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创建不规则形状的Control

 2006-02-04 13:43:34 来源:WEB开发网   
核心提示: 最近接了一个单子,开发一个产品的教学软件(汗,创建不规则形状的Control,程序员开始变成美工了,没办法要混饭吃,所以改变L就可以改变整个图片的亮度,改变以后再转换回RGB色彩空间,只好堕落了),按照领导(老婆)的说法
   最近接了一个单子,开发一个产品的教学软件(汗,程序员开始变成美工了,没办法要混饭吃,只好堕落了)。按照领导(老婆)的说法,工期紧、任务重,所以,只能拿起我最擅长的Delphi作为开发利器,Delphi好是好,最困难的在于界面设计,这样的软件,脸面最重要,但是,Delphi的弱点(别砸我,我话还没有说完)也在于此,灰不拉鸡的界面在现在几乎等同于Dos的黑底白字一样不受欢迎(郁闷,这不是很好吗!整天装嫩,什么都要Q,连软件都不放过,发廊妹妹说自己昨天18岁生日,你也要装!)。言归正传,看来只能用TImage混合photoshop、CoreDraw做出来的图片了。做出来一看,还行,就是不会动,要动?很简单,弄个透明的Bebvl当作按钮不就可以啦!不行啊!都是方的怎么行,人家的机器上的按钮都是很复杂的形状,都是方的怎么半呢?有办法,我不说,我不说干吗写这篇文章?开玩笑。其实很简单,如果不是TwinControl继承下来的,而是从TControl继承下来的可以做到对于鼠标动作在任意形状区域的响应,TwinControl当然也可以,我比较懒啦!TwinControl怎么作,MSDN上肯定有,无非就是把窗口和一个区域联系起来(关键API连接,SetWindowRgn),当然也可以是响应消息,不过那样窗口不能透明了。Tcontrol实现起来更加简单,关键在一个消息,CM_HITTEST,这是Delphi自定义的消息,别去MSDN查,肯定查不到。这个消息表示测试x,Y是不是落在Control的范围里面,如果你响应这个消息,那么你就可以告诉VCL鼠标是不是落在你的Control范围里面,这样你就可以在矩形之中定义你的Control的任意形状,只要你在响应这个消息的时候“告诉”VCL。这个消息的格式:

  TWMNCHitTest = packed record
   Msg: Cardinal;
   Unused: Longint;
   case Integer of
    0: (
     XPos: Smallint;
     YPos: Smallint);
    1: (
     Pos: TSmallPoint;
     Result: Longint);
  end;

  TCMHitTest = TWMNCHitTest;
这个消息其实就是一个Windows消息的翻版。Result表示返回值,HTCLIENT就是在,HTNOWHERE就是不在。还有其他很多的返回值,有兴趣你可以根据情况多返回一些(没事找事:))。

下面就是这个组件的源代码,这个组件只能接受Bitmap,根据0,0的像素决定透明色彩,同时决定区域,Transparent属性表明是否透明,影响鼠标动作区域,不透明就是整个矩形。当鼠标移动进入的时候,图像颜色会变成高亮,高亮的算法是RGB色彩空间转换到HSL色彩空间,HSL色彩空间,H表示色度,S表示饱和度,L表示亮度,所以改变L就可以改变整个图片的亮度,改变以后再转换回RGB色彩空间。祝各位愉快。

unit HotTrackImage;

interface

uses
  SysUtils, Classes, Controls, Windows, Messages, Graphics, Math, Forms;

const
  MaxPixelCount = 65536;

type
  PRGBTripleArray = ^TRGBTripleArray;
  TRGBTripleArray = array[0..MaxPixelCount - 1] of TRGBTriple;
 
  THotTrackEvent = procedure(Sender:TObject) of object;

  THotTrackImage = class(TGraphicControl)
  private
   { Private declarations }
   {FSearching:Boolean;
   FSearching1:Boolean;
   FSearching2:Boolean;
   FSearching3:Boolean;
   FSearching4:Boolean;
   FSearching5:Boolean;
   FSearching6:Boolean;}
   FPicture: TBitmap;
   FHotPicture: TBitmap;
   FOnProgress: TProgressEvent;
   FStretch: Boolean;
   FCenter: Boolean;
   FIncrementalDisplay: Boolean;
   FDrawing: Boolean;
   FProportional: Boolean;
   FOnHotTrackLeave: THotTrackEvent;
   FOnHotTrackEnter: THotTrackEvent;
   FIsHoted: Boolean;
   FLightAdd: Integer;
   FTransparent: Boolean;
   function GetCanvas: TCanvas;
   procedure SetHoted(Hoted:Boolean);
   procedure DoLightBitmap;
   procedure PictureChanged(Sender: TObject);
   procedure SetCenter(Value: Boolean);
   procedure SetPicture(Value: TBitmap);
   procedure SetStretch(Value: Boolean);
   procedure SetProportional(Value: Boolean);
   procedure SetLightAdd(const Value: Integer);
   procedure CMMouseEnter(var Message: TMessage); message CM_MOUSEENTER;
   procedure CMMouseLeave(var Message: TMessage); message CM_MOUSELEAVE;
   //procedure CMHintShow(var Message: TMessage); message CM_HINTSHOW;
   procedure CMHitTest(var Message: TCMHitTest); message CM_HITTEST;
   procedure SetTransparent(const Value: Boolean);
  protected
   { Protected declarations }
   function CanAutoSize(var NewWidth, NewHeight: Integer): Boolean; override;
   function DestRect: TRect;
   function DoPaletteChange: Boolean;
   function GetPalette: HPALETTE; override;
   procedure Paint; override;
   procedure Progress(Sender: TObject; Stage: TProgressStage;
    PercentDone: Byte; RedrawNow: Boolean; const R: TRect; const Msg: string); dynamic;
   //procedure MouseDown(Button: TMouseButton; Shift: TShiftState;
   //  X, Y: Integer); override;
   //procedure MouseUp(Button: TMouseButton; Shift: TShiftState;
   //  X, Y: Integer); override;
   //procedure MouseMove(Shift: TShiftState; X, Y: Integer); override;
   procedure DoHotTrackEnter;
   procedure DoHotTrackLeave;
   //procedure Click; override;
   //procedure DblClick; override;
  public
   { Public declarations }
   constructor Create(AOwner: TComponent); override;
   destructor Destroy; override;
   property Canvas: TCanvas read GetCanvas;
  published
   { Published declarations }
   property Align;
   property Anchors;
   property AutoSize;
   property Center: Boolean read FCenter write SetCenter default False;
   property Constraints;
   property DragCursor;
   property DragKind;
   property DragMode;
   property Enabled;
   property IncrementalDisplay: Boolean read FIncrementalDisplay write FIncrementalDisplay default False;
   property ParentShowHint;
   property Picture: TBitmap read FPicture write SetPicture;
   property PopupMenu;
   property Proportional: Boolean read FProportional write SetProportional default false;
   property ShowHint;
   property Stretch: Boolean read FStretch write SetStretch default False;
   property Visible;
   property IsHoted:Boolean read FIsHoted;
   property LightAdd:Integer read FLightAdd write SetLightAdd;
   property Transparent: Boolean read FTransparent write SetTransparent default True;
   property OnClick;
   property OnContextPopup;
   property OnDblClick;
   property OnDragDrop;
   property OnDragOver;
   property OnEndDock;
   property OnEndDrag;
   property OnMouseDown;
   property OnMouseMove;
   property OnMouseUp;
   property OnProgress: TProgressEvent read FOnProgress write FOnProgress;
   property OnStartDock;
   property OnStartDrag;
   property OnHotTrackEnter:THotTrackEvent read FOnHotTrackEnter write FOnHotTrackEnter;
   property OnHotTrackLeave:THotTrackEvent read FOnHotTrackLeave write FOnHotTrackLeave;
  end;

procedure Register;

implementation

procedure HSLtoRGB(H, S, L: Double; var R, G, B: Integer);
//hsl颜色空间到rgb空间的转换
var //类似于返回多个值的函数
  Sat, Lum: Double;
begin
  R := 0;
  G := 0;
  B := 0;
  if (H < 360) and (H >= 0) and (S <= 100) and (S >= 0) and (L <= 100) and (L
    >=
    0) then
    begin
     if H <= 60 then
       begin
        R := 255;
        G := Round((255 / 60) * H);
        B := 0;
       end
     else if H <= 120 then
       begin
        R := Round(255 - (255 / 60) * (H - 60));
        G := 255;
        B := 0;
       end
     else if H <= 180 then
       begin
        R := 0;
        G := 255;
        B := Round((255 / 60) * (H - 120));
       end
     else if H <= 240 then
       begin
        R := 0;
        G := Round(255 - (255 / 60) * (H - 180));
        B := 255;
       end
     else if H <= 300 then
       begin
        R := Round((255 / 60) * (H - 240));
        G := 0;
        B := 255;
       end
     else if H < 360 then
       begin
        R := 255;
        G := 0;
        B := Round(255 - (255 / 60) * (H - 300));
       end;

   Sat := Abs((S - 100) / 100);
     R := Round(R - ((R - 128) * Sat));
     G := Round(G - ((G - 128) * Sat));
     B := Round(B - ((B - 128) * Sat));

   Lum := (L - 50) / 50;
     if Lum > 0 then
       begin
        R := Round(R + ((255 - R) * Lum));
        G := Round(G + ((255 - G) * Lum));
        B := Round(B + ((255 - B) * Lum));
       end
     else if Lum < 0 then
       begin
        R := Round(R + (R * Lum));
        G := Round(G + (G * Lum));
        B := Round(B + (B * Lum));
       end;
    end;
end;

procedure RGBtoHSL(R, G, B: Integer; var H, S, L: Double);
// RGB空间到HSL空间的转换
var
  Delta: Double;
  CMax, CMin: Double;
  Red, Green, Blue, Hue, Sat, Lum: Double;
begin
  Red := R / 255;
  Green := G / 255;
  Blue := B / 255;
  CMax := Max(Red, Max(Green, Blue));
  CMin := Min(Red, Min(Green, Blue));
  Lum := (CMax + CMin) / 2;
  if CMax = CMin then
    begin
     Sat := 0;
     Hue := 0;
    end
  else
    begin
     if Lum < 0.5 then
       Sat := (CMax - CMin) / (CMax + CMin)
     else
       Sat := (cmax - cmin) / (2 - cmax - cmin);
     delta := CMax - CMin;
     if Red = CMax then
       Hue := (Green - Blue) / Delta
     else if Green = CMax then
       Hue := 2 + (Blue - Red) / Delta
     else
       Hue := 4.0 + (Red - Green) / Delta;
     Hue := Hue / 6;
     if Hue < 0 then
       Hue := Hue + 1;
    end;
  H := (Hue * 360);
  S := (Sat * 100);
  L := (Lum * 100);
end;

procedure Register;
begin
  RegisterComponents('Custom', [THotTrackImage]);
end;

{ THotTrackImage }

function THotTrackImage.CanAutoSize(var NewWidth,
  NewHeight: Integer): Boolean;
begin
  Result := True;
  if not (csDesigning in ComponentState) or (FPicture.Width > 0) and
   (FPicture.Height > 0) then
  begin
   if Align in [alNone, alLeft, alRight] then
    NewWidth := FPicture.Width;
   if Align in [alNone, alTop, alBottom] then
    NewHeight := FPicture.Height;
  end;
end;

{procedure THotTrackImage.Click;

  procedure ReSearch;
  var
   I:Integer;
   TempHK:TControl;
  begin
   for I:=0 to Parent.ControlCount-1 do
   begin
    TempHK:=Parent.Controls[I];
    if TempHK is THotTrackImage then
    begin
     if not THotTrackImage(TempHK).FSearching3 then
     begin
      THotTrackImage(TempHK).Click();
      Exit;
     end;
    end;
   end;
  end;

begin
  if not FSearching3 then
  begin
   FSearching3:=True;
   try
    if FIsHoted then
    begin
     inherited;
    end else
    begin
     ReSearch;
    end;
   finally
    FSearching3:=False;
   end;
  end;
end;}

{procedure THotTrackImage.CMHintShow(var Message: TMessage);

  procedure ReSearch;
  var
   I:Integer;
   TempHK:TControl;
  begin
   for I:=0 to Parent.ControlCount-1 do
   begin
    TempHK:=Parent.Controls[I];
    if TempHK is THotTrackImage then
    begin
     if not THotTrackImage(TempHK).FSearching5 then
     begin
      if THotTrackImage(TempHK).ShowHint then
      begin
       TCMHintShow(Message).HintInfo^.HintStr:=THotTrackImage(TempHK).Hint;
       THotTrackImage(TempHK).CMHintShow(Message);
       Exit;
      end;
     end;
    end;
   end;
  end;

begin
  if not FSearching5 then
  begin
   FSearching5:=True;
   try
    if FIsHoted then
    begin
     inherited;
    end else
    begin
     ReSearch;
    end;
   finally
    FSearching5:=False;
   end;
  end;
end;}

procedure THotTrackImage.CMMouseEnter(var Message: TMessage);
begin
  inherited;
  SetHoted(True);
end;

procedure THotTrackImage.CMMouseLeave(var Message: TMessage);
begin
  inherited;
  SetHoted(False);
end;

constructor THotTrackImage.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  ControlStyle := ControlStyle + [csReplicatable];
  FPicture := TBitmap.Create;
  FHotPicture := TBitmap.Create;
  FPicture.Transparent:=False;
  FPicture.TransparentMode:=tmAuto;
  FHotPicture.Transparent:=False;
  FHotPicture.TransparentMode:=tmAuto;
  FPicture.OnChange := PictureChanged;
  FPicture.OnProgress := Progress;
  Height := 105;
  Width := 105;
  FIsHoted:=False;
  FLightAdd:=8;
  FTransparent:=True;
  {FSearching:=False;
  FSearching1:=False;
  FSearching2:=False;
  FSearching3:=False;
  FSearching4:=False;
  FSearching5:=False;
  FSearching6:=False;}
end;

{procedure THotTrackImage.DblClick;

  procedure ReSearch;
  var
   I:Integer;
   TempHK:TControl;
  begin
   for I:=0 to Parent.ControlCount-1 do
   begin
    TempHK:=Parent.Controls[I];
    if TempHK is THotTrackImage then
    begin
     if not THotTrackImage(TempHK).FSearching4 then
     begin
      THotTrackImage(TempHK).DblClick();
      Exit;
     end;
    end;
   end;
  end;

begin
  if not FSearching4 then
  begin
   FSearching4:=True;
   try
    if FIsHoted then
    begin
     inherited;
    end else
    begin
     ReSearch;
    end;
   finally
    FSearching4:=False;
   end;
  end;
end;}

function THotTrackImage.DestRect: TRect;
var
  w, h, cw, ch: Integer;
  xyaspect: Double;
begin
  w := Picture.Width;
  h := Picture.Height;
  cw := ClientWidth;
  ch := ClientHeight;
  if Stretch or (Proportional and ((w > cw) or (h > ch))) then
  begin
 if Proportional and (w > 0) and (h > 0) then
 begin
    xyaspect := w / h;
    if w > h then
    begin
     w := cw;
     h := Trunc(cw / xyaspect);
     if h > ch then  // woops, too big
     begin
      h := ch;
      w := Trunc(ch * xyaspect);
     end;
    end
    else
    begin
     h := ch;
     w := Trunc(ch * xyaspect);
     if w > cw then  // woops, too big
     begin
      w := cw;
      h := Trunc(cw / xyaspect);
     end;
    end;
   end
   else
   begin
    w := cw;
    h := ch;
   end;
  end;

  with Result do
  begin
   Left := 0;
   Top := 0;
   Right := w;
   Bottom := h;
  end;

  if Center then
 OffsetRect(Result, (cw - w) div 2, (ch - h) div 2);
end;

destructor THotTrackImage.Destroy;
begin
  FPicture.Free;
  FHotPicture.Free;
  inherited Destroy;
end;

procedure THotTrackImage.DoHotTrackEnter;
begin
  if Assigned(FOnHotTrackEnter) then
   FOnHotTrackEnter(Self);
end;

procedure THotTrackImage.DoHotTrackLeave;
begin
  if Assigned(FOnHotTrackLeave) then
   FOnHotTrackEnter(Self);
end;

procedure THotTrackImage.DoLightBitmap;
var
  x, y, ScanlineBytes: integer;
  p: prgbtriplearray;
  RVALUE, bvalue, gvalue: integer;
  hVALUE, sVALUE, lVALUE: Double;
begin
  FHotPicture.Assign(FPicture);
  if not FHotPicture.Empty then
  begin
   FHotPicture.PixelFormat:=pf24bit;
   p := FHotPicture.ScanLine[0];
   ScanlineBytes := integer(FHotPicture.ScanLine[1]) - integer(FHotPicture.ScanLine[0]);
   for y := 0 to FHotPicture.Height - 1 do
   begin
    for x := 0 to FHotPicture.Width - 1 do
    begin
     RVALUE := p[x].rgbtRed;
     gVALUE := p[x].rgbtGreen;
     bVALUE := p[x].rgbtBlue;
     RGBtoHSL(RVALUE, gVALUE, bVALUE, hVALUE, sVALUE, lVALUE);
     lVALUE := min(100, lVALUE + FLightAdd);
     HSLtorgb(hVALUE, sVALUE, lVALUE, rVALUE, gVALUE, bVALUE);
     p[x].rgbtRed := RVALUE;
     p[x].rgbtGreen := gVALUE;
     p[x].rgbtBlue := bVALUE;
    end;
    inc(integer(p), ScanlineBytes);
   end;
  end;
end;

function THotTrackImage.DoPaletteChange: Boolean;
var
  ParentForm: TCustomForm;
  Tmp: TGraphic;
begin
  Result := False;
  Tmp := FPicture;
  if Visible and (not (csLoading in ComponentState)) and (Tmp <> nil) and
 (Tmp.PaletteModified) then
  begin
 if (Tmp.Palette = 0) then
  Tmp.PaletteModified := False
 else
 begin
  ParentForm := GetParentForm(Self);
  if Assigned(ParentForm) and ParentForm.Active and Parentform.HandleAllocated then
  begin
 if FDrawing then
   ParentForm.Perform(wm_QueryNewPalette, 0, 0)
 else
   PostMessage(ParentForm.Handle, wm_QueryNewPalette, 0, 0);
 Result := True;
 Tmp.PaletteModified := False;
  end;
 end;
  end;
end;

function THotTrackImage.GetCanvas: TCanvas;
begin
 Result := FPicture.Canvas;
end;

function THotTrackImage.GetPalette: HPALETTE;
begin
 Result := FPicture.Palette;
end;

{procedure THotTrackImage.MouseDown(Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);

  procedure ReSearch;
  var
   P:TPoint;
   I:Integer;
   TempHK:TControl;
  begin
   for I:=0 to Parent.ControlCount-1 do
   begin
    TempHK:=Parent.Controls[I];
    if TempHK is THotTrackImage then
    begin
     if not THotTrackImage(TempHK).FSearching1 then
     begin
      P.X:=X;
      P.Y:=Y;
      P:=THotTrackImage(TempHK).ScreenToClient(ClientToScreen(P));
      THotTrackImage(TempHK).MouseDown(Button,Shift,P.X,P.Y);
      Exit;
     end;
    end;
   end;
  end;

begin
  if not FSearching1 then
  begin
   FSearching1:=True;
   try
    if (X>=0)and(X<FPicture.Width)and(Y>=0)and(Y<FPicture.Height) then
    begin
     if FPicture.Canvas.Pixels[X,Y]=FPicture.Canvas.Pixels[0,0] then
     begin
      ReSearch;
     end else
     begin
      inherited;
     end;
    end else
    begin
     ReSearch;
    end;
   finally
    FSearching1:=False;
   end;
  end;
end;}

{procedure THotTrackImage.MouseMove(Shift: TShiftState; X, Y: Integer);

  procedure ReSearch;
  var
   P:TPoint;
   I:Integer;
   TempHK:TControl;
  begin
   for I:=0 to Parent.ControlCount-1 do
   begin
    TempHK:=Parent.Controls[I];
    if TempHK is THotTrackImage then
    begin
     if not THotTrackImage(TempHK).FSearching then
     begin
      P.X:=X;
      P.Y:=Y;
      P:=THotTrackImage(TempHK).ScreenToClient(ClientToScreen(P));
      THotTrackImage(TempHK).MouseMove(Shift,P.X,P.Y);
      Exit;
     end;
    end;
   end;
  end;

  procedure Slicen;
  var
   I:Integer;
   TempHK:TControl;
  begin
   for I:=0 to Parent.ControlCount-1 do
   begin
    TempHK:=Parent.Controls[I];
    if TempHK<>Self then
    begin
     THotTrackImage(TempHK).SetHoted(False);
    end;
   end;
  end;

begin
  if not FSearching then
  begin
   FSearching:=True;
   try
    if (X>=0)and(X<FPicture.Width)and(Y>=0)and(Y<FPicture.Height) then
    begin
     if FPicture.Canvas.Pixels[X,Y]=FPicture.Canvas.Pixels[0,0] then
     begin
      SetHoted(False);
      ReSearch;
     end else
     begin
      SetHoted(True);
      Slicen;
      inherited;
     end;
    end else
    begin
     SetHoted(False);
     ReSearch;
    end;
   finally
    FSearching:=False;
   end;
  end;
end;}

{procedure THotTrackImage.MouseUp(Button: TMouseButton; Shift: TShiftState;
  X, Y: Integer);

  procedure ReSearch;
  var
   P:TPoint;
   I:Integer;
   TempHK:TControl;
  begin
   for I:=0 to Parent.ControlCount-1 do
   begin
    TempHK:=Parent.Controls[I];
    if TempHK is THotTrackImage then
    begin
     if not THotTrackImage(TempHK).FSearching2 then
     begin
      P.X:=X;
      P.Y:=Y;
      P:=THotTrackImage(TempHK).ScreenToClient(ClientToScreen(P));
      THotTrackImage(TempHK).MouseUp(Button,Shift,P.X,P.Y);
      Exit;
     end;
    end;
   end;
  end;

begin
  if not FSearching2 then
  begin
   FSearching2:=True;
   try
    if (X>=0)and(X<FPicture.Width)and(Y>=0)and(Y<FPicture.Height) then
    begin
     if FPicture.Canvas.Pixels[X,Y]=FPicture.Canvas.Pixels[0,0] then
     begin
      ReSearch;
     end else
     begin
      inherited;
     end;
    end else
    begin
     ReSearch;
    end;
   finally
    FSearching2:=False;
   end;
  end;
end;}

procedure THotTrackImage.Paint;
var
  Save: Boolean;
begin
  if csDesigning in ComponentState then
 with inherited Canvas do
 begin
  Pen.Style := psDash;
  Brush.Style := bsClear;
  Rectangle(0, 0, Width, Height);
 end;
  Save := FDrawing;
  FDrawing := True;
  try
   with inherited Canvas do
   begin
    if FIsHoted and not(csDesigning in ComponentState) then
    StretchDraw(DestRect, FHotPicture)
    else
    StretchDraw(DestRect, FPicture);
   end;
  finally
  FDrawing := Save;
  end;
end;

procedure THotTrackImage.PictureChanged(Sender: TObject);
begin
  Picture.Transparent:=FTransparent;
  if AutoSize and (FPicture.Width > 0) and (FPicture.Height > 0) then
 SetBounds(Left, Top, FPicture.Width, FPicture.Height);
  if FTransparent then
   ControlStyle := ControlStyle - [csOpaque]
  else
   ControlStyle := ControlStyle + [csOpaque];
  DoLightBitmap;
  if DoPaletteChange and FDrawing then Update;
  if not FDrawing then Invalidate;
end;

procedure THotTrackImage.Progress(Sender: TObject; Stage: TProgressStage;
  PercentDone: Byte; RedrawNow: Boolean; const R: TRect;
  const Msg: string);
begin
  if FIncrementalDisplay and RedrawNow then
  begin
 if DoPaletteChange then Update
 else Paint;
  end;
  if Assigned(FOnProgress) then FOnProgress(Sender, Stage, PercentDone, RedrawNow, R, Msg);
end;

procedure THotTrackImage.SetCenter(Value: Boolean);
begin
  if FCenter <> Value then
  begin
 FCenter := Value;
 PictureChanged(Self);
  end;
end;

procedure THotTrackImage.CMHitTest(var Message: TCMHitTest);
var
  X,Y:Integer;
begin
  if (Message.XPos>=0)and(Message.XPos<FPicture.Width)and(Message.YPos>=0)and(Message.YPos<FPicture.Height)then
  begin
   if FTransparent then
   begin
    X:=Round(Message.XPos*Picture.Height/Height);
    Y:=Round(Message.YPos*Picture.Height/Height);
    if(FPicture.Canvas.Pixels[X,Y]<>FPicture.Canvas.Pixels[0,0]) then
     Message.Result := HTCLIENT
    else
     Message.Result := HTNOWHERE
   end else
    Message.Result := HTCLIENT;
  end else
   Message.Result := HTNOWHERE;
end;

procedure THotTrackImage.SetHoted(Hoted: Boolean);
begin
  if FIsHoted<>Hoted then
  begin
   FIsHoted:=Hoted;
   Invalidate;
   if Hoted then
   begin
    //SetCaptureControl(Self);
    DoHotTrackEnter;
   end else
   begin
    //SetCaptureControl(nil);
    DoHotTrackLeave;
   end;
  end;
end;

procedure THotTrackImage.SetLightAdd(const Value: Integer);
begin
  FLightAdd := Value;
  DoLightBitmap;
  if FIsHoted then
   Invalidate;
end;

procedure THotTrackImage.SetPicture(Value: TBitmap);
begin
  if Value<>nil then
  begin
   Value.Transparent:=FTransparent;
   Value.TransparentMode:=tmAuto;
  end;
  FPicture.Assign(Value);
end;

procedure THotTrackImage.SetProportional(Value: Boolean);
begin
  if FProportional <> Value then
  begin
 FProportional := Value;
 PictureChanged(Self);
  end;
end;

procedure THotTrackImage.SetStretch(Value: Boolean);
begin
  if Value <> FStretch then
  begin
 FStretch := Value;
 PictureChanged(Self);
  end;
end;

procedure THotTrackImage.SetTransparent(const Value: Boolean);
begin
  if FTransparent<>Value then
  begin
   FTransparent := Value;
   PictureChanged(Self);
  end;
end;

end.

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