How to make a 2D Game

2D Movement in Unity

<关于2D碰撞的一些优化设置>

Rigidbody2D-Collision Detection

• Discrete

GameObjects with Rigidbody 2Ds and Collider 2Ds can overlap or pass through each other during a physics update

• Continuous

GameObjects with Rigidbody 2Ds and Collider 2Ds do not pass through each other during an update

Physics Material 2D

• Friction
• Bounciness

// CharacterController2D.cs

FixedUpdate()
{
    判断角色是否落地：
    在角色脚下新建一个EmptyObject, 通过Physics2D.OverlapCircleAll方法检测有什么跟角色的脚底发生了碰撞。
    如果发生碰撞的不是gameObject, 那么认定角色在地面上。
}

Move()
{
    如果角色在蹲着，判断是否可以站起来：
    
    可以控制player的条件是：player在地面上或者允许player在空中移动
    如果player在蹲着，那么降低移动速度

}

Flip()
{
    通过让palyer的localscale的X取负数来实现左右朝向的反转
}