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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> Delphi與DirectX之DelphiX(89): TDIB.DrawAlphaMask();

Delphi與DirectX之DelphiX(89): TDIB.DrawAlphaMask();

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, DIB, StdCtrls, ExtCtrls;
type
  TForm1 = class(TForm)
   DXPaintBox1: TDXPaintBox;
   Button1: TButton;
   Button2: TButton;
   ColorBox1: TColorBox;
   ColorBox2: TColorBox;
   procedure FormCreate(Sender: TObject);
   procedure FormDestroy(Sender: TObject);
   procedure Button1Click(Sender: TObject);
   procedure Button2Click(Sender: TObject);
  end;
var
  Form1: TForm1;
implementation
{$R *.dfm}
const str = '春';
var
  dib,dib1,dib2: TDIB;
procedure TForm1.FormCreate(Sender: TObject);
const
  ImgPath1 = 'C:\Temp\DX.jpg';
begin
  dib := TDIB.Create;
  dib1 := TDIB.Create;
  dib2 := TDIB.Create;
  dib.LoadFromFile(ImgPath1);
  DXPaintBox1.ClientWidth := dib.Width;
  DXPaintBox1.ClientHeight := dib.Height;
  DXPaintBox1.DIB.Assign(dib);
  dib1.Assign(dib);
  dib2.SetSize(dib.Width, dib.Height, 24);
  dib2.Canvas.Brush.Style := bsClear;
  dib2.Canvas.Font.Name := '黑體';
  dib2.Canvas.Font.Size := 90;
  dib2.Canvas.Font.Style := [fsBold];
  ColorBox1.Selected := clBlack;
  ColorBox2.Selected := clYellow;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
  dib.Free;
  dib1.Free;
  dib2.Free;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
  dib1.Assign(dib);
  dib2.Fill(ColorBox1.Selected);
  dib2.Canvas.Font.Color := ColorBox2.Selected;
  dib2.Canvas.TextOut(0, 0, str);
  dib1.DrawAlphaMask(dib2, dib1, 0, 0, dib.Width, dib.Height, 0, 0);
  DXPaintBox1.DIB.Assign(dib1);
  DXPaintBox1.Repaint;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
  dib1.Assign(dib);
  dib2.Fill(ColorBox2.Selected);
  dib2.Canvas.Font.Color := ColorBox1.Selected;
  dib2.Canvas.TextOut(0, 0, str);
  dib1.DrawAlphaMask(dib2, dib1, 0, 0, dib.Width, dib.Height, 0, 0);
  DXPaintBox1.DIB.Assign(dib1);
  DXPaintBox1.Repaint;
end;
end.

窗體文件:

object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 142
  ClientWidth = 226
  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 = 81
   Height = 73
   AutoStretch = False
   Center = False
   KeepAspect = False
   Stretch = False
   ViewWidth = 0
   ViewHeight = 0
  end
  object Button1: TButton
   Left = 143
   Top = 78
   Width = 75
   Height = 25
   Caption = 'Button1'
   TabOrder = 0
   OnClick = Button1Click
  end
  object Button2: TButton
   Left = 143
   Top = 109
   Width = 75
   Height = 25
   Caption = 'Button2'
   TabOrder = 1
   OnClick = Button2Click
  end
  object ColorBox1: TColorBox
   Left = 143
   Top = 8
   Width = 81
   Height = 22
   ItemHeight = 16
   TabOrder = 2
  end
  object ColorBox2: TColorBox
   Left = 143
   Top = 36
   Width = 81
   Height = 22
   ItemHeight = 16
   TabOrder = 3
  end
end

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