Simple

Point layers support the simple points of sprite mode. Point layers in sprite mode are more efficient and the points always face the camera.

accomplish

Let’s introduce how to draw a simple point layer.

• you canL7Found on the official websiteOnline case

import { Scene, PointLayer } from '@antv/l7';
import { GaodeMap } from '@antv/l7-maps';

const scene = new Scene({
  id: 'map',
  map: new GaodeMap({
    pitch: 20,
    center: [ 120, 20 ],
    zoom: 3
  })
});
scene.on('loaded', () => {
  fetch('https://gw.alipayobjects.com/os/basement_prod/d3564b06-670f-46ea-8edb-842f7010a7c6.json')
    .then(res => res.json())
    .then(data => {
      const pointLayer = new PointLayer({})
        .source(data)
        .shape('simple')
        .size(15)
        .color('mag', mag =>  mag > 4.5 ? '#5B8FF9' : '#5CCEA1';)
        .style({
          opacity: 0.6,
          strokeWidth: 3
        });
      scene.addLayer(pointLayer);
    });
});

shape

Simple point layer useshapeThe parameters are fixed tosimple。

use

• The use of simple point layers behaves the same as general point layers.

• A simple point layer is essentially a sprite map, so a simple point layer always faces the camera (a normal 2D point layer stays facing up)

• 🌟 When the user has no requirements for the orientation of the point layer or the visual effect of the point layer is relatively simple, it is recommended to use a simple point layer as much as possible, which can save a lot of performance

• 🌟 Since the simple point layer is essentially a sprite map, there is a size limit: generally [1, 64], which varies between different devices.

// L7 provides query methods for quick viewing

scene.getPointSizeRange(); // Float32Array - [min, max]