c++c++builderteechart

Teechart set num of decimals on Axis and hide Axis labels for further series

hope you can help me. In Builder C++ create a new "Windows VCL Application". Add a "Tchart" from "Palette". Right click on the chart -> Edit Chart -> Click on Series -> Add... -> Line -> Ok to create Series1 and repeat to create Series2. Close In Unit1.cpp copy my following sample:

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

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
#include <vector>
//---------------------------------------------------------------------------

#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------

__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)

{
    std::vector<float> x1, y1, x2, y2;

for (int i = 0; i < 2000; i++) {
     float r1 = static_cast <float> (rand()) / static_cast <float> (RAND_MAX);
     float r2 = static_cast <float> (rand()) / static_cast <float> (RAND_MAX);
     x1.push_back(i+r1);
     y1.push_back(r1);
     x2.push_back(i+r2);
     y2.push_back(r2);

}

Chart1->BottomAxis->AxisValuesFormat = "0.0";


for (unsigned i = 0; i < x1.size(); i++) {
    Chart1->Series[0]->AddY(y1[i], x1[i]);
    Chart1->Series[1]->AddY(y2[i], x2[i]);
}
}
//---------------------------------------------------------------------------

Compile and run. As you can see the values on the X axis appear overlapped.

chart

In order to solve I would

  1. display the X axis values with only 1 decimal
  2. hide the X axis labels for Series1 (i. e., Series2)

For the 1st point I've tried as you see in the code but it seems not working. Thank you very much in advance.

Solution

  • You are adding points to the Line series with the AddY method, passing the x values as the second parameter, which is the label.
    Doing so, the bottom axis labels indeed overlap.

    Instead, I'd use the AddXY method, passing the x values as the first parameter and the y values as the second:

    for (unsigned i = 0; i < x1.size(); i++) {
    Chart1->Series[0]->AddXY(x1[i], y1[i]);
    Chart1->Series[1]->AddXY(x2[i], y2[i]);
}

    This looks fine for me here:

    chart