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unit Unit1;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs,
ExtCtrls, StdCtrls,
TAGraph, TASeries, TAStyles, TASources, TAChartListbox;
type
{ TForm1 }
TForm1 = class(TForm)
BtnAddBar: TButton;
BtnAddLevel: TButton;
BtnDelete: TButton;
CalculatedChartSource1: TCalculatedChartSource;
Chart1: TChart;
Chart1BarSeries1: TBarSeries;
CbPercent: TCheckBox;
ChartStyles1: TChartStyles;
ListBox1: TListBox;
ListChartSource1: TListChartSource;
Panel1: TPanel;
procedure BtnAddBarClick(Sender: TObject);
procedure BtnAddLevelClick(Sender: TObject);
procedure BtnDeleteClick(Sender: TObject);
procedure CbPercentChange(Sender: TObject);
private
public
end;
var
Form1: TForm1;
implementation
{$R *.lfm}
{ TForm1 }
const
N = 5;
procedure TForm1.BtnAddBarClick(Sender: TObject);
var
x, y: Double;
i, n: Integer;
style: TChartStyle;
begin
x := ListChartSource1.Count;
y := Random * 0.9 + 0.1; // Random number between 0.1 and 1.0
n := ListChartSource1.Add(x, y);
for i:=0 to ListChartSource1.YCount-2 do
ListChartSource1.Item[n]^.YList[i] := random;
if ChartStyles1.Styles.Count = 0 then begin
style := TChartStyle(ChartStyles1.Styles.Add);
style.Brush.Color := RgbToColor(random(256), random(256), random(256));
style.Text := 'Y';
Listbox1.Items.Add(style.Text);
end;
BtnDelete.Enabled := true;
end;
procedure TForm1.BtnAddLevelClick(Sender: TObject);
var
yidx: Integer;
i: Integer;
style: TChartStyle;
begin
// Increment the number of y values and add random data to the new y value
ListChartSource1.BeginUpdate;
try
yidx := ListChartSource1.YCount - 1;
ListChartSource1.YCount := ListChartSource1.YCount + 1;
for i := 0 to ListChartSource1.Count-1 do
ListChartSource1.Item[i]^.YList[yidx] := random;
finally
ListChartSource1.EndUpdate;
end;
style := TChartStyle(ChartStyles1.Styles.Add);
style.Brush.Color := RgbToColor(random(256), random(256), random(256));
style.Text := 'YList[' + IntToStr(yidx) + ']';
Listbox1.Items.Add(style.Text);
Listbox1.ItemIndex := Listbox1.Items.Count - 1;
BtnDelete.Enabled := true;
end;
procedure TForm1.BtnDeleteClick(Sender: TObject);
var
idx: Integer; // Index of level to be deleted
i, j: Integer;
begin
idx := Listbox1.ItemIndex;
if (ListChartSource1.YCount = 1) then begin
ListChartSource1.Clear;
exit;
end;
// Delete level in Listsource
ListChartSource1.BeginUpdate;
try
for i := 0 to ListChartSource1.Count-1 do begin
if idx = 0 then
ListChartSource1.Item[i]^.Y := ListChartSource1.Item[i]^.YList[0];
for j:=idx to ListChartSource1.YCount-3 do
ListChartSource1.Item[i]^.YList[j] := ListChartSource1.Item[i]^.YList[j+1];
end;
ListChartSource1.YCount := ListChartSource1.YCount - 1;
finally
ListChartSource1.EndUpdate;
end;
// Delete level in ChartStyles
ChartStyles1.Styles.Delete(idx);
// Delete item in Listbox
Listbox1.Items.Delete(idx);
if idx < Listbox1.Items.Count then
Listbox1.ItemIndex := idx
else
Listbox1.ItemIndex := Listbox1.Items.Count - 1;
BtnDelete.Enabled := Listbox1.Items.Count > 0;
end;
procedure TForm1.CbPercentChange(Sender: TObject);
begin
CalculatedChartSource1.Percentage := CbPercent.Checked;
end;
end.
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