Add anchor constraint and use it to lock center point in dock model.

[akamaru] / akamaru.h

diff --git a/akamaru.h b/akamaru.h
index 1646a342e6bcb2e69d2b206663249200ce6d2f47..cf7bf8b682412c6970706af7c020d5cd291efa1a 100644 (file)
--- a/akamaru.h
+++ b/akamaru.h
@@ -13,6 +13,7 @@ typedef struct _String String;
 typedef struct _Spring Spring;
 typedef struct _OffsetSpring OffsetSpring;
 typedef struct _Spacer Spacer;
+typedef struct _Anchor Anchor;
 typedef struct _Polygon Polygon;
 typedef struct _Offset Offset;
 typedef struct _Model Model;
@@ -59,6 +60,11 @@ struct _Spacer {
   int length;
 };
 
+struct _Anchor {
+  Object *object;
+  double x, y;
+};
+
 struct _Polygon {
   int num_points;
   Point *points;
@@ -81,13 +87,14 @@ struct _Model {
   OffsetSpring *offset_springs;
   int num_spacers;
   Spacer *spacers;
+  int num_anchors;
+  Anchor *anchors;
   int num_polygons;
   Polygon *polygons;
   double k;
   double friction;
 
-  Object *anchor_object;
-  Vector anchor_position;
+  Anchor mouse_anchor;
 
   double theta;
 };
@@ -99,6 +106,7 @@ void spring_init (Spring *spring, Object *a, Object *b, double length);
 void stick_init (Stick *stick, Object *a, Object *b, double length);
 void string_init (String *string, Object *a, Object *b, double length);
 void spacer_init (Spacer *spacer, Object *a, Object *b, double length);
+void anchor_init (Anchor *anchor, Object *object, double x, double y);
 
 void polygon_init (Polygon *p, int num_points, ...);
 void polygon_init_diamond (Polygon *polygon, double x, double y);