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unit Main;
{$mode objfpc}{$H+}
interface
uses
Classes, ComCtrls, ExtCtrls, StdCtrls, SysUtils, FileUtil, LResources, Forms,
Controls, Graphics, Dialogs, TAGraph, TASeries, TASources, TATools, Types, TAChartUtils;
type
{ TForm1 }
TForm1 = class(TForm)
cbSorted: TCheckBox;
chPoints: TChart;
chBarsBarSeries1: TBarSeries;
chPointsLineSeries1: TLineSeries;
chBars: TChart;
ctBars: TChartToolset;
ctBarsDataPointDragTool1: TDataPointDragTool;
ctPoints: TChartToolset;
ctPointsDataPointClickTool1: TDataPointClickTool;
ctPointsDataPointDragTool1: TDataPointDragTool;
ctPointsDataPointHintTool1: TDataPointHintTool;
PageControl1: TPageControl;
Panel1: TPanel;
RandomChartSource1: TRandomChartSource;
tsPoints: TTabSheet;
tsBars: TTabSheet;
procedure cbSortedChange(Sender: TObject);
procedure chPointsLineSeries1GetMark(out AFormattedMark: String;
AIndex: Integer);
procedure ctBarsDataPointDragTool1BeforeKeyDown(ATool: TChartTool;
APoint: TPoint);
procedure ctBarsDataPointDragTool1Drag(ASender: TDataPointDragTool;
var AGraphPoint: TDoublePoint);
procedure ctBarsDataPointDragTool1DragStart(ASender: TDataPointDragTool;
var AGraphPoint: TDoublePoint);
procedure ctPointsDataPointClickTool1PointClick(ATool: TChartTool;
APoint: TPoint);
procedure ctPointsDataPointHintTool1Hint(ATool: TDataPointHintTool;
const APoint: TPoint; var AHint: String);
procedure FormCreate(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.lfm}
uses
Math;
{ TForm1 }
procedure TForm1.cbSortedChange(Sender: TObject);
begin
chPointsLineSeries1.ListSource.Sorted := cbSorted.Checked;
end;
procedure TForm1.chPointsLineSeries1GetMark(
out AFormattedMark: String; AIndex: Integer);
begin
// Show item label for last dragged point.
if AIndex = ctPointsDataPointDragTool1.PointIndex then
with chPointsLineSeries1 do
AFormattedMark := Source.FormatItem(Marks.Format, AIndex, 0)
else
AFormattedMark := '';
end;
procedure TForm1.ctBarsDataPointDragTool1BeforeKeyDown(ATool: TChartTool;
APoint: TPoint);
begin
TDataPointDragTool(ATool).GrabRadius := chBarsBarSeries1.GetBarWidth(0);
end;
procedure TForm1.ctBarsDataPointDragTool1Drag(ASender: TDataPointDragTool;
var AGraphPoint: TDoublePoint);
begin
// Only allow vertical dragging.
AGraphPoint.X := ASender.Origin.X;
end;
procedure TForm1.ctBarsDataPointDragTool1DragStart(ASender: TDataPointDragTool;
var AGraphPoint: TDoublePoint);
const
Y_TOLERANCE = 3;
var
f: TGraphToImageFunc;
begin
f := @chBars.YGraphToImage;
if Abs(f(ASender.Origin.Y) - f(AGraphPoint.Y)) > Y_TOLERANCE then
ASender.Handled;
end;
procedure TForm1.ctPointsDataPointClickTool1PointClick(
ATool: TChartTool; APoint: TPoint);
var
pi: Integer;
begin
Unused(ATool, APoint);
pi := ctPointsDataPointClickTool1.PointIndex;
with chPointsLineSeries1 do
SetColor(pi, IfThen(GetColor(pi) = clRed, clTAColor, clRed));
end;
procedure TForm1.ctPointsDataPointHintTool1Hint(ATool: TDataPointHintTool;
const APoint: TPoint; var AHint: String);
begin
Unused(APoint);
AHint := 'Custom hint for point ' + IntToStr(ATool.PointIndex);
end;
procedure TForm1.FormCreate(Sender: TObject);
var
i: Integer;
begin
RandSeed := 675402;
for i := 1 to 10 do
chPointsLineSeries1.AddXY(i, Random(20) - 10);
chBarsBarSeries1.ListSource.CopyFrom(RandomChartSource1);
end;
end.
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