C++ Builder XE4 > TeeChart > 다량 플롯 그리기 가속화 > 실행 코드(2019-04-11판)

C++ Builder XE4

2016년 3월 31일 기사 > 이해하기 어렵다

실행 가능 코드 (2019-04-11 버전)

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

#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.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;
    TFastLineSeries *Series1;
    TButton *Button1;
    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

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

#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::Button1Click(TObject *Sender)
{
    Chart1->Series[0]->XValues->DateTime = true;
    Chart1->BottomAxis->DateTimeFormat = L"nn:ss";

    TDateTime dt;

    dt = Now();

    int cnt = 0;
    TDoubleDynArray xs, ys;

    // 1. 既存データの読込み
    xs.Length += Series1->XValues->Count;
    ys.Length += Series1->XValues->Count;
    for(int idx=0; idx < Series1->XValues->Count; idx++) {
        xs[cnt] = Series1->XValues->Value[idx];
        ys[cnt] = Series1->YValues->Value[idx];
        cnt++;
    }

    // 2. 追加
    const int numData = 10;  // 追加データの個数
    xs.Length += numData;
    ys.Length += numData;
    double yval;
    for (int idx=0; idx < numData; idx++) {
        yval = (1+ idx) % 2;
        xs[cnt] = dt;
        ys[cnt] = yval;
        cnt++;
        //
        dt = IncMilliSecond(dt, 100);
    }
    Series1->XValues->Value = xs;
    Series1->XValues->Count = cnt;
    Series1->XValues->Modified = true;
    Series1->YValues->Value = ys;
    Series1->YValues->Count = cnt;
    Series1->YValues->Modified = true;

    Series1->Repaint();  // 描画の更新に必要
}
//---------------------------------------------------------------------------

실행 예

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