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  decimal point and digits problem
Posted by taejin Kim on Mar-04-2022 14:17
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Hi ~~

I developed c#, window application.

my actual data is 0, 4, 8, 9.764, ...

winChartViewer1 shows 0.000, 4.000, 8.000, ...

tate too much places.

so I want it to 0.00, 4.00, 8.00, 9.76,...

please help me...


best regards,
ttt.png

  Re: decimal point and digits problem
Posted by Peter Kwan on Mar-04-2022 15:24
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Hi Taejin,

For numeric x data, there are two ways of handling the x data.

(a) You can add them to the chart as x-axis labels. With this method, the numbers are treated as names for display only. All data points are equally spaced horizontal regardless of what are the x values. The code is then:

// Add the line layer
c.addLineLayer(dataY, .....);

// The dataX are labels, formatted to 2 decimal places
c.xAxis().setLabels2(dataX, "{value|2}");

(b) You can use the x data as x-coordinates to position the data points. With this method, the data points can be unevenly spaced horizontally depending on the x-coordinates. The following is an example:

https://www.advsofteng.com/doc/cdnet.htm#unevenpoints.htm

The code in this case is like:

// Add the line layer
LineLayer layer = c.addLineLayer(dataY, ....);
// Use dataX as x-coordinates
layer.setXData(dataX);

The x-axis will then be automatically scaled similar to the y-axis. The labels are automatically determined by ChartDirector, and ChartDirector will not include unnecessary decimal points. You can also specify the x-axis scale manually using Axis.setLinearScale.

Regards
Peter Kwan

  Re: decimal point and digits problem
Posted by taejin Kim on Mar-11-2022 10:06
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I tried to layer to chart. Line and scatter.
However it dosn't work properly.

scatter image's position is a problem. -_-;;
Also if I trid down code, x Label "30" display twice.

What am I doing wrong?

private void Graph_Carbon()
{
    double[] data = { 0.85, 0.15};
    double[] labels = { 0, 30 };

    XYChart c = new XYChart(545, 250);
    c.setPlotArea(50, 20, 400, 180);

    c.addLegend(460, 100);
    c.yAxis().setTitle("C/02(kg/Nm³)");
    c.xAxis().setTitle("C(wt%x100)at meltdown");

    LineLayer layer = c.addLineLayer(data);
    c.xAxis().setLabels(labels);
    c.xAxis().setMinTickInc(3);

    //c.yAxis().setDateScale(0, 1.5);
    //c.xAxis().setDateScale(0, 30, 3);

    c.addText(180, 70, "Reduction Area");
    c.addText(180, 150, "Oxidation Area");


    // scatter Layer==============================
    double[] dataX0 = new double[1];
    double[] dataY0 = new double[1];

    dataX0[0] = 23;
    dataY0[0] = 0.52352941176470591;
    c.addScatterLayer(dataX0, dataY0, "position", Chart.CircleSymbol, 8, 0xff9933);

    // Output the chart
    winChartViewer1.Chart = c;

    //include tool tip for the chart
    //winChartViewer1.ImageMap = c.getHTMLImageMap("clickable", "", "title='{xLabel}: {value} GBytes'");
}

Regards,
doesntworkproperly.png

  Re: decimal point and digits problem
Posted by Peter Kwan on Mar-11-2022 12:20
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Hi taejin,

The issue is because the x-coordinates used for the line layer.

In your case, the labels = { 0, 30 } are used as the x-axis labels:

c.xAxis().setLabels(labels);

The labels are not related to the LineLayer and are not the x-coordinates of the line layer.

When the labels are set as the x-axis labels, it means they are just "names" for display. For example, it is common for charts to have repeating labels like { "0:00", "6:00", "12:00", "18:00", "0:00", "6:00", "12:00", "18"00", "0:00"}. These labels is for human reading and have no meaning to the computer, and cannot be used to specify x-position.

For your case, the LineLayer has no x-coordinates. ChartDirector will then use the array index 0, 1 as the x-coordinates of the two points. So it will match the first two labels {0, 30}. (The labels are also positioned using the array index.)

The scatter layer does have x-coordinate at x = 23. As the first two labels are at x = {0, 1}, and the scatter point is at x = 23, so it is at the far right side of the chart.


For your case, the plot what you want, you can use x-coordinates for the line layer. It is like:

double[] dataY = { 0.85, 0.15};
double[] dataX  = { 0, 30 };
LineLayer layer = c.addLineLayer(dataY);
layer.setXData(dataX);

//There is no need to set the labels if there are x-coordinates. ChartDirector
//can auto-scale the x-axis like how it auto-scale the y-axis.
//c.xAxis().setLabels(labels);
//c.xAxis().setMinTickInc(3);

The following is an example of using x-coordinates for the LineLayer.

https://www.advsofteng.com/doc/cdnet.htm#unevenpoints.htm

Hope this can help.

Regards
Peter Kwan