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import merge from "../help/merge.js"; |
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3
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function getEncodingHeight(encoding, options){ |
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return options.height + |
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((options.displayValue && encoding.text.length > 0) ? options.fontSize + options.textMargin : 0) + |
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options.marginTop + |
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options.marginBottom; |
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} |
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function getBarcodePadding(textWidth, barcodeWidth, options){ |
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if(options.displayValue && barcodeWidth < textWidth){ |
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if(options.textAlign == "center"){ |
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return Math.floor((textWidth - barcodeWidth) / 2); |
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} |
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else if(options.textAlign == "left"){ |
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return 0; |
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} |
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else if(options.textAlign == "right"){ |
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return Math.floor(textWidth - barcodeWidth); |
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} |
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} |
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return 0; |
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} |
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function calculateEncodingAttributes(encodings, barcodeOptions, context){ |
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for(let i = 0; i < encodings.length; i++){ |
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var encoding = encodings[i]; |
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var options = merge(barcodeOptions, encoding.options); |
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// Calculate the width of the encoding |
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var textWidth; |
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if(options.displayValue){ |
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textWidth = messureText(encoding.text, options, context); |
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} |
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else{ |
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textWidth = 0; |
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} |
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var barcodeWidth = encoding.data.length * options.width; |
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encoding.width = Math.ceil(Math.max(textWidth, barcodeWidth)); |
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encoding.height = getEncodingHeight(encoding, options); |
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encoding.barcodePadding = getBarcodePadding(textWidth, barcodeWidth, options); |
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} |
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} |
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48
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function getTotalWidthOfEncodings(encodings){ |
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var totalWidth = 0; |
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for(let i = 0; i < encodings.length; i++){ |
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totalWidth += encodings[i].width; |
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} |
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return totalWidth; |
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} |
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function getMaximumHeightOfEncodings(encodings){ |
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var maxHeight = 0; |
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for(let i = 0; i < encodings.length; i++){ |
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if(encodings[i].height > maxHeight){ |
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maxHeight = encodings[i].height; |
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} |
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} |
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return maxHeight; |
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} |
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66
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function messureText(string, options, context){ |
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var ctx; |
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if(context){ |
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ctx = context; |
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} |
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else if(typeof document !== "undefined"){ |
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ctx = document.createElement("canvas").getContext("2d"); |
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} |
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else{ |
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// If the text cannot be messured we will return 0. |
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// This will make some barcode with big text render incorrectly |
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return 0; |
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} |
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ctx.font = options.fontOptions + " " + options.fontSize + "px " + options.font; |
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82
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// Calculate the width of the encoding |
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var size = ctx.measureText(string).width; |
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return size; |
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} |
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88
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export {getMaximumHeightOfEncodings, getEncodingHeight, getBarcodePadding, calculateEncodingAttributes, getTotalWidthOfEncodings}; |
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lindell /
JsBarcode
