# FrustumGeometry、 FrustumOutlineGeometry

  • vc-geometry-frustum 组件用于加载视锥体。
  • vc-geometry-outline-frustum 组件用于加载视锥体轮廓。
  • 需要作为 vc-instance-geometry 的子组件使用，可以挂载到 vc-primitive。

# 示例

# 加载视锥体

# 预览

收起 
  <template>
    <div class="viewer">
      <vc-viewer @ready="ready" @LEFT_CLICK="LEFT_CLICK">
        <vc-primitive :appearance="appearance">
          <vc-instance-geometry :geometry.sync="geometry" :attributes="attributes">
            <vc-geometry-frustum
              ref="frustum"
              :frustum="frustum"
              :origin="origin"
              :orientation="orientation"
              :vertexFormat="vertexFormat"
            ></vc-geometry-frustum>
          </vc-instance-geometry>
        </vc-primitive>
        <vc-primitive :appearance="appearance">
          <vc-instance-geometry :attributes="attributes">
            <vc-geometry-outline-frustum
              ref="frustumOutline"
              :frustum="frustum"
              :origin="originOutline"
              :orientation="orientation"
            ></vc-geometry-outline-frustum>
          </vc-instance-geometry>
        </vc-primitive>
      </vc-viewer>
    </div>
  </template>

  <script>
    export default {
      data() {
        return {
          appearance: null,
          geometry: null,
          attributes: null,
          vertexFormat: null,
          orientation: { x: 0, y: 0, z: 0, w: 1},
          frustum: null,
          origin: { lng: 105, lat: 35 },
          originOutline: { lng: 110, lat: 35 }
        }
      },
      mounted () {
        Promise.all([
          this.$refs.frustum.createPromise,
          this.$refs.frustumOutline.createPromise,
        ]).then(instances => {
          console.log('All geometries are loaded.')
          const boundingSphereUnion = instances.reduce((prev, cur) => {
            const geometry = cur.cesiumObject.constructor.createGeometry(cur.cesiumObject)
            const boundingSphere = cur.vm.$parent.modelMatrix
              ? Cesium.BoundingSphere.transform(geometry.boundingSphere, cur.vm.$parent.modelMatrix)
              : geometry.boundingSphere
            return prev === null ? boundingSphere : Cesium.BoundingSphere.union(prev, boundingSphere)
          }, null)
          instances[0].viewer.scene.camera.flyToBoundingSphere(boundingSphereUnion)
        })
      },
      methods: {
        ready({ Cesium, viewer }) {
          this.viewer = viewer
          const { PerInstanceColorAppearance, Cartesian3, ColorGeometryInstanceAttribute, PerspectiveFrustum, Quaternion } = Cesium
          this.appearance = new PerInstanceColorAppearance({
            flat : true
          })
          this.vertexFormat = PerInstanceColorAppearance.VERTEX_FORMAT
          this.attributes = {
            color: new ColorGeometryInstanceAttribute(Math.random(), Math.random(), Math.random(), 0.5)
          }
          this.frustum = new PerspectiveFrustum({
            fov: Cesium.Math.toRadians(30.0),
            aspectRatio: 1920.0 / 1080.0,
            near: 1.0,
            far: 500000
          })
        },
        LEFT_CLICK(movement) {
          const feature = this.viewer.scene.pick(movement.position)
          console.log(feature)
        }
      }
    }
  </script>

# 属性

# vc-geometry-frustum

属性名 类型 默认值 描述
frustum Object optional 指定视锥体参数。
origin Object optional 指定视锥体原点。
orientation Object optional 指定视锥体旋转参数。
vertexFormat Object optional 指定视锥体顶点渲染方式。

# vc-geometry-outline-frustum

属性名 类型 默认值 描述
frustum Object optional 指定视锥体参数。
origin Object optional 指定视锥体原点。
orientation Object optional 指定视锥体旋转参数。

参考官方文档：FrustumGeometry (opens new window)、 FrustumOutlineGeometry (opens new window)

# 事件

事件名 参数 描述
ready {Cesium, viewer, cesiumObject} 该组件渲染完毕时触发，返回 Cesium 类, viewer 实例，以及当前组件的 cesiumObject。

← vc-geometry-plane →