From 04d113cfe594e417fb33f345174b3451eb4cd06d Mon Sep 17 00:00:00 2001
From: allyoucanmap <bovio.stefano@gmail.com>
Date: Wed, 8 Mar 2017 16:36:54 +0100
Subject: [PATCH] Removed shifted layer in snapshot

---
 .../map/leaflet/snapshot/GrabMap.jsx          | 57 ++++++++++++++++---
 .../snapshot/__tests__/Preview-test.jsx       |  4 +-
 2 files changed, 53 insertions(+), 8 deletions(-)

diff --git a/web/client/components/map/leaflet/snapshot/GrabMap.jsx b/web/client/components/map/leaflet/snapshot/GrabMap.jsx
index 588058f565..c2e1694032 100644
--- a/web/client/components/map/leaflet/snapshot/GrabMap.jsx
+++ b/web/client/components/map/leaflet/snapshot/GrabMap.jsx
@@ -136,24 +136,39 @@ let GrabLMap = React.createClass({
 
         // get all the informations needed to snap svg before
         let svgs = this.mapDiv.getElementsByTagName("svg");
-        let svg = svgs && svgs[0];
+        let svg = svgs && svgs[0] && svgs[0].cloneNode(true);
+        let svgOffsetX;
+        let svgOffsetY;
         let svgH;
         let svgW;
         let svgString;
         if (svg && svg.outerHTML) {
+            svgOffsetX = svgs[0] ? svgs[0].getBoundingClientRect().left : 0;
+            svgOffsetY = svgs[0] ? svgs[0].getBoundingClientRect().top : 0;
             svgString = svgs[0].outerHTML;
             svgW = svg.getAttribute("width");
             svgH = svg.getAttribute("height");
+            svg.setAttribute("style", "");
         }
         let left = 0;
         if (leftString) {
             left = parseInt( leftString.replace('px', ''), 10);
         }
 
-        const tilePane = this.mapDiv.getElementsByClassName("leaflet-tile-pane");
-        if (tilePane && tilePane.length > 0) {
-            let layers = [].slice.call(tilePane[0].getElementsByClassName("leaflet-layer"), 0);
-            layers.sort(function compare(a, b) {
+        // get pan position from translate 3d
+        let leafletPane = this.mapDiv.getElementsByClassName("leaflet-map-pane");
+        let panPosition = leafletPane && leafletPane[0] && leafletPane[0].style && leafletPane[0].style.transform ? leafletPane[0].style.transform.replace(/\(|\)|translate3d/g, '').split('px, ') : ['0', '0'];
+        panPosition = [Number.parseFloat(panPosition[0]), Number.parseFloat(panPosition[1])];
+        let tilePane = this.mapDiv.getElementsByClassName("leaflet-tile-pane");
+        // clone to change style attributes
+        let tilePaneClone = tilePane && tilePane[0].cloneNode(true);
+        // bring back to hide
+        tilePaneClone.style.zIndex = -9999;
+        // append to prevent html2canvas errors
+        document.body.appendChild(tilePaneClone);
+        if (tilePaneClone) {
+            let layers = [].slice.call(tilePaneClone.getElementsByClassName("leaflet-layer"), 0);
+            layers.sort(function(a, b) {
                 return Number.parseFloat(a.style.zIndex) - Number.parseFloat(b.style.zIndex);
             });
             let canvas = this.getCanvas();
@@ -162,9 +177,27 @@ let GrabLMap = React.createClass({
                 return;
             }
             context.clearRect(0, 0, canvas.width, canvas.height);
+
+            // remove transform style from every tile images and add left top attributes
+            let resetLayerStyles = function(l) {
+                for (let i = 0; i < l.children.length; i++) {
+                    if (l.children[i]) {
+                        for (let j = 0; j < l.children[i].children.length; j++) {
+                            if (l.children[i].children[j] && l.children[i].children[j].tagName === 'IMG') {
+                                l.children[i].children[j].style.position = 'absolute';
+                                l.children[i].children[j].style.left = l.children[i].children[j].getBoundingClientRect().left + left + panPosition[0] + 'px';
+                                l.children[i].children[j].style.top = l.children[i].children[j].getBoundingClientRect().top + panPosition[1] + 'px';
+                                l.children[i].children[j].style.transform = 'none';
+                            }
+                        }
+                    }
+                }
+            };
+
             let queue = layers.map((l) => {
                 let newCanvas = this.refs.canvas.cloneNode();
                 newCanvas.width = newCanvas.width + left;
+                resetLayerStyles(l);
                 return html2canvas(l, {
                         // you have to provide a canvas to avoid html2canvas to crop the image
                         canvas: newCanvas,
@@ -196,19 +229,29 @@ let GrabLMap = React.createClass({
 
                 });
                 let finialize = () => {
+                    // remove cloned panel from body
+                    document.body.removeChild(tilePaneClone);
+
                     this.props.onStatusChange("READY", this.isTainted(finalCanvas));
                     this.props.onSnapshotReady(canvas, null, null, null, this.isTainted(finalCanvas));
                 };
 
                 if (svg) {
                     let svgCanv = document.createElement('canvas');
-                    svgCanv.setAttribute("width", svgW);
+                    svgOffsetX = svgOffsetX ? svgOffsetX : 0;
+                    svgOffsetY = svgOffsetY ? svgOffsetY : 0;
+                    svgCanv.setAttribute("width", Number.parseFloat(svgW) + left);
                     svgCanv.setAttribute("height", svgH);
                     canvg(svgCanv, svgString, {
+                        ignoreMouse: true,
+                        ignoreAnimation: true,
+                        ignoreDimensions: true,
                         ignoreClear: true,
+                        offsetX: svgOffsetX,
+                        offsetY: svgOffsetY,
                         renderCallback: () => {
                             let ctx = finalCanvas.getContext('2d');
-                            ctx.drawImage(svgCanv, -1 * (svgW - finalCanvas.width) / 2, -1 * (svgH - finalCanvas.height) / 2);
+                            ctx.drawImage(svgCanv, -1 * left, 0);
                             finialize();
                         }
                     });
diff --git a/web/client/components/map/leaflet/snapshot/__tests__/Preview-test.jsx b/web/client/components/map/leaflet/snapshot/__tests__/Preview-test.jsx
index 78a36e97da..c2f1904fdd 100644
--- a/web/client/components/map/leaflet/snapshot/__tests__/Preview-test.jsx
+++ b/web/client/components/map/leaflet/snapshot/__tests__/Preview-test.jsx
@@ -16,7 +16,9 @@ describe("test the Leaflet Preview component", () => {
         // emulate empty map
         document.body.innerHTML = '<div><div id="snap"></div>' +
             '<div id="map" style="width:100%; height:100%"><canvas></canvas>' +
-                '<div class="leaflet-tile-pane"><div class="leaflet-layer"></div></div>' +
+                '<div class="leaflet-map-pane">' +
+                    '<div class="leaflet-tile-pane"><div class="leaflet-layer"></div></div>' +
+                '</div>' +
             '</div></div>';
         setTimeout(done);
     });