【Unity开发小技巧】技能伤害区域判定（矩形，圆，三角形，扇形）（二）

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源码地址：unity伤害范围判断_unity2d攻击判定,unity伤害判定-Unity3D代码类资源-优快云下载

一.判断目标点是否在某一圆形区域内

定义圆形

public class Circle {

    public Vector2 Center;
    public float Radius;

    public Circle(Vector2 center, float radius)
    {
        this.Center = center;
        this.Radius = radius;
    }

    public bool Contains( Vector2 point)
    {
        Vector2 vector = point - this.Center;
        return (vector.SqrMagnitude() <= (this.Radius * this.Radius));
    }

    public Vector2 Eval(float t)
    {
        return new Vector2(this.Center.x + (this.Radi