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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[17]: FillRectangle、ColorRefToARGB、TGPSolidBrush

再學GDI+[17]: FillRectangle、ColorRefToARGB、TGPSolidBrush

編輯:Delphi

本例效果圖:

代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, ComCtrls, StdCtrls, ExtCtrls;
type
 TForm1 = class(TForm)
  ColorListBox1: TColorListBox;
  TrackBar1: TTrackBar;
  procedure FormCreate(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure ColorListBox1Click(Sender: TObject);
  procedure TrackBar1Change(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ,GDIPAPI;
procedure TForm1.FormCreate(Sender: TObject);
begin
 Self.Position := poDesktopCenter;
 ColorListBox1.Align := alRight;
 TrackBar1.ShowSelRange := False;
 TrackBar1.PageSize := 20;
 TrackBar1.Min := 0;
 TrackBar1.Max := 255;
 TrackBar1.Position := TrackBar1.Max;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 r: TGPRect;
 sb: TGPSolidBrush;
 clr: TGPColor;
 Alpha: Byte;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 g.Clear(MakeColor(255,255,255));
 r := MakeRect(20, 20, 200, 150);
 clr := ColorRefToARGB(ColorListBox1.Selected);
 Alpha := TrackBar1.Position;
 clr := MakeColor(Alpha, GetRed(clr), GetGreen(clr), GetBlue(clr));
 sb := TGPSolidBrush.Create(clr);
 g.FillRectangle(sb, r);
 sb.Free;
 g.Free;
end;
procedure TForm1.ColorListBox1Click(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.TrackBar1Change(Sender: TObject);
begin
 Repaint;
 Text := Format('透明度: %d', [TrackBar1.Position]);
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
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
 object ColorListBox1: TColorListBox
  Left = 248
  Top = 0
  Width = 91
  Height = 206
  Align = alRight
  ItemHeight = 16
  TabOrder = 0
  OnClick = ColorListBox1Click
 end
 object TrackBar1: TTrackBar
  Left = 0
  Top = 184
  Width = 249
  Height = 45
  TabOrder = 1
  OnChange = TrackBar1Change
 end
end

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