Leaflet Map Circle-用于在地图上绘制圆形叠加层的类扩展了环标记

It’s an approximation and starts to diverge from a real circle closer to poles (due to projection distortion).

这是一个近似值，并开始偏离靠近极点的真实圆（由于投影失真）。

Usage example

用法示例

L.circle([50.5, 30.5], {radius: 200}).addTo(map);

Creation

Factory	Description
`L.circle(<LatLng> latlng, <Circle options> options?)`	Instantiates a circle object given a geographical point, and an options object which contains the circle radius. 实例化给定地理点的圆对象，以及包含圆半径的选项对象。
`L.circle(<LatLng> latlng, <Number> radius, <Circle options> options?)`	Obsolete way of instantiating a circle, for compatibility with 0.7.x code. Do not use in new applications or plugins. 过时的实例化圆圈的方式，以便与 0.7.x 代码兼容。请勿在新的应用程序或插件中使用。

Options

Option	Type	Default	Description
`radius`	`Number`		Radius of the circle, in meters. 圆的半径，以米为单位。

▶ Options inherited from Path

从路径继承的选项

Option	Type	Default	Description
`stroke`	`Boolean`	`true`	Whether to draw stroke along the path. Set it to `false` to disable borders on polygons or circles. 是否沿路径绘制描边。将其设置为 false 可禁用多边形或圆上的边框。
`color`	`String`	`'#3388ff'`	Stroke color 描边颜色
`weight`	`Number`	`3`	Stroke width in pixels 描边宽度（以像素为单位）
`opacity`	`Number`	`1.0`	Stroke opacity 描边不透明度
`lineCap`	`String`	`'round'`	A string that defines shape to be used at the end of the stroke. 一个字符串，用于定义要在描边末尾使用的形状。
`lineJoin`	`String`	`'round'`	A string that defines shape to be used at the corners of the stroke. 一个字符串，用于定义要在描边的角上使用的形状。
`dashArray`	`String`	`null`	A string that defines the stroke dash pattern. Doesn’t work on `Canvas`-powered layers in some old browsers. 定义描边虚线图案的字符串。在某些旧浏览器中，不适用于由 Canvas 提供支持的图层。
`dashOffset`	`String`	`null`	A string that defines the distance into the dash pattern to start the dash. Doesn’t work on `Canvas`-powered layers in some old browsers. 一个字符串，用于定义到破折号模式中开始破折号的距离。在某些旧浏览器中，不适用于由 Canvas 提供支持的图层。
`fill`	`Boolean`	`depends`	Whether to fill the path with color. Set it to `false` to disable filling on polygons or circles. 是否用颜色填充路径。将其设置为 false 可禁用多边形或圆的填充。
`fillColor`	`String`	`*`	Fill color. Defaults to the value of the `color` option 填充颜色。默认为颜色选项的值
`fillOpacity`	`Number`	`0.2`	Fill opacity. 填充不透明度。
`fillRule`	`String`	`'evenodd'`	A string that defines how the inside of a shape is determined. 定义如何确定形状内部的字符串。
`bubblingMouseEvents`	`Boolean`	`true`	When `true`, a mouse event on this path will trigger the same event on the map (unless `L.DomEvent.stopPropagation` is used). 如果为 true，则此路径上的鼠标事件将在地图上触发相同的事件（除非使用 L.DomEvent.stop 传播）。
`renderer`	`Renderer`		Use this specific instance of `Renderer` for this path. Takes precedence over the map’s default renderer. 将此特定呈现器实例用于此路径。优先于地图的默认渲染器。
`className`	`String`	`null`	Custom class name set on an element. Only for SVG renderer. 在元素上设置的自定义类名。仅适用于 SVG 渲染器。

▶ Options inherited from Interactive layer

从交互式图层继承的选项

Option	Type	Default	Description
`interactive`	`Boolean`	`true`	If `false`, the layer will not emit mouse events and will act as a part of the underlying map. 如果为 false，则该图层将不会发出鼠标事件，并将充当基础地图的一部分。

▶ Options inherited from Layer

从图层继承的选项

Option	Type	Default	Description
`pane`	`String`	`'overlayPane'`	By default the layer will be added to the map’s overlay pane. Overriding this option will cause the layer to be placed on another pane by default. 默认情况下，该图层将添加到地图的叠加窗格中。默认情况下，覆盖此选项将导致图层放置在另一个窗格上。
`attribution`	`String`	`null`	String to be shown in the attribution control, e.g. “© OpenStreetMap contributors”. It describes the layer data and is often a legal obligation towards copyright holders and tile providers. 要在归因控件中显示的字符串，例如“©开放街道地图贡献者”。它描述了图层数据，通常是对版权所有者和切片提供商的法律义务。

Events

▶ Events inherited from CircleMarker

从 CircleMarker 继承的事件

Event	Data	Description
`move`	`Event`	Fired when the marker is moved via `setLatLng`. Old and new coordinates are included in event arguments as `oldLatLng`, `latlng`. 当标记通过设置移动时触发。旧坐标和新坐标包含在事件参数中，如旧纬度，拉特朗。

▶ Mouse events inherited from Interactive layer

从交互式图层继承的鼠标事件

Event	Data	Description
`click`	`MouseEvent`	Fired when the user clicks (or taps) the layer. 当用户单击（或点击）图层时触发。
`dblclick`	`MouseEvent`	Fired when the user double-clicks (or double-taps) the layer. 当用户双击（或双击）图层时触发。
`mousedown`	`MouseEvent`	Fired when the user pushes the mouse button on the layer. 当用户按下图层上的鼠标按钮时触发。
`mouseup`	`MouseEvent`	Fired when the user releases the mouse button pushed on the layer. 当用户松开按下图层上的鼠标按钮时触发。
`mouseover`	`MouseEvent`	Fired when the mouse enters the layer. 鼠标进入图层时触发。
`mouseout`	`MouseEvent`	Fired when the mouse leaves the layer. 鼠标离开图层时触发。
`contextmenu`	`MouseEvent`	Fired when the user right-clicks on the layer, prevents default browser context menu from showing if there are listeners on this event. Also fired on mobile when the user holds a single touch for a second (also called long press). 当用户右键单击图层时触发，可防止默认浏览器上下文菜单显示此事件是否有侦听器。当用户按住一次触摸一秒钟（也称为长按）时，也会在移动设备上触发。

▶ Events inherited from Layer

从图层继承的事件

Event	Data	Description
`add`	`Event`	Fired after the layer is added to a map 将图层添加到地图后触发
`remove`	`Event`	Fired after the layer is removed from a map 从地图中移除图层后触发

▶ Popup events inherited from Layer

从图层继承的弹出事件

Event	Data	Description
`popupopen`	`PopupEvent`	Fired when a popup bound to this layer is opened 打开绑定到此图层的弹出窗口时触发
`popupclose`	`PopupEvent`	Fired when a popup bound to this layer is closed 当绑定到此图层的弹出窗口关闭时触发

▶ Tooltip events inherited from Layer

从图层继承的工具提示事件

Event	Data	Description
`tooltipopen`	`TooltipEvent`	Fired when a tooltip bound to this layer is opened. 打开绑定到此图层的工具提示时激发。
`tooltipclose`	`TooltipEvent`	Fired when a tooltip bound to this layer is closed. 当绑定到此层的工具提示关闭时激发。

Methods

Method	Returns	Description
`setRadius(<Number> radius)`	`this`	Sets the radius of a circle. Units are in meters. 设置圆的半径。单位以米为单位。
`getRadius()`	`Number`	Returns the current radius of a circle. Units are in meters. 返回圆的当前半径。单位以米为单位。
`getBounds()`	`LatLngBounds`	Returns the `LatLngBounds` of the path. 返回路径的纬度边界。

▶ Methods inherited from CircleMarker

从圆圈标记继承的方法

Method	Returns	Description
`toGeoJSON(<Number\|false>` `precision?)`	`Object`	Coordinates values are rounded with `formatNum` function with given `precision`. Returns a `GeoJSON` representation of the circle marker (as a GeoJSON `Point` Feature). 坐标值使用具有给定精度的 formatNum 函数进行舍入。返回圆标记的地理 JSON 制图表达（作为地理地理符号点要素）。
`setLatLng(<LatLng>` `latLng)`	`this`	Sets the position of a circle marker to a new location. 将圆标记的位置设置为新位置。
`getLatLng()`	`LatLng`	Returns the current geographical position of the circle marker 返回圆标记的当前地理位置

▶ Methods inherited from Path

从Path继承的方法

Method	Returns	Description
`redraw()`	`this`	Redraws the layer. Sometimes useful after you changed the coordinates that the path uses. 重新绘制图层。有时在更改路径使用的坐标后会很有用。
`setStyle(<Path options> style)`	`this`	Changes the appearance of a Path based on the options in the `Path options` object. 根据路径选项对象中的选项更改路径的外观。
`bringToFront()`	`this`	Brings the layer to the top of all path layers. 将图层置于所有路径图层的顶部。
`bringToBack()`	`this`	Brings the layer to the bottom of all path layers. 将图层置于所有路径图层的底部。

▶ Methods inherited from Layer

从Layer继承的方法

Method	Returns	Description
`addTo(<Map\|LayerGroup> map)`	`this`	Adds the layer to the given map or layer group. 将图层添加到给定地图或图层组。
`remove()`	`this`	Removes the layer from the map it is currently active on. 从当前处于活动状态的地图中删除图层。
`removeFrom(<Map> map)`	`this`	Removes the layer from the given map 从给定地图中删除图层
`removeFrom(<LayerGroup> group)`	`this`	Removes the layer from the given `LayerGroup` 从给定的LayerGroup中删除层
`getPane(<String> name?)`	`HTMLElement`	Returns the `HTMLElement` representing the named pane on the map. If `name` is omitted, returns the pane for this layer. 返回表示地图上命名窗格的HTMLElement。如果省略名称，则返回此层的窗格。
`getAttribution()`	`String`	Used by the `attribution control`, returns the attribution option. 由属性控件使用，返回属性选项。

▶ Popup methods inherited from Layer

从层继承的弹出式方法

Method	Returns	Description
`bindPopup(<String\|HTMLElement` `\|Function\|Popup> content,` `<Popup options> options?)`	`this`	Binds a popup to the layer with the passed `content` and sets up the necessary event listeners. If a `Function` is passed it will receive the layer as the first argument and should return a `String` or `HTMLElement`. 将弹出窗口与传递的内容绑定到层，并设置必要的事件侦听器。如果传递了Function，它将接收层作为第一个参数，并应返回String或HTMLElement。
`unbindPopup()`	`this`	Removes the popup previously bound with `bindPopup`. 删除以前与bindPopup绑定的弹出窗口。
`openPopup(<LatLng> latlng?)`	`this`	Opens the bound popup at the specified `latlng` or at the default popup anchor if no `latlng` is passed. 在指定的latlng处打开绑定弹出窗口，如果未传递latlng，则在默认弹出窗口锚定处打开绑定的弹出窗口。
`closePopup()`	`this`	Closes the popup bound to this layer if it is open. 关闭绑定到此层的弹出窗口（如果已打开）。
`togglePopup()`	`this`	Opens or closes the popup bound to this layer depending on its current state. 根据当前状态打开或关闭绑定到此层的弹出窗口。
`isPopupOpen()`	`boolean`	Returns `true` if the popup bound to this layer is currently open. 如果绑定到此层的弹出窗口当前打开，则返回true。
`setPopupContent(<String\|` `HTMLElement\|Popup> content)`	`this`	Sets the content of the popup bound to this layer. 设置绑定到此层的弹出窗口的内容。
`getPopup()`	`Popup`	Returns the popup bound to this layer. 返回绑定到此层的弹出窗口。

▶ Tooltip methods inherited from Layer

从层继承的工具提示方法

Method	Returns	Description
`bindTooltip(<String\|HTMLElement\|` `Function\|Tooltip> content,` `<Tooltip options> options?)`	`this`	Binds a tooltip to the layer with the passed `content` and sets up the necessary event listeners. If a `Function` is passed it will receive the layer as the first argument and should return a `String` or `HTMLElement`. 将工具提示与传递的内容绑定到层，并设置必要的事件侦听器。如果传递了Function，它将接收层作为第一个参数，并应返回String或HTMLElement。
`unbindTooltip()`	`this`	Removes the tooltip previously bound with `bindTooltip`. 删除以前与bindTooltip绑定的工具提示。
`openTooltip(<LatLng> latlng?)`	`this`	Opens the bound tooltip at the specified `latlng` or at the default tooltip anchor if no `latlng` is passed. 在指定的latlng处打开绑定工具提示，如果未传递latlng，则在默认工具提示锚定处打开绑定的工具提示。
`closeTooltip()`	`this`	Closes the tooltip bound to this layer if it is open. 如果绑定到此层的工具提示处于打开状态，则将其关闭。
`toggleTooltip()`	`this`	Opens or closes the tooltip bound to this layer depending on its current state. 根据当前状态打开或关闭绑定到此层的工具提示。
`isTooltipOpen()`	`boolean`	Returns `true` if the tooltip bound to this layer is currently open. 如果绑定到此层的工具提示当前处于打开状态，则返回true。
`setTooltipContent(<String\|` `HTMLElement\|Tooltip> content)`	`this`	Sets the content of the tooltip bound to this layer. 设置绑定到此层的工具提示的内容。
`getTooltip()`	`Tooltip`	Returns the tooltip bound to this layer. 返回绑定到此层的工具提示。

▶ Methods inherited from Evented

从Evented继承的方法

Method	Returns	Description
`on(<String> type, <Function>` `fn, <Object> context?)`	`this`	Adds a listener function (`fn`) to a particular event type of the object. You can optionally specify the context of the listener (object the this keyword will point to). You can also pass several space-separated types (e.g. `'click dblclick'`). 将侦听器函数（fn）添加到对象的特定事件类型。您可以选择指定侦听器的上下文（this关键字将指向的对象）。您还可以传递几个空格分隔的类型（例如“click dblclick”）。
`on(<Object> eventMap)`	`this`	Adds a set of type/listener pairs, e.g. `{click: onClick, mousemove: onMouseMove}` 添加一组类型/侦听器对，例如{click:onClick、mousemove:onMouseMove}
`off(<String> type, <Function>` `fn?, <Object> context?)`	`this`	Removes a previously added listener function. If no function is specified, it will remove all the listeners of that particular event from the object. Note that if you passed a custom context to `on`, you must pass the same context to `off` in order to remove the listener. 删除以前添加的侦听器函数。如果没有指定函数，它将从对象中删除该特定事件的所有侦听器。请注意，如果将自定义上下文传递给on，则必须将同一上下文传递给off才能删除侦听器。
`off(<Object> eventMap)`	`this`	Removes a set of type/listener pairs. 删除一组类型/侦听器对。
`off()`	`this`	Removes all listeners to all events on the object. This includes implicitly attached events.. 删除对象上所有事件的所有侦听器。这包括隐式附加的事件。
`fire(<String> type, <Object>` `data?, <Boolean> propagate?)`	`this`	Fires an event of the specified type. You can optionally provide a data object — the first argument of the listener function will contain its properties. The event can optionally be propagated to event parents. 激发指定类型的事件。您可以选择提供一个数据对象-侦听器函数的第一个参数将包含其属性。可以选择将事件传播到事件父级。
`listens(<String> type,` `<Boolean> propagate?)`	`Boolean`	Returns `true` if a particular event type has any listeners attached to it. The verification can optionally be propagated, it will return `true` if parents have the listener attached to it. 如果特定事件类型附加了任何侦听器，则返回true。验证可以选择性地传播，如果父级附加了侦听器，它将返回true。
`once(…)`	`this`	Behaves as `on(…)`, except the listener will only get fired once and then removed. 行为与on（…）相同，但侦听器只会被激发一次，然后被移除。
`addEventParent(<Evented> obj)`	`this`	Adds an event parent – an `Evented` that will receive propagated events 添加事件父级-将接收传播事件的Evented
`removeEventParent(<Evented> obj)`	`this`	Removes an event parent, so it will stop receiving propagated events 删除事件父级，因此它将停止接收传播的事件
`addEventListener(…)`	`this`	Alias to `on(…)`
`removeEventListener(…)`	`this`	Alias to `off(…)`
`clearAllEventListeners(…)`	`this`	Alias to `off()`
`addOneTimeEventListener(…)`	`this`	Alias to `once(…)`
`fireEvent(…)`	`this`	Alias to `fire(…)`
`hasEventListeners(…)`	`Boolean`	Alias to `listens(…)`

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