px;" onclick="radio(1)" disabled="true">Lines</button>
        <button type="button" id="button_2" style="width: 180px;" onclick="radio(2)">Start point</button>
        <button type="button" id="button_3" style="width: 180px;" onclick="radio(3)">Stop distance</button>
    </center>
    </div>    
    <canvas id="solver_1" width=640 height=512></canvas>
    <div style="text-align:right; width:640px; padding-bottom:12pt;">
        <button type="button" id="reset_solver" onclick="reset_solver()">Reset</button>