added ag::getTextSize(), varying text size demo in tests/cratestack.lua

git-svn-id: svn://anubis/anaglym/trunk@165 99a6e188-d820-4881-8870-2d33a10e2619

Engine.cc

@@ -488,8 +488,10 @@ void Engine::drawText(const char * text, GLfloat r, GLfloat g, GLfloat b,
     glPopMatrix();
 }
 
-void Engine::getTextSize(const char * text, float * width, float * height)
+void Engine::getTextSize(const char * text, int ptsize,
+        float * width, float * height)
 {
+    m_font->FaceSize(ptsize);
     FTBBox box = m_font->BBox(text);
     *width = box.Upper().Xf() - box.Lower().Xf();
     *height = box.Upper().Yf() - box.Lower().Yf();

Engine.h

@@ -138,7 +138,8 @@ class Engine
         void getScreenSize(int * width, int * height);
         void drawText(const char * text, GLfloat r, GLfloat g, GLfloat b,
                 int ptsize, float x, float y);
-        void getTextSize(const char * text, float * width, float * height);
+        void getTextSize(const char * text, int ptsize,
+                float * width, float * height);
 
         /* lua services */
         int setCamera(lua_State * L);

ag.cc

@@ -45,6 +45,7 @@ namespace ag
             { "loadTexture", loadTexture },
             { "getScreenSize", getScreenSize },
             { "drawText", drawText},
+            { "getTextSize", getTextSize},
 
             { "createBox", createBox},
             { "createStaticBox", createStaticBox},
@@ -371,6 +372,21 @@ namespace ag
         return 0;
     }
 
+    int getTextSize(lua_State * L)
+    {
+        float width = 0.0f;
+        float height = 0.0f;
+        int argc = lua_gettop(L);
+        if (argc == 2 && lua_isstring(L, 1) && lua_isnumber(L, 2))
+        {
+            g_engine->getTextSize(lua_tostring(L, 1), lua_tonumber(L, 2),
+                    &width, &height);
+        }
+        lua_pushnumber(L, width);
+        lua_pushnumber(L, height);
+        return 2;
+    }
+
     static void addManagedObject(lua_State * L, bool is_static,
             OdeWorld::GeomType geom_type, refptr< vector<float> > args)
     {

ag.h

@@ -31,6 +31,7 @@ namespace ag
     int loadTexture(lua_State * L);
     int getScreenSize(lua_State * L);
     int drawText(lua_State * L);
+    int getTextSize(lua_State * L);
 
     int createBox(lua_State * L);
     int createStaticBox(lua_State * L);

tests/cratestack.lua

@@ -44,5 +44,13 @@ function mouse_moves(x, y, xrel, yrel)
 end
 
 function update_overlay_event()
-    ag.drawText("Hi there everyone!", 1, 0.7, 0, 16, 0, 0)
+    y = 4
+    size = 16
+    for i = 0, 17 do
+        local message = "Hello there"
+        local width, height = ag.getTextSize(message, size)
+        ag.drawText(message, 1, 0.7, 0, size, 2, y)
+        y = y + height + 4
+        size = size + 4
+    end
 end