85 lines
1.7 KiB
C++
85 lines
1.7 KiB
C++
// Copyright (C) 2019 Nomango
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#pragma once
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#include "Circle.h"
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#include "Rect.h"
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#include "Board.h"
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KGE_DECLARE_SMART_PTR(MainScene);
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class MainScene
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: public Scene
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{
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b2World* world_;
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public:
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MainScene()
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{
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// 设置可响应状态, 使场景可以接收到鼠标 Click 消息
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SetResponsible(true);
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// 添加消息监听
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AddListener(Event::Click, MakeClosure(this, &MainScene::Click));
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// 创建物理世界
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world_ = new b2World(b2Vec2(0, 10));
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BoardPtr board = new Board(world_, Size(GetWidth() - 100, 20), Point(GetWidth() / 2, GetHeight() - 50));
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AddChild(board);
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CirclePtr circle = new Circle(world_, Point(320, 240));
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AddChild(circle);
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}
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~MainScene()
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{
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if (world_)
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delete world_;
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}
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void OnUpdate(Duration dt) override
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{
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// 更新 Box2D 世界
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world_->Step(dt.Seconds(), 6, 2);
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// 更新每一个物理对象的位置和旋转角度
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b2Body* body = world_->GetBodyList();
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while (body)
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{
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Node* node = (Node*)body->GetUserData();
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b2Body* next = body->GetNext();
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if (node)
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{
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const b2Vec2& pos = body->GetPosition();
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node->SetPosition(Vec2Convert(pos));
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node->SetRotation(body->GetAngle() * 180.f / math::constants::PI_F);
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// 移除掉落到场景外的物体
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if (node->GetPosition().y > GetHeight() + 50)
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{
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body->SetUserData(0);
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world_->DestroyBody(body);
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node->RemoveFromParent();
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}
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}
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body = next;
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}
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}
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void Click(Event const& evt)
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{
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if (evt.mouse.button == MouseButton::Left)
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{
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CirclePtr circle = new Circle(world_, Point{ evt.mouse.x, evt.mouse.y });
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AddChild(circle);
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}
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else if (evt.mouse.button == MouseButton::Right)
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{
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SquarePtr rect = new Square(world_, Point{ evt.mouse.x, evt.mouse.y });
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AddChild(rect);
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}
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}
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};
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