Cesium JS API
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MetadataClassProperty

MetadataClassProperty 是 CesiumJS 中的类,它表示元数据类的一个属性。

语法

new Cesium.MetadataClassProperty(options)

参数:

  • options :一个对象,描述元数据类中的一个属性。

    • id :一个字符串,表示元数据属性的名称。
    • name :一个字符串,表示元数据属性的显示名称。可选,默认为 id
    • description :一个字符串,表示元数据属性的说明。可选,默认为空字符串。
    • type :一个字符串,表示元数据属性的类型。可选,默认为 undefined
    • maxOccurs :一个数字或字符串,表示元数据属性的最大出现次数。可选,默认为 1
    • value :元数据属性的值。可选,默认为 undefined

示例

const soilDataClass = new Cesium.MetadataClass({
  id: 'SoilData',
  name: 'Soil Data',
  classification: 'classification',
  properties: {
    clayContent: new Cesium.MetadataClassProperty({
      id: 'clayContent',
      name: 'Clay Content',
      description: 'The percentage of clay in the soil.',
      type: 'number',
      maxOccurs: 1,
      value: 20
    }),
    sandContent: new Cesium.MetadataClassProperty({
      id: 'sandContent',
      name: 'Sand Content',
      description: 'The percentage of sand in the soil.',
      type: 'number',
      maxOccurs: 1,
      value: 60
    }),
    organicContent: new Cesium.MetadataClassProperty({
      id: 'organicContent',
      name: 'Organic Content',
      description: 'The percentage of organic matter in the soil.',
      type: 'number',
      maxOccurs: 1,
      value: 10
    })
  }
})

在上面的示例中,我们创建了一个名为 SoilData 的元数据类,并定义了三个属性分别为 clayContentsandContentorganicContent。每个属性都是 MetadataClassProperty 的实例对象。

方法

getId()

返回元数据属性的 id

const id = soilDataClass.properties.clayContent.getId()

getName()

返回元数据属性的显示名称 name

const name = soilDataClass.properties.clayContent.getName()

getDescription()

返回元数据属性的说明 description

const desc = soilDataClass.properties.clayContent.getDescription()

getType()

返回元数据属性的类型 type

const type = soilDataClass.properties.clayContent.getType()

getMaxOccurs()

返回元数据属性的最大出现次数 maxOccurs

const maxOccurs = soilDataClass.properties.clayContent.getMaxOccurs()

getValue()

返回元数据属性的值 value

const value = soilDataClass.properties.clayContent.getValue()

setValue(value)

设置元数据属性的值 value

参数:

  • value :元数据属性的值。
soilDataClass.properties.clayContent.setValue(25)

注意事项

元数据属性可以通过 getValue()setValue(value) 方法来获取和设置它的值。如果 maxOccurs 等于 1,则可以使用 getValue()setValue(value) 方法;如果 maxOccurs 大于 1,则可以使用 getValues()setValues(values) 方法。

引用