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program spritedemo;
{$mode objfpc}{$H+}
uses
{$IFDEF UNIX}{$IFDEF UseCThreads}
cthreads,
{$ENDIF}{$ENDIF}
Classes, SysUtils,
fpg_base, fpg_main, fpg_form, fpg_imgfmt_bmp;
type
TMainForm = class(TfpgForm)
private
Timer: TfpgTimer;
Background: TfpgImage;
SpriteImg: TfpgImage;
FShowInterval: Boolean;
procedure TimerFired(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure FormClose(Sender: TObject; var CloseAction: TCloseAction);
procedure FormPaint(Sender: TObject);
protected
procedure HandleKeyPress(var keycode: word; var shiftstate: TShiftState;
var consumed: boolean); override;
public
constructor Create(AOwner: TComponent); override;
procedure AfterCreate; override;
end;
procedure TMainForm.FormDestroy(Sender: TObject);
begin
Timer.Free;
SpriteImg.Free;
Background.Free;
end;
procedure TMainForm.TimerFired(Sender: TObject);
begin
if csDestroying in ComponentState then
Exit;
Repaint;
end;
procedure TMainForm.FormClose(Sender: TObject; var CloseAction: TCloseAction);
begin
Timer.Enabled := False;
end;
procedure TMainForm.FormPaint(Sender: TObject);
var
t: Double;
x: Int64;
y: Integer;
CenterX: Integer;
CenterY: Integer;
begin
// paint background
Canvas.DrawImage(0, 0, Background);
// calculate sprite position
CenterX:=Background.Width div 2;
CenterY:=Background.Height div 2;
t := Now*86400;
x := CenterX+round(cos(t)*CenterX*2/3)-(SpriteImg.Width div 2);
y := CenterY+round(sin(t*0.7)*CenterY*2/3)-(SpriteImg.Height div 2);
// paint sprite
Canvas.DrawImage(x, y, SpriteImg);
// paint debug info
if FShowInterval then
begin
Canvas.DrawText(4, 4, 'Timer Interval: ' + IntToStr(Timer.Interval));
end;
end;
procedure TMainForm.HandleKeyPress(var keycode: word;
var shiftstate: TShiftState; var consumed: boolean);
var
interval: integer;
begin
case keycode of
keyPageUp: // increase timer interval
begin
interval := Timer.Interval;
inc(interval, 10);
Timer.Interval := interval;
consumed := True;
end;
keyPageDown: // decrease timer interval
begin
interval := Timer.Interval;
dec(interval, 10);
if interval < 10 then
interval := 10;
Timer.Interval := interval;
consumed := True;
end;
keyEscape: // exit application
begin
Close;
end;
end;
if KeycodeToText(keycode, shiftstate) = 'D' then // show debug info
begin
FShowInterval := True;
consumed := True;
end;
if not consumed then
inherited HandleKeyPress(keycode, shiftstate, consumed);
end;
constructor TMainForm.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FShowInterval := False;
OnPaint := @FormPaint;
OnClose := @FormClose;
OnDestroy := @FormDestroy;
Background := LoadImage_BMP('splash_logo.bmp');
SpriteImg := LoadImage_BMP('ide_icon48x48.bmp');
SpriteImg.CreateMaskFromSample(0, 0);
SpriteImg.UpdateImage;
Timer := TfpgTimer.Create(50);
Timer.OnTimer := @TimerFired;
Timer.Enabled := True;
end;
procedure TMainForm.AfterCreate;
begin
Name := 'MainForm';
SetPosition(316, 186, 429, 341);
WindowTitle := 'Sprite Demo';
WindowPosition := wpScreenCenter;
end;
procedure MainProc;
var
frm: TMainForm;
begin
fpgApplication.Initialize;
frm := TMainForm.Create(nil);
try
frm.Show;
fpgApplication.Run;
finally
frm.Free;
end;
end;
begin
MainProc;
end.
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