集成阶段 4a：获取和使用路径

class MyGameLevel
{
public:
    ...         
    void TestPath(Kaim::World* world);
    ...     
};

...

void MyGameLevel::TestPath(Kaim::World* world)
{
    Kaim::ScopedDisplayList displayList(world, Kaim::DisplayList_Enable);
    displayList.InitSingleFrameLifespan("Test Path", "My Game");

    if (m_astarQuery->m_processStatus == Kaim::QueryDone)
    {
        Kaim::AStarQueryResult result = m_astarQuery->GetResult();
        if( result == Kaim::ASTAR_DONE_PATH_FOUND )
        {
            Kaim::Path* resultPath = m_astarQuery->GetPath();
            if( resultPath->GetEdgeCount() == 0 )
                return;

            // Let's fake an object moving on this path
            // in a very basic way.
            static KyFloat32 ratio = 0.0f;
            ratio += 0.00005f;
            if( ratio > 1.0f )
                ratio = 0.0f;
            KyFloat32 positionRatio = ratio * resultPath->GetEdgeCount();
            KyUInt32 currentEdge = (KyUInt32)floorf(positionRatio);
            Kaim::Vec3f edgeStart = resultPath->GetNodePosition(currentEdge);
            Kaim::Vec3f edgeEnd = resultPath->GetNodePosition(currentEdge+1);
            Kaim::Vec3f objectPosition = edgeStart + (positionRatio-currentEdge)*(edgeEnd-edgeStart);

            Kaim::VisualShapeColor shapeColor;
            shapeColor.m_triangleColor = Kaim::VisualColor(255, 255, 0);
            shapeColor.m_lineColor     = Kaim::VisualColor(175, 175, 0);
            displayList.PushArrow(    objectPosition + Kaim::Vec3f(0.0f, 0.0f, 2.0f),
                                    objectPosition,
                                    0.05f, shapeColor);
        }
    }
}