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make transformations cumulative (i.e. add to current state instead of simply setting value)

	this replicates Processing behaviour.

--- a/api.c

+++ b/api.c

@@ -408,7 +408,7 @@

 	x = luaL_checkinteger(L, 1);

 	y = luaL_checkinteger(L, 2);

-	origin = Pt(x, y);

+	origin = addpt(origin, Pt(x, y));

 	return 0;

 }

@@ -415,7 +415,7 @@

 int

 crotate(lua_State *L)

 {

-	angle = luaL_checknumber(L, 1);

+	angle += luaL_checknumber(L, 1);

 	return 0;

 }