cannt change the color of marks

[elmec]

The color cannt be changed by the following code.
BTW, I am using the newest Teechart(2014) for C++Builder XE4 Firemonkey HD APP.

Code: Select all

//---------------------------------------------------------------------------

#include <fmx.h>
#pragma hdrstop
#include <iostream>
#include <string>

#include "Unit12.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)

#pragma resource "*.fmx"
TForm12 *Form12;


__fastcall TForm12::TForm12(TComponent* Owner)
	: TForm(Owner)
{

	seriesSeries1->Marks->Visible = true;
	seriesSeries1->AddXY(10,10, "aa", claRed);
	seriesSeries1->AddXY(20,10, "bb", claBlue);

}

[elmec]

changcolor.jpg (37.18 KiB) Viewed 16761 times

[Yeray]

Hello,

Is this a TLineSeries? I can't reproduce this with a TLineSeries.
If it's a TFastLineSeries, note this.

Reading the thread title again it mentions the marks. So I'm not sure if the intention of the code you posted was to set red and blue colors to the marks or to the line pen. If you want to change the marks colors, you have to use the corresponding Marks Items array after populating the series:

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   Chart1->View3D = false;

   TFastLineSeries *seriesSeries1 = new TFastLineSeries(this);
   Chart1->AddSeries(seriesSeries1);

   seriesSeries1->Marks->Visible = true;
   seriesSeries1->AddXY(10,10, "aa", claRed);
   seriesSeries1->AddXY(20,10, "bb", claBlue);

   seriesSeries1->Marks->Item[0]->Color = claRed;
   seriesSeries1->Marks->Item[1]->Color = claBlue;

[elmec]

Thank you.
I meant the label..and I used the TFastLineSeries...
SO I will change to TLineSeries and try again.

[elmec]

But I am confused about the result of the following code.

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    TFastLineSeries* line = new TFastLineSeries(Chart1);
    line->ParentChart = Chart1;
    line->Marks->Visible = true;

    line->FillSampleValues(10);

    // the count fo marks is  ZERO!!!   Even all the marks are showed just like in the attachment.
    ShowMessage(line->Marks->Items->Count);

[Yeray]

Hello,

The problem here is that the Marks->Items array is being populated as you access it; if you access the Marks->Item[index], the array is populated from the item 0 to the item being accessed, and Marks->Items->Count always indicates how many items are populated in the array.
Ie, if you access to the Item[0], then the Count will give you 1:

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	line->Marks->Item[0];
	ShowMessage(line->Marks->Items->Count);

Or, if you access the item[3], then the Count will give you 4:

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	line->Marks->Item[3];
	ShowMessage(line->Marks->Items->Count);

Then, if you want to get the complete Count, you have to access the last item. Ie:

Code: Select all

	line->Marks->Item[line->Count()-1];
	ShowMessage(line->Marks->Items->Count);

[elmec]

Thank you !