From a0c0fd8387a0927a563ea373455f58798484782a Mon Sep 17 00:00:00 2001
From: Bill Meltsner <bill@meltsner.com>
Date: Sat, 24 Sep 2011 03:39:21 -0400
Subject: [PATCH] Add Body:getWorldPoints, basically for use with
 PolygonShape:getPoints to facilitate easier drawing

--HG--
branch : box2d-update
---
 src/modules/physics/box2d/Body.cpp      | 19 +++++++++++++++++++
 src/modules/physics/box2d/Body.h        |  6 ++++++
 src/modules/physics/box2d/wrap_Body.cpp |  8 ++++++++
 src/modules/physics/box2d/wrap_Body.h   |  1 +
 4 files changed, 34 insertions(+)

diff --git a/src/modules/physics/box2d/Body.cpp b/src/modules/physics/box2d/Body.cpp
index c689099d8..110b95642 100644
--- a/src/modules/physics/box2d/Body.cpp
+++ b/src/modules/physics/box2d/Body.cpp
@@ -281,6 +281,25 @@ namespace box2d
 		x_o = v.x;
 		y_o = v.y;
 	}
+	
+	int Body::getWorldPoints(lua_State * L)
+	{
+		int argc = lua_gettop(L);
+		int vcount = (int)argc/2;
+		// at least one point
+		love::luax_assert_argc(L, 2);
+		
+		for(int i = 0;i<vcount;i++)
+		{
+			float x = (float)lua_tonumber(L, i*2+1);
+			float y = (float)lua_tonumber(L, i*2+2);
+			b2Vec2 point = Physics::scaleUp(body->GetWorldPoint(Physics::scaleDown(b2Vec2(x, y))));
+			lua_pushnumber(L, point.x);
+			lua_pushnumber(L, point.y);
+		}
+		
+		return argc;
+	}
 
 	void Body::getLocalPoint(float x, float y, float & x_o, float & y_o)
 	{
diff --git a/src/modules/physics/box2d/Body.h b/src/modules/physics/box2d/Body.h
index 581d42d36..416dc926a 100644
--- a/src/modules/physics/box2d/Body.h
+++ b/src/modules/physics/box2d/Body.h
@@ -282,6 +282,12 @@ namespace box2d
 		* @returns The y-coordinate of the vector in world coordinates.
 		**/
 		void getWorldVector(float x, float y, float & x_o, float & y_o);
+		
+		/**
+		* Transforms a series of points (x, y) from local coordinates
+		* to world coordinates.
+		**/
+		int getWorldPoints(lua_State * L);
 
 		/**
 		* Transforms a point (x, y) from world coordinates
diff --git a/src/modules/physics/box2d/wrap_Body.cpp b/src/modules/physics/box2d/wrap_Body.cpp
index 71e0fb3cc..bc7883394 100644
--- a/src/modules/physics/box2d/wrap_Body.cpp
+++ b/src/modules/physics/box2d/wrap_Body.cpp
@@ -360,6 +360,13 @@ namespace box2d
 
 		return 2;
 	}
+	
+	int w_Body_getWorldPoints(lua_State * L)
+	{
+		Body * t = luax_checkbody(L, 1);
+		lua_remove(L, 1);
+		return t->getWorldPoints(L);
+	}
 
 	int w_Body_getLocalPoint(lua_State * L)
 	{
@@ -557,6 +564,7 @@ namespace box2d
 		{ "setType", w_Body_setType },
 		{ "getWorldPoint", w_Body_getWorldPoint },
 		{ "getWorldVector", w_Body_getWorldVector },
+		{ "getWorldPoints", w_Body_getWorldPoints },
 		{ "getLocalPoint", w_Body_getLocalPoint },
 		{ "getLocalVector", w_Body_getLocalVector },
 		{ "getLinearVelocityFromWorldPoint", w_Body_getLinearVelocityFromWorldPoint },
diff --git a/src/modules/physics/box2d/wrap_Body.h b/src/modules/physics/box2d/wrap_Body.h
index b4f58d2cd..bbee3e6b6 100644
--- a/src/modules/physics/box2d/wrap_Body.h
+++ b/src/modules/physics/box2d/wrap_Body.h
@@ -67,6 +67,7 @@ namespace box2d
 	int w_Body_setType(lua_State * L);
 	int w_Body_getWorldPoint(lua_State * L);
 	int w_Body_getWorldVector(lua_State * L);
+	int w_Body_getWorldPoints(lua_State * L);
 	int w_Body_getLocalPoint(lua_State * L);
 	int w_Body_getLocalVector(lua_State * L);
 	int w_Body_getLinearVelocityFromWorldPoint(lua_State * L);