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| Unit
Unit1;
Interface
Uses
Windows,
Messages,
SysUtils,
Variants,
Classes,
Graphics,
Controls,
Forms,
Dialogs,
StdCtrls,
ExtCtrls;
Type
TForm1 = Class(TForm)
RadioGroup1: TRadioGroup;
Procedure FormCreate(Sender: TObject);
Procedure FormDestroy(Sender: TObject);
Procedure FormResize(Sender: TObject);
Procedure RadioGroup1Click(Sender: TObject);
Procedure FormPaint(Sender: TObject);
Private { Private declarations }
Background: TBitmap;
Public { Public declarations }
End;
Var
Form1: TForm1;
Implementation
{$R *.dfm}
Function CalcRect(Const DstRect: TRect; Const SrcRect: TRect): TRect;
Var w, h, cw, ch: Integer; xyaspect: Double;
Begin
w:=SrcRect.Right-SrcRect.Left;
h:=SrcRect.Bottom-SrcRect.Top;
cw:=DstRect.Right-DstRect.Left;
ch:=DstRect.Bottom-DstRect.Top;
xyaspect:=w/h;
If w>h Then
Begin
w:=cw;
h:=Trunc(cw/xyaspect);
If h>ch Then
Begin
h:=ch;
w:=Trunc(ch*xyaspect);
end;
End
Else
Begin
h:=ch;
w:=Trunc(ch*xyaspect);
If w>cw Then
Begin
w:=cw;
h:=Trunc(cw/xyaspect);
End;
End;
With Result Do
Begin
Left:=0;
Top:=0;
Right:=w;
Bottom:=h;
End;
OffsetRect(Result, (cw-w) Div 2, (ch-h) Div 2);
End;
Procedure TForm1.FormCreate(Sender: TObject);
Begin
DoubleBuffered:=True;
Background:=TBitmap.Create();
Background.PixelFormat:=pf24bit;
Background.Width:=64;
Background.Height:=64;
Background.Canvas.Ellipse(0, 0, 64, 64);
End;
Procedure TForm1.FormDestroy(Sender: TObject);
Begin
Background.Free();
End;
Procedure TForm1.FormResize(Sender: TObject);
Begin
Repaint();
End;
Procedure TForm1.RadioGroup1Click(Sender: TObject);
Begin
Repaint();
End;
Procedure TForm1.FormPaint(Sender: TObject);
Var Rc: TRect;
Begin
Canvas.Lock();
Case RadioGroup1.ItemIndex Of
0:
Begin
Canvas.Brush.Bitmap:=Background;
Canvas.FillRect(Canvas.ClipRect);
End;
1:
Begin
Canvas.StretchDraw(Canvas.ClipRect, Background);
End;
2:
Begin
Canvas.Brush.Color:=Color;
Canvas.FillRect(Canvas.ClipRect);
Rc:=CalcRect(Canvas.ClipRect, Background.Canvas.ClipRect);
Canvas.StretchDraw(Rc, Background);
End;
Else
Begin
Canvas.Brush.Color:=Color;
Canvas.FillRect(Canvas.ClipRect);
End;
End;
Canvas.Unlock();
End;
End. |
(
Сообщение было отмечено edsjeka как решение
