Camera animation

import { CameraType } from '@antv/g';
import { Renderer as WebGLRenderer } from '@antv/g-webgl';
import { Plugin as ThreeDPlugin, DirectionalLight } from '@antv/g-plugin-3d';
import { Plugin as ControlPlugin } from '@antv/g-plugin-control';
import { Runtime, corelib, extend } from '@antv/g2';
import { threedlib } from '@antv/g2-extension-3d';

function cameraButton(chart) {
  const node = chart.getContainer();
  const button = document.createElement('button');
  button.textContent = 'Reset camera to default';
  node.insertBefore(button, node.childNodes[0]);

  const { canvas } = chart.getContext();
  const camera = canvas.getCamera();
  camera.createLandmark('default', {
    position: [320, 240, 500],
    focalPoint: [320, 240, 0],
    zoom: 1,
  });

  button.onclick = () => {
    camera.gotoLandmark('default', {
      duration: 300,
      easing: 'linear',
    });
  };
}

// 添加图例
function legendColor(chart) {
  // 创建 Legend 并且挂在图例
  const node = chart.getContainer();
  const legend = document.createElement('div');
  legend.style.display = 'flex';
  node.insertBefore(legend, node.childNodes[0]);

  // 创建并挂载 Items
  const { color: scale } = chart.getScale();
  const { domain } = scale.getOptions();
  const items = domain.map((value) => {
    const item = document.createElement('div');
    const color = scale.map(value);
    item.style.marginLeft = '1em';
    item.innerHTML = `
    <span style="
      background-color:${color};
      display:inline-block;
      width:10px;
      height:10px;"
    ></span>
    <span>${value}</span>
    `;
    return item;
  });
  items.forEach((d) => legend.append(d));

  // 监听事件
  const selectedValues = [...domain];
  const options = chart.options();
  for (let i = 0; i < items.length; i++) {
    const item = items[i];
    const value = domain[i];
    item.style.cursor = 'pointer';
    item.onclick = () => {
      const index = selectedValues.indexOf(value);
      if (index !== -1) {
        selectedValues.splice(index, 1);
        item.style.opacity = 0.5;
      } else {
        selectedValues.push(value);
        item.style.opacity = 1;
      }
      changeColor(selectedValues);
    };
  }

  // 重新渲染视图
  function changeColor(value) {
    const { transform = [] } = options;
    const newTransform = [{ type: 'filter', color: { value } }, ...transform];
    chart.options({
      ...options,
      transform: newTransform, // 指定新的 transform
      scale: { color: { domain } },
    });
    chart.render(); // 重新渲染图表
  }
}

// Create a WebGL renderer.
const renderer = new WebGLRenderer();
renderer.registerPlugin(new ThreeDPlugin());
renderer.registerPlugin(new ControlPlugin());

// Customize our own Chart with threedlib.
const Chart = extend(Runtime, { ...corelib(), ...threedlib() });
const chart = new Chart({
  container: 'container',
  renderer,
  depth: 400, // Define the depth of chart.
});

chart.options({
  type: 'point3D',
  data: {
    type: 'fetch',
    value:
      'https://gw.alipayobjects.com/os/bmw-prod/2c813e2d-2276-40b9-a9af-cf0a0fb7e942.csv',
  },
  encode: {
    x: 'Horsepower',
    y: 'Miles_per_Gallon',
    z: 'Weight_in_lbs',
    color: 'Origin',
  },
  coordinate: { type: 'cartesian3D' },
  scale: { x: { nice: true }, y: { nice: true }, z: { nice: true } },
  legend: false,
  axis: {
    x: { gridLineWidth: 2 },
    y: { gridLineWidth: 2, titleBillboardRotation: -Math.PI / 2 },
    z: { gridLineWidth: 2 },
  },
});

chart.render().then(() => {
  legendColor(chart);
  cameraButton(chart);

  const { canvas } = chart.getContext();
  const camera = canvas.getCamera();
  // Use perspective projection mode.
  camera.setPerspective(0.1, 5000, 45, 640 / 480);
  camera.setType(CameraType.ORBITING);

  // Add a directional light into scene.
  const light = new DirectionalLight({
    style: {
      intensity: 3,
      fill: 'white',
      direction: [-1, 0, 1],
    },
  });
  canvas.appendChild(light);
});