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:TempDX.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
