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{
fpGUI - Free Pascal GUI Toolkit
Copyright (C) 2006 - 2008 See the file AUTHORS.txt, included in this
distribution, for details of the copyright.
See the file COPYING.modifiedLGPL, included in this distribution,
for details about redistributing fpGUI.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Description:
It's a simple little component that animates an image that contains
multiple frames (in a horizontal direction). See the Animation
demo for image examples.
}
unit fpg_animation;
{$mode objfpc}{$H+}
interface
uses
Classes,
fpg_base,
fpg_main,
fpg_widget;
type
TfpgBaseImgAnim = class(TfpgWidget)
private
FFrameCount: integer;
FImageFilename: TfpgString;
FImage: TfpgImage;
FInterval: integer;
FTimer: TfpgTimer;
FPos: integer;
FImageWidth: TfpgCoord;
FTransparent: Boolean;
procedure InternalTimerFired(Sender: TObject);
procedure SetAnimPosition(const AValue: integer);
procedure SetInterval(const AValue: integer);
procedure RecalcImageWidth;
protected
procedure HandlePaint; override;
procedure SetEnabled(const AValue: boolean); override;
procedure SetImageFilename(const AValue: TfpgString); virtual;
//
property Interval: integer read FInterval write SetInterval default 50;
property ImageFileName: TfpgString read FImageFilename write SetImageFilename;
property IsTransparent: Boolean read FTransparent write FTransparent default True;
property FrameCount: integer read FFrameCount write FFrameCount default 4;
property Position: integer read FPos write SetAnimPosition default 0;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
end;
TfpgImgAnim = class(TfpgBaseImgAnim)
public
property Position;
published
property Enabled;
property Interval;
property ImageFileName;
property IsTransparent;
property FrameCount;
end;
implementation
uses
SysUtils,
fpg_imgfmt_bmp,
fpg_utils;
{ TfpgBaseImgAnim }
procedure TfpgBaseImgAnim.InternalTimerFired(Sender: TObject);
begin
Repaint;
inc(FPos);
if FPos > FrameCount-1 then
FPos := 0;
end;
procedure TfpgBaseImgAnim.SetAnimPosition(const AValue: integer);
begin
if FTimer.Enabled then
Exit; // ignore position because animation is running
if AValue < 0 then
FPos := 0
else
FPos := AValue;
Repaint;
end;
procedure TfpgBaseImgAnim.SetInterval(const AValue: integer);
begin
if FInterval = AValue then
Exit; //==>
FInterval := AValue;
FTimer.Interval := FInterval;
RecalcImageWidth;
end;
procedure TfpgBaseImgAnim.RecalcImageWidth;
begin
FImageWidth := FImage.Width div FrameCount;
FPos := 0;
end;
procedure TfpgBaseImgAnim.HandlePaint;
begin
if (FImageFilename = '') or (FImage = nil) then
Exit; //==>
Canvas.BeginDraw;
Canvas.Clear(clWindowBackground);
Canvas.DrawImagePart(0, 0, FImage, (FImageWidth * FPos), 0, FImageWidth, FImage.Height);
Canvas.EndDraw;
end;
procedure TfpgBaseImgAnim.SetEnabled(const AValue: boolean);
begin
inherited SetEnabled(AValue);
FTimer.Enabled := FEnabled;
end;
procedure TfpgBaseImgAnim.SetImageFilename(const AValue: TfpgString);
begin
if FImageFilename = AValue then
Exit; //==>
if Trim(AValue) = '' then
Exit; //==>
if not fpgFileExists(AValue) then
raise Exception.CreateFmt('The file <%s> does not exist.', [AValue])
else
FImageFilename := AValue;
FTimer.Enabled := False;
FImage.Free;
FImage := LoadImage_BMP(FImageFilename);
if FTransparent then
begin
FImage.CreateMaskFromSample(0, 0);
FImage.UpdateImage;
end;
RecalcImageWidth;
Repaint;
end;
constructor TfpgBaseImgAnim.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FPos := 0;
FFrameCount := 4;
FInterval := 50;
FImage := nil;
FEnabled := False;
FTransparent := True;
FTimer := TfpgTimer.Create(FInterval);
FTimer.OnTimer := @InternalTimerFired;
end;
destructor TfpgBaseImgAnim.Destroy;
begin
FTimer.Enabled := False;
FTimer.Free;
FImage.Free;
inherited Destroy;
end;
end.
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