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

本例效果图:

代码文件:

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;
　　 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.