);
 	return 0;
 }
 
 
 void slice_dump(void)
 {
-	g_tree_foreach(tree, dump, NULL);
+	g_tree_foreach(tree, dump_range, NULL);
 }