2 files changed, 24 insertions, 5 deletions

diff --git a/src/stage.c b/src/stage.c
index 20a1fc0..b50bc22 100644
--- a/src/stage.c
+++ b/src/stage.c
@@ -37,6 +37,7 @@ struct stage_node_t {
 	char			name[STAGE_NODE_NAME_MAX];
 	stage_cached_t		cached;
 	aabb_t			aabb;		/* node coordinates expressed in the space of -1.0...1.0 */
+	v2f_t			position;	/* position of node, optionally used to move aabb as a whole */
 	float			alpha;		/* alpha for the texture when composited */
 	double			angle;		/* angle for the texture when composited */
 	unsigned		active:1;	/* node is active */
@@ -182,6 +183,22 @@ void stage_node_get_aabb(const stage_t *stage, stage_node_t *node, aabb_t *res_a
 }
 
 
+/* set the position for a node */
+void stage_node_set_position(const stage_t *stage, stage_node_t *node, float x, float y)
+{
+	node->position.x = x;
+	node->position.y = y;
+}
+
+
+/* get the position for a node */
+void stage_node_get_position(const stage_t *stage, stage_node_t *node, float *res_x, float *res_y)
+{
+	*res_x = node->position.x;
+	*res_y = node->position.y;
+}
+
+
 /* set a node to active (participates in rendering) */
 void stage_node_set_active(const stage_t *stage, stage_node_t *node)
 {
@@ -309,14 +326,14 @@ void stage_fit(const stage_t *stage, int width, int height, int *res_width, int
 }
 
 
-static void aabb_to_rect(const aabb_t *aabb, const SDL_Rect *stage_rect, SDL_Rect *res_rect)
+static void aabb_to_rect(const aabb_t *aabb, const v2f_t *pos, const SDL_Rect *stage_rect, SDL_Rect *res_rect)
 {
 	float	half_w = ((float)stage_rect->w) * .5f, half_h = ((float)stage_rect->h) * .5f;	/* FIXME silly to recompute this repeatedly... */
 
 	res_rect->x = stage_rect->x;
 	res_rect->y = stage_rect->y;
-	res_rect->x += ((float)aabb->min.x) * half_w + half_w;
-	res_rect->y += stage_rect->h - (((float)aabb->max.y) * half_h + half_h);
+	res_rect->x += ((float)aabb->min.x + pos->x) * half_w + half_w;
+	res_rect->y += stage_rect->h - (((float)aabb->max.y + pos->y) * half_h + half_h);
 
 	res_rect->w = (aabb->max.x - aabb->min.x) * half_w;
 	res_rect->h = (aabb->max.y - aabb->min.y) * half_h;
@@ -334,7 +351,7 @@ static void render_nodes(list_head_t *head, SDL_Renderer *renderer, SDL_Rect *de
 			continue;
 
 		/* scale the node's aabb stage coordinates to destination renderer coordinates */
-		aabb_to_rect(&node->aabb, dest_rect, &node_rect);
+		aabb_to_rect(&node->aabb, &node->position, dest_rect, &node_rect);
 
 		/* if we have a cached texture, see if the dimensions changed */
 		if (node->cached.texture &&
@@ -442,7 +459,7 @@ stage_node_t * stage_node_lookup_cartesian(const stage_t *stage, int x, int y)
 			if (!node->active)
 				continue;
 
-			aabb_to_rect(&node->aabb, &rect, &node_rect);
+			aabb_to_rect(&node->aabb, &node->position, &rect, &node_rect);
 			if (x >= node_rect.x && x < node_rect.x + node_rect.w &&
 			    y >= node_rect.y && y < node_rect.y + node_rect.h)
 				return node;
diff --git a/src/stage.h b/src/stage.h
index 05ee3ec..ff43847 100644
--- a/src/stage.h
+++ b/src/stage.h
@@ -44,6 +44,8 @@ stage_node_t * stage_node_free(stage_t *stage, stage_node_t *node);
 void stage_node_set_alpha(const stage_t *stage, stage_node_t *node, float alpha);
 void stage_node_set_aabb(const stage_t *stage, stage_node_t *node, const aabb_t *aabb);
 void stage_node_get_aabb(const stage_t *stage, stage_node_t *node, aabb_t *res_aabb);
+void stage_node_set_position(const stage_t *stage, stage_node_t *node, float x, float y);
+void stage_node_get_position(const stage_t *stage, stage_node_t *node, float *res_x, float *res_y);
 void stage_node_set_active(const stage_t *stage, stage_node_t *node);
 void stage_node_set_inactive(const stage_t *stage, stage_node_t *node);
 void stage_node_set_locked(const stage_t *stage, stage_node_t *node);