code: public static PlotCanvas plot(double[][] data) {
          double[] lowerBound = {-0.5, 0.36};
          double[] upperBound = {data[0].length, data.length * 0.87 + 0.5};
          PlotCanvas canvas = new PlotCanvas(lowerBound, upperBound, false);
          canvas.add(new Hexmap(data));
  
          canvas.getAxis(0).setFrameVisible(false);
          canvas.getAxis(0).setLabelVisible(false);
          canvas.getAxis(0).setGridVisible(false);
          canvas.getAxis(1).setFrameVisible(false);
          canvas.getAxis(1).setLabelVisible(false);
          canvas.getAxis(1).setGridVisible(false);
  
          return canvas;
      }
docs: Create a plot canvas with the pseudo hexmap plot of given data.
  @param data a data matrix to be shown in hexmap.