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unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, jpeg, ExtCtrls,Math;
type
TForm1 = class(TForm)
Image1: TImage;
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
procedure bmp_rotate(src,dst:tbitmap{;angle:extended});
var
SWidth,SHeight,SHalfHeight{°ë¸ß}:integer;
PX,PY:integer;
FSHalfHeight:real;
c0,c1:tcolor;
begin
SWidth:=src.Width;
SHeight:=src.Height;
//ÅжÏÐÐÊýÊÇÆæÊý»¹ÊÇżÊý£¬ÊÇÆæÊýµÄ»°µ¥¶À½»»»×óÓÒÏñËØÑÕÉ«£¬ÊÇżÊýÔòÌø¹ý
SHalfHeight:=floor(SHeight/2);
FSHalfHeight:=SHeight/2;
if SHalfHeight<FSHalfHeight then
begin
PY:=SHalfHeight;
for PX :=0 to floor(SWidth/2) do begin
c0:=src.Canvas.Pixels[PX,PY];
c1:=src.Canvas.Pixels[SWidth-1-PX,PY];
if c0=c1 then
else
begin
dst.Canvas.Pixels[SWidth-1-PX,PY]:=c0;
dst.Canvas.Pixels[PX,PY]:=c1;
end
end;
end;
// ¿ªÊ¼Ðýת
for PY :=0 to SHalfHeight-1 do begin
for PX :=0 to SWidth-1 do begin
c0:=src.Canvas.Pixels[PX,PY];
c1:=src.Canvas.Pixels[SWidth-1-


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