Delphi與DirectX之DelphiX(87): TDIB.DrawTransparent、DrawTranslucent、DrawAlpha();
TDIB.DrawTransparent: 按指定的透明色透明;
TDIB.DrawTranslucent: 先按指定的透明色透明, 然後再半透明;
DIB.DrawAlpha: 先按指定的透明色透明, 再按指定的透明度透明.
本例效果圖:
代碼文件:
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;
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);
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.DrawTransparent(dib, 0, 0, dib.Width, dib.Height, 0, 0, clBlack);
DXPaintBox1.Repaint;
end;
procedure TForm1.Button3Click(Sender: TObject);
begin
DXPaintBox1.DIB.Fill(Self.Color);
DXPaintBox1.DIB.DrawTransparent(dib, 0, 0, dib.Width, dib.Height, 0, 0, clRed);
DXPaintBox1.Repaint;
end;
procedure TForm1.Button4Click(Sender: TObject);
begin
DXPaintBox1.DIB.Fill(Self.Color);
DXPaintBox1.DIB.DrawTranslucent(dib, 0, 0, dib.Width, dib.Height, 0, 0, clBlack);
DXPaintBox1.Repaint;
end;
procedure TForm1.Button5Click(Sender: TObject);
begin
DXPaintBox1.DIB.Fill(Self.Color);
DXPaintBox1.DIB.DrawTranslucent(dib, 0, 0, dib.Width, dib.Height, 0, 0, clRed);
DXPaintBox1.Repaint;
end;
procedure TForm1.Button6Click(Sender: TObject);
begin
DXPaintBox1.DIB.Fill(Self.Color);
DXPaintBox1.DIB.DrawAlpha(dib, 0, 0, dib.Width, dib.Height, 0, 0, 32, clBlack);
DXPaintBox1.Repaint;
end;
procedure TForm1.Button7Click(Sender: TObject);
begin
DXPaintBox1.DIB.Fill(Self.Color);
DXPaintBox1.DIB.DrawAlpha(dib, 0, 0, dib.Width, dib.Height, 0, 0, 32, clRed);
DXPaintBox1.Repaint;
end;
end.
窗體文件:
object Form1: TForm1
Left = 0
Top = 0
Caption = 'Form1'
ClientHeight = 185
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 = 87
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 = 154
Width = 58
Height = 25
Caption = 'Button6'
TabOrder = 5
OnClick = Button6Click
end
object Button7: TButton
Left = 145
Top = 154
Width = 55
Height = 25
Caption = 'Button7'
TabOrder = 6
OnClick = Button7Click
end
end
