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export default renderCanvas; |
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import merge from "../help/merge.js"; |
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import {getEncodingHeight, getBarcodePadding} from "./shared.js" |
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function renderCanvas(canvas, encodings, options){ |
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// Abort if the browser does not support HTML5 canvas |
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if (!canvas.getContext) { |
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throw new Error('The browser does not support canvas.'); |
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} |
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prepareCanvas(canvas, options, encodings); |
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for(let i = 0; i < encodings.length; i++){ |
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var encodingOptions = merge(options, encodings[i].options); |
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drawCanvasBarcode(canvas, encodingOptions, encodings[i]); |
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drawCanvasText(canvas, encodingOptions, encodings[i]); |
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moveCanvasDrawing(canvas, encodings[i]); |
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} |
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restoreCanvas(canvas); |
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} |
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function prepareCanvas(canvas, globalOptions, encodings){ |
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// Get the canvas context |
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var ctx = canvas.getContext("2d"); |
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ctx.save(); |
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// Calculate total width |
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var totalWidth = 0; |
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var maxHeight = 0; |
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for(let i = 0; i < encodings.length; i++){ |
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var options = merge(globalOptions, encodings[i].options); |
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// Set font |
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ctx.font = options.fontOptions + " " + options.fontSize + "px " + options.font; |
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// Calculate the width of the encoding |
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var textWidth = ctx.measureText(encodings[i].text).width; |
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var barcodeWidth = encodings[i].data.length * options.width; |
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encodings[i].width = Math.ceil(Math.max(textWidth, barcodeWidth)); |
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// Calculate the height of the encoding |
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var height = getEncodingHeight(encodings[i], options); |
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encodings[i].barcodePadding = getBarcodePadding(textWidth, barcodeWidth, options); |
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if(height > maxHeight){ |
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maxHeight = height; |
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} |
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totalWidth += encodings[i].width; |
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} |
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canvas.width = totalWidth + globalOptions.marginLeft + globalOptions.marginRight; |
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canvas.height = maxHeight; |
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// Paint the canvas |
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ctx.clearRect(0, 0, canvas.width, canvas.height); |
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if(globalOptions.background){ |
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ctx.fillStyle = globalOptions.background; |
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ctx.fillRect(0, 0, canvas.width, canvas.height); |
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} |
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ctx.translate(globalOptions.marginLeft, 0); |
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} |
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function drawCanvasBarcode(canvas, options, encoding){ |
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// Get the canvas context |
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var ctx = 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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} |
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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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} |
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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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function drawCanvasText(canvas, options, encoding){ |
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// Get the canvas context |
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var ctx = 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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} |
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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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} |
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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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function moveCanvasDrawing(canvas, encoding){ |
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var ctx = canvas.getContext("2d"); |
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ctx.translate(encoding.width, 0); |
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} |
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function restoreCanvas(canvas){ |
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// Get the canvas context |
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var ctx = canvas.getContext("2d"); |
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ctx.restore(); |
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} |
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lindell /
JsBarcode
