|
 Line chart X label problem. |
| Posted by taejin Kim on Aug-10-2021 12:49 |
|
Hi~~
I have problem for display x label.
I use vector. y value is temperature, x value is distance.
vector size is about 900 and I want to display regular distance.
ex)
(95, 1.2),
(96, 1.3),
(93, 1.9),
(97, 2.4),
(95, 2.7),
(96, 3.3),
(93, 3.9),
(97, 4.5),
...
I want to display x label 1,2,3,4
Any information will helpful.
Please let me know....
Thanks.... |
| Re: Line chart X label problem. |
| Posted by Peter Kwan on Aug-10-2021 14:35 |
|
Hi taejin Kim,
Since you mention "vector", I assume you are using C++.
Suppose you have two data arrays in:
std::vector<double> yData;
std::vector<double> xData;
If you want to plot a line a line chart, you can use:
LineLayer *layer = c->addLineLayer(DoubleArray(&(yData[0]), yData.size()), 0xff0000, "My Line");
layer->setXData(DoubleArray(&(xData[0]), xData.size()));
Do not use Axis.setLabels to configure the x-axis labels. By using setXData to provide the x-coordinates, ChartDirector will automatically determine the x-axis scale and labels based on your data. The x-axis will be like the y-axis. The labels will depend on your data.
If you want to specify the x-axis scale yourself, you can use Axis.setLinearScale:
// Scale from 0 to 10, with each label incremented by 1 so that the labels are
// 0, 1, 2, 3, ...., 10.
c->xAxis()->setLinearScale(0, 10, 1);
The followings are some examples that uses setXData. You can see the labels are automatic:
https://www.advsofteng.com/doc/cdcpp.htm#xyline.htm
https://www.advsofteng.com/doc/cdcpp.htm#multicolorline.htm
https://www.advsofteng.com/doc/cdcpp.htm#multiline2.htm
Hope this can help.
Regards
Peter Kwan |
| Re: Line chart X label problem. |
| Posted by taejin Kim on Aug-10-2021 16:55 |
|
Thanks. I just solved it.
Key point is
"Do not use Axis.setLabels to configure the x-axis labels."
use
"setXData"
Many thanks again. |
|
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