DelphiX 圖像處理：TDIB.Rotate 任意角度旋轉

效果預覽

功能說明

TDIB.Rotate(Source: TDIB; CenterX, CenterY: Integer; Angle: Single) 以指定中心點旋轉來源圖像 Angle 度。範例以圖像中心為旋轉心，逆時針旋轉 45 度。同樣採用雙緩衝來源 DIB。

完整程式碼

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, DIB, StdCtrls;

type
  TForm1 = class(TForm)
    DXPaintBox1: TDXPaintBox;
    Button1: TButton;
    Button2: TButton;
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

var
  Dib: TDIB;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Dib := TDIB.Create;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  Dib.Free;
end;

procedure TForm1.Button1Click(Sender: TObject);
const
  ImgPath = 'C:\Temp\DX.jpg';
begin
  Dib.LoadFromFile(ImgPath);
  DXPaintBox1.DIB.Assign(Dib);
  DXPaintBox1.Width := Dib.Width;
  DXPaintBox1.Height := Dib.Height;
  DXPaintBox1.Repaint;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  DXPaintBox1.DIB.Rotate(Dib, Dib.Width div 2, Dib.Height div 2, 45);
  DXPaintBox1.DIB.Assign(Dib);
  DXPaintBox1.Repaint;
end;

end.

表單定義 (DFM 節錄)

object Form1: TForm1
  ClientHeight = 142; ClientWidth = 226
  OnCreate = FormCreate; OnDestroy = FormDestroy
  object DXPaintBox1: TDXPaintBox
    Left = 8; Top = 8; Width = 81; Height = 73
  end
  object Button1: TButton
    Left = 143; Top = 78; Width = 75; Height = 25; Caption = 'Load'
  end
  object Button2: TButton
    Left = 143; Top = 109; Width = 75; Height = 25; Caption = 'Rotate 45'
  end
end