added ag::drawLine()

git-svn-id: svn://anubis/anaglym/trunk@183 99a6e188-d820-4881-8870-2d33a10e2619

Engine.cc

@@ -524,6 +524,22 @@ void Engine::getTextSize(const char * text, int ptsize,
     *height = box.Upper().Yf() - box.Lower().Yf();
 }
 
+void Engine::drawLine(float r, float g, float b,
+        float x1, float y1, float x2, float y2, float width)
+{
+    glPushAttrib(GL_LINE_BIT | GL_ENABLE_BIT);
+        glDisable(GL_DEPTH_TEST);
+        glDisable(GL_LIGHTING);
+        glEnable(GL_LINE_SMOOTH);
+        glLineWidth(width);
+        glBegin(GL_LINES);
+            glColor3f(r, g, b);
+            glVertex2f(x1, y1);
+            glVertex2f(x2, y2);
+        glEnd();
+    glPopAttrib();
+}
+
 /* called by SDL when the update timer expires */
 Uint32 Engine::updateCallback(Uint32 interval, void * param)
 {

Engine.h

@@ -143,6 +143,8 @@ class Engine
                 int ptsize, float x, float y);
         void getTextSize(const char * text, int ptsize,
                 float * width, float * height);
+        void drawLine(float r, float g, float b,
+                float x1, float y1, float x2, float y2, float width = 1.0f);
 
         /* lua services */
         int setCamera(lua_State * L);

ag.cc

@@ -46,6 +46,7 @@ namespace ag
             { "getScreenSize", getScreenSize },
             { "drawText", drawText},
             { "getTextSize", getTextSize},
+            { "drawLine", drawLine},
 
             { "createBox", createBox},
             { "createStaticBox", createStaticBox},
@@ -391,6 +392,34 @@ namespace ag
         return 2;
     }
 
+    int drawLine(lua_State * L)
+    {
+        int argc = lua_gettop(L);
+        if (argc == 7 || argc == 8)
+        {
+            bool valid = true;
+            for (int i = 1; i <= argc; i++)
+                if (!lua_isnumber(L, i))
+                    valid = false;
+            if (valid)
+            {
+                float width = 1.0f;
+                if (argc == 8)
+                    width = lua_tonumber(L, 8);
+                g_engine->drawLine(
+                        lua_tonumber(L, 1),
+                        lua_tonumber(L, 2),
+                        lua_tonumber(L, 3),
+                        lua_tonumber(L, 4),
+                        lua_tonumber(L, 5),
+                        lua_tonumber(L, 6),
+                        lua_tonumber(L, 7),
+                        width);
+            }
+        }
+        return 0;
+    }
+
     static void addManagedObject(lua_State * L, bool is_static,
             OdeWorld::GeomType geom_type, refptr< vector<float> > args)
     {

ag.h

@@ -32,6 +32,7 @@ namespace ag
     int getScreenSize(lua_State * L);
     int drawText(lua_State * L);
     int getTextSize(lua_State * L);
+    int drawLine(lua_State * L);
 
     int createBox(lua_State * L);
     int createStaticBox(lua_State * L);

tests/bowling.lua

@@ -52,7 +52,9 @@ function key_down_event(key)
     end
 end
 
---function update_overlay_event(width, height)
+function update_overlay_event(width, height)
---    local tw, th = ag.getTextSize("Hi there", 18)
+    local tw, th = ag.getTextSize("Hi there", 18)
---    ag.drawText("Hi there", 1, 1, 1, 18, width - tw - 4, height - th - 4)
+    ag.drawText("Hi there", 1, 1, 1, 18, width - tw - 4, height - th - 4)
---end
+    ag.drawLine(1, 0, 0.3, 10, 10, 40, 60)
+    ag.drawLine(1, 0.7, 1, 50, 10, 100, 60, 5)
+end