% layout 'default';
<%= form_for gnuplot => begin %>
 <%= text_area 'sql', cols => 80, rows => 5 %>
 <br>with <%= select_field with => [qw(dots points steps lines)], 'dots' %>
 <%= submit_button 'execute' %>
<% end %>
% if ( $img ) {
<img src="<%= $img %>">
% }
<pre><%= $gnuplot %></pre>