Chart组件的例子很少，让一些使用者用起来找不到头绪，现把我以前看过的一个比较好的例子拿出来与大家共同学习。
例图：
程序代码如下：
//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
#include "TeeBasic.h"
#include <stdlib.h>
#include <math.h>
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TDemoForm *DemoForm;
//---------------------------------------------------------------------------
__fastcall TDemoForm::TDemoForm(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------
TChart* TDemoForm::TheChart()
{
String S = Notebook1->Pages->Strings[0];
TPage* page = static_cast<TPage*>(Notebook1->Pages->Objects[Notebook1->PageIndex]);
return dynamic_cast<TChart*>(page->Controls[0]);
}
void TDemoForm::HorizScroll(const double Percent)
{
ScrollAxis(TheChart()->TopAxis,Percent);
ScrollAxis(TheChart()->BottomAxis,Percent);
Button3->Enabled=true;
}
void TDemoForm::VertScroll(const double Percent)
{
ScrollAxis(TheChart()->LeftAxis,Percent);
ScrollAxis(TheChart()->RightAxis,Percent);
Button3->Enabled=true;
}
void TDemoForm::ScrollAxis(TChartAxis* Axis, const double Percent)
{
double Amount = -((Axis->Maximum-Axis->Minimum)/(100.0/Percent));
Axis->SetMinMax(Axis->Minimum-Amount,Axis->Maximum-Amount);
}
void __fastcall TDemoForm::ListBox1Click(TObject *Sender)
{
Notebook1->PageIndex=ListBox1->ItemIndex;
tmpTimes=-1;
TheChart()->AnimatedZoom=true;
TheChart()->AnimatedZoomSteps=4;
for (int t=0;t<TheChart()->SeriesCount();t++)
TheChart()->Series[t]->FillSampleValues(
TheChart()->Series[t]->NumSampleValues());
TheChart()->UndoZoom();
CheckBox1->Checked =TheChart()->View3D;
ScrollBar2->Enabled =TheChart()->View3D;
ScrollBar2->Position=TheChart()->Chart3DPercent;
if (dynamic_cast<TPieSeries*>(TheChart()->Series[0]))
ScrollBar3->Position=TheChart()->View3DOptions->Elevation;
else
ScrollBar3->Position=TheChart()->View3DOptions->Rotation;
ScrollBar4->Position=TheChart()->View3DOptions->Elevation;
ScrollBar3->Enabled=TheChart()->View3D;
ScrollBar4->Enabled=TheChart()->View3D;
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::FormCreate(TObject *Sender)
{
tmpTimes=-1;
ScrollBar1->Position=Timer1->Interval;
ComboBox1->ItemIndex=0;
ComboBox2->ItemIndex=0;
ListBox1->ItemIndex =0;
ListBox1Click(this);
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::CheckBox1Click(TObject *Sender)
{
TheChart()->View3D=CheckBox1->Checked;
ScrollBar2->Enabled=TheChart()->View3D;
ScrollBar3->Enabled=TheChart()->View3D;
ScrollBar4->Enabled=TheChart()->View3D;
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::CheckBox2Click(TObject *Sender)
{
Timer1->Enabled=CheckBox2->Checked;
ScrollBar1->Enabled=Timer1->Enabled;
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::ScrollBar1Change(TObject *Sender)
{
Timer1->Interval=ScrollBar1->Position;
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::Timer1Timer(TObject *Sender)
{
double tmpX;
switch (Notebook1->PageIndex) {
case 0 :
case 3 :
case 4 :
case 6 : {
for (int t=0;t<TheChart()->SeriesCount();t++) {
tmpX=TheChart()->Series[t]->XValues->Value[1]-
TheChart()->Series[t]->XValues->Value[0];
TheChart()->Series[t]->Delete(0);
TheChart()->Series[t]->AddXY(
TheChart()->Series[t]->XValues->Last()+tmpX,
TheChart()->Series[t]->YValues->Last()+random(100)-50,"",clTeeColor);
}
break;
}
case 1 :
case 2 :
case 8 : {
if (tmpTimes==-1) {
tmpSeries=random(TheChart()->SeriesCount());
tmpIndex =random(TheChart()->Series[tmpSeries]->Count());
tmpTimes =random(10);
tmpRandom=2*floor((random(50)-25.0) + .5);
}
if (tmpSeries != -1) {
if (Notebook1->PageIndex == 8) {
TBubbleSeries* s =
dynamic_cast<TBubbleSeries*>(TheChart()->Series[tmpSeries]);
tmpX=s->RadiusValues->Value[tmpIndex]+tmpRandom;
if (tmpX>=2) {
s->RadiusValues->Value[tmpIndex]=tmpX;
if (tmpRandom>0)
tmpX=s->XValues->Value[tmpIndex]+1;
else
tmpX=s->XValues->Value[tmpIndex]-1;
s->XValues->Value[tmpIndex]=tmpX;
if (random(10)<5)
tmpX=s->YValues->Value[tmpIndex]+50;
else
tmpX=s->YValues->Value[tmpIndex]-50;
s->YValues->Value[tmpIndex]=tmpX;
}
else tmpTimes=0;
}
else
TheChart()->Series[tmpSeries]->MandatoryValueList()->Value[tmpIndex] =
TheChart()->Series[tmpSeries]->MandatoryValueList()->Value[tmpIndex]+tmpRandom;
tmpTimes--;
TheChart()->Repaint();
}
break;
}
case 5: {
TPieSeries* s = dynamic_cast<TPieSeries*>(TheChart()->Series[0]);
s->Rotate(358);
break;
}
}
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::Button2Click(TObject *Sender)
{
Close();
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::BitBtn1Click(TObject *Sender)
{
TheChart()->ZoomPercent(120);
Button3->Enabled=true;
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::BitBtn2Click(TObject *Sender)
{
TheChart()->ZoomPercent(80);
Button3->Enabled=true;
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::SpeedButton1Click(TObject *Sender)
{
HorizScroll(10);
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::SpeedButton4Click(TObject *Sender)
{
HorizScroll(-10);
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::SpeedButton2Click(TObject *Sender)
{
VertScroll(-10);
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::SpeedButton3Click(TObject *Sender)
{
VertScroll(10);
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::CheckBox3Click(TObject *Sender)
{
TPieSeries* s = dynamic_cast<TPieSeries*>(TheChart()->Series[0]);
s->Circled=CheckBox3->Checked;
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::ComboBox1Click(TObject *Sender)
{
TCustomBarSeries* s = dynamic_cast<TCustomBarSeries*>(TheChart()->Series[0]);
TComboBox* cb = dynamic_cast<TComboBox*>(Sender);
s->MultiBar=TMultiBar(cb->ItemIndex);
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::ScrollBar2Change(TObject *Sender)
{
TheChart()->Chart3DPercent=ScrollBar2->Position;
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::Series28GetMarkText(TChartSeries *Sender,
int ValueIndex, AnsiString &MarkText)
{
if (ValueIndex==3)
MarkText="USA";
else if (ValueIndex==5)
MarkText="UK";
else if (ValueIndex==7)
MarkText="Germany";
else
MarkText="";
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::Button3Click(TObject *Sender)
{
TheChart()->UndoZoom();
Button3->Enabled=false;
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::CheckBox4Click(TObject *Sender)
{
Series11->Stairs=CheckBox4->Checked;
Series12->Stairs=CheckBox4->Checked;
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::FormShow(TObject *Sender)
{
Timer1->Enabled=true; // <-- start animation
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::ScrollBar3Change(TObject *Sender)
{
if (ScrollBar3->Enabled )
TheChart()->View3DOptions->Orthogonal=false;
if (dynamic_cast<TPieSeries*>(TheChart()->Series[0]))
TheChart()->View3DOptions->Elevation=ScrollBar3->Position;
else
TheChart()->View3DOptions->Rotation=ScrollBar3->Position;
}
//---------------------------------------------------------------------------
void __fastcall TDemoForm::ScrollBar4Change(TObject *Sender)
{
if (ScrollBar4->Enabled) {
TheChart()->View3DOptions->Orthogonal=false;
TheChart()->View3DOptions->Elevation=ScrollBar4->Position;
}
}
//---------------------------------------------------------------------------
