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 1d4796c94fe39a6efbab6f03bdfd76a9c74a12b3..cf7bf8b682412c6970706af7c020d5cd291efa1a 100644 (file)
--- a/akamaru.h
+++ b/akamaru.h
@@ -12,6 +12,8 @@ typedef struct _Stick Stick;
 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;
@@ -53,6 +55,16 @@ struct _OffsetSpring {
   int dx, dy;
 };
 
+struct _Spacer {
+  Object *a, *b;
+  int length;
+};
+
+struct _Anchor {
+  Object *object;
+  double x, y;
+};
+
 struct _Polygon {
   int num_points;
   Point *points;
@@ -73,13 +85,16 @@ struct _Model {
   Spring *springs;
   int num_offset_springs;
   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;
 };
@@ -88,7 +103,10 @@ void object_init (Object *object, double x, double y, double mass);
 void offset_spring_init (OffsetSpring *spring,
                         Object *a, Object *b, double dx, double dy);
 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);