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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學 GDI+[88]: TGPImage(8) - 放大鏡

再學 GDI+[88]: TGPImage(8) - 放大鏡

編輯:Delphi

 本例效果圖:

再學 GDI+[88]: TGPImage(8) - 放大鏡

  代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls;
type
 TForm1 = class(TForm)
  CheckBox1: TCheckBox;
  procedure FormCreate(Sender: TObject);
  procedure FormDestroy(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
var
 img: TGPImage;
 rt: TGPRectF;
 n: Single = 2.0; {放大的倍數}
procedure TForm1.FormCreate(Sender: TObject);
begin
 img := TGPImage.Create('c:temptest.png');
 ClIEntWidth := img.GetWidth;
 ClIEntHeight := img.GetHeight;
 Position := poDesktopCenter;
 DoubleBuffered := True;
 CheckBox1.Caption := '使用放大鏡';
 CheckBox1.Left := ClIEntWidth - CheckBox1.Width;
 CheckBox1.Top := ClIEntHeight - CheckBox1.Height - 2;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
 img.Free;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 p: TGPPen;
 b: TGPSolidBrush;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 p := TGPPen.Create(MakeColor(128, 255, 255, 255));
 b := TGPSolidBrush.Create(aclBlack);
 {原圖像}
 g.DrawImage(img, 0, 0, img.GetWidth, img.GetHeight);
 if CheckBox1.Checked then
 begin
  {放大鏡的陰影}
  g.FillRectangle(b, MakeRect(rt.X + 2, rt.Y + 2, rt.Width, rt.Height));
  {放大後的局部圖像: 參數2是放大後的范圍; 參數3-6是要被放大的范圍; 參數7是單位}
  g.DrawImage(img, rt, rt.X, rt.Y, rt.Width / n, rt.Height / n, UnitPixel);
  {放大鏡的邊框}
  g.DrawRectangle(p, rt);
 end;
 b.Free;
 p.Free;
 g.Free;
end;
procedure TForm1.FormMouseMove(Sender: TObject; Shift: TShiftState; X,
 Y: Integer);
begin
 if CheckBox1.Checked then
 begin
  rt := MakeRect(X, Y, 150.0, 150);
  Repaint;
 end;
end;
end.
窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClIEntHeight = 206
 ClIEntWidth = 339
 Color = clBtnFace
 Font.Charset = DEFAULT_CHARSET
 Font.Color = clWindowText
 Font.Height = -11
 Font.Name = 'Tahoma'
 Font.Style = []
 OldCreateOrder = False
 OnCreate = FormCreate
 OnDestroy = FormDestroy
 OnMouseMove = FormMouseMove
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
 object CheckBox1: TCheckBox
  Left = 240
  Top = 181
  Width = 97
  Height = 17
  Caption = 'CheckBox1'
  TabOrder = 0
 end
end


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