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cachart.pas
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unit caChart;
{$INCLUDE ca.inc}
interface
uses
// Standard Delphi units
Windows,
Classes,
SysUtils,
Controls,
ExtCtrls,
Graphics,
// ca units
caGraphics,
caClasses,
caControls;
type
TcaAxisType = (axX, axY);
//---------------------------------------------------------------------------
// Forward declarations
//---------------------------------------------------------------------------
TcaChart = class;
//---------------------------------------------------------------------------
// IcaChartObject
//---------------------------------------------------------------------------
IcaChartObject = interface
['{C92F24EE-1E71-4AF5-9334-44B3B2943348}']
// Public methods
procedure Paint;
end;
//---------------------------------------------------------------------------
// TcaChartObject
//---------------------------------------------------------------------------
TcaChartObject = class(TcaInterfacedPersistent, IcaChartObject)
private
FChart: TcaChart;
// Property methods
protected
// Virtual methods
procedure Paint; virtual;
public
constructor Create(AChart: TcaChart);
end;
//---------------------------------------------------------------------------
// IcaChartAxis
//---------------------------------------------------------------------------
IcaChartAxis = interface
['{8628D8B6-5229-41CB-BD85-881DC970D406}']
// Property methods
function GetAxisType: TcaAxisType;
function GetMajorInterval: Double;
function GetMaxValue: Double;
function GetMinorInterval: Double;
function GetMinValue: Double;
function GetOnChanged: TNotifyEvent;
procedure SetMajorInterval(const Value: Double);
procedure SetMaxValue(const Value: Double);
procedure SetMinorInterval(const Value: Double);
procedure SetMinValue(const Value: Double);
procedure SetOnChanged(const Value: TNotifyEvent);
// Protected methods
procedure Paint;
// Properties
property AxisType: TcaAxisType read GetAxisType;
property MajorInterval: Double read GetMajorInterval write SetMajorInterval;
property MaxValue: Double read GetMaxValue write SetMaxValue;
property MinorInterval: Double read GetMinorInterval write SetMinorInterval;
property MinValue: Double read GetMinValue write SetMinValue;
property OnChanged: TNotifyEvent read GetOnChanged write SetOnChanged;
end;
//---------------------------------------------------------------------------
// TcaChartAxis
//---------------------------------------------------------------------------
TcaChartAxis = class(TcaChartObject, IcaChartAxis)
private
FAxisType: TcaAxisType;
FMajorInterval: Double;
FMaxValue: Double;
FMinorInterval: Double;
FMinValue: Double;
FOnChanged: TNotifyEvent;
// Property methods
function GetAxisType: TcaAxisType;
function GetMajorInterval: Double;
function GetMaxValue: Double;
function GetMinorInterval: Double;
function GetMinValue: Double;
function GetOnChanged: TNotifyEvent;
procedure SetMajorInterval(const Value: Double);
procedure SetMaxValue(const Value: Double);
procedure SetMinorInterval(const Value: Double);
procedure SetMinValue(const Value: Double);
procedure SetOnChanged(const Value: TNotifyEvent);
// Private methods
procedure Changed;
protected
procedure DoChanged; virtual;
procedure Paint; override;
public
constructor Create(AChart: TcaChart; AAxisType: TcaAxisType);
// Public properties
property AxisType: TcaAxisType read GetAxisType;
property OnChanged: TNotifyEvent read GetOnChanged write SetOnChanged;
published
// Published properties
property MajorInterval: Double read GetMajorInterval write SetMajorInterval;
property MaxValue: Double read GetMaxValue write SetMaxValue;
property MinorInterval: Double read GetMinorInterval write SetMinorInterval;
property MinValue: Double read GetMinValue write SetMinValue;
end;
//---------------------------------------------------------------------------
// IcaChartGrid
//---------------------------------------------------------------------------
IcaChartGrid = interface
['{F3D16104-1E39-4983-868B-1F1E03B50E21}']
// Property methods
function GetHeight: Integer;
function GetWidth: Integer;
function GetXAxis: TcaChartAxis;
function GetYAxis: TcaChartAxis;
procedure SetXAxis(const Value: TcaChartAxis);
procedure SetYAxis(const Value: TcaChartAxis);
// Protected methods
procedure Paint;
// Properties
property Height: Integer read GetHeight;
property Width: Integer read GetWidth;
property XAxis: TcaChartAxis read GetXAxis write SetXAxis;
property YAxis: TcaChartAxis read GetYAxis write SetYAxis;
end;
//---------------------------------------------------------------------------
// TcaChartGrid
//---------------------------------------------------------------------------
TcaChartGrid = class(TcaChartObject, IcaChartGrid)
private
FHeight: Integer;
FWidth: Integer;
FXAxis: TcaChartAxis;
FYAxis: TcaChartAxis;
// Property methods
function GetHeight: Integer;
function GetWidth: Integer;
function GetXAxis: TcaChartAxis;
function GetYAxis: TcaChartAxis;
procedure SetXAxis(const Value: TcaChartAxis);
procedure SetYAxis(const Value: TcaChartAxis);
protected
procedure Paint; override;
public
// Properties
property Height: Integer read GetHeight;
property Width: Integer read GetWidth;
property XAxis: TcaChartAxis read GetXAxis write SetXAxis;
property YAxis: TcaChartAxis read GetYAxis write SetYAxis;
end;
//---------------------------------------------------------------------------
// IcaChart
//---------------------------------------------------------------------------
IcaChart = interface
['{D52D84AF-6EC7-43A8-A0A1-2C778FD9CE30}']
function GetMargin: TcaMargin;
function GetXAxis: TcaChartAxis;
function GetYAxis: TcaChartAxis;
procedure SetMargin(const Value: TcaMargin);
procedure SetXAxis(const Value: TcaChartAxis);
procedure SetYAxis(const Value: TcaChartAxis);
// Properties
property Margin: TcaMargin read GetMargin write SetMargin;
property XAxis: TcaChartAxis read GetXAxis write SetXAxis;
property YAxis: TcaChartAxis read GetYAxis write SetYAxis;
end;
//---------------------------------------------------------------------------
// TcaChart
//---------------------------------------------------------------------------
TcaChart = class(TcaPanel, IcaChart)
private
FMargin: TcaMargin;
FGrid: TcaChartGrid;
FXAxis: TcaChartAxis;
FYAxis: TcaChartAxis;
// Property methods
function GetGrid: TcaChartGrid;
function GetMargin: TcaMargin;
function GetXAxis: TcaChartAxis;
function GetYAxis: TcaChartAxis;
procedure SetMargin(const Value: TcaMargin);
procedure SetXAxis(const Value: TcaChartAxis);
procedure SetYAxis(const Value: TcaChartAxis);
// Event handlers
procedure MarginChangedEvent(Sender: TObject);
procedure AxisChangedEvent(Sender: TObject);
protected
procedure Paint; override;
property Grid: TcaChartGrid read GetGrid;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
published
property Margin: TcaMargin read GetMargin write SetMargin;
property XAxis: TcaChartAxis read GetXAxis write SetXAxis;
property YAxis: TcaChartAxis read GetYAxis write SetYAxis;
end;
implementation
//---------------------------------------------------------------------------
// TcaChartObject
//---------------------------------------------------------------------------
// Virtual methods
constructor TcaChartObject.Create(AChart: TcaChart);
begin
inherited Create;
FChart := AChart;
end;
procedure TcaChartObject.Paint;
begin
// Virtual
end;
//---------------------------------------------------------------------------
// TcaChartAxis
//---------------------------------------------------------------------------
constructor TcaChartAxis.Create(AChart: TcaChart; AAxisType: TcaAxisType);
begin
inherited Create(AChart);
FAxisType := AAxisType;
end;
// Protected methods
procedure TcaChartAxis.DoChanged;
begin
if Assigned(FOnChanged) then FOnChanged(Self);
end;
procedure TcaChartAxis.Paint;
var
M: TcaMargin;
C: TCanvas;
Grid: TcaChartGrid;
Range: Double;
XFrom: Integer;
XTo: Integer;
YFrom: Integer;
YTo: Integer;
LineValue: Double;
begin
M := FChart.Margin;
C := FChart.Canvas;
Grid := FChart.Grid;
Range := FMaxValue - FMinValue;
if (FMinorInterval > 0) and (Round(Range / FMinorInterval) >= 2) then
begin
LineValue := FMinorInterval;
while LineValue < Range do
begin
if FAxisType = axX then
begin
XFrom := M.Left + Round(Grid.Width * LineValue / Range);
XTo := XFrom;
YFrom := M.Top;
YTo := M.Top + Grid.Height;
end
else
begin
XFrom := M.Left;
XTo := M.Left + Grid.Width;
YFrom := M.Top + Grid.Height - Round(Grid.Height * LineValue / Range);
YTo := YFrom;
end;
C.Pen.Color := clGray;
C.Pen.Style := psSolid;
C.MoveTo(XFrom, YFrom);
C.LineTo(XTo, YTo);
LineValue := LineValue + FMinorInterval;
end;
end;
end;
// Private methods
procedure TcaChartAxis.Changed;
begin
DoChanged;
end;
// Property methods
function TcaChartAxis.GetAxisType: TcaAxisType;
begin
Result := FAxisType;
end;
function TcaChartAxis.GetMajorInterval: Double;
begin
Result := FMajorInterval;
end;
function TcaChartAxis.GetMaxValue: Double;
begin
Result := FMaxValue;
end;
function TcaChartAxis.GetMinorInterval: Double;
begin
Result := FMinorInterval;
end;
function TcaChartAxis.GetMinValue: Double;
begin
Result := FMinValue;
end;
function TcaChartAxis.GetOnChanged: TNotifyEvent;
begin
Result := FOnChanged;
end;
procedure TcaChartAxis.SetMajorInterval(const Value: Double);
begin
FMajorInterval := Value;
Changed;
end;
procedure TcaChartAxis.SetMaxValue(const Value: Double);
begin
FMaxValue := Value;
Changed;
end;
procedure TcaChartAxis.SetMinorInterval(const Value: Double);
begin
FMinorInterval := Value;
Changed;
end;
procedure TcaChartAxis.SetMinValue(const Value: Double);
begin
FMinValue := Value;
Changed;
end;
procedure TcaChartAxis.SetOnChanged(const Value: TNotifyEvent);
begin
FOnChanged := Value;
end;
//---------------------------------------------------------------------------
// TcaChartGrid
//---------------------------------------------------------------------------
// Protected methods
procedure TcaChartGrid.Paint;
var
M: TcaMargin;
C: TCanvas;
R: IcaRect;
begin
M := FChart.Margin;
C := FChart.Canvas;
R := TcaRect.Create(FChart.ClientRect);
R.Adjust(M.Left, M.Top, -M.Right, -M.Bottom);
FWidth := R.Right - R.Left;
FHeight := R.Bottom - R.Top;
C.Pen.Color := clGray;
C.Pen.Style := psSolid;
C.MoveTo(R.Left, R.Top);
C.LineTo(R.Right, R.Top);
C.LineTo(R.Right, R.Bottom);
C.LineTo(R.Left, R.Bottom);
C.LineTo(R.Left, R.Top);
end;
// Property methods
function TcaChartGrid.GetHeight: Integer;
begin
Result := FHeight;
end;
function TcaChartGrid.GetWidth: Integer;
begin
Result := FWidth;
end;
function TcaChartGrid.GetXAxis: TcaChartAxis;
begin
Result := FXAxis;
end;
function TcaChartGrid.GetYAxis: TcaChartAxis;
begin
Result := FYAxis;
end;
procedure TcaChartGrid.SetXAxis(const Value: TcaChartAxis);
begin
FXAxis := Value;
end;
procedure TcaChartGrid.SetYAxis(const Value: TcaChartAxis);
begin
FYAxis := Value;
end;
//---------------------------------------------------------------------------
// TcaChart
//---------------------------------------------------------------------------
constructor TcaChart.Create(AOwner: TComponent);
begin
inherited;
FMargin := TcaMargin.Create;
FMargin.OnChanged := MarginChangedEvent;
FGrid := TcaChartGrid.Create(Self);
FXAxis := TcaChartAxis.Create(Self, axX);
FXAxis.OnChanged := AxisChangedEvent;
FYAxis := TcaChartAxis.Create(Self, axY);
FYAxis.OnChanged := AxisChangedEvent;
end;
destructor TcaChart.Destroy;
begin
FMargin.Free;
FGrid.Free;
FXAxis.Free;
FYAxis.Free;
inherited;
end;
// Protected methods
procedure TcaChart.Paint;
begin
inherited;
FGrid.Paint;
FXAxis.Paint;
FYAxis.Paint;
end;
// Event handlers
procedure TcaChart.AxisChangedEvent(Sender: TObject);
begin
Invalidate;
end;
procedure TcaChart.MarginChangedEvent(Sender: TObject);
begin
Invalidate;
end;
// Property methods
function TcaChart.GetGrid: TcaChartGrid;
begin
Result := FGrid;
end;
function TcaChart.GetMargin: TcaMargin;
begin
Result := FMargin;
end;
function TcaChart.GetXAxis: TcaChartAxis;
begin
Result := FXAxis;
end;
function TcaChart.GetYAxis: TcaChartAxis;
begin
Result := FYAxis;
end;
procedure TcaChart.SetMargin(const Value: TcaMargin);
begin
FMargin := Value;
end;
procedure TcaChart.SetXAxis(const Value: TcaChartAxis);
begin
FXAxis := Value;
end;
procedure TcaChart.SetYAxis(const Value: TcaChartAxis);
begin
FYAxis := Value;
end;
end.