動作環境

C++ Builder XE4
TeeChart Lite v2013.08.130414 32bit VCL

関連

処理概要

グラフのX軸、Y軸の座標を取得したい
その座標情報は上記リンク記事のClicked(X, Y)などで使う

実装

How find top/left and top/right of the Teechart graph and Teechart Canvas?

ChartRectを使うとのこと。

Unit1.h

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

# ifndef Unit1H
# define Unit1H
//---------------------------------------------------------------------------
# include <System.Classes.hpp>
# include <Vcl.Controls.hpp>
# include <Vcl.StdCtrls.hpp>
# include <Vcl.Forms.hpp>
# include <Vcl.ExtCtrls.hpp>
# include <VCLTee.Chart.hpp>
# include <VCLTee.TeEngine.hpp>
# include <VCLTee.TeeProcs.hpp>
# include <VCLTee.Series.hpp>
//---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published:	// IDE で管理されるコンポーネント
	TChart *Chart1;
	TFastLineSeries *Series1;
	TMemo *Memo1;
	TButton *Button1;
	void __fastcall FormCreate(TObject *Sender);
	void __fastcall Button1Click(TObject *Sender);
	void __fastcall Chart1MouseDown(TObject *Sender, TMouseButton Button, TShiftState Shift,
          int X, int Y);
private:	// ユーザー宣言
public:		// ユーザー宣言
	__fastcall TForm1(TComponent* Owner);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
//---------------------------------------------------------------------------
# endif

Unit1.cpp

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

# include <vcl.h>
# pragma hdrstop

# include <DateUtils.hpp>
# include "Unit1.h"
//---------------------------------------------------------------------------
# pragma package(smart_init)
# pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
	: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormCreate(TObject *Sender)
{
    // ダミーデータの追加

    Chart1->Series[0]->XValues->DateTime = true;
    Chart1->BottomAxis->DateTimeFormat = L"nn:ss";

    TDateTime dt;

    dt = Now();

    double yval;
    for (int idx=0; idx < 10; idx++) {
        yval = (1+ idx) % 2;
        Series1->AddXY(dt, yval, "", clRed);
        dt = IncSecond(dt, 1);
    }
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
	Memo1->Lines->Clear();

	int xval, yval;
	String wrk;

	xval = Chart1->ChartRect.Left;
	wrk = "Left > X: " + IntToStr(xval);
	Memo1->Lines->Add(wrk);

	xval = Chart1->ChartRect.Right;
	wrk = "Right > X: " + IntToStr(xval);
	Memo1->Lines->Add(wrk);

	yval = Chart1->ChartRect.Top;
	wrk = "Top > Y: " + IntToStr(yval);
	Memo1->Lines->Add(wrk);

	yval = Chart1->ChartRect.Bottom;
	wrk = "Bottom > Y: " + IntToStr(yval);
	Memo1->Lines->Add(wrk);
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Chart1MouseDown(TObject *Sender, TMouseButton Button, TShiftState Shift,
          int X, int Y)
{
	String wrk = IntToStr(X) + L", " + IntToStr(Y);
	Memo1->Lines->Add(wrk);
}
//---------------------------------------------------------------------------

動作例

Button1押下
グラフの左Y軸上端をマウスクリック
グラフの下X軸右端をマウスクリック

X軸の両端、Y軸の両端がChartRectを使うことで取得できることが分かった。