Delphi 与 DirectX 之 DelphiX(11): TPictureCollectionItem.DrawAdd、DrawSub

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所属分类:[开发技巧]

本例目的学习:TPictureCollectionItem的DrawAdd、DrawSub 函数 达到使图片颜色的变化

本例效果图:

代码:

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, DXDraws, StdCtrls;

type
TForm1 = class(TForm)
DXDraw1: TDXDraw;
Button1: TButton;
Button2: TButton;
DXImageList1: TDXImageList;
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

var
pic1,pic2: TPictureCollectionItem;

procedure TForm1.Button1Click(Sender: TObject);
var
r:TRect;
begin
R := Bounds((DXDraw1.Width - pic2.Width) div 2,
(DXDraw1.Height - pic2.Height),
pic2.Width,
pic2.Height);
DXDraw1.Surface.Fill(0);
pic1.StretchDraw(DXDraw1.Surface,DXDraw1.ClientRect,0);
pic2.Drawadd(DXDraw1.Surface, r, 0);
DXDraw1.Flip;
end;

procedure TForm1.Button2Click(Sender: TObject);
var
R: TRect;
begin
R := Bounds((DXDraw1.Width - pic2.Width) div 2,
(DXDraw1.Height - pic2.Height),
Pic2.Width,
pic2.Height);
DXDraw1.Surface.Fill(0);
pic1.StretchDraw(DXDraw1.Surface, DXDraw1.ClientRect,0);
pic2.DrawSub(DXDraw1.Surface,r,0);
DXDraw1.Flip;
end;

procedure TForm1.FormCreate(Sender: TObject);
const
ImgPath1 = 'C:\Temp\Back.jpg';
ImgPath2 = 'C:\Temp\DelphiX.bmp';
begin
DXImageList1.DXDraw := DXDraw1;
pic1 := TPictureCollectionItem(DXImageList1.Items.Add);
pic1.Picture.loadFromFile(ImgPath1);
pic2 := TPictureCollectionItem(DXImageList1.Items.Add);
pic2.Picture.LoadFromFile(ImgPath2);
end;

end.

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