Barcode Generation

node_modules/jsbarcode/src/renderers/svg.js

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+import merge from "../help/merge.js";
+import {calculateEncodingAttributes, getTotalWidthOfEncodings, getMaximumHeightOfEncodings} from "./shared.js";
+
+var svgns = "http://www.w3.org/2000/svg";
+
+class SVGRenderer{
+	constructor(svg, encodings, options){
+		this.svg = svg;
+		this.encodings = encodings;
+		this.options = options;
+		this.document = options.xmlDocument || document;
+	}
+
+	render(){
+		var currentX = this.options.marginLeft;
+
+		this.prepareSVG();
+		for(let i = 0; i < this.encodings.length; i++){
+			var encoding = this.encodings[i];
+			var encodingOptions = merge(this.options, encoding.options);
+
+			var group = this.createGroup(currentX, encodingOptions.marginTop, this.svg);
+
+			this.setGroupOptions(group, encodingOptions);
+
+			this.drawSvgBarcode(group, encodingOptions, encoding);
+			this.drawSVGText(group, encodingOptions, encoding);
+
+			currentX += encoding.width;
+		}
+	}
+
+	prepareSVG(){
+		// Clear the SVG
+		while (this.svg.firstChild) {
+			this.svg.removeChild(this.svg.firstChild);
+		}
+
+		calculateEncodingAttributes(this.encodings, this.options);
+		var totalWidth = getTotalWidthOfEncodings(this.encodings);
+		var maxHeight = getMaximumHeightOfEncodings(this.encodings);
+
+		var width = totalWidth + this.options.marginLeft + this.options.marginRight;
+		this.setSvgAttributes(width, maxHeight);
+
+		if(this.options.background){
+			this.drawRect(0, 0, width, maxHeight, this.svg).setAttribute(
+				"style", "fill:" + this.options.background + ";"
+			);
+		}
+	}
+
+	drawSvgBarcode(parent, options, encoding){
+		var binary = encoding.data;
+
+		// Creates the barcode out of the encoded binary
+		var yFrom;
+		if(options.textPosition == "top"){
+			yFrom = options.fontSize + options.textMargin;
+		}
+		else{
+			yFrom = 0;
+		}
+
+		var barWidth = 0;
+		var x = 0;
+		for(var b = 0; b < binary.length; b++){
+			x = b * options.width + encoding.barcodePadding;
+
+			if(binary[b] === "1"){
+				barWidth++;
+			}
+			else if(barWidth > 0){
+				this.drawRect(x - options.width * barWidth, yFrom, options.width * barWidth, options.height, parent);
+				barWidth = 0;
+			}
+		}
+
+		// Last draw is needed since the barcode ends with 1
+		if(barWidth > 0){
+			this.drawRect(x - options.width * (barWidth - 1), yFrom, options.width * barWidth, options.height, parent);
+		}
+	}
+
+	drawSVGText(parent, options, encoding){
+		var textElem = this.document.createElementNS(svgns, 'text');
+
+		// Draw the text if displayValue is set
+		if(options.displayValue){
+			var x, y;
+
+			textElem.setAttribute("style",
+				"font:" + options.fontOptions + " " + options.fontSize + "px " + options.font
+			);
+
+			if(options.textPosition == "top"){
+				y = options.fontSize - options.textMargin;
+			}
+			else{
+				y = options.height + options.textMargin + options.fontSize;
+			}
+
+			// Draw the text in the correct X depending on the textAlign option
+			if(options.textAlign == "left" || encoding.barcodePadding > 0){
+				x = 0;
+				textElem.setAttribute("text-anchor", "start");
+			}
+			else if(options.textAlign == "right"){
+				x = encoding.width - 1;
+				textElem.setAttribute("text-anchor", "end");
+			}
+			// In all other cases, center the text
+			else{
+				x = encoding.width / 2;
+				textElem.setAttribute("text-anchor", "middle");
+			}
+
+			textElem.setAttribute("x", x);
+			textElem.setAttribute("y", y);
+
+			textElem.appendChild(this.document.createTextNode(encoding.text));
+
+			parent.appendChild(textElem);
+		}
+	}
+
+
+	setSvgAttributes(width, height){
+		var svg = this.svg;
+		svg.setAttribute("width", width + "px");
+		svg.setAttribute("height", height + "px");
+		svg.setAttribute("x", "0px");
+		svg.setAttribute("y", "0px");
+		svg.setAttribute("viewBox", "0 0 " + width + " " + height);
+
+		svg.setAttribute("xmlns", svgns);
+		svg.setAttribute("version", "1.1");
+
+		svg.setAttribute("style", "transform: translate(0,0)");
+	}
+
+	createGroup(x, y, parent){
+		var group = this.document.createElementNS(svgns, 'g');
+		group.setAttribute("transform", "translate(" + x + ", " + y + ")");
+
+		parent.appendChild(group);
+
+		return group;
+	}
+
+	setGroupOptions(group, options){
+		group.setAttribute("style",
+			"fill:" + options.lineColor + ";"
+		);
+	}
+
+	drawRect(x, y, width, height, parent){
+		var rect = this.document.createElementNS(svgns, 'rect');
+
+		rect.setAttribute("x", x);
+		rect.setAttribute("y", y);
+		rect.setAttribute("width", width);
+		rect.setAttribute("height", height);
+
+		parent.appendChild(rect);
+
+		return rect;
+	}
+}
+
+export default SVGRenderer;