94 lines
2.7 KiB
JavaScript
94 lines
2.7 KiB
JavaScript
import merge from "../help/merge.js";
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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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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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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}`.trim() //options.fontOptions + " " + options.fontSize + "px " + options.font;
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// Calculate the width of the encoding
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var measureTextResult = ctx.measureText(string);
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if (!measureTextResult) {
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// Some implementations don't implement measureText and return undefined.
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// If the text cannot be measured 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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var size = measureTextResult.width;
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return size;
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}
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export { getMaximumHeightOfEncodings, getEncodingHeight, getBarcodePadding, calculateEncodingAttributes, getTotalWidthOfEncodings };
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