From 1a107b455b485e173ac418921e5d3586429c0eba Mon Sep 17 00:00:00 2001
From: hasufell <hasufell@hasufell.de>
Date: Sat, 31 May 2014 18:43:05 +0200
Subject: [PATCH] Allow to draw bezier curve (only the points)

---
 src/gl_draw.c      | 31 ++++++++++++++++++++++++++++++-
 src/half_edge.c    |  9 +++++++++
 src/half_edge_AS.c |  3 +++
 3 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/src/gl_draw.c b/src/gl_draw.c
index c5d3788..1570cbe 100644
--- a/src/gl_draw.c
+++ b/src/gl_draw.c
@@ -66,6 +66,7 @@ bool shademodel = true;
 /*
  * static function declaration
  */
+static void draw_bez(HE_obj const * const obj);
 static void draw_obj(int32_t const myxrot,
 		int32_t const myyrot,
 		int32_t const myzrot);
@@ -188,6 +189,31 @@ static void draw_vertices(HE_obj const * const obj,
 	glPopMatrix();
 }
 
+static void draw_bez(HE_obj const * const obj)
+{
+	uint32_t i = 0;
+	static float line_width = 2;
+
+	glPushMatrix();
+
+	glLineWidth(line_width);
+	glColor3f(1.0, 0.0, 0.0);
+
+
+	while (i < obj->bzc) {
+		glBegin(GL_LINE_STRIP);
+		for (uint32_t j = 0; j <= obj->bez_curves[i].deg; j++) {
+			glVertex3f(obj->bez_curves[i].vec[j].x,
+				obj->bez_curves[i].vec[j].y,
+				obj->bez_curves[i].vec[j].z);
+		}
+		glEnd();
+		i++;
+	}
+
+	glPopMatrix();
+}
+
 
 /**
  * Draws an object.
@@ -234,7 +260,10 @@ static void draw_obj(int32_t const myxrot,
 	if (show_normals)
 		draw_normals(obj, 0);
 
-	draw_vertices(obj, false);
+	if (obj->ec != 0)
+		draw_vertices(obj, false);
+
+	draw_bez(obj);
 
 	glPopMatrix();
 }
diff --git a/src/half_edge.c b/src/half_edge.c
index 79534d9..e477c5c 100644
--- a/src/half_edge.c
+++ b/src/half_edge.c
@@ -273,6 +273,15 @@ bool normalize_object(HE_obj *obj)
 		obj->vertices[i].vec->z = obj->vertices[i].vec->z * scale_factor;
 	}
 
+	for (uint32_t i = 0; i < obj->bzc; i++) {
+		for (uint32_t j = 0; j <= obj->bez_curves[i].deg; j++) {
+			obj->bez_curves[i].vec[j].x *= scale_factor;
+			obj->bez_curves[i].vec[j].y *= scale_factor;
+			obj->bez_curves[i].vec[j].z *= scale_factor;
+		}
+		i++;
+	}
+
 	return true;
 }
 
diff --git a/src/half_edge_AS.c b/src/half_edge_AS.c
index 7fb7e49..c21b2b6 100644
--- a/src/half_edge_AS.c
+++ b/src/half_edge_AS.c
@@ -535,6 +535,9 @@ HE_obj *parse_obj(char const * const obj_string)
  */
 static void delete_accel_struct(HE_obj *he_obj)
 {
+	if (he_obj->ec == 0)
+		return; /* probably only a bezier curve */
+
 	for (uint32_t i = 0; i < he_obj->vc; i++) {
 		free(he_obj->vertices[i].acc->dummys);
 		free(he_obj->vertices[i].acc->edge_array);