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PinBuilder.js
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PinBuilder.js
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define([
'./buildModuleUrl',
'./Color',
'./defined',
'./DeveloperError',
'./Resource',
'./writeTextToCanvas'
], function(
buildModuleUrl,
Color,
defined,
DeveloperError,
Resource,
writeTextToCanvas) {
'use strict';
/**
* A utility class for generating custom map pins as canvas elements.
* <br /><br />
* <div align='center'>
* <img src='Images/PinBuilder.png' width='500'/><br />
* Example pins generated using both the maki icon set, which ships with Cesium, and single character text.
* </div>
*
* @alias PinBuilder
* @constructor
*
* @demo {@link https://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=Map%20Pins.html|Cesium Sandcastle PinBuilder Demo}
*/
function PinBuilder() {
this._cache = {};
}
/**
* Creates an empty pin of the specified color and size.
*
* @param {Color} color The color of the pin.
* @param {Number} size The size of the pin, in pixels.
* @returns {Canvas} The canvas element that represents the generated pin.
*/
PinBuilder.prototype.fromColor = function(color, size) {
//>>includeStart('debug', pragmas.debug);
if (!defined(color)) {
throw new DeveloperError('color is required');
}
if (!defined(size)) {
throw new DeveloperError('size is required');
}
//>>includeEnd('debug');
return createPin(undefined, undefined, color, size, this._cache);
};
/**
* Creates a pin with the specified icon, color, and size.
*
* @param {Resource|String} url The url of the image to be stamped onto the pin.
* @param {Color} color The color of the pin.
* @param {Number} size The size of the pin, in pixels.
* @returns {Canvas|Promise.<Canvas>} The canvas element or a Promise to the canvas element that represents the generated pin.
*/
PinBuilder.prototype.fromUrl = function(url, color, size) {
//>>includeStart('debug', pragmas.debug);
if (!defined(url)) {
throw new DeveloperError('url is required');
}
if (!defined(color)) {
throw new DeveloperError('color is required');
}
if (!defined(size)) {
throw new DeveloperError('size is required');
}
//>>includeEnd('debug');
return createPin(url, undefined, color, size, this._cache);
};
/**
* Creates a pin with the specified {@link https://www.mapbox.com/maki/|maki} icon identifier, color, and size.
*
* @param {String} id The id of the maki icon to be stamped onto the pin.
* @param {Color} color The color of the pin.
* @param {Number} size The size of the pin, in pixels.
* @returns {Canvas|Promise.<Canvas>} The canvas element or a Promise to the canvas element that represents the generated pin.
*/
PinBuilder.prototype.fromMakiIconId = function(id, color, size) {
//>>includeStart('debug', pragmas.debug);
if (!defined(id)) {
throw new DeveloperError('id is required');
}
if (!defined(color)) {
throw new DeveloperError('color is required');
}
if (!defined(size)) {
throw new DeveloperError('size is required');
}
//>>includeEnd('debug');
return createPin(buildModuleUrl('Assets/Textures/maki/' + encodeURIComponent(id) + '.png'), undefined, color, size, this._cache);
};
/**
* Creates a pin with the specified text, color, and size. The text will be sized to be as large as possible
* while still being contained completely within the pin.
*
* @param {String} text The text to be stamped onto the pin.
* @param {Color} color The color of the pin.
* @param {Number} size The size of the pin, in pixels.
* @returns {Canvas} The canvas element that represents the generated pin.
*/
PinBuilder.prototype.fromText = function(text, color, size) {
//>>includeStart('debug', pragmas.debug);
if (!defined(text)) {
throw new DeveloperError('text is required');
}
if (!defined(color)) {
throw new DeveloperError('color is required');
}
if (!defined(size)) {
throw new DeveloperError('size is required');
}
//>>includeEnd('debug');
return createPin(undefined, text, color, size, this._cache);
};
var colorScratch = new Color();
//This function (except for the 3 commented lines) was auto-generated from an online tool,
//http://www.professorcloud.com/svg-to-canvas/, using Assets/Textures/pin.svg as input.
//The reason we simply can't load and draw the SVG directly to the canvas is because
//it taints the canvas in Internet Explorer (and possibly some other browsers); making
//it impossible to create a WebGL texture from the result.
function drawPin(context2D, color, size) {
context2D.save();
context2D.scale(size / 24, size / 24); //Added to auto-generated code to scale up to desired size.
context2D.fillStyle = color.toCssColorString(); //Modified from auto-generated code.
context2D.strokeStyle = color.brighten(0.6, colorScratch).toCssColorString(); //Modified from auto-generated code.
context2D.lineWidth = 0.846;
context2D.beginPath();
context2D.moveTo(6.72, 0.422);
context2D.lineTo(17.28, 0.422);
context2D.bezierCurveTo(18.553, 0.422, 19.577, 1.758, 19.577, 3.415);
context2D.lineTo(19.577, 10.973);
context2D.bezierCurveTo(19.577, 12.63, 18.553, 13.966, 17.282, 13.966);
context2D.lineTo(14.386, 14.008);
context2D.lineTo(11.826, 23.578);
context2D.lineTo(9.614, 14.008);
context2D.lineTo(6.719, 13.965);
context2D.bezierCurveTo(5.446, 13.983, 4.422, 12.629, 4.422, 10.972);
context2D.lineTo(4.422, 3.416);
context2D.bezierCurveTo(4.423, 1.76, 5.447, 0.423, 6.718, 0.423);
context2D.closePath();
context2D.fill();
context2D.stroke();
context2D.restore();
}
//This function takes an image or canvas and uses it as a template
//to "stamp" the pin with a white image outlined in black. The color
//values of the input image are ignored completely and only the alpha
//values are used.
function drawIcon(context2D, image, size) {
//Size is the largest image that looks good inside of pin box.
var imageSize = size / 2.5;
var sizeX = imageSize;
var sizeY = imageSize;
if (image.width > image.height) {
sizeY = imageSize * (image.height / image.width);
} else if (image.width < image.height) {
sizeX = imageSize * (image.width / image.height);
}
//x and y are the center of the pin box
var x = Math.round((size - sizeX) / 2);
var y = Math.round(((7 / 24) * size) - (sizeY / 2));
context2D.globalCompositeOperation = 'destination-out';
context2D.drawImage(image, x - 1, y, sizeX, sizeY);
context2D.drawImage(image, x, y - 1, sizeX, sizeY);
context2D.drawImage(image, x + 1, y, sizeX, sizeY);
context2D.drawImage(image, x, y + 1, sizeX, sizeY);
context2D.globalCompositeOperation = 'destination-over';
context2D.fillStyle = Color.BLACK.toCssColorString();
context2D.fillRect(x - 1, y - 1, sizeX + 2, sizeY + 2);
context2D.globalCompositeOperation = 'destination-out';
context2D.drawImage(image, x, y, sizeX, sizeY);
context2D.globalCompositeOperation = 'destination-over';
context2D.fillStyle = Color.WHITE.toCssColorString();
context2D.fillRect(x - 1, y - 2, sizeX + 2, sizeY + 2);
}
var stringifyScratch = new Array(4);
function createPin(url, label, color, size, cache) {
//Use the parameters as a unique ID for caching.
stringifyScratch[0] = url;
stringifyScratch[1] = label;
stringifyScratch[2] = color;
stringifyScratch[3] = size;
var id = JSON.stringify(stringifyScratch);
var item = cache[id];
if (defined(item)) {
return item;
}
var canvas = document.createElement('canvas');
canvas.width = size;
canvas.height = size;
var context2D = canvas.getContext('2d');
drawPin(context2D, color, size);
if (defined(url)) {
var resource = Resource.createIfNeeded(url);
//If we have an image url, load it and then stamp the pin.
var promise = resource.fetchImage().then(function(image) {
drawIcon(context2D, image, size);
cache[id] = canvas;
return canvas;
});
cache[id] = promise;
return promise;
} else if (defined(label)) {
//If we have a label, write it to a canvas and then stamp the pin.
var image = writeTextToCanvas(label, {
font : 'bold ' + size + 'px sans-serif'
});
drawIcon(context2D, image, size);
}
cache[id] = canvas;
return canvas;
}
return PinBuilder;
});