0 环境

vs: vs2012
box2d: Box2D_v2.1.2

1 得到box2d编译版本

可以参考：
https://blog.****.net/sty945/article/details/83823976

现在我们得到一个可以用vs2012打开的box2d版本，用vs2012打开如下图所示：

2 运行Testbed的项目

将testbed项目设置成启动项目，然后F7编译， Ctrl+F5运行就可以得到如下界面：

我们可以做一些演示练习

3 基于Testbed项目编写程序

推荐一个box2d教程：
http://ohcoder.com/blog/categories/box2d-tutorials/

我们如何编写自己的程序呢？
在vs2012中直接添加文件是不对的，添加文件只会添加到build目录下，必须要和原始文件在同一目录下才可以，以下是我采用的方法：

3.1 采用vscode打开源代码

路径是…\Box2D_v2.1.2\Box2D文件夹，会得到如下的界面：

3.2 打开testbed文件夹

3.3 创建测试

Testbed/Tests文件夹下面，添加自己创建的.h头文件，如创建一个FooTest.h，写入如下内容：

#ifndef FOO_TEST_H
#define FOO_TEST_H

#define DEGTORAD 0.0174532925199432957f
#define RADTODEG 57.295779513082320876f

class FooTest: public Test
{
    public:
        b2Body* dynamicBody;
        FooTest()
		{
			b2BodyDef myBodyDef;

            myBodyDef.type = b2_dynamicBody;
            //start 10 units further to the right, 20 units higher
            myBodyDef.position.Set(0, 20);
            myBodyDef.angle = 0;
            // b2Body* dynamicBody = m_world->CreateBody(&myBodyDef);
            dynamicBody = m_world->CreateBody(&myBodyDef);

            b2PolygonShape boxShape;
            boxShape.SetAsBox(2, 1);
            b2FixtureDef boxFixtureDef;
            boxFixtureDef.shape = &boxShape;
            boxFixtureDef.density = 1;

            dynamicBody->CreateFixture(&boxFixtureDef);

            //change the starting position and angle
            dynamicBody->SetTransform(b2Vec2(10, 20), 1);

            // set the linear velocity and angular velocity of the body
            dynamicBody->SetLinearVelocity(b2Vec2(-5, 5));
            dynamicBody->SetAngularVelocity(-90 * DEGTORAD);

            //static Bodies
            myBodyDef.type = b2_staticBody;
            myBodyDef.position.Set(0, 10);
            b2Body* staticBody = m_world->CreateBody(&myBodyDef);
            staticBody->CreateFixture(&boxFixtureDef);

            //kinematic body
            myBodyDef.type = b2_kinematicBody;
            myBodyDef.position.Set(-18, 11);
            b2Body* kinematicBody = m_world->CreateBody(&myBodyDef);
            kinematicBody->CreateFixture(&boxFixtureDef);
            kinematicBody->SetLinearVelocity(b2Vec2(1, 0));
            kinematicBody->SetAngularVelocity(360 * DEGTORAD);


		};
        void Step(Settings* setttings)
        {
            Test::Step(setttings);
            m_debugDraw.DrawString(5, m_textLine, "now we have a foo test");
            m_textLine += 15;

            b2Vec2 pos = dynamicBody->GetPosition();
            float angle = dynamicBody->GetAngle();
            b2Vec2 vel = dynamicBody->GetLinearVelocity();
            float angularvel = dynamicBody->GetAngularVelocity();
            m_debugDraw.DrawString(5, m_textLine, "Position:%.3f,%.3f Angle:%.3f", pos.x, pos.y, angle*RADTODEG);
            m_textLine += 15;
            m_debugDraw.DrawString(5, m_textLine, "Veloctiy:%.3f, %.3f Angular velocity:%.3f", vel.x, vel.y, angularvel * RADTODEG);
            m_textLine += 15;

            for (b2Body* b = m_world->GetBodyList(); b; b = b->GetNext())
            {
                b2Vec2 pos1 = b->GetPosition();
                m_debugDraw.DrawString(5, m_textLine, "Position:%.3f,%.3f", pos1.x, pos1.y);
                m_textLine += 15;
            }

        }

        static Test* Create()
        {
            return new FooTest;
        }
};

#endif

然后在同一目录下的TestEntries.cpp文件添加如下两行代码：

#include "FooTest.h"

    {"Foo test", FooTest::Create},

3.4 运行测试

在vs2012中编译运行，会出现如下界面：

第一个演示的就是我们刚才编写的程序。
基于此就可以根据教程：
http://ohcoder.com/blog/categories/box2d-tutorials/
基于学习Box2D了