Add a canvas source

Add a CanvasSource to the map.


npm install --save @maptiler/sdk

main.js

import { Map, MapStyle, config } from '@maptiler/sdk';
import '@maptiler/sdk/dist/maptiler-sdk.css';

config.apiKey = 'YOUR_MAPTILER_API_KEY_HERE';
//Animation from https://javascript.tutorials24x7.com/blog/how-to-draw-animated-circles-in-html5-canvas
const canvas = document.getElementById('canvasID');
const ctx = canvas.getContext('2d');
const circles = [];
const radius = 20;

function Circle(x, y, dx, dy, radius, color) {
    this.x = x;
    this.y = y;
    this.dx = dx;
    this.dy = dy;

    this.radius = radius;

    this.draw = function () {
        ctx.beginPath();
        ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false);
        ctx.strokeStyle = color;
        ctx.stroke();
    };

    this.update = function () {
        if (this.x + this.radius > 400 || this.x - this.radius < 0) {
            this.dx = -this.dx;
        }

        if (this.y + this.radius > 400 || this.y - this.radius < 0) {
            this.dy = -this.dy;
        }

        this.x += this.dx;
        this.y += this.dy;

        this.draw();
    };
}

for (let i = 0; i < 5; i++) {
    const color =
        '#' +
        (0x1000000 + Math.random() * 0xffffff).toString(16).substr(1, 6);
    const  x = Math.random() * (400 - radius * 2) + radius;
    const  y = Math.random() * (400 - radius * 2) + radius;

    const dx = (Math.random() - 0.5) * 2;
    const dy = (Math.random() - 0.5) * 2;

    circles.push(new Circle(x, y, dx, dy, radius, color));
}

function animate() {
    requestAnimationFrame(animate);
    ctx.clearRect(0, 0, 400, 400);

    for (let r = 0; r < 5; r++) {
        circles[r].update();
    }
}

animate();

const map = new Map({
    container: 'map',
    zoom: 5,
    minZoom: 4,
    center: [95.899147, 18.088694],
    style: MapStyle.STREETS
});

map.on('load', function () {
    map.addSource('canvas-source', {
        type: 'canvas',
        canvas: 'canvasID',
        coordinates: [
            [91.4461, 21.5006],
            [100.3541, 21.5006],
            [100.3541, 13.9706],
            [91.4461, 13.9706]
        ],
        // Set to true if the canvas source is animated. If the canvas is static, animate should be set to false to improve performance.
        animate: true
    });

    map.addLayer({
        id: 'canvas-layer',
        type: 'raster',
        source: 'canvas-source'
    });
});

index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="robots" content="noindex">
  <title>Add a canvas source | NPM example</title>
  <link rel="stylesheet" href="./style.css">
</head>
<body>
  <canvas id="canvasID" width="400" height="400">Canvas not supported</canvas>
  <div id="map"></div>
  <script type="module" src="./main.js"></script>
</body>
</html>

style.css

body {margin: 0; padding: 0;}
#map {position: absolute; top: 0; bottom: 0; width: 100%;}

<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Add a canvas source</title>
<script src="https://cdn.maptiler.com/maptiler-sdk-js/v4.1.0/maptiler-sdk.umd.min.js"></script>
<link href="https://cdn.maptiler.com/maptiler-sdk-js/v4.1.0/maptiler-sdk.css" rel="stylesheet" />
<style>
  body {margin: 0; padding: 0;}
  #map {position: absolute; top: 0; bottom: 0; width: 100%;}
</style>
</head>
<body>
<canvas id="canvasID" width="400" height="400">Canvas not supported</canvas>
<div id="map"></div>
<script>
    maptilersdk.config.apiKey = 'YOUR_MAPTILER_API_KEY_HERE';
    //Animation from https://javascript.tutorials24x7.com/blog/how-to-draw-animated-circles-in-html5-canvas
    const canvas = document.getElementById('canvasID');
    const ctx = canvas.getContext('2d');
    const circles = [];
    const radius = 20;

    function Circle(x, y, dx, dy, radius, color) {
        this.x = x;
        this.y = y;
        this.dx = dx;
        this.dy = dy;

        this.radius = radius;

        this.draw = function () {
            ctx.beginPath();
            ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false);
            ctx.strokeStyle = color;
            ctx.stroke();
        };

        this.update = function () {
            if (this.x + this.radius > 400 || this.x - this.radius < 0) {
                this.dx = -this.dx;
            }

            if (this.y + this.radius > 400 || this.y - this.radius < 0) {
                this.dy = -this.dy;
            }

            this.x += this.dx;
            this.y += this.dy;

            this.draw();
        };
    }

    for (let i = 0; i < 5; i++) {
        const color =
            '#' +
            (0x1000000 + Math.random() * 0xffffff).toString(16).substr(1, 6);
        const  x = Math.random() * (400 - radius * 2) + radius;
        const  y = Math.random() * (400 - radius * 2) + radius;

        const dx = (Math.random() - 0.5) * 2;
        const dy = (Math.random() - 0.5) * 2;

        circles.push(new Circle(x, y, dx, dy, radius, color));
    }

    function animate() {
        requestAnimationFrame(animate);
        ctx.clearRect(0, 0, 400, 400);

        for (let r = 0; r < 5; r++) {
            circles[r].update();
        }
    }

    animate();

    const map = new maptilersdk.Map({
        container: 'map',
        zoom: 5,
        minZoom: 4,
        center: [95.899147, 18.088694],
        style: maptilersdk.MapStyle.STREETS
    });

    map.on('load', function () {
        map.addSource('canvas-source', {
            type: 'canvas',
            canvas: 'canvasID',
            coordinates: [
                [91.4461, 21.5006],
                [100.3541, 21.5006],
                [100.3541, 13.9706],
                [91.4461, 13.9706]
            ],
            // Set to true if the canvas source is animated. If the canvas is static, animate should be set to false to improve performance.
            animate: true
        });

        map.addLayer({
            id: 'canvas-layer',
            type: 'raster',
            source: 'canvas-source'
        });
    });
</script>
</body>
</html>