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 basic chart |
| Posted by Ckane on May-03-2012 06:40 |
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below is a code snippet. All values and arrays are valid.
Chart shows, but no axis' or data. Just a blank chart
What am I doing wrong?
XYChart c1 = new XYChart(720, 300, 0xccccff, 0x000000, 1);
c1.addTitle("DR Log Data", "Times New Roman Bold Italic", 15, 0xffffff).setBackground(0x000080)
LineLayer layer0 = c1.addLineLayer2();
layer0.addDataSet(data0, 0xff0000, "layer 0").setDataSymbol(Chart.GlassSphere2Shape, 11);
layer0.setLineWidth(3);
c1.setBackground(c1.linearGradientColor(0, 0, 0, 100, 0x99ccff, 0xffffff),0x888888);
c1.setRoundedFrame();
DateTime startDate = xaxis[0];
DateTime endDate = xaxis[numCol - 1];
c1.xAxis().setDateScale(startDate, endDate);
winChartViewer1.Image = c1.makeImage(); |
| Re: basic chart |
| Posted by Peter Kwan on May-03-2012 23:44 |
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Hi Ckane,
The issue is because your code has set up the x-axis scale, but it does not provide x-coordinates for your data points. So for the data points, ChartDirector will use the default x-coordinates, which are 0, 1, 2, 3, ..... (These coordinates are designed to work with a label based x-axis configured with Axis.setLabels, but not with the date scale x-axis.)
In general, ChartDirector will not assume the (x, y) data values to be determined by the axis scale. For example, if you set the y-axis scale as 0 to 100, your data values will not suddenly spread evenly from 0 to 100.
For your case, to solve the problem, you may use setXData or setXData2 to provide the x-coordinates of your data points. For example:
//assume the xaxis is an array that contains the coordinates of your data points
layer0.setXData(xaxis);
or
//Just spread the data points evenly between the startDate and endDate. This assumes
//your data points are evenly spaced in the x-direction.
layer0.setXData2(startDate, endDate);
Hope this can help.
Regards
Peter Kwan |
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