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{
*****************************************************************************
See the file COPYING.modifiedLGPL.txt, included in this distribution,
for details about the license.
*****************************************************************************
Authors: Alexander Klenin
}
unit TAAnimatedSource;
{$H+}
interface
uses
Classes, CustomTimer,
TAChartUtils, TACustomSource;
type
TCustomAnimatedChartSource = class;
TAnimatedChartSourceItemEvent = procedure (
ASender: TCustomAnimatedChartSource;
AIndex: Integer; var AItem: TChartDataItem) of object;
TAnimatedChartSourceEvent = procedure (
ASender: TCustomAnimatedChartSource) of object;
TCustomAnimatedChartSource = class(TCustomChartSource)
strict private
FAnimationInterval: Cardinal;
FAnimationTime: Cardinal;
FCurrentStep: Cardinal;
FItem: TChartDataItem;
FListener: TListener;
FOnGetItem: TAnimatedChartSourceItemEvent;
FOnStop: TAnimatedChartSourceEvent;
FOrigin: TCustomChartSource;
FProjectedSteps: Cardinal;
FSkippedFramesCount: Cardinal;
FStartTime: Cardinal;
FTimer: TCustomTimer;
procedure Changed(ASender: TObject);
procedure OnTimer(ASender: TObject);
procedure SetOrigin(AValue: TCustomChartSource);
protected
function GetCount: Integer; override;
function GetItem(AIndex: Integer): PChartDataItem; override;
procedure SetXCount(AValue: Cardinal); override;
procedure SetYCount(AValue: Cardinal); override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
function Extent: TDoubleRect; override;
function ExtentCumulative: TDoubleRect; override;
function ExtentList: TDoubleRect; override;
function IsAnimating: Boolean; inline;
function Progress: Double; inline;
procedure Start;
procedure Stop(ACallEvent: Boolean = false);
property CurrentStep: Cardinal read FCurrentStep;
property ProjectedSteps: Cardinal read FProjectedSteps;
property SkippedFramesCount: Cardinal read FSkippedFramesCount;
published
property AnimationInterval: Cardinal
read FAnimationInterval write FAnimationInterval default 0;
property AnimationTime: Cardinal
read FAnimationTime write FAnimationTime default 0;
property Origin: TCustomChartSource read FOrigin write SetOrigin;
published
property OnGetItem: TAnimatedChartSourceItemEvent
read FOnGetItem write FOnGetItem;
property OnStop: TAnimatedChartSourceEvent read FOnStop write FOnStop;
end;
implementation
uses
LCLIntf, Math, SysUtils;
{ TCustomAnimatedChartSource }
procedure TCustomAnimatedChartSource.Changed(ASender: TObject);
begin
Unused(ASender);
Notify;
end;
constructor TCustomAnimatedChartSource.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FListener := TListener.Create(@FOrigin, @Changed);
FTimer := TCustomTimer.Create(nil);
FTimer.Enabled := false;
FTimer.OnTimer := @OnTimer;
end;
destructor TCustomAnimatedChartSource.Destroy;
begin
FreeAndNil(FTimer);
FreeAndNil(FListener);
inherited;
end;
function TCustomAnimatedChartSource.Extent: TDoubleRect;
begin
if Origin = nil then
Result := EmptyExtent
else
Result := Origin.Extent;
end;
function TCustomAnimatedChartSource.ExtentCumulative: TDoubleRect;
begin
if Origin = nil then
Result := EmptyExtent
else
Result := Origin.ExtentCumulative;
end;
function TCustomAnimatedChartSource.ExtentList: TDoubleRect;
begin
if Origin = nil then
Result := EmptyExtent
else
Result := Origin.ExtentList;
end;
function TCustomAnimatedChartSource.GetCount: Integer;
begin
if Origin = nil then
Result := 0
else
Result := Origin.Count;
end;
function TCustomAnimatedChartSource.GetItem(AIndex: Integer): PChartDataItem;
begin
if Origin = nil then exit(nil);
if not IsAnimating then exit(Origin.Item[AIndex]);
FItem := Origin.Item[AIndex]^;
Result := @FItem;
if Assigned(OnGetItem) then
OnGetItem(Self, AIndex, FItem);
end;
function TCustomAnimatedChartSource.IsAnimating: Boolean;
begin
Result := FTimer.Enabled;
end;
procedure TCustomAnimatedChartSource.OnTimer(ASender: TObject);
var
d, s: Cardinal;
begin
Unused(ASender);
d := GetTickCount64 - FStartTime;
if d >= AnimationTime then
Stop(true);
s := Round(d * ProjectedSteps / AnimationTime);
if FCurrentStep + 1 <> s then
FSkippedFramesCount += 1;
FCurrentStep := s;
Notify;
end;
function TCustomAnimatedChartSource.Progress: Double;
begin
if ProjectedSteps = 0 then
Result := 0
else
Result := (FCurrentStep - 1) / ProjectedSteps;
end;
procedure TCustomAnimatedChartSource.SetOrigin(AValue: TCustomChartSource);
begin
if AValue = Self then
AValue := nil;
if FOrigin = AValue then exit;
if FOrigin <> nil then
FOrigin.Broadcaster.Unsubscribe(FListener);
FOrigin := AValue;
if FOrigin <> nil then
FOrigin.Broadcaster.Subscribe(FListener);
end;
procedure TCustomAnimatedChartSource.SetXCount(AValue: Cardinal);
begin
Unused(AValue);
raise EXCountError.Create('Cannot set XCount');
end;
procedure TCustomAnimatedChartSource.SetYCount(AValue: Cardinal);
begin
Unused(AValue);
raise EYCountError.Create('Cannot set YCount');
end;
procedure TCustomAnimatedChartSource.Start;
begin
Stop;
FSkippedFramesCount := 0;
if (AnimationInterval = 0) or (AnimationTime <= AnimationInterval) then exit;
FProjectedSteps := Round(AnimationTime / AnimationInterval);
FStartTime := GetTickCount64;
FTimer.Interval := AnimationInterval;
FTimer.Enabled := true;
end;
procedure TCustomAnimatedChartSource.Stop(ACallEvent: Boolean);
begin
FTimer.Enabled := false;
FCurrentStep := 0;
if ACallEvent and Assigned(OnStop) then
OnStop(Self);
end;
initialization
if ZeroValue = 0 then; // Workaround for an incorrect "unused unit" hint.
end.
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