Method updateDebugDisplay

Components/Paging/src/OgreGrid2DPageStrategy.cpp:367–443

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    }
    //---------------------------------------------------------------------
    void Grid2DPageStrategy::updateDebugDisplay(Page* p, SceneNode* sn)
    {
        uint8 dbglvl = mManager->getDebugDisplayLevel();
        if (dbglvl)
        {
            // we could try to avoid updating the geometry every time here, but this 
            // wouldn't easily deal with paging parameter changes. There shouldn't 
            // be that many pages anyway, and this is debug after all, so update every time
            int32 x, y;
            Grid2DPageStrategyData* stratData = static_cast<Grid2DPageStrategyData*>(
                p->getParentSection()->getStrategyData());
            stratData->calculateCell(p->getID(), &x, &y);

            Grid2DPageStrategyData* data = static_cast<Grid2DPageStrategyData*>(p->getParentSection()->getStrategyData());

            // Determine our centre point, we'll anchor here
            // Note that world points are initialised to ZERO since only 2 dimensions
            // are updated by the grid data (we could display this grid anywhere)
            Vector2 gridMidPoint;
            Vector3 worldMidPoint = Vector3::ZERO;
            data->getMidPointGridSpace(x, y, gridMidPoint);
            data->convertGridToWorldSpace(gridMidPoint, worldMidPoint);

            sn->setPosition(worldMidPoint);

            Vector2 gridCorners[4];
            Vector3 worldCorners[4];

            data->getCornersGridSpace(x, y, gridCorners);
            for (int i = 0; i < 4; ++i)
            {
                worldCorners[i] = Vector3::ZERO;
                data->convertGridToWorldSpace(gridCorners[i], worldCorners[i]);
                // make relative to mid point
                worldCorners[i] -= worldMidPoint;
            }

            String matName = "Ogre/G2D/Debug";
            MaterialPtr mat = MaterialManager::getSingleton().getByName(matName);
            if (!mat)
            {
                mat = MaterialManager::getSingleton().create(matName, ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
                Pass* pass = mat->getTechnique(0)->getPass(0);
                pass->setLightingEnabled(false);
                pass->setVertexColourTracking(TVC_AMBIENT);
                pass->setDepthWriteEnabled(false);
                mat->load();
            }


            ManualObject* mo = 0;
            if (sn->numAttachedObjects() == 0)
            {
                mo = p->getParentSection()->getSceneManager()->createManualObject();
                mo->begin(matName, RenderOperation::OT_LINE_STRIP);
            }
            else
            {