"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
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var _merge = require("../help/merge.js");
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var _merge2 = _interopRequireDefault(_merge);
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var _shared = require("./shared.js");
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
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var CanvasRenderer = function () {
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function CanvasRenderer(canvas, encodings, options) {
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_classCallCheck(this, CanvasRenderer);
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this.canvas = canvas;
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this.encodings = encodings;
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this.options = options;
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}
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_createClass(CanvasRenderer, [{
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key: "render",
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value: function render() {
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// Abort if the browser does not support HTML5 canvas
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if (!this.canvas.getContext) {
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throw new Error('The browser does not support canvas.');
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}
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this.prepareCanvas();
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for (var i = 0; i < this.encodings.length; i++) {
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var encodingOptions = (0, _merge2.default)(this.options, this.encodings[i].options);
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this.drawCanvasBarcode(encodingOptions, this.encodings[i]);
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this.drawCanvasText(encodingOptions, this.encodings[i]);
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this.moveCanvasDrawing(this.encodings[i]);
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}
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this.restoreCanvas();
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}
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}, {
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key: "prepareCanvas",
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value: function prepareCanvas() {
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// Get the canvas context
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var ctx = this.canvas.getContext("2d");
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ctx.save();
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(0, _shared.calculateEncodingAttributes)(this.encodings, this.options, ctx);
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var totalWidth = (0, _shared.getTotalWidthOfEncodings)(this.encodings);
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var maxHeight = (0, _shared.getMaximumHeightOfEncodings)(this.encodings);
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this.canvas.width = totalWidth + this.options.marginLeft + this.options.marginRight;
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this.canvas.height = maxHeight;
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// Paint the canvas
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ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
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if (this.options.background) {
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ctx.fillStyle = this.options.background;
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ctx.fillRect(0, 0, this.canvas.width, this.canvas.height);
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}
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ctx.translate(this.options.marginLeft, 0);
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}
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}, {
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key: "drawCanvasBarcode",
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value: function drawCanvasBarcode(options, encoding) {
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// Get the canvas context
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var ctx = this.canvas.getContext("2d");
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var binary = encoding.data;
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// Creates the barcode out of the encoded binary
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var yFrom;
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if (options.textPosition == "top") {
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yFrom = options.marginTop + options.fontSize + options.textMargin;
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} else {
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yFrom = options.marginTop;
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}
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ctx.fillStyle = options.lineColor;
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for (var b = 0; b < binary.length; b++) {
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var x = b * options.width + encoding.barcodePadding;
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if (binary[b] === "1") {
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ctx.fillRect(x, yFrom, options.width, options.height);
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} else if (binary[b]) {
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ctx.fillRect(x, yFrom, options.width, options.height * binary[b]);
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}
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}
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}
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}, {
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key: "drawCanvasText",
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value: function drawCanvasText(options, encoding) {
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// Get the canvas context
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var ctx = this.canvas.getContext("2d");
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var font = options.fontOptions + " " + options.fontSize + "px " + options.font;
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// Draw the text if displayValue is set
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if (options.displayValue) {
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var x, y;
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if (options.textPosition == "top") {
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y = options.marginTop + options.fontSize - options.textMargin;
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} else {
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y = options.height + options.textMargin + options.marginTop + options.fontSize;
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}
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ctx.font = font;
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// Draw the text in the correct X depending on the textAlign option
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if (options.textAlign == "left" || encoding.barcodePadding > 0) {
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x = 0;
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ctx.textAlign = 'left';
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} else if (options.textAlign == "right") {
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x = encoding.width - 1;
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ctx.textAlign = 'right';
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}
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// In all other cases, center the text
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else {
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x = encoding.width / 2;
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ctx.textAlign = 'center';
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}
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ctx.fillText(encoding.text, x, y);
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}
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}
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}, {
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key: "moveCanvasDrawing",
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value: function moveCanvasDrawing(encoding) {
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var ctx = this.canvas.getContext("2d");
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ctx.translate(encoding.width, 0);
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}
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}, {
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key: "restoreCanvas",
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value: function restoreCanvas() {
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// Get the canvas context
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var ctx = this.canvas.getContext("2d");
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ctx.restore();
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}
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}]);
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return CanvasRenderer;
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}();
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exports.default = CanvasRenderer;
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