mobile - How to avoid svg disappearing while zooming and panning? -


i trying build zoomable map mobile devices of hammer.js: http://www.informatik.uni-bremen.de/~hhappe/visuhappe/svgpan.html (try out in opera on mobile device). recreating following example svg file, embed img-tags: https://github.com/eightmedia/hammer.js/blob/master/examples/pinchzoom.html

while example working jpg file, in case svg (mapgartendeck.svg) disappears partially after first touch-gesture on mobile device (unfortunately, works in opera @ far.. don´t know why). svg boundaries seem shift while panning. tried out embed svg in different ways (object tags , svg tags) nothing solves problem; makes worse , touch not working @ all...

does know how solve problem? essentials code: ...

#pinchzoom {         -webkit-transform: translate3d(0,0,0);         overflow: hidden;     }

... in body:

<div id="pinchzoom" align="center">          <img id="thesvgelement" src="mapgartendeck.svg" alt="" width="639.86" height="400.12" viewport="-639.86 -400.12 639.855 400.117">         <!-- /*try out other ways embed svg:*/         <iframe height="450px" width="95%" src="mapgartendeck.svg" scrolling="no">                     <img id="thesvgelement" src="mapgartendeck.png" alt="mapgartendeck.png" width="689px" height="430.95px" left:"2.5px" />         </iframe>          <object id="thesvgelement" data="mapgartendeck.svg" type="image/svg+xml" width="95%" left="2.5px" style="display:block"></object>         -->      </div>

...

<script>       var hammertime = hammer(document.getelementbyid('pinchzoom'), {     transform_always_block: true,     transform_min_scale: 1,     drag_block_horizontal: true,     drag_block_vertical: true,     drag_min_distance: 0 });  var svg = document.getelementbyid('thesvgelement');  var posx=0, posy=0,     lastposx=0, lastposy=0,     scale=1, last_scale,     rotation= 1, last_rotation,     dt=0;  hammertime.on('touch drag transform dragend doubletap', function(ev) {     switch(ev.type) {         //rotate should left out          case 'touch':             last_scale = scale;             //last_rotation = rotation;             break;          case 'drag':             if(scale > 1){             posx = ev.gesture.deltax + lastposx;              posy = ev.gesture.deltay + lastposy;              }             break;          case 'transform':             //rotation = last_rotation + ev.gesture.rotation;             scale = math.max(1, math.min(last_scale * ev.gesture.scale, 10));             break;          case 'dragend':             lastposx = posx;             lastposy = posy;             break;          case 'doubletap':             if (dt == 0){                 dt=1;                 scale = 2;             }else if (dt ==1){                 dt = 0;                 scale = 1;                 posx=0;                 posy=0;             }last_scale = scale;             //last_rotation = rotation;             break;     }      // transform!     var transform =             "translate3d("+posx+"px,"+posy+"px, 0) " +             "scale3d("+scale+","+scale+", 0) ";              //+ "rotate("+rotation+"deg) ";       thesvgelement.style.transform = transform;     thesvgelement.style.otransform = transform;     thesvgelement.style.mstransform = transform;     thesvgelement.style.moztransform = transform;     thesvgelement.style.webkittransform = transform;  });


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