diff --git a/src/browser/BrowserSvgCodeWriter.ts b/src/browser/BrowserSvgCodeWriter.ts new file mode 100644 index 00000000..71ad8109 --- /dev/null +++ b/src/browser/BrowserSvgCodeWriter.ts @@ -0,0 +1,163 @@ +import EncodeHintType from '../core/EncodeHintType'; +import Encoder from '../core/qrcode/encoder/Encoder'; +import QRCode from '../core/qrcode/encoder/QRCode'; +import ErrorCorrectionLevel from '../core/qrcode/decoder/ErrorCorrectionLevel'; +import IllegalArgumentException from '../core/IllegalArgumentException'; +import IllegalStateException from '../core/IllegalStateException'; + +/** + * @deprecated Moving to @zxing/browser + */ +abstract class BrowserSvgCodeWriter { + + /** + * Default quiet zone in pixels. + */ + private static readonly QUIET_ZONE_SIZE = 4; + + /** + * SVG markup NameSpace + */ + private static readonly SVG_NS = 'http://www.w3.org/2000/svg'; + + /** + * A HTML container element for the image. + */ + private containerElement: HTMLElement; + + /** + * Constructs. 😉 + */ + public constructor(containerElement: string | HTMLElement) { + if (typeof containerElement === 'string') { + this.containerElement = document.getElementById(containerElement); + } else { + this.containerElement = containerElement; + } + } + + /** + * Writes the QR code to a SVG and renders it in the container. + */ + public write( + contents: string, + width: number, + height: number, + hints: Map = null + ): SVGSVGElement { + + if (contents.length === 0) { + throw new IllegalArgumentException('Found empty contents'); + } + + if (width < 0 || height < 0) { + throw new IllegalArgumentException('Requested dimensions are too small: ' + width + 'x' + height); + } + + let quietZone = hints && hints.get(EncodeHintType.MARGIN) !== undefined + ? Number.parseInt(hints.get(EncodeHintType.MARGIN).toString(), 10) + : BrowserSvgCodeWriter.QUIET_ZONE_SIZE; + + const code = this.encode(hints, contents); + + return this.renderResult(code, width, height, quietZone); + } + + /** + * Encodes the content to a Barcode type. + */ + private encode(hints: Map, contents: string): QRCode { + + let errorCorrectionLevel = ErrorCorrectionLevel.L; + + if (hints && hints.get(EncodeHintType.ERROR_CORRECTION) !== undefined) { + errorCorrectionLevel = ErrorCorrectionLevel.fromString(hints.get(EncodeHintType.ERROR_CORRECTION).toString()); + } + + const code = Encoder.encode(contents, errorCorrectionLevel, hints); + + return code; + } + + /** + * Renders the SVG in the container. + * + * @note the input matrix uses 0 == white, 1 == black. The output matrix uses 0 == black, 255 == white (i.e. an 8 bit greyscale bitmap). + */ + private renderResult(code: QRCode, width: number /*int*/, height: number /*int*/, quietZone: number /*int*/): SVGSVGElement { + + // if (this.format && format != this.format) { + // throw new IllegalArgumentException("Can only encode QR_CODE, but got " + format) + // } + + const input = code.getMatrix(); + + if (input === null) { + throw new IllegalStateException(); + } + + const inputWidth = input.getWidth(); + const inputHeight = input.getHeight(); + const qrWidth = inputWidth + (quietZone * 2); + const qrHeight = inputHeight + (quietZone * 2); + const outputWidth = Math.max(width, qrWidth); + const outputHeight = Math.max(height, qrHeight); + + const multiple = Math.min(Math.floor(outputWidth / qrWidth), Math.floor(outputHeight / qrHeight)); + + // Padding includes both the quiet zone and the extra white pixels to accommodate the requested + // dimensions. For example, if input is 25x25 the QR will be 33x33 including the quiet zone. + // If the requested size is 200x160, the multiple will be 4, for a QR of 132x132. These will + // handle all the padding from 100x100 (the actual QR) up to 200x160. + const leftPadding = Math.floor((outputWidth - (inputWidth * multiple)) / 2); + const topPadding = Math.floor((outputHeight - (inputHeight * multiple)) / 2); + + const svgElement = this.createSVGElement(outputWidth, outputHeight); + + this.containerElement.appendChild(svgElement); + + // 2D loop + for (let inputY = 0, outputY = topPadding; inputY < inputHeight; inputY++ , outputY += multiple) { + // Write the contents of this row of the barcode + for (let inputX = 0, outputX = leftPadding; inputX < inputWidth; inputX++ , outputX += multiple) { + if (input.get(inputX, inputY) === 1) { + const svgRectElement = this.createSvgRectElement(outputX, outputY, multiple, multiple); + svgElement.appendChild(svgRectElement); + } + } + } + + return svgElement; + } + + /** + * Creates a SVG element. + */ + protected createSVGElement(w: number, h: number): SVGSVGElement { + + const svgElement = document.createElementNS(BrowserSvgCodeWriter.SVG_NS, 'svg'); + + svgElement.setAttributeNS(null, 'height', w.toString()); + svgElement.setAttributeNS(null, 'width', h.toString()); + + return svgElement; + } + + /** + * Creates a SVG rect. + */ + protected createSvgRectElement(x: number, y: number, w: number, h: number): SVGRectElement { + + const rect = document.createElementNS(BrowserSvgCodeWriter.SVG_NS, 'rect'); + + rect.setAttributeNS(null, 'x', x.toString()); + rect.setAttributeNS(null, 'y', y.toString()); + rect.setAttributeNS(null, 'height', w.toString()); + rect.setAttributeNS(null, 'width', h.toString()); + rect.setAttributeNS(null, 'fill', '#000000'); + + return rect; + } +} + +export { BrowserSvgCodeWriter };