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C++ Builder XE4 > TeeChart > クリックした点に近い系列データの明示 > 点と値の表示 > v0.3: 線からはずれていても縦方向の走査により線を見つける

Last updated at Posted at 2018-11-18
動作環境
C++ Builder XE4
TeeChart Lite v2013.08.130414 32bit VCL

前回

UI > v0.1の問題点

v0.3

X座標はそのまま使い、Y座標はグラフの上端から下端までを走査する。

実装

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.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;
	TEdit *E_xvalue;
	TEdit *E_yvalue;
	TLabel *Label1;
	TLabel *Label2;
	TPointSeries *Series2;
	void __fastcall FormCreate(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)
{
    // テスト用の系列データ追加

    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);
    }
}
//---------------------------------------------------------------------------

#define POINT_NOT_FOUND (-1)

void __fastcall TForm1::Chart1MouseDown(TObject *Sender, TMouseButton Button, TShiftState Shift,
		  int X, int Y)
{
	// グラフ上端から下端まで走査してインデックスを見つける
	int top = Chart1->ChartRect.Top;
	int btm = Chart1->ChartRect.Bottom;
	int index = POINT_NOT_FOUND;  // 系列のインデックスが入る
	for(int ypos = top; ypos <= btm; ypos++) {
		index = Series1->Clicked(X, ypos);
		if (index != POINT_NOT_FOUND) {
			break;
		}
	}

    // A. クリックが外れていたときに消す
    if (index == POINT_NOT_FOUND) {
        if (Series2->Count() > 0) {
            Series2->Delete(0);
            E_xvalue->Text = L"";
            E_yvalue->Text = L"";
        }
        return;
    }

    // B. クリックが線上の時に表示

    // 既存のものは消す
    if (Series2->Count() > 0) {
        Series2->Delete(0);
    }

    // 点の追加
    double xval = Series1->XValue[index];
    double yval = Series1->YValue[index];
    Series2->AddXY(xval, yval);

    E_xvalue->Text = String().sprintf(L"%.3f", xval);
	E_yvalue->Text = String().sprintf(L"%.3f", yval);
}
//---------------------------------------------------------------------------

動作例

2018-11-18_13h45_49.png

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