Let's make 16 games in C++(十六)：Volleyball

1、首先配置Box2D的VS环境

①在官网或GitHub上下载Box2D的源码，http://www.box2d.org，https://github.com/erincatto/Box2D

②在官网下载premake，https://premake.github.io/

③将下载好的premake.exe放入解压好的Box2D文件夹内（只是为了方便编译，查看帮助可以了解）

④生成工程文件

⑤打开Build工程文件，设置Box2D为启动项，生成解决方案

错误 MSB8036 找不到 Windows SDK 版本8.1。

 

C1083: 无法打开包括文件: “stddef.h”: No such file or directory

vc++目录-->包含目录下拉条点击编辑，增加了路径：C:\Program Files (x86)\Windows Kits\10\Include\10.0.17763.0\ucrt

⑥把生成的Box2D.lib和Box2D文件夹分别放入新建的lib和include文件夹

⑦此时Box2D已经配置完成。只需要在工程中想SFML一样添加Box2D就可以使用。

2、准备游戏需要的背景图

3、渲染一个800x600的屏幕

#include
#includeusing namespace sf;const float SCALE = 30.f;
const float DEG = 57.29577f;b2Vec2 Gravity(0.f, 9.8f);
b2World World(Gravity);int main()
{RenderWindow window(VideoMode(800, 600), "Volleyball Game!");window.setFramerateLimit(60);Texture t1;Texture t2;t1.loadFromFile("./Resources/images/background.PNG");t2.loadFromFile("./Resources/images/ball.png");Sprite sBackground(t1);Sprite sBall(t2);sBall.setOrigin(32, 32);//box2db2PolygonShape shape;shape.SetAsBox(30 / SCALE, 30 / SCALE);b2BodyDef bdef;bdef.type = b2_dynamicBody;//ballbdef.position.Set(5, 1);b2CircleShape circle;circle.m_radius = 32 / SCALE;b2Body *b = World.CreateBody(&bdef);b2FixtureDef fdef;fdef.shape = &circle;fdef.restitution = 0.95;fdef.density = 0.2;b->CreateFixture(&fdef);b->SetUserData("ball");while (window.isOpen()){Event e;while (window.pollEvent(e)){if (e.type == Event::Closed){window.close();}}World.Step(1 / 60.f, 8, 3);//Drawwindow.draw(sBackground);for (b2Body* it = World.GetBodyList(); it != 0; it = it->GetNext()){b2Vec2 pos = it->GetPosition();float angle = it->GetAngle();if (it->GetUserData() == "ball"){sBall.setPosition(pos.x*SCALE, pos.y*SCALE);sBall.setRotation(angle*DEG);window.draw(sBall);}}window.display();}return 0;
}

4、添加玩家完善游戏逻辑

#include
#includeusing namespace sf;const float SCALE = 30.f;
const float DEG = 57.29577f;b2Vec2 Gravity(0.f, 9.8f);
b2World World(Gravity);void setWall(int x, int y, int w, int h)
{b2PolygonShape gr;gr.SetAsBox(w / SCALE, h / SCALE);b2BodyDef bdef;bdef.position.Set(x / SCALE, y / SCALE);b2Body * b_ground = World.CreateBody(&bdef);b_ground->CreateFixture(&gr, 1);
}int main()
{RenderWindow window(VideoMode(800, 600), "Volleyball Game!");window.setFramerateLimit(60);Texture t1;Texture t2;Texture t3;t1.loadFromFile("./Resources/images/background.PNG");t2.loadFromFile("./Resources/images/ball.png");t3.loadFromFile("./Resources/images/blobby.png");t1.setSmooth(true);t2.setSmooth(true);t3.setSmooth(true);Sprite sBackground(t1);Sprite sBall(t2);Sprite sPlayer(t3);sPlayer.setOrigin(75 / 2, 90 / 2);sBall.setOrigin(32, 32);//box2dsetWall(400, 520, 2000, 10);setWall(400, 450, 10, 170);setWall(0, 0, 10, 2000);setWall(800, 0, 10, 2000);b2PolygonShape shape;shape.SetAsBox(30 / SCALE, 30 / SCALE);b2BodyDef bdef;bdef.type = b2_dynamicBody;//playersb2Body *pBody[2];for (int i = 0; i < 2; i++) {bdef.position.Set(20 * i, 2);b2CircleShape circle;circle.m_radius = 32 / SCALE;circle.m_p.Set(0, 13 / SCALE);pBody[i] = World.CreateBody(&bdef);pBody[i]->CreateFixture(&circle, 5);circle.m_radius = 25 / SCALE;circle.m_p.Set(0, -20 / SCALE);pBody[i]->CreateFixture(&circle, 5);pBody[i]->SetFixedRotation(true);}pBody[0]->SetUserData("player1");pBody[1]->SetUserData("player2");//ballbdef.position.Set(5, 1);b2CircleShape circle;circle.m_radius = 32 / SCALE;b2Body *b = World.CreateBody(&bdef);b2FixtureDef fdef;fdef.shape = &circle;fdef.restitution = 0.95;fdef.density = 0.2;b->CreateFixture(&fdef);b->SetUserData("ball");bool onGround = 0;while (window.isOpen()){Event e;while (window.pollEvent(e)){if (e.type == Event::Closed){window.close();}}for (int n = 0; n < 2; n++){World.Step(1 / 60.f, 8, 3);}//player1 b2Vec2 pos = pBody[0]->GetPosition();b2Vec2 vel = pBody[0]->GetLinearVelocity();if (Keyboard::isKeyPressed(Keyboard::Right)){vel.x = 5;}if (Keyboard::isKeyPressed(Keyboard::Left)){vel.x = -5;}if (Keyboard::isKeyPressed(Keyboard::Up)){if (pos.y*SCALE >= 463){vel.y = -13;}}if (!Keyboard::isKeyPressed(Keyboard::Right)){if (!Keyboard::isKeyPressed(Keyboard::Left)){vel.x = 0;}}pBody[0]->SetLinearVelocity(vel);//player2 pos = pBody[1]->GetPosition();vel = pBody[1]->GetLinearVelocity();if (Keyboard::isKeyPressed(Keyboard::D)){vel.x = 5;}if (Keyboard::isKeyPressed(Keyboard::A)){vel.x = -5;}if (Keyboard::isKeyPressed(Keyboard::W)){if (pos.y*SCALE >= 463){vel.y = -13;}}if (!Keyboard::isKeyPressed(Keyboard::D)){if (!Keyboard::isKeyPressed(Keyboard::A)){vel.x = 0;}}pBody[1]->SetLinearVelocity(vel);//ball max speedvel = b->GetLinearVelocity();if (vel.Length() > 15){b->SetLinearVelocity(15 / vel.Length() * vel);}//Drawwindow.draw(sBackground);for (b2Body* it = World.GetBodyList(); it != 0; it = it->GetNext()){b2Vec2 pos = it->GetPosition();float angle = it->GetAngle();if(it->GetUserData() == "player1"){sPlayer.setPosition(pos.x*SCALE, pos.y*SCALE);sPlayer.setRotation(angle*DEG);sPlayer.setColor(Color::Red);window.draw(sPlayer);}if (it->GetUserData() == "player2"){sPlayer.setPosition(pos.x*SCALE, pos.y*SCALE);sPlayer.setRotation(angle*DEG);sPlayer.setColor(Color::Green);window.draw(sPlayer);}if (it->GetUserData() == "ball"){sBall.setPosition(pos.x*SCALE, pos.y*SCALE);sBall.setRotation(angle*DEG);window.draw(sBall);}}window.display();}return 0;
}

结果图：

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