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Viewing file:     shared.js (3.14 KB)      -rw-r--r--

"use strict";

Object.defineProperty(exports, "__esModule", {
	value: true
});
exports.getTotalWidthOfEncodings = exports.calculateEncodingAttributes = exports.getBarcodePadding = exports.getEncodingHeight = exports.getMaximumHeightOfEncodings = undefined;

var _merge = require("../help/merge.js");

var _merge2 = _interopRequireDefault(_merge);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function getEncodingHeight(encoding, options) {
	return options.height + (options.displayValue && encoding.text.length > 0 ? options.fontSize + options.textMargin : 0) + options.marginTop + options.marginBottom;
}

function getBarcodePadding(textWidth, barcodeWidth, options) {
	if (options.displayValue && barcodeWidth < textWidth) {
		if (options.textAlign == "center") {
			return Math.floor((textWidth - barcodeWidth) / 2);
		} else if (options.textAlign == "left") {
			return 0;
		} else if (options.textAlign == "right") {
			return Math.floor(textWidth - barcodeWidth);
		}
	}
	return 0;
}

function calculateEncodingAttributes(encodings, barcodeOptions, context) {
	for (var i = 0; i < encodings.length; i++) {
		var encoding = encodings[i];
		var options = (0, _merge2.default)(barcodeOptions, encoding.options);

		// Calculate the width of the encoding
		var textWidth;
		if (options.displayValue) {
			textWidth = messureText(encoding.text, options, context);
		} else {
			textWidth = 0;
		}

		var barcodeWidth = encoding.data.length * options.width;
		encoding.width = Math.ceil(Math.max(textWidth, barcodeWidth));

		encoding.height = getEncodingHeight(encoding, options);

		encoding.barcodePadding = getBarcodePadding(textWidth, barcodeWidth, options);
	}
}

function getTotalWidthOfEncodings(encodings) {
	var totalWidth = 0;
	for (var i = 0; i < encodings.length; i++) {
		totalWidth += encodings[i].width;
	}
	return totalWidth;
}

function getMaximumHeightOfEncodings(encodings) {
	var maxHeight = 0;
	for (var i = 0; i < encodings.length; i++) {
		if (encodings[i].height > maxHeight) {
			maxHeight = encodings[i].height;
		}
	}
	return maxHeight;
}

function messureText(string, options, context) {
	var ctx;

	if (context) {
		ctx = context;
	} else if (typeof document !== "undefined") {
		ctx = document.createElement("canvas").getContext("2d");
	} else {
		// If the text cannot be messured we will return 0.
		// This will make some barcode with big text render incorrectly
		return 0;
	}
	ctx.font = options.fontOptions + " " + options.fontSize + "px " + options.font;

	// Calculate the width of the encoding
	var measureTextResult = ctx.measureText(string);
	if (!measureTextResult) {
		// Some implementations don't implement measureText and return undefined.
		// If the text cannot be measured we will return 0.
		// This will make some barcode with big text render incorrectly
		return 0;
	}
	var size = measureTextResult.width;
	return size;
}

exports.getMaximumHeightOfEncodings = getMaximumHeightOfEncodings;
exports.getEncodingHeight = getEncodingHeight;
exports.getBarcodePadding = getBarcodePadding;
exports.calculateEncodingAttributes = calculateEncodingAttributes;
exports.getTotalWidthOfEncodings = getTotalWidthOfEncodings;