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TDXImageList.Items 中的每个 TPictureCollectionItem 的默认透明色是黑色, 并默认透明. 本例使用的测试图片: https://files.cnblogs.com/del/Transparent.rar 本例效果图: 代码文件: unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, DXDraws, StdCtrls, DXClass; type TForm1 = class(TForm) DXDraw1: TDXDraw; DXImageList1: TDXImageList; CheckBox1: TCheckBox; procedure FormCreate(Sender: TObject); procedure CheckBox1Click(Sender: TObject); end; var Form1: TForm1; implementation {$R *.dfm} var PicItem: TPictureCollectionItem; procedure TForm1.FormCreate(Sender: TObject); const ImgPath1 = 'C:\Temp\Transparent.bmp'; begin DXImageList1.DXDraw := DXDraw1; PicItem := TPictureCollectionItem(DXImageList1.Items.Add); PicItem.Picture.LoadFromFile(ImgPath1); PicItem.TransparentColor := $FFFFFF; {指定透明色; 我测试用的图片是白色背景的} end; procedure TForm1.CheckBox1Click(Sender: TObject); const arr: array[Boolean] of string = ('不透明', '透明'); begin DXDraw1.Surface.Fill($FF0000); PicItem.Restore; PicItem.Transparent := CheckBox1.Checked; PicItem.Draw(DXDraw1.Surface, 10, 10, 0); DXDraw1.Flip; CheckBox1.Caption := arr[CheckBox1.Checked]; end; end. |
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