Question

JavaScript => static function CircleCast(origin: Vector2, radius: float, direction: Vector2, distance: float = Mathf.Infinity, layerMask: int = DefaultRaycastLayers, minDepth: float = -Mathf.Infinity, maxDepth: float = Mathf.Infinity): RaycastHit2D;
C# => static RaycastHit2D CircleCast(Vector2 origin, float radius, Vector2 direction, float distance = Mathf.Infinity, int layerMask = DefaultRaycastLayers, float minDepth = -Mathf.Infinity, float maxDepth = Mathf.Infinity);

Parameters 参数

origin	The point in 2D space where the shape originates. 在2D空间中，形状的发源点。
radius	The radius of the shape. 形状的半径。
direction	Vector representing the direction of the shape. 代表形状方向的向量。
distance	Maximum distance over which to cast the shape. 形状投射的最大距离。
layerMask	Filter to detect Colliders only on certain layers. 只在某些层过滤检测碰撞器。
minDepth	Only include objects with a Z coordinate (depth) greater than this value. 只包括Z坐标(深度)大于这个值的对象。
maxDepth	Only include objects with a Z coordinate (depth) less than this value. 只包括Z坐标(深度)小于这个值的对象。

Returns 返回值

RaycastHit2D The cast results returned.
RaycastHit2D 返回投射结果。

Description 描述

Casts a circle against colliders in the scene, returning the first collider to contact with it.
对场景内的碰撞器们投射出一个圆形，返回投射接触到的第一个碰撞器。

A CircleCast is conceptually like dragging a circle through the scene in a particular direction. Any object making contact with the box can be detected and reported.
圆形投射从概念上说类似于在场景中沿一个特定的方向拖动一个圆形。任何物体接触到box（这里box可能是官方复制粘贴错了，应该是circle圆形）会被检测到并报告。

This function returns a RaycastHit2D object with a reference to the collider that is hit by the box (the collider property of the result will be NULL if nothing was hit). The layerMask can be used to detect objects selectively only on certain layers (this allows you to apply the detection only to enemy characters, for example).
这个函数返回一个RaycastHit2D类型的对象，这个对象引用了被投射碰到的碰撞器（如果投射没碰到任何东西，返回结果的碰撞器属性会空）。图层遮罩可以用于指定检测特定某些图层的对象（比如：这允许您设置检测只适用于敌人角色）。

The returned RaycastHit2D returns both the point and normal of the contact where the circle would touch the collider. It also returns the centroid where the circle would be positioned for it to contact at that point.
返回的RaycastHit2D类型内包含了投射圆形接触到碰撞器的接触点和法线信息。它还返回圆形被定位在接触点时的中心点。

See Also: LayerMask class, RaycastHit2D class, CircleCastAll, CircleCastNonAlloc, DefaultRaycastLayers, IgnoreRaycastLayer, raycastsHitTriggers.