feat: 新增 CanvasLayer demo

examples/point/chart/demo/custom.js

@@ -0,0 +1,140 @@
+import { Scene, CanvasLayer } from '@antv/l7';
+import { GaodeMap } from '@antv/l7-maps';
+let x = 0;
+function draw(option) {
+  const { size, ctx, mapService } = option;
+  const [ width, height ] = size;
+
+  const radius = 30,
+    rectWidth = radius * 2 * window.devicePixelRatio;
+  const rectHeight = rectWidth;
+
+  ctx.clearRect(0, 0, width, height);
+
+  const points = [
+    {
+      lng: 108.544921875,
+      lat: 30.977609093348686,
+      level: 85,
+      color: 'rgba(	220,20,60, 0.6)'
+    },
+    {
+      lng: 110.654296875,
+      lat: 31.090574094954192,
+      level: 75,
+      color: 'rgba(	255,140,0, 0.6)'
+    },
+    {
+      lng: 112.5,
+      lat: 29.80251790576445,
+      level: 65,
+      color: 'rgba(255,165,0, 0.6)'
+    },
+    {
+      lng: 114.78515624999999,
+      lat: 30.64867367928756,
+      level: 40,
+      color: 'rgba(30,144,255, 0.6)'
+    },
+    {
+      lng: 116.49902343749999,
+      lat: 29.84064389983441,
+      level: 50,
+      color: 'rgba(30,144,255, 0.6)'
+    },
+    {
+      lng: 118.21289062499999,
+      lat: 31.16580958786196,
+      level: 20,
+      color: 'rgba(	127,255,0, 0.6)'
+    },
+    {
+      lng: 119.091796875,
+      lat: 32.509761735919426,
+      level: 50,
+      color: 'rgba(30,144,255, 0.6)'
+    },
+    {
+      lng: 121.0693359374999,
+      lat: 31.80289258670676,
+      level: 45,
+      color: 'rgba(30,144,255, 0.6)'
+    }
+  ];
+  ctx.fillStyle = 'rgb(35,75,225)';
+  ctx.font = 'normal small-caps bold 14px arial';
+  ctx.textAlign = 'center';
+  ctx.textBaseline = 'middle';
+
+  points.map(point => {
+    const pixelCenter = mapService.lngLatToContainer([ point.lng, point.lat ]);
+    const rectStartX = pixelCenter.x - radius;
+    const rectStartY = pixelCenter.y - radius;
+
+    ctx.save();
+
+    ctx.fillText(point.level + '%', pixelCenter.x, pixelCenter.y);
+
+    ctx.beginPath();
+    ctx.arc(pixelCenter.x, pixelCenter.y, radius, 0, Math.PI * 2);
+    ctx.fillStyle = 'rgba(135,206,250,0.2)';
+    ctx.closePath();
+    ctx.fill();
+    ctx.clip();
+
+    ctx.beginPath();
+    ctx.fillStyle = point.color;
+    ctx.moveTo(rectStartX, pixelCenter.y);
+
+    const waterheight = rectStartY + ((100 - point.level) / 100) * rectHeight;
+    for (let i = 0; i <= rectWidth; i += 10) {
+      ctx.lineTo(
+        rectStartX + i,
+        waterheight + Math.sin(Math.PI * 2 * (i / rectWidth) + x) * 3 + 1
+      );
+    }
+
+    ctx.lineTo(pixelCenter.x + radius, pixelCenter.y + radius);
+    ctx.lineTo(rectStartX, pixelCenter.y + radius);
+    ctx.lineTo(rectStartX, pixelCenter.y);
+    ctx.closePath();
+
+    ctx.fill();
+
+    ctx.restore();
+    return '';
+  });
+  return '';
+}
+
+const scene = new Scene({
+  id: 'map',
+  map: new GaodeMap({
+    style: 'fresh',
+    center: [ 115, 31 ],
+    zoom: 5.0
+  })
+});
+scene.on('loaded', () => {
+  const layer = new CanvasLayer({})
+    .style({
+      zIndex: 10,
+      update: 'aways',
+      drawingOnCanvas: draw
+    })
+    .animate({
+      enable: true
+    });
+  scene.addLayer(layer);
+
+  setInterval(() => {
+    x += 0.1;
+    layer.style({
+      drawingOnCanvas: draw
+    });
+    scene.render();
+    return '';
+  }, 30);
+  return '';
+});
+

examples/point/chart/demo/custom2.js

@@ -0,0 +1,63 @@
+// import { Scene, CanvasLayer } from '@antv/l7';
+import { Scene } from '@antv/l7';
+import { GaodeMap } from '@antv/l7-maps';
+
+const scene = new Scene({
+  id: 'map',
+  map: new GaodeMap({
+    style: 'fresh',
+    center: [ 90, 31 ],
+    zoom: 2
+  })
+});
+scene.on('loaded', () => {
+  // fetch(
+  //   'https://gw.alipayobjects.com/os/basement_prod/337ddbb7-aa3f-4679-ab60-d64359241955.json'
+  // )
+  //   .then(res => res.json())
+  //   .then(data => {
+  //     const layer = new CanvasLayer({})
+  //       .style({
+  //         zIndex: 10,
+  //         update: 'dragend',
+  //         drawingOnCanvas: function draw(option) {
+  //           const { size, ctx, mapService } = option;
+  //           const [ width, height ] = size;
+
+
+  //           ctx.clearRect(0, 0, width, height);
+  //           ctx.fillStyle = 'rgba(0, 200, 0, 0.2)';
+  //           data.features.map(feature => {
+  //             const pixelCenter = mapService.lngLatToContainer(
+  //               feature.geometry.coordinates
+  //             );
+  //             pixelCenter.x *= window.devicePixelRatio;
+  //             pixelCenter.y *= window.devicePixelRatio;
+  //             if (
+  //               pixelCenter.x < 0 ||
+  //             pixelCenter.y < 0 ||
+  //             pixelCenter.x > width ||
+  //             pixelCenter.y > height
+  //             ) { return; }
+  //             ctx.beginPath();
+  //             ctx.arc(
+  //               pixelCenter.x,
+  //               pixelCenter.y,
+  //               feature.properties.capacity / 200,
+  //               0,
+  //               Math.PI * 2
+  //             );
+  //             ctx.fill();
+  //             ctx.closePath();
+  //             return '';
+  //           });
+  //           return '';
+  //         }
+  //       });
+
+  //     scene.addLayer(layer);
+  //     return '';
+  //   });
+  return '';
+});
+

examples/point/chart/demo/meta.json

@@ -4,6 +4,16 @@
     "en": "Category"
   },
   "demos": [
+    {
+      "filename": "custom.js",
+      "title": "自定义水位图",
+      "screenshot":"https://gw.alipayobjects.com/mdn/rms_816329/afts/img/A*7FgbRppWc38AAAAAAAAAAAAAARQnAQ"
+    },
+    {
+      "filename": "custom2.js",
+      "title": "自定义气泡图",
+      "screenshot":"https://gw.alipayobjects.com/mdn/rms_816329/afts/img/A*SsiSTaYwCBgAAAAAAAAAAAAAARQnAQ"
+    },
     {
       "filename": "bar.js",
       "title": "柱图",