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  hours and minutes positioning on a scatter chart
Posted by Massimo Brillante on Jun-26-2013 19:54
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Hi,

I have a scatter chart with double values on the Y axis and time in the format of HH:mm
in the X axis. It seems that the values are not exactly positioned, for example in the
attached image the 10:58 and 10:59 values should be nearer the 11:00 line.

I am passing the time values as doubles and I am thinking if this may be the issue
part of the  code I am using is this:

  double[] dataY0 = Morning.ToArray();
      double[] dataY1 = Afternoon.ToArray();
      double[] dataY2 = Evening.ToArray();
      double[] dataY3 = Night.ToArray();

      String[] labels = {"00","01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11",
"12", "13", "14", "15", "16", "17","18", "19", "20", "21", "22", "23","00"};

// Create a XYChart object of size 800 x 360 pixels. Use a vertical gradient
      XYChart c = new XYChart(800, 360);

      // color from sky blue (aaccff) to white (ffffff) as background. Set border to
      // grey (888888). Use rounded corners. Enable soft drop shadow.
      c.setBackground(c.linearGradientColor(0, 0, 0, c.getHeight(), 0xaaccff, 0xffffff
         ), 0x888888);
      c.setRoundedFrame();
      c.setDropShadow();

      // Set the plotarea at (100, 80) and of size 600 x 230 pixels, with white
      // (ffffff) background. Use grey #(aaaaa) dotted lines for both horizontal and
      // vertical grid lines.
      c.setPlotArea(100, 80, 600, 230, 0xffffff, -1, -1, c.dashLineColor(0xaaaaaa,
         Chart.DotLine), -1);

      // Add a legend box with the bottom center anchored at (300, 80) (top center of
      // the plot area). Use horizontal layout, and 8 points Arial Bold font. Set
      // background and border to transparent.
      LegendBox legendBox = c.addLegend(400, 50, false, "Arial Bold", 12);
      legendBox.setAlignment(Chart.TopCenter);
      legendBox.setBackground(Chart.Transparent, Chart.Transparent);

      //Add a title to the chart using 14 points Times Bold Itatic font
      c.addTitle(ChartHeader, "Arial Bold", 14);

      //'Reserve 10% margin at the top of the plot area just to make sure the line does
      //'not go too near the top of the plot area
      c.yAxis().setAutoScale(0);

      //Add a title to the y axis. Draw the title upright (font angle = 0)
      c.yAxis().setTitle("Values (mmol/L)", "Arial Bold", 12).setFontAngle(90);

      c.xAxis().setTitle("Hour of measurement", "Arial Bold", 12);

      //c.xAxis().setLabels2(labels, "{value|0:00.0}");

      c.xAxis().setLabels(labels);
      // c.xAxis().setLabelFormat("{value|hh}");

      //Set the axes line width to 3 pixels
      c.xAxis().setWidth(3);
      c.yAxis().setWidth(3);

      //Add an orange (0xff9933) scatter chart layer, using 13 pixel diamonds as //symbols
for morning
      c.addScatterLayer(dataX0, dataY0, "Morning", Chart.DiamondSymbol, 9, 0xff9933);

      //Add a green (0x33ff33) scatter chart layer, using 11 pixel triangles as symbols for
aftermoom
      c.addScatterLayer(dataX1, dataY1, "Afternoon", Chart.SquareSymbol, 9, 0x33ff33);

      //Add a blue (0X7AA4D5) scatter chart layer, using 11 pixel triangles as symbols for
evening
      c.addScatterLayer(dataX2, dataY2, "Evening", Chart.TriangleSymbol, 9, 0X7AA4D5);

      //Add a black (0X000000) scatter chart layer, using 11 pixel triangles as symbols for
night
      c.addScatterLayer(dataX3, dataY3, "Night", Chart.InvertedTriangleSymbol, 9,
0XFFFF00);


any ideas on how I could get a better positioning of the values?
ScatterChartValues.png
ScatterChartValues.png
24.98 Kb

  Re: hours and minutes positioning on a scatter chart
Posted by Massimo Brillante on Jun-26-2013 22:25
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I've got it.. was my bad in converting timestamp values to double; I know use this method
TimeValue = double.Parse(HoursMins[0]) + double.Parse(HoursMins[1]) / 60;

rather than TimeValue = double.Parse(HoursMins[0]) + double.Parse(HoursMins[1]);