Delphi 与 DirectX 之 DelphiX(88): TDIB.DrawQuickAlpha();

本例效果图:

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代码文件:

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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;

    Button3: TButton;

    Button4: TButton;

    Button5: TButton;

    Button6: TButton;

    Button7: TButton;

    Button8: TButton;

    Button9: TButton;

    procedure FormCreate(Sender: TObject);

    procedure FormDestroy(Sender: TObject);

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

    procedure Button3Click(Sender: TObject);

    procedure Button4Click(Sender: TObject);

    procedure Button5Click(Sender: TObject);

    procedure Button6Click(Sender: TObject);

    procedure Button7Click(Sender: TObject);

    procedure Button8Click(Sender: TObject);

    procedure Button9Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



var

  dib: TDIB;



procedure TForm1.FormCreate(Sender: TObject);

begin

  dib := TDIB.Create;

  dib.SetSize(DXPaintBox1.Width, DXPaintBox1.Height, 24);

  dib.Fill(0);

  dib.Canvas.Brush.Style := bsClear;

  dib.Canvas.Font.Color := clRed;

  dib.Canvas.Font.Name := 'Tahoma';

  dib.Canvas.Font.Size := 32;

  dib.Canvas.Font.Style := [fsBold];

  dib.Canvas.TextOut(10, 10, 'DelphiX');

  Self.Color := clWhite;

end;



procedure TForm1.FormDestroy(Sender: TObject);

begin

  dib.Free;

end;



procedure TForm1.Button1Click(Sender: TObject);

begin

  DXPaintBox1.DIB.Assign(dib);

  DXPaintBox1.Repaint;

end;



procedure TForm1.Button2Click(Sender: TObject);

begin

  DXPaintBox1.DIB.Fill(Self.Color);

  DXPaintBox1.DIB.DrawQuickAlpha(dib, 0, 0, dib.Width, dib.Height, 0, 0, clBlack, fmNormal);

  DXPaintBox1.Repaint;

end;



procedure TForm1.Button3Click(Sender: TObject);

begin

  DXPaintBox1.DIB.Fill(Self.Color);

  DXPaintBox1.DIB.DrawQuickAlpha(dib, 0, 0, dib.Width, dib.Height, 0, 0, clBlack, fmMix75);

  DXPaintBox1.Repaint;

end;



procedure TForm1.Button4Click(Sender: TObject);

begin

  DXPaintBox1.DIB.Fill(Self.Color);

  DXPaintBox1.DIB.DrawQuickAlpha(dib, 0, 0, dib.Width, dib.Height, 0, 0, clBlack, fmMix50);

  DXPaintBox1.Repaint;

end;



procedure TForm1.Button5Click(Sender: TObject);

begin

  DXPaintBox1.DIB.Fill(Self.Color);

  DXPaintBox1.DIB.DrawQuickAlpha(dib, 0, 0, dib.Width, dib.Height, 0, 0, clBlack, fmMix25);

  DXPaintBox1.Repaint;

end;



procedure TForm1.Button6Click(Sender: TObject);

begin

  DXPaintBox1.DIB.Fill(Self.Color);

  DXPaintBox1.DIB.DrawQuickAlpha(dib, 0, 0, dib.Width, dib.Height, 0, 0, clRed, fmNormal);

  DXPaintBox1.Repaint;

end;



procedure TForm1.Button7Click(Sender: TObject);

begin

  DXPaintBox1.DIB.Fill(Self.Color);

  DXPaintBox1.DIB.DrawQuickAlpha(dib, 0, 0, dib.Width, dib.Height, 0, 0, clRed, fmMix75);

  DXPaintBox1.Repaint;

end;



procedure TForm1.Button8Click(Sender: TObject);

begin

  DXPaintBox1.DIB.Fill(Self.Color);

  DXPaintBox1.DIB.DrawQuickAlpha(dib, 0, 0, dib.Width, dib.Height, 0, 0, clRed, fmMix50);

  DXPaintBox1.Repaint;

end;



procedure TForm1.Button9Click(Sender: TObject);

begin

  DXPaintBox1.DIB.Fill(Self.Color);

  DXPaintBox1.DIB.DrawQuickAlpha(dib, 0, 0, dib.Width, dib.Height, 0, 0, clRed, fmMix25);

  DXPaintBox1.Repaint;

end;



end.


 
   

窗体文件:

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object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 224

  ClientWidth = 208

  Color = clBtnFace

  Font.Charset = DEFAULT_CHARSET

  Font.Color = clWindowText

  Font.Height = -11

  Font.Name = 'Tahoma'

  Font.Style = []

  OldCreateOrder = False

  OnCreate = FormCreate

  OnDestroy = FormDestroy

  PixelsPerInch = 96

  TextHeight = 13

  object DXPaintBox1: TDXPaintBox

    Left = 8

    Top = 8

    Width = 193

    Height = 73

    AutoStretch = False

    Center = False

    KeepAspect = False

    Stretch = False

    ViewWidth = 0

    ViewHeight = 0

  end

  object Button1: TButton

    Left = 8

    Top = 92

    Width = 67

    Height = 125

    Caption = 'Button1'

    TabOrder = 0

    OnClick = Button1Click

  end

  object Button2: TButton

    Left = 81

    Top = 92

    Width = 58

    Height = 25

    Caption = 'Button2'

    TabOrder = 1

    OnClick = Button2Click

  end

  object Button3: TButton

    Left = 145

    Top = 92

    Width = 57

    Height = 25

    Caption = 'Button3'

    TabOrder = 2

    OnClick = Button3Click

  end

  object Button4: TButton

    Left = 81

    Top = 123

    Width = 58

    Height = 25

    Caption = 'Button4'

    TabOrder = 3

    OnClick = Button4Click

  end

  object Button5: TButton

    Left = 145

    Top = 123

    Width = 57

    Height = 25

    Caption = 'Button5'

    TabOrder = 4

    OnClick = Button5Click

  end

  object Button6: TButton

    Left = 81

    Top = 161

    Width = 58

    Height = 25

    Caption = 'Button6'

    TabOrder = 5

    OnClick = Button6Click

  end

  object Button7: TButton

    Left = 145

    Top = 161

    Width = 57

    Height = 25

    Caption = 'Button7'

    TabOrder = 6

    OnClick = Button7Click

  end

  object Button8: TButton

    Left = 81

    Top = 192

    Width = 58

    Height = 25

    Caption = 'Button8'

    TabOrder = 7

    OnClick = Button8Click

  end

  object Button9: TButton

    Left = 145

    Top = 192

    Width = 57

    Height = 25

    Caption = 'Button9'

    TabOrder = 8

    OnClick = Button9Click

  end

end