fix issue #436

[gilbertogalvis]

This PR fix the issues posted in issue #436

Example 1

load carsmall
tbl = table(Horsepower,MPG,Cylinders);
s = scatterhistogram(tbl,'Horsepower','MPG', ...
		  'GroupVariable','Cylinders','HistogramDisplayStyle','smooth', ...
		  'LineStyle','-');

fig2plotly(gcf);

Example 2

x0 = randn(100,1)./5. + 0.5;
y0 = randn(100,1)./5. + 0.5;
x1 = rand(50,1);
y1 = rand(50,1) + 1.0;

x = [x0; x1];
y = [y0; y1];

trace1 = struct(...
  'x', x0, ...
  'y', y0, ...
  'mode', 'markers', ...
  'marker', struct(...
    'symbol', 'circle', ...
    'opacity', 0.7), ...
  'type', 'scatter');

trace2 = struct(...
  'x', x1, ...
  'y', y1, ...
  'mode', 'markers', ...
  'marker', struct(...
    'symbol', 'square', ...
    'opacity', 0.7), ...
  'type', 'scatter');

trace3 = struct(...
  'x', x, ...
  'y', y, ...
  'type', 'histogram2d');

data = {trace1, trace2, trace3};

plotly(data);

This particular issue is because you are not setting the layout for the legend (you are leaving it by default). Then plotly position the legend wherever (in this case under the colorbar)

To fix it, you only have to configure the legend in the layout struct, in such a way that you correctly specify its position (avoiding that it is below the colorbar).

For this, please use the following code

x0 = randn(100,1)./5. + 0.5;
y0 = randn(100,1)./5. + 0.5;
x1 = rand(50,1);
y1 = rand(50,1) + 1.0;

x = [x0; x1];
y = [y0; y1];

trace1 = struct(...
		'x', x0, ...
		'y', y0, ...
		'mode', 'markers', ...
		'marker', struct(...
		  'symbol', 'circle', ...
		  'opacity', 0.7), ...
		'type', 'scatter');

trace2 = struct(...
		'x', x1, ...
		'y', y1, ...
		'mode', 'markers', ...
		'marker', struct(...
		  'symbol', 'square', ...
		  'opacity', 0.7), ...
		'type', 'scatter');

trace3 = struct(...
		'x', x, ...
		'y', y, ...
		'type', 'histogram2d');

data = {trace1, trace2, trace3};

layout = struct(...
		  'legend', struct(...
		'y', 1.0, ...
		'yanchor', 'bottom', ...
		'x', 1.0, ...
		'xanchor', 'right'), ...
		  'xaxis', struct('zeroline', false), ...
		  'yaxis', struct('zeroline', false) ...
		  );

plotly(data, struct('layout', layout));

Example 3

x = 2*randn(1000,1)+2;
y = 5*randn(1000,1)+3;
h = histogram2(x,y,'DisplayStyle','tile','ShowEmptyBins','on');

fig2plotly(gcf);