java - GWT Google Visualization Column Chart using style roles -

i've made column chart gwt project, , having trouble finding way change colours of columns. there 1 serie , looking use call style roles. know how in javascript shown here, having trouble doing in gwt?

what have:

what want:

in order different colors, should have different series. try (not tested)

  private datatable createtable() {          datatable data = datatable.create();                data.addrows(4);           data.addcolumn(columntype.string, "metal");                 data.addcolumn(columntype.number, "density");          data.setvalue(0, 0, "copper" );         data.setvalue(1, 0, "silver");         data.setvalue(2, 0, "gold");         data.setvalue(3, 0, "platinum" );          data.setvalue(0, 1, 9);// 9 value of density           data.setvalue(1, 1, 11 );              data.setvalue(2, 1, 19);                data.setvalue(3, 1, 21);           return data;         }      }      private options createoptions() {         options options = options.create();             string[] colorarray = {"#b87333","#c0c0c0","#ffd700","#e5e4e2"};         options.setcolors(colorarray);         //other options          return options;     } 

edit

so first solution didn't achieve desired display, in order working, workaround necessary because api provided gwt doesn't offer such option.

you should have column , row each element. in order have each bar aligned label property isstacked has set true. here working example.

other options available here

import com.google.gwt.core.client.entrypoint; import com.google.gwt.user.client.ui.flowpanel; import com.google.gwt.user.client.ui.panel; import com.google.gwt.user.client.ui.rootpanel; import com.google.gwt.visualization.client.abstractdatatable; import com.google.gwt.visualization.client.abstractdatatable.columntype; import com.google.gwt.visualization.client.datatable; import com.google.gwt.visualization.client.visualizationutils; import com.google.gwt.visualization.client.visualizations.corechart.barchart; import com.google.gwt.visualization.client.visualizations.corechart.options;  public class testbar implements entrypoint {      public void onmoduleload() {         final flowpanel flowpanel = new flowpanel();         panel panel = rootpanel.get();         panel.add(flowpanel);         runnable onloadcallback = new runnable() {             public void run() {                 barchart bar = new barchart(createtable(), createoptions());                 flowpanel.add(bar);                 }         };         visualizationutils.loadvisualizationapi(onloadcallback, barchart.package);     }      private abstractdatatable createtable() {         datatable data = datatable.create();         data.addcolumn(columntype.string, "metal");         data.addcolumn(columntype.number, "copper");         data.addcolumn(columntype.number, "silver");         data.addcolumn(columntype.number, "gold");         data.addcolumn(columntype.number, "platinum");         data.addrows(4);          data.setvalue(0, 0, "copper");         data.setvalue(0, 1, 9);          data.setvalue(1, 0, "silver");         data.setvalue(1, 2, 11);          data.setvalue(2, 0, "gold");         data.setvalue(2, 3, 19);          data.setvalue(3, 0, "platinum");         data.setvalue(3, 4, 21);          return data;     }      private options createoptions() {         options options = getnativeoptions();         string[] colorarray = { "#b87333", "#c0c0c0", "#ffd700", "#e5e4e2" };         options.setcolors(colorarray);         return options;     }      private native options getnativeoptions() /*-{         var options = @com.google.gwt.visualization.client.visualizations.corechart.options::create()();         options = {             fontname : 'calibri',             fontsize : 12,             width: 600,             height: 400,             isstacked : true,             orientation : 'horizontal',             legend: { position: "bottom" },         };         return options;     }-*/; } 

the result