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How to add legends in map canvas when exported to PDF ol5

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1

Here is my code to export map in PDF and map is successfully exported to PDF
Now i want to add legends in map canvas but i do not know how to do that.

    var exportElement =  document.getElementById("export-pdf");

      exportElement.addEventListener('click', function(e) {



            exportElement.disabled = true;

            document.body.style.cursor = 'progress';



      var format = document.getElementById('format').value;

      var resolution = document.getElementById('resolution').value;

      var buttonLabelElement = document.getElementById('button-label');

      var label = buttonLabelElement.innerText;

      var scale = 8000;



    var mapView = map.getView();

    var mapProjection = mapView.getProjection();

    var mapResolutionAtEquator = mapView.getResolution();

    var viewCenter = mapView.getCenter();

    var mapPointResolution = ol.proj.getPointResolution(mapProjection, mapResolutionAtEquator, viewCenter);



    var dim = dims[format];

    var width = Math.round(dim[0] * resolution / 25.4);

    var height = Math.round(dim[1] * resolution / 25.4);

    var size = map.getSize();

    var extent = map.getView().calculateExtent(size);



    var mapView = map.getView();

    var mapProjection = mapView.getProjection();

    var mapResolutionAtEquator = mapView.getResolution();

    var viewCenter = mapView.getCenter();

    var mapResolutionAtEquator = mapView.getResolution();

    var mapPointResolution = ol.proj.getPointResolution(mapProjection, mapResolutionAtEquator, viewCenter);

    var mapResolutionFactor = mapResolutionAtEquator / mapPointResolution;

    var pdf_name = dist + "_" + tahsil + "_"+village+ ".pdf";

    map.once('rendercomplete', function(event) {



         buttonLabelElement.innerText = label;

          var canvas = event.context.canvas;

          var data = canvas.toDataURL('image/jpeg');

          var pdf = new jsPDF('landscape', undefined, format);

          pdf.addImage(data, 'JPEG', 0, 0, dim[0], dim[1]);

          pdf.save(pdf_name);

          map.setSize(size);

          map.getView().fit(extent, size);

          map.renderSync();

          exportElement.disabled = false;

              document.body.style.cursor = 'auto';

    }); 





    var printPointResolution = (scale * 25.4) /(resolution * 1000); 

    var printResolutionAtEquator = mapResolutionFactor * printPointResolution;

    var printZoom = mapView.getZoomForResolution(printResolutionAtEquator);        



    map.setSize([width, height]);

    mapView.setZoom(printZoom);

    map.renderSync();

   }, false);

openlayers

share|improve this question

edited 1 min ago

sanju verma

asked yesterday

sanju vermasanju verma

388

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If your legend is an image take a look at step 2 in this answer stackoverflow.com/questions/41805963/…
  
  – Mike
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  my legends is not an image its just a color that shows boundary of district and village.
  
  – sanju verma
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  So it's a layer?
  
  – TomazicM
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Question title mentions ol3. Code above uses getZoomForResolution method, so it's at least for ol4.
  
  – TomazicM
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes TomazicM i edited the question for ol5.
  
  – sanju verma
  13 secs ago
  

  
  
  
  

add a comment | 

1

Here is my code to export map in PDF and map is successfully exported to PDF
Now i want to add legends in map canvas but i do not know how to do that.

    var exportElement =  document.getElementById("export-pdf");

      exportElement.addEventListener('click', function(e) {



            exportElement.disabled = true;

            document.body.style.cursor = 'progress';



      var format = document.getElementById('format').value;

      var resolution = document.getElementById('resolution').value;

      var buttonLabelElement = document.getElementById('button-label');

      var label = buttonLabelElement.innerText;

      var scale = 8000;



    var mapView = map.getView();

    var mapProjection = mapView.getProjection();

    var mapResolutionAtEquator = mapView.getResolution();

    var viewCenter = mapView.getCenter();

    var mapPointResolution = ol.proj.getPointResolution(mapProjection, mapResolutionAtEquator, viewCenter);



    var dim = dims[format];

    var width = Math.round(dim[0] * resolution / 25.4);

    var height = Math.round(dim[1] * resolution / 25.4);

    var size = map.getSize();

    var extent = map.getView().calculateExtent(size);



    var mapView = map.getView();

    var mapProjection = mapView.getProjection();

    var mapResolutionAtEquator = mapView.getResolution();

    var viewCenter = mapView.getCenter();

    var mapResolutionAtEquator = mapView.getResolution();

    var mapPointResolution = ol.proj.getPointResolution(mapProjection, mapResolutionAtEquator, viewCenter);

    var mapResolutionFactor = mapResolutionAtEquator / mapPointResolution;

    var pdf_name = dist + "_" + tahsil + "_"+village+ ".pdf";

    map.once('rendercomplete', function(event) {



         buttonLabelElement.innerText = label;

          var canvas = event.context.canvas;

          var data = canvas.toDataURL('image/jpeg');

          var pdf = new jsPDF('landscape', undefined, format);

          pdf.addImage(data, 'JPEG', 0, 0, dim[0], dim[1]);

          pdf.save(pdf_name);

          map.setSize(size);

          map.getView().fit(extent, size);

          map.renderSync();

          exportElement.disabled = false;

              document.body.style.cursor = 'auto';

    }); 





    var printPointResolution = (scale * 25.4) /(resolution * 1000); 

    var printResolutionAtEquator = mapResolutionFactor * printPointResolution;

    var printZoom = mapView.getZoomForResolution(printResolutionAtEquator);        



    map.setSize([width, height]);

    mapView.setZoom(printZoom);

    map.renderSync();

   }, false);

openlayers

share|improve this question

edited 1 min ago

sanju verma

asked yesterday

sanju vermasanju verma

388

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If your legend is an image take a look at step 2 in this answer stackoverflow.com/questions/41805963/…
  
  – Mike
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  my legends is not an image its just a color that shows boundary of district and village.
  
  – sanju verma
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  So it's a layer?
  
  – TomazicM
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Question title mentions ol3. Code above uses getZoomForResolution method, so it's at least for ol4.
  
  – TomazicM
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes TomazicM i edited the question for ol5.
  
  – sanju verma
  13 secs ago
  

  
  
  
  

add a comment | 

Here is my code to export map in PDF and map is successfully exported to PDF
Now i want to add legends in map canvas but i do not know how to do that.

    var exportElement =  document.getElementById("export-pdf");

      exportElement.addEventListener('click', function(e) {



            exportElement.disabled = true;

            document.body.style.cursor = 'progress';



      var format = document.getElementById('format').value;

      var resolution = document.getElementById('resolution').value;

      var buttonLabelElement = document.getElementById('button-label');

      var label = buttonLabelElement.innerText;

      var scale = 8000;



    var mapView = map.getView();

    var mapProjection = mapView.getProjection();

    var mapResolutionAtEquator = mapView.getResolution();

    var viewCenter = mapView.getCenter();

    var mapPointResolution = ol.proj.getPointResolution(mapProjection, mapResolutionAtEquator, viewCenter);



    var dim = dims[format];

    var width = Math.round(dim[0] * resolution / 25.4);

    var height = Math.round(dim[1] * resolution / 25.4);

    var size = map.getSize();

    var extent = map.getView().calculateExtent(size);



    var mapView = map.getView();

    var mapProjection = mapView.getProjection();

    var mapResolutionAtEquator = mapView.getResolution();

    var viewCenter = mapView.getCenter();

    var mapResolutionAtEquator = mapView.getResolution();

    var mapPointResolution = ol.proj.getPointResolution(mapProjection, mapResolutionAtEquator, viewCenter);

    var mapResolutionFactor = mapResolutionAtEquator / mapPointResolution;

    var pdf_name = dist + "_" + tahsil + "_"+village+ ".pdf";

    map.once('rendercomplete', function(event) {



         buttonLabelElement.innerText = label;

          var canvas = event.context.canvas;

          var data = canvas.toDataURL('image/jpeg');

          var pdf = new jsPDF('landscape', undefined, format);

          pdf.addImage(data, 'JPEG', 0, 0, dim[0], dim[1]);

          pdf.save(pdf_name);

          map.setSize(size);

          map.getView().fit(extent, size);

          map.renderSync();

          exportElement.disabled = false;

              document.body.style.cursor = 'auto';

    }); 





    var printPointResolution = (scale * 25.4) /(resolution * 1000); 

    var printResolutionAtEquator = mapResolutionFactor * printPointResolution;

    var printZoom = mapView.getZoomForResolution(printResolutionAtEquator);        



    map.setSize([width, height]);

    mapView.setZoom(printZoom);

    map.renderSync();

   }, false);

openlayers

share|improve this question

edited 1 min ago

sanju verma

asked yesterday

sanju vermasanju verma

388

    var exportElement =  document.getElementById("export-pdf");

      exportElement.addEventListener('click', function(e) {



            exportElement.disabled = true;

            document.body.style.cursor = 'progress';



      var format = document.getElementById('format').value;

      var resolution = document.getElementById('resolution').value;

      var buttonLabelElement = document.getElementById('button-label');

      var label = buttonLabelElement.innerText;

      var scale = 8000;



    var mapView = map.getView();

    var mapProjection = mapView.getProjection();

    var mapResolutionAtEquator = mapView.getResolution();

    var viewCenter = mapView.getCenter();

    var mapPointResolution = ol.proj.getPointResolution(mapProjection, mapResolutionAtEquator, viewCenter);



    var dim = dims[format];

    var width = Math.round(dim[0] * resolution / 25.4);

    var height = Math.round(dim[1] * resolution / 25.4);

    var size = map.getSize();

    var extent = map.getView().calculateExtent(size);



    var mapView = map.getView();

    var mapProjection = mapView.getProjection();

    var mapResolutionAtEquator = mapView.getResolution();

    var viewCenter = mapView.getCenter();

    var mapResolutionAtEquator = mapView.getResolution();

    var mapPointResolution = ol.proj.getPointResolution(mapProjection, mapResolutionAtEquator, viewCenter);

    var mapResolutionFactor = mapResolutionAtEquator / mapPointResolution;

    var pdf_name = dist + "_" + tahsil + "_"+village+ ".pdf";

    map.once('rendercomplete', function(event) {



         buttonLabelElement.innerText = label;

          var canvas = event.context.canvas;

          var data = canvas.toDataURL('image/jpeg');

          var pdf = new jsPDF('landscape', undefined, format);

          pdf.addImage(data, 'JPEG', 0, 0, dim[0], dim[1]);

          pdf.save(pdf_name);

          map.setSize(size);

          map.getView().fit(extent, size);

          map.renderSync();

          exportElement.disabled = false;

              document.body.style.cursor = 'auto';

    }); 





    var printPointResolution = (scale * 25.4) /(resolution * 1000); 

    var printResolutionAtEquator = mapResolutionFactor * printPointResolution;

    var printZoom = mapView.getZoomForResolution(printResolutionAtEquator);        



    map.setSize([width, height]);

    mapView.setZoom(printZoom);

    map.renderSync();

   }, false);

share|improve this question

edited 1 min ago

sanju verma

asked yesterday

sanju vermasanju verma

388

share|improve this question

edited 1 min ago

sanju verma

asked yesterday

sanju vermasanju verma

388

asked yesterday

sanju vermasanju verma

388

asked yesterday

sanju vermasanju verma

388