Plotting a TChart with time as the X-axis

Question

I have a series of 3,600 values, one every second for an hour. I want to chart them as a single series, using TChart in Delphi 7.

The values should be plotted on the Y-axis. What should I pass to AddXY() as the X-axis value? The count of points?

I want to label the X-axis as MM:SS, how do I do that? What do I need beyond this? ...

   Chart1.Series[0].XValues.DateTime := True;
   Chart1.BottomAxis.DateTimeFormat := 'nn:ss';

I have been stuck for a while with this one. Can anyone post some sample code? Thanks

SimaWB · Answer 1 · 2011-01-25T08:55:24.377

4

You can use Add function instead of AddXY.

Add( 100, FormatDateTime('nn:ss',Now), clRed ); 
Add( 80, FormatDateTime('nn:ss',Now), clRed );

edited Jan 25 '11 at 08:55

answered Jan 25 '11 at 08:24

SimaWB

9,246
2
41
46

+1 This looks like what I want. I will try it out & get back to you. Thanks – Mawg says reinstate Monica Jan 25 '11 at 09:20
The problem with Add() function is actually you are adding strings but not DateTime, so you dont have Datetime scale on y-axis – Bharat Jan 25 '11 at 09:48
@Bharat: I think LeonixSolutions wants only labels like 'nn:ss' for X axis. – SimaWB Jan 25 '11 at 09:54

score 3 · Accepted Answer · answered Jan 25 '11 at 08:16

3

If I am not wrong, this is what you want

Series1.AddXY(<Pass the data value>, <Pass Your value>, '', clRed);
Series1.AddXY(now,                     1, '', clRed); 
Series1.AddXY(now + ( 1 /(24*60*60)),  2, '', clRed); //After 1 seconds 
Series1.AddXY(now + ( 2 /(24*60*60)),  3, '', clRed);  //After 2 seconds

answered Jan 25 '11 at 08:16

Bharat

6,828
5
35
56

+1 Yes, that looks like it, although I suspect that Add() might be better for me than AddXY(). Thnaks – Mawg says reinstate Monica Jan 25 '11 at 09:21
2

@Leonix: The problem with Add() function is actually you are adding strings but not DateTime, so you dont have Datetime scale on y-axis – Bharat Jan 25 '11 at 09:47
1

@Loenix: That depends on your requirement. If you want show your data w.r.t. to time you can use this option. – Bharat Feb 04 '11 at 06:43

Plotting a TChart with time as the X-axis

2 Answers2

Linked