adding a new row at the end creates a stair step in the middle of the chart

avicene Tue, 14 Sep 2010 14:26:16 -0700

I don't know why when i add a new row at  the end of the data set it
changes the coordinates in the middle of the chart.
compare theses tow graphs in the google chart playground to see the
difference.
First:
function drawVisualization() {
      var options = {
        cht:     'lxy',
        chxt:   'x,y',
        chg:    '4.1666,12.5,1,2',
        chco:    'FFEFE9,FFD3C2,B7D4FD,37872B',
        chm:    'b,FF632620,0,1,0|b,
00AAEF20,2,4,0,0.6246110925674438',
        chls:    '1,1,0|1,1,0|1,1,0|3,1,0|1,1,0',
        chdlp:  'b',
        chxl:    '0:|12am|4am|8am|12pm|4pm|8pm|12am|1:||60 F||70 F||80
F||90 F|',
        chxs:    '0,383838,12,0,l|1,60C941,12,0,lt',
          width: 510,
          height: 240};


      var dataTable = new google.visualization.DataTable();
      dataTable.addColumn('number');
      dataTable.addColumn('number');
      dataTable.addColumn('number');
      dataTable.addColumn('number');
      dataTable.addColumn('number');
      dataTable.addColumn('number');
      dataTable.addColumn('number');
      dataTable.addColumn('number');
      dataTable.addColumn('number');
      dataTable.addColumn('number');
    dataTable.addRows([ [0,100,0,75.0,0,25.0,0,75.0,0,0],
[100,100,33.333336,75.0,33.333336,25.0,1.041,75.0,100,0],
[null,null,33.333336,50.0,33.333336,40.0,1.041,75.0,null,null],
[null,null,75.0,50.0,75.0,40.0,2.082,75.0,null,null],
[null,null,75.0,75.0,75.0,25.0,2.082,75.0,null,null],
[null,null,100,75.0,100,25.0,3.123,75.0,null,null],
[null,null,null,null,null,null,3.123,75.0,null,null],
[null,null,null,null,null,null,4.164,75.0,null,null],
[null,null,null,null,null,null,4.164,75.0,null,null],
[null,null,null,null,null,null,5.205,75.0,null,null],
[null,null,null,null,null,null,5.205,75.0,null,null],
[null,null,null,null,null,null,6.246,75.0,null,null],
[null,null,null,null,null,null,6.246,75.0,null,null],
[null,null,null,null,null,null,7.287,75.0,null,null],
[null,null,null,null,null,null,7.287,75.0,null,null],
[null,null,null,null,null,null,8.328,75.0,null,null],
[null,null,null,null,null,null,8.328,75.0,null,null],
[null,null,null,null,null,null,9.369,75.0,null,null],
[null,null,null,null,null,null,9.369,75.0,null,null],
[null,null,null,null,null,null,10.41,75.0,null,null],
[null,null,null,null,null,null,10.41,75.0,null,null],
[null,null,null,null,null,null,11.451,75.0,null,null],
[null,null,null,null,null,null,11.451,75.0,null,null],
[null,null,null,null,null,null,12.492,75.0,null,null],
[null,null,null,null,null,null,12.492,75.0,null,null],
[null,null,null,null,null,null,13.533,75.0,null,null],
[null,null,null,null,null,null,13.533,75.0,null,null],
[null,null,null,null,null,null,14.574,75.0,null,null],
[null,null,null,null,null,null,14.574,75.0,null,null],
[null,null,null,null,null,null,15.615,75.0,null,null],
[null,null,null,null,null,null,15.615,75.0,null,null],
[null,null,null,null,null,null,16.656,75.0,null,null],
[null,null,null,null,null,null,16.656,70.75,null,null],
[null,null,null,null,null,null,17.697,70.75,null,null],
[null,null,null,null,null,null,17.697,70.75,null,null],
[null,null,null,null,null,null,18.738,70.75,null,null],
[null,null,null,null,null,null,18.738,70.75,null,null],
[null,null,null,null,null,null,19.779,70.75,null,null],
[null,null,null,null,null,null,19.779,70.75,null,null],
[null,null,null,null,null,null,20.82,70.75,null,null],
[null,null,null,null,null,null,20.82,25.0,null,null],
[null,null,null,null,null,null,21.861,25.0,null,null],
[null,null,null,null,null,null,21.861,25.0,null,null],
[null,null,null,null,null,null,22.902,25.0,null,null],
[null,null,null,null,null,null,22.902,25.0,null,null],
[null,null,null,null,null,null,23.943,25.0,null,null],
[null,null,null,null,null,null,23.943,25.0,null,null],
[null,null,null,null,null,null,24.984,25.0,null,null],
[null,null,null,null,null,null,24.984,30.0,null,null],
[null,null,null,null,null,null,26.025,30.0,null,null],
[null,null,null,null,null,null,26.025,35.0,null,null],
[null,null,null,null,null,null,27.066,35.0,null,null],
[null,null,null,null,null,null,27.066,40.0,null,null],
[null,null,null,null,null,null,28.107,40.0,null,null],
[null,null,null,null,null,null,28.107,45.0,null,null],
[null,null,null,null,null,null,29.148,45.0,null,null],
[null,null,null,null,null,null,29.148,50.0,null,null],
[null,null,null,null,null,null,30.189,50.0,null,null],
[null,null,null,null,null,null,30.189,50.0,null,null],
[null,null,null,null,null,null,31.23,50.0,null,null],
[null,null,null,null,null,null,31.23,50.0,null,null],
[null,null,null,null,null,null,32.271,50.0,null,null],
[null,null,null,null,null,null,32.271,50.0,null,null],
[null,null,null,null,null,null,33.312,50.0,null,null],
[null,null,null,null,null,null,33.312,50.0,null,null],
[null,null,null,null,null,null,34.352,50.0,null,null],
[null,null,null,null,null,null,34.352,50.0,null,null],
[null,null,null,null,null,null,35.392,50.0,null,null],
[null,null,null,null,null,null,35.392,50.0,null,null],
[null,null,null,null,null,null,36.433,50.0,null,null],
[null,null,null,null,null,null,36.433,50.0,null,null],
[null,null,null,null,null,null,37.474,50.0,null,null],
[null,null,null,null,null,null,37.474,50.0,null,null],
[null,null,null,null,null,null,38.514,50.0,null,null],
[null,null,null,null,null,null,38.514,50.0,null,null],
[null,null,null,null,null,null,39.555,50.0,null,null],
[null,null,null,null,null,null,39.555,50.0,null,null],
[null,null,null,null,null,null,40.596,50.0,null,null]
]);


      var chart = new
google.visualization.ImageChart(document.getElementById('visualization'));
      chart.draw(dataTable, options);
}

Second:

function drawVisualization() {
      var options = {
        cht:     'lxy',
        chxt:   'x,y',
        chg:    '4.1666,12.5,1,2',
        chco:    'FFEFE9,FFD3C2,B7D4FD,37872B',
        chm:    'b,FF632620,0,1,0|b,
00AAEF20,2,4,0,0.6246110925674438',
        chls:    '1,1,0|1,1,0|1,1,0|3,1,0|1,1,0',
        chdlp:  'b',
        chxl:    '0:|12am|4am|8am|12pm|4pm|8pm|12am|1:||60 F||70 F||80
F||90 F|',
        chxs:    '0,383838,12,0,l|1,60C941,12,0,lt',
          width: 510,
          height: 240};

      var dataTable = new google.visualization.DataTable();
      dataTable.addColumn('number');
      dataTable.addColumn('number');
      dataTable.addColumn('number');
      dataTable.addColumn('number');
      dataTable.addColumn('number');
      dataTable.addColumn('number');
      dataTable.addColumn('number');
      dataTable.addColumn('number');
      dataTable.addColumn('number');
      dataTable.addColumn('number');
    dataTable.addRows([ [0,100,0,75.0,0,25.0,0,75.0,0,0],
[100,100,33.333336,75.0,33.333336,25.0,1.041,75.0,100,0],
[null,null,33.333336,50.0,33.333336,40.0,1.041,75.0,null,null],
[null,null,75.0,50.0,75.0,40.0,2.082,75.0,null,null],
[null,null,75.0,75.0,75.0,25.0,2.082,75.0,null,null],
[null,null,100,75.0,100,25.0,3.123,75.0,null,null],
[null,null,null,null,null,null,3.123,75.0,null,null],
[null,null,null,null,null,null,4.164,75.0,null,null],
[null,null,null,null,null,null,4.164,75.0,null,null],
[null,null,null,null,null,null,5.205,75.0,null,null],
[null,null,null,null,null,null,5.205,75.0,null,null],
[null,null,null,null,null,null,6.246,75.0,null,null],
[null,null,null,null,null,null,6.246,75.0,null,null],
[null,null,null,null,null,null,7.287,75.0,null,null],
[null,null,null,null,null,null,7.287,75.0,null,null],
[null,null,null,null,null,null,8.328,75.0,null,null],
[null,null,null,null,null,null,8.328,75.0,null,null],
[null,null,null,null,null,null,9.369,75.0,null,null],
[null,null,null,null,null,null,9.369,75.0,null,null],
[null,null,null,null,null,null,10.41,75.0,null,null],
[null,null,null,null,null,null,10.41,75.0,null,null],
[null,null,null,null,null,null,11.451,75.0,null,null],
[null,null,null,null,null,null,11.451,75.0,null,null],
[null,null,null,null,null,null,12.492,75.0,null,null],
[null,null,null,null,null,null,12.492,75.0,null,null],
[null,null,null,null,null,null,13.533,75.0,null,null],
[null,null,null,null,null,null,13.533,75.0,null,null],
[null,null,null,null,null,null,14.574,75.0,null,null],
[null,null,null,null,null,null,14.574,75.0,null,null],
[null,null,null,null,null,null,15.615,75.0,null,null],
[null,null,null,null,null,null,15.615,75.0,null,null],
[null,null,null,null,null,null,16.656,75.0,null,null],
[null,null,null,null,null,null,16.656,70.75,null,null],
[null,null,null,null,null,null,17.697,70.75,null,null],
[null,null,null,null,null,null,17.697,70.75,null,null],
[null,null,null,null,null,null,18.738,70.75,null,null],
[null,null,null,null,null,null,18.738,70.75,null,null],
[null,null,null,null,null,null,19.779,70.75,null,null],
[null,null,null,null,null,null,19.779,70.75,null,null],
[null,null,null,null,null,null,20.82,70.75,null,null],
[null,null,null,null,null,null,20.82,25.0,null,null],
[null,null,null,null,null,null,21.861,25.0,null,null],
[null,null,null,null,null,null,21.861,25.0,null,null],
[null,null,null,null,null,null,22.902,25.0,null,null],
[null,null,null,null,null,null,22.902,25.0,null,null],
[null,null,null,null,null,null,23.943,25.0,null,null],
[null,null,null,null,null,null,23.943,25.0,null,null],
[null,null,null,null,null,null,24.984,25.0,null,null],
[null,null,null,null,null,null,24.984,30.0,null,null],
[null,null,null,null,null,null,26.025,30.0,null,null],
[null,null,null,null,null,null,26.025,35.0,null,null],
[null,null,null,null,null,null,27.066,35.0,null,null],
[null,null,null,null,null,null,27.066,40.0,null,null],
[null,null,null,null,null,null,28.107,40.0,null,null],
[null,null,null,null,null,null,28.107,45.0,null,null],
[null,null,null,null,null,null,29.148,45.0,null,null],
[null,null,null,null,null,null,29.148,50.0,null,null],
[null,null,null,null,null,null,30.189,50.0,null,null],
[null,null,null,null,null,null,30.189,50.0,null,null],
[null,null,null,null,null,null,31.23,50.0,null,null],
[null,null,null,null,null,null,31.23,50.0,null,null],
[null,null,null,null,null,null,32.271,50.0,null,null],
[null,null,null,null,null,null,32.271,50.0,null,null],
[null,null,null,null,null,null,33.312,50.0,null,null],
[null,null,null,null,null,null,33.312,50.0,null,null],
[null,null,null,null,null,null,34.352,50.0,null,null],
[null,null,null,null,null,null,34.352,50.0,null,null],
[null,null,null,null,null,null,35.392,50.0,null,null],
[null,null,null,null,null,null,35.392,50.0,null,null],
[null,null,null,null,null,null,36.433,50.0,null,null],
[null,null,null,null,null,null,36.433,50.0,null,null],
[null,null,null,null,null,null,37.474,50.0,null,null],
[null,null,null,null,null,null,37.474,50.0,null,null],
[null,null,null,null,null,null,38.514,50.0,null,null],
[null,null,null,null,null,null,38.514,50.0,null,null],
[null,null,null,null,null,null,39.555,50.0,null,null],
[null,null,null,null,null,null,39.555,50.0,null,null],
[null,null,null,null,null,null,40.596,50.0,null,null],
[null,null,null,null,null,null,40.596,50.0,null,null]

]);


      var chart = new
google.visualization.ImageChart(document.getElementById('visualization'));
      chart.draw(dataTable, options);
}

Am i missing something here?
Thanks.

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adding a new row at the end creates a stair step in the middle of the chart

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