Mercurial > gemma
view client/src/components/Pdftool.vue @ 2068:5a898da60b87
dma added
author | Thomas Junk <thomas.junk@intevation.de> |
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date | Wed, 30 Jan 2019 15:43:08 +0100 |
parents | b275d5e14087 |
children | 1dafdbfca100 |
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<template> <div :class="[ 'box ui-element rounded bg-white text-nowrap', { expanded: showPdfTool } ]" > <div style="width: 20rem"> <h6 class="mb-0 py-2 px-3 border-bottom d-flex align-items-center"> <font-awesome-icon icon="file-pdf" class="mr-2"></font-awesome-icon> <translate>Generate PDF</translate> <font-awesome-icon icon="times" class="ml-auto text-muted" @click="$store.commit('application/showPdfTool', false)" ></font-awesome-icon> </h6> <div class="p-3"> <b><translate>Choose format:</translate></b> <select v-model="form.format" class="form-control d-block w-100"> <option value="landscape"><translate>landscape</translate></option> <option value="portrait"><translate>portrait</translate></option> </select> <select v-model="form.resolution" class="form-control d-block w-100"> <option value="80">80 dpi</option> <option value="120">120 dpi</option> <option value="200">200 dpi</option> </select> <select v-model="form.paperSize" class="form-control d-block w-100"> <option value="a3"><translate>ISO A3</translate></option> <option value="a4"><translate>ISO A4</translate></option> </select> <!-- <small class="d-block my-2"> <input type="radio" id="pdfexport-downloadtype-download" value="download" v-model="form.downloadType" selected /> <label for="pdfexport-downloadtype-download" class="ml-1 mr-2"> <translate>Download</translate> </label> <input type="radio" id="pdfexport-downloadtype-open" value="open" v-model="form.downloadType" /> <label for="pdfexport-downloadtype-open" class="ml-1"> <translate>Open in new window</translate> </label> </small> --> <button @click="download" type="button" v-bind:disabled="!readyToGenerate" class="btn btn-sm btn-info d-block w-100" > <translate>Generate PDF</translate> </button> </div> </div> </div> </template> <script> /* This is Free Software under GNU Affero General Public License v >= 3.0 * without warranty, see README.md and license for details. * * SPDX-License-Identifier: AGPL-3.0-or-later * License-Filename: LICENSES/AGPL-3.0.txt * * Copyright (C) 2018, 2019 by via donau * – Österreichische Wasserstraßen-Gesellschaft mbH * Software engineering by Intevation GmbH * * Author(s): * * Markus Kottländer <markus.kottlaender@intevation.de> * * Bernhard E. Reiter <bernhard@intevation.de> * * Fadi Abbud <fadi.abbud@intevation.de> */ import { mapGetters, mapState } from "vuex"; import jsPDF from "jspdf"; import { getPointResolution } from "ol/proj.js"; import locale2 from "locale2"; var paperSizes = { // in millimeter, landscape [width, height] a3: [420, 297], a4: [297, 210] }; export default { name: "pdftool", data() { return { form: { format: "landscape", paperSize: "a4", downloadType: "download", resolution: "120" }, logoImageForPDF: null, // a HTMLImageElement instance readyToGenerate: true // if the user is allowed to press the button }; }, computed: { ...mapState("application", ["showPdfTool", "logoForPDF"]), ...mapState("bottlenecks", ["selectedSurvey"]), ...mapState("map", ["openLayersMap", "isolinesLegendImgDataURL"]), ...mapGetters("map", ["getLayerByName"]), ...mapState("user", ["user"]) }, methods: { download() { // disable button while working on it this.readyToGenerate = false; console.log( "will generate pdf with", this.form.paperSize, this.form.format, this.form.resolution ); var width, height; if (this.form.format !== "portrait") { // landscape, default width = paperSizes[this.form.paperSize][0]; height = paperSizes[this.form.paperSize][1]; } else { // switch width and height width = paperSizes[this.form.paperSize][1]; height = paperSizes[this.form.paperSize][0]; } // FUTURE: consider margins // dots per mm = dots per inch / (25.4 mm/inch) var pixelsPerMapMillimeter = this.form.resolution / 25.4; var mapSizeForPrint = [ // in pixel Math.round(width * pixelsPerMapMillimeter), Math.round(height * pixelsPerMapMillimeter) ]; // generate PDF and open it // our units are milimeters; width 0 x height 0 is left upper corner // Step 1 prepare and save current map extend // Then add callback "rendercomplete" for Step 3 // which will generate the pdf and resets the map view // Step 2 which starts rendering a map with the necessary image size var map = this.openLayersMap; var mapSize = map.getSize(); // size in pixels of the map in the DOM // Calculate the extent for the current view state and the passed size. // The size is the pixel dimensions of the box into which the calculated // extent should fit. var mapExtent = map.getView().calculateExtent(mapSize); var pdf = new jsPDF(this.form.format, "mm", this.form.paperSize); var northarrowSize = 3; var self = this; // set a callback for after the next complete rendering of the map map.once("rendercomplete", function(event) { let canvas = event.context.canvas; // because we are using Web Mercator, a pixel represents // a differently sizes spot depending on the place of the map. // So we use a value calculated from the center of the current view. let view = map.getView(); let proj = view.getProjection(); let metersPerPixel = // average meters (reality) per pixel (map) getPointResolution(proj, view.getResolution(), view.getCenter()) * proj.getMetersPerUnit(); // DEBUG console.log("metersPerPixel = ", metersPerPixel); let scaleNominator = Math.round( // the x in 1:x map scale 1000 * pixelsPerMapMillimeter * metersPerPixel ); console.log("scaleNominator = ", scaleNominator); var data = canvas.toDataURL("image/jpeg"); pdf.addImage(data, "JPEG", 0, 0, width, height); self.addScaleBar(pdf, width, height, scaleNominator); self.addNorthArrow(pdf, 15, 9, northarrowSize); self.addPageInfo(pdf); self.addAboutBox(pdf, width, height); if (self.getLayerByName("Bottleneck isolines").isVisible) { self.addLegend(pdf, width, height); } pdf.save("map.pdf"); // reset to original size map.setSize(mapSize); map.getView().fit(mapExtent, { size: mapSize }); // as we are done: re-enable button self.readyToGenerate = true; }); // trigger rendering this.prepareRendering(function() { map.setSize(mapSizeForPrint); map.getView().fit(mapExtent, { size: mapSizeForPrint }); /* let a = document.createElement("a"); a.href = src; // need the generated PDF in here (as dataURL?) if (this.form.downloadType === "download") a.download = src.substr(src.lastIndexOf("/") + 1); else a.target = "_blank"; document.body.appendChild(a); a.click(); document.body.removeChild(a); */ }); }, prepareRendering(callback) { // call callback() once the preparations are done this.logoImageForPDF = new Image(); this.logoImageForPDF.onload = function() { callback(); }; if (this.logoForPDF) { this.logoImageForPDF.src = this.logoForPDF; } else { this.logoImageForPDF.src = "/img/gemma-logo-for-pdf.png"; } }, addRoundedBox(doc, x, y, w, h) { // draws a rounded background box at (x,y) width x height // using jsPDF units doc.setDrawColor(255, 255, 255); doc.setFillColor(255, 255, 255); doc.roundedRect(x, y, w, h, 3, 3, "FD"); }, addScaleBar(doc, docWidth, docHeight, scaleNominator) { // scaleNominator is the x in 1:x of the map scale // hardcode maximal width for now and place in lower right corner let maxWidth = 80; // in mm // reduce width until we'll find a nice number for printing // strategy: // 1. check which unit prefix we shall use to get [10:10000[ // 2. using a mapping for the leading digit to get [1:10[ // 3. select a smaller number which is nicely dividable // 4. scale up again to get length in paper mm and to be shown // from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log10#Polyfill let log10 = Math.log10 || // more precise, but unsupported by IE function(x) { return Math.log(x) * Math.LOG10E; }; let maxLength = maxWidth * scaleNominator; let unit = "mm"; let unitConversionFactor = 1; if (maxLength >= 1e7) { // >= 10 km unit = "km"; unitConversionFactor = 1e6; } else if (maxLength >= 1e4) { // >= 10 m unit = "m"; unitConversionFactor = 1e3; } maxLength /= unitConversionFactor; // DEBUG console.log(maxLength, unit); let unroundedLength = maxLength; let numberOfDigits = Math.floor(log10(unroundedLength)); let factor = Math.pow(10, numberOfDigits); let mapped = unroundedLength / factor; // DEBUG console.log(mapped); var length = Math.floor(maxLength); // just to have an upper limit // manually only use numbers that are very nice to devide by 4 // note that this is taken into account for rounding later if (mapped > 8) { length = 8 * factor; } else if (mapped > 4) { length = 4 * factor; } else if (mapped > 2) { length = 2 * factor; } else { length = factor; } let size = (length * unitConversionFactor) / scaleNominator / 4; let x = docWidth - (size * 4 + 8); let y = docHeight - 6; this.addRoundedBox(doc, x - 4, y - 4, size * 4 + 12, 10); doc.setDrawColor(0, 0, 0); doc.setFillColor(0, 0, 0); doc.rect(x, y, size, 1, "FD"); doc.setFillColor(255, 255, 255); doc.setDrawColor(0, 0, 0); doc.rect(x + size, y, size, 1, "FD"); doc.setFillColor(0, 0, 0); doc.setDrawColor(0, 0, 0); doc.rect(x + size * 2, y, size * 2, 1, "FD"); doc.setFontSize(5); doc.text(x, y + 3, "0"); // /4 and could give 2.5. We still round, because of floating point arith doc.text( x + size, y + 3, (Math.round((length * 10) / 4) / 10).toString() ); doc.text(x + size * 2, y + 3, Math.round(length / 2).toString()); doc.text(x + size * 4, y + 3, Math.round(length).toString() + " " + unit); }, addNorthArrow(doc, x1, y1, size) { var y2 = y1 + size * 3; var x3 = x1 - size * 2; var y3 = y1 + size * 5; var x4 = x1 + size * 2; //white triangle doc.setFillColor(255, 255, 255); doc.setDrawColor(255, 255, 255); doc.triangle(x3 - 0.8, y3 + 1.2, x1, y1 - 1.2, x1, y2 + 0.6, "F"); doc.triangle(x1, y1 - 1.2, x1, y2 + 0.6, x4 + 0.8, y3 + 1.2, "F"); //north arrow doc.setDrawColor(0, 0, 0); doc.setFillColor(255, 255, 255); doc.triangle(x3, y3, x1, y1, x1, y2, "FD"); doc.setFillColor(0, 0, 0); doc.triangle(x1, y1, x1, y2, x4, y3, "FD"); doc.setFontSize(size * 3.1); doc.setTextColor(255, 255, 255); doc.setFontStyle("bold"); doc.text(size < 3 ? x1 - 0.5 : x1 - 1.3, y3 + 1, "N"); doc.setFontSize(size * 3); doc.setTextColor(0, 0, 0); doc.setFontStyle("normal"); doc.text(size < 3 ? x1 - 0.5 : x1 - 1.3, y3 + 1, "N"); }, // add some text at specific coordinates and determine how many wrolds in single line addText(doc, postitionX, positionY, size, color, lineWidth, text) { // split the incoming string to an array, each element is a string of words in a single line var textLines = doc.splitTextToSize(text, lineWidth); // get the longest line to fit the white backround to it var longestString = ""; textLines.forEach(function(element) { if (element.length > longestString.length) longestString = element; }); var indexOfMaxString = textLines.indexOf(longestString); // white background (rectangular) around the text doc.setFillColor(255, 255, 255); doc.setDrawColor(255, 255, 255); doc.rect( postitionX - doc.getStringUnitWidth(textLines[indexOfMaxString]) / size, size > 10 ? positionY - size / 1.8 : positionY - size / 2.4, doc.getStringUnitWidth(textLines[indexOfMaxString]) * (size / 2.6), textLines.length * (size / 2), "FD" ); //rounded rectangular /* doc.roundedRect( postitionX - doc.getStringUnitWidth(textLines[indexOfMaxString]) / size, size > 10 ? positionY - size / 1.8 : positionY - size / 2.6, doc.getStringUnitWidth(textLines[indexOfMaxString]) * (size / 2.6), textLines.length * (size / 2), 3, 3, "FD" ); */ doc.setTextColor(color); doc.setFontSize(size); doc.text(postitionX, positionY, textLines); }, addPageInfo(doc) { this.addRoundedBox(doc, 0, 0, 110, 8); let str = this.$gettext("Date of publication:") + " " + new Date().toLocaleString(locale2) + " " + this.$gettext("– generated by:") + " " + this.user; this.addText(doc, 5, 5, 9, "black", 100, str); }, addAboutBox(doc, docWidth, docHeight) { let top = docHeight - 20; this.addRoundedBox(doc, 0, top, 120, 20); let logoImage = this.logoImageForPDF; let aspectRatio = logoImage.width / logoImage.height; doc.addImage(logoImage, "PNG", 5, docHeight - 19, 110, 110 / aspectRatio); let str = "Dislaimer: Lorem ipsum dolor sit amet, consectetur adipisici elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua."; this.addText(doc, 5, docHeight - 6, 8, "black", 115, str); }, addLegend(doc, docWidth) { // transforming into an HTMLImageElement only to find out // the width x height of the legend image // FUTURE: find a better way to get the width and height let legendImage = new Image(); legendImage.src = this.isolinesLegendImgDataURL; let aspectRatio = legendImage.width / legendImage.height; this.addRoundedBox(doc, docWidth - 54, 0, 54, 50 / aspectRatio + 4); doc.addImage(legendImage, docWidth - 52, 2, 50, 50 / aspectRatio); } } }; </script>