C++ Builder 10.2 Tokyo > TeeChart > 系列の描画座標を取得する

動作環境

RAD Studio 10.2 Tokyo Update 3
TeeChart Standard v2016.17.160129 32bit VCL

概要

• TeeChartのSeries1の描画座標を取得する
  • SVG出力などに使う

実装例

Series1に対する関数を入力補完中にCalcXPos()を見つけた。

Unit1.cpp

void __fastcall TForm1::Button1Click(TObject *Sender)
{
	int len = Series1->Count();

	float xval, yval;
	int xpos, ypos;
	String msg;

	for(int idx=0; idx < len; idx++) {
		xval = Series1->XValue[idx];
		yval = Series1->YValue[idx];
		xpos = Series1->CalcXPos(idx);
		ypos = Series1->CalcYPos(idx);
		msg = String().sprintf(L"%.2f, %.2f at %d, %d", xval, yval, xpos, ypos);
		Memo1->Lines->Add(msg);
	}
}

コード全部

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.Series.hpp>
#include <VclTee.TeeGDIPlus.hpp>
#include <VCLTee.TeEngine.hpp>
#include <VCLTee.TeeProcs.hpp>
//---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published:	// IDE で管理されるコンポーネント
	TChart *Chart1;
	TButton *Button1;
	TLineSeries *Series1;
	TMemo *Memo1;
	void __fastcall Button1Click(TObject *Sender);
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 <memory>
#include <DateUtils.hpp>
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
	: TForm(Owner)
{
	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);
	}

	//
	Memo1->Lines->Clear();
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
	int len = Series1->Count();

	float xval, yval;
	int xpos, ypos;
	String msg;

	for(int idx=0; idx < len; idx++) {
		xval = Series1->XValue[idx];
		yval = Series1->YValue[idx];
		xpos = Series1->CalcXPos(idx);
		ypos = Series1->CalcYPos(idx);
		msg = String().sprintf(L"%.2f, %.2f at %d, %d", xval, yval, xpos, ypos);
		Memo1->Lines->Add(msg);
	}
}
//---------------------------------------------------------------------------

実行例