BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Finding the series index for the data at the x-axis minimum          BorlandTalk.com Forum Index -> Delphi Reporting-Charting View previous topic :: View next topic   Author Message m610 Guest Posted: Thu Dec 07, 2006 9:12 am    Post subject: Finding the series index for the data at the x-axis minimum I'd like to be able to determine which item in a lineseries is located at/near the x-axis minimum (left y-axis) without having to search all my data (some 40,000 point) to find a close match. My searching procedure works OK, but it is clumbsy and a bit slow. I was hoping that TeeChart had a handy property I could read instead. Thanks in advance. Back to top David Berneda Guest Posted: Thu Dec 07, 2006 10:40 pm    Post subject: Re: Finding the series index for the data at the x-axis mini Hi http://www.steema.net/TeeChart6Docs/TChartSeries.FirstValueIndex.html When the line is displayed, the min and max indexes are internally calculated to avoid painting many points that might possible be outside the chart rectangle. These properties are available only *after* that chart has displayed. var a,b : Integer; a := Series1.FirstValueIndex; b: =Series1.LastValueIndex; They are "-1" meaning the whole series points ( from 0 to Series1.Count-1 ) need to be displayed. With these indexes you can then query the series values: var valueMin : Double; valueMin := Series1.YValues[ a ]; regards david www.teechart.com "m610" <mlmeier (AT) sbcglobal (DOT) net> wrote in message news:1165463322.790785.231110 (AT) n67g2000cwd (DOT) googlegroups.com... Quote: I'd like to be able to determine which item in a lineseries is located at/near the x-axis minimum (left y-axis) without having to search all my data (some 40,000 point) to find a close match. My searching procedure works OK, but it is clumbsy and a bit slow. I was hoping that TeeChart had a handy property I could read instead. Thanks in advance. Back to top m610 Guest Posted: Mon Dec 11, 2006 12:05 am    Post subject: Re: Finding the series index for the data at the x-axis mini Thanks. It worked perfectly and everything is running smooth and quick now. Mike David Berneda wrote: Quote: Hi http://www.steema.net/TeeChart6Docs/TChartSeries.FirstValueIndex.html When the line is displayed, the min and max indexes are internally calculated to avoid painting many points that might possible be outside the chart rectangle. These properties are available only *after* that chart has displayed. var a,b : Integer; a := Series1.FirstValueIndex; b: =Series1.LastValueIndex; They are "-1" meaning the whole series points ( from 0 to Series1.Count-1 ) need to be displayed. With these indexes you can then query the series values: var valueMin : Double; valueMin := Series1.YValues[ a ]; regards david www.teechart.com "m610" <mlmeier (AT) sbcglobal (DOT) net> wrote in message news:1165463322.790785.231110 (AT) n67g2000cwd (DOT) googlegroups.com... I'd like to be able to determine which item in a lineseries is located at/near the x-axis minimum (left y-axis) without having to search all my data (some 40,000 point) to find a close match. My searching procedure works OK, but it is clumbsy and a bit slow. I was hoping that TeeChart had a handy property I could read instead. Thanks in advance. 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