不叫b2Draw子類的成員函數

Question

我試圖創建一個最小的測試用例約Box2D的另一個問題，但我不能引起我的自定義抽屜的成員函數被調用：

#include <iostream> 

#include "Box2D/Box2D.h" 

class DebugDrawer : public b2Draw 
{ 
public: 
    DebugDrawer() { 
     AppendFlags(b2Draw::e_shapeBit); 
     AppendFlags(b2Draw::e_jointBit); 
     AppendFlags(b2Draw::e_aabbBit); 
     AppendFlags(b2Draw::e_pairBit); 
     AppendFlags(b2Draw::e_centerOfMassBit); 
    } 

    void DrawPolygon(const b2Vec2* vertices, int32 vertexCount, const b2Color&) 
    { 
     for (int vertex = 0; vertex < vertexCount; ++vertex) { 
      b2Vec2 vec = vertices[vertex]; 
      std::cout << "DrawPolygon" << "vertex" << vertex << "x" << vec.x << "y" << vec.y; 
     } 
    } 

    void DrawSolidPolygon(const b2Vec2* vertices, int32 vertexCount, const b2Color&) 
    { 
     for (int vertex = 0; vertex < vertexCount; ++vertex) { 
      b2Vec2 vec = vertices[vertex]; 
      std::cout << "DrawSolidPolygon" << "vertex" << vertex << "x" << vec.x << "y" << vec.y; 
     } 
    } 

    void DrawCircle(const b2Vec2& center, float32 radius, const b2Color&) 
    { 
     std::cout << "DrawCircle" << "x" << center.x << "y" << center.y << "radius" << radius; 
    } 

    void DrawSolidCircle(const b2Vec2& center, float32 radius, const b2Vec2&, const b2Color&) { 
     std::cout << "DrawSolidCircle" << "x" << center.x << "y" << center.y << "radius" << radius; 
    } 

    void DrawSegment(const b2Vec2& p1, const b2Vec2& p2, const b2Color&) { 
     std::cout << "DrawSegment" << "p1.x" << p1.x << "p1.y" << p1.y << "p2.x" << p2.x << "p2.y" << p2.y; 
    } 

    void DrawTransform(const b2Transform& xf) { 
     std::cout << "DrawTransform" << "x" << xf.p.x << "y" << xf.p.y << "angle" << xf.q.GetAngle(); 
    } 
}; 

int main(int argc, char** argv) 
{ 
    b2World world(b2Vec2(0.0f, 0.0f)); 
    DebugDrawer debugDrawer; 
    world.SetDebugDraw(&debugDrawer); 

    // body 
    b2BodyDef bd; 
    bd.type = b2_dynamicBody; 
    bd.position = b2Vec2(0, 0); 
    b2Body *body = world.CreateBody(&bd); 
    // shape 
    b2CircleShape shape; 
    shape.m_radius = 1.0f; 
    // fixture 
    b2FixtureDef fd; 
    fd.shape = &shape; 
    fd.density = 1.0f; 
    body->CreateFixture(&fd); 

    world.Step(1.0f/120.0f, 8, 3); 

    return 0; 
} 

我我曾嘗試多次致電Step()，迫使身體保持清醒，等等。我錯過了什麼？

Answer 1

我想你明確需要撥打world.DrawDebugData()。

另外，您是否知道您可以撥打SetFlags(a | b | c);而不是AppendFlags(a); AppendFlags(b); AppendFlags(c);？