Question

这是我的目标。使用鼠标左键滚动图像，鼠标右键移动到选择缩放矩形并双击以恢复完整缩放。

我目前已经厌倦了，到目前为止发现它与我加载图像或显示图像的方式无关，而是与绘制方式有关。无论表格或源图像的形状如何，屏幕上的图像总是填充控件的客户区域，因此不能保留纵横比。我不知道如何改变它或保持纵横比。因此，给我一个干净漂亮的图片。

我发布了我的ZImage单元的整个代码虽然我认为问题出现在Zimage.paint或Zimage.mouseup中但是想想如果你需要在其中一个中看到一个函数，那将有助于将它全部发布。

unit ZImage;

interface

uses
  Windows, Messages, SysUtils,jpeg, Classes, Graphics, Controls, Forms, Dialogs,
  ExtCtrls;

type
  TZImage = class(TGraphicControl)
  private
    FBitmap        : Tbitmap;
    PicRect        : TRect;
    ShowRect       : TRect;
    FShowBorder    : boolean;
    FBorderWidth   : integer;
    FForceRepaint  : boolean;
    FMouse         : (mNone, mDrag, mZoom);
    FProportional  : boolean;
    FDblClkEnable  : boolean;
    FLeft        :integer;
    FRight        :integer;
    FTop             :integer;
    FBottom             :integer;
    startx, starty,
    oldx, oldy     : integer;
    procedure SetShowBorder(s:boolean);
    procedure SetBitmap(b:TBitmap);
    procedure SetBorderWidth(w:integer);
    procedure SetProportional(b:boolean);
  protected
    procedure Paint; override;
    procedure MouseDown(Button: TMouseButton; Shift: TShiftState;
                        X, Y: Integer); override;
    procedure MouseMove(Shift: TShiftState; X, Y: Integer); override;
    procedure MouseUp(Button: TMouseButton; Shift: TShiftState;
              X, Y: Integer); override;
  public
    constructor Create(AOwner:TComponent); override;
    destructor Destroy; override;
    procedure DblClick; override;
  published
  procedure zoom(Endleft,EndRight,EndTop,EndBottom:integer);
    property ValueLeft    : integer read FLeft write FLeft;
    property ValueRight    : Integer read FRight write FRight;
    Property ValueTop         : Integer read FTop write FTop;
    Property ValueBottom         : Integer read FBottom write FBottom;
    property ShowBorder : boolean
                 read FShowBorder
                 write SetShowBorder default true;
    property KeepAspect : boolean
                 read FProportional
                 write SetProportional default true;
    property Bitmap : TBitmap
                 read FBitmap
                 write Setbitmap;
    property BorderWidth : integer
                 read FBorderWidth
                 write SetBorderWidth default 7;
    property ForceRepaint : boolean
                 read FForceRepaint
                 write FForceRepaint default true;
    property DblClkEnable : boolean
                 read FDblClkEnable
                 write FDblClkEnable default False;
    property Align;
    property Width;
    property Height;
    property Top;
    property Left;
    property Visible;
    property Hint;
    property ShowHint;
  end;

procedure Register;

implementation

 //This is the basic create options.
constructor TZImage.Create(AOwner:TComponent);
begin
   inherited;
   FShowBorder:=True;
   FBorderWidth:=7;
   FMouse:=mNone;
   FForceRepaint:=true;    //was true
   FDblClkEnable:=False;
   FProportional:=true;   //was true
   Width:=100; Height:=100;
   FBitmap:=Tbitmap.Create;
   FBitmap.Width:=width;
   FBitmap.height:=Height;
   ControlStyle:=ControlStyle+[csOpaque];
   autosize:= false;
   //Scaled:=false;
end;


//basic destroy frees the FBitmap
destructor TZImage.Destroy;
begin
   FBitmap.Free;
   inherited;
end;

//This was a custom zoom i was using to give the automated zoom effect
procedure TZimage.zoom(Endleft,EndRight,EndTop,EndBottom:integer);
begin

   while ((Endbottom <> picrect.bottom) or (Endtop <> picrect.top)) or ((endleft <> picrect.left) or (endright <> picrect.right)) do
     begin
       if picrect.left > endleft then
            picrect.left := picrect.left -1;
       if picrect.left < endleft  then  //starting
            picrect.left := picrect.left +1;

       if picrect.right > endright then   //starting
            picrect.right := picrect.right -1;
       if picrect.right < endright  then
            picrect.right := picrect.right +1;

       if picrect.top > endtop then
            picrect.top := picrect.top -1;
       if picrect.top < endtop then //starting
            picrect.top := picrect.top +1;

       if picrect.bottom > endbottom then  //starting
            picrect.bottom := picrect.bottom -1;
       if picrect.bottom < endbottom  then
           picrect.bottom := picrect.bottom +1;
       self.refresh;
     end;

end;

//this is the custom paint I know if i put
//Canvas.Draw(0,0,FBitmap);  as the methond it displays
//perfect but the zoom option is gone of course and
//i need the Zoom.
procedure TZImage.Paint;
var buf:TBitmap;
    coef,asps,aspp:Double;
    sz,a : integer;
begin

   buf:=TBitmap.Create;
   buf.Width:=Width;
   buf.Height:=Height;
   if not FShowBorder
     then ShowRect:=ClientRect
     else ShowRect:=Rect(ClientRect.Left,ClientRect.Top,
                         ClientRect.Right-FBorderWidth,
                         ClientRect.Bottom-FBorderWidth);
   ShowRect:=ClientRect;
   with PicRect do begin
    if Right=0 then Right:=FBitmap.Width;
    if Bottom=0 then Bottom:=FBitmap.Height;
   end;
   buf.Canvas.CopyMode:=cmSrcCopy;
   buf.Canvas.CopyRect(ShowRect,FBitmap.Canvas,PicRect);
   Canvas.CopyMode:=cmSrcCopy;
   Canvas.Draw(0,0,buf);
   buf.Free;
end;

procedure TZImage.MouseDown(Button: TMouseButton; Shift: TShiftState;
                            X, Y: Integer);
begin

//   if mbLeft<>Button then Exit;
   if not PtInRect(ShowRect,Point(X,Y)) and
      not PtInRect(Rect(ShowRect.Right,ShowRect.Bottom,
                        Width,Height),Point(X,Y)) then Exit;
   if PtInRect(Rect(ShowRect.Right,ShowRect.Bottom,
                    Width,Height),Point(X,Y)) then begin
      DblClick;
      Exit;
   end;
   //here click is in the picture area only
   startx:=x; oldx:=x;
   starty:=y; oldy:=y;
   if mbRight=Button then begin
      MouseCapture:=True;
      FMouse:=mZoom;
      Canvas.Pen.Mode:=pmNot;
   end else begin
      FMouse:=mDrag;
      Screen.Cursor:=crHandPoint;
   end;
end;



function Min(a,b:integer):integer;
begin
   if a<b then Result:=a else Result:=b;
end;
function Max(a,b:integer):integer;
begin
   if a<b then Result:=b else Result:=a;
end;



procedure TZImage.MouseMove(Shift: TShiftState; X, Y: Integer);
var d,s:integer;
    coef:Double;
begin
    if FMouse=mNone then Exit;
    if FMouse=mZoom then begin
       Canvas.DrawFocusRect(Rect(Min(startx,oldx),Min(starty,oldy),Max(startx,oldx),Max(starty,oldy)));
       oldx:=x; oldy:=y;
       Canvas.DrawFocusRect(Rect(Min(startx,oldx),Min(starty,oldy),Max(startx,oldx),Max(starty,oldy)));
    end;
    if FMouse=mDrag then begin
//horizontal movement
       coef:=(PicRect.Right-PicRect.Left)/(ShowRect.Right-ShowRect.Left);
       d:=Round(coef*(x-oldx));
       s:=PicRect.Right-PicRect.Left;
       if d>0 then begin
          if PicRect.Left>=d then begin
            PicRect.Left:=PicRect.Left-d;
            PicRect.Right:=PicRect.Right-d;
          end else begin
            PicRect.Left:=0;
            PicRect.Right:=PicRect.Left+s;
          end;
       end;
       if d<0 then begin
          if PicRect.Right<FBitmap.Width+d then begin
            PicRect.Left:=PicRect.Left-d;
            PicRect.Right:=PicRect.Right-d;
          end else begin
            PicRect.Right:=FBitmap.Width;
            PicRect.Left:=PicRect.Right-s;
          end;
       end;

//vertical movement
       coef:=(PicRect.Bottom-PicRect.Top)/(ShowRect.Bottom-ShowRect.Top);
       d:=Round(coef*(y-oldy));
       s:=PicRect.Bottom-PicRect.Top;
       if d>0 then begin
          if PicRect.Top>=d then begin
            PicRect.Top:=PicRect.Top-d;
            PicRect.Bottom:=PicRect.Bottom-d;
          end else begin
            PicRect.Top:=0;
            PicRect.Bottom:=PicRect.Top+s;
          end;
       end;

{There was a bug in the fragment below. Thanks to all, who reported this bug to me}
      if d<0 then begin
          if PicRect.Bottom<FBitmap.Height+d then begin
            PicRect.Top:=PicRect.Top-d;
            PicRect.Bottom:=PicRect.Bottom-d;
          end else begin
            PicRect.Bottom:=FBitmap.Height;
            PicRect.Top:=PicRect.Bottom-s;
          end;
       end;


       oldx:=x; oldy:=y;
       if FForceRepaint then Repaint
                        else Invalidate;
    end;
end;



procedure TZImage.MouseUp(Button: TMouseButton; Shift: TShiftState;
                          X, Y: Integer);
var coef:Double;
    t:integer;
    left,right,top,bottom : integer;
begin

   if FMouse=mNone then Exit;
   if x>ShowRect.Right then x:=ShowRect.Right;
   if y>ShowRect.Bottom then y:=ShowRect.Bottom;
   if FMouse=mZoom then begin  //calculate new PicRect
     t:=startx;
     startx:=Min(startx,x);
     x:=Max(t,x);
     t:=starty;
     starty:=Min(starty,y);
     y:=Max(t,y);
     FMouse:=mNone;
     MouseCapture:=False;
//enable the following if you want to zoom-out by dragging in the opposite direction}
{     if Startx>x then begin
        DblClick;
        Exit;
     end;}
     if Abs(x-startx)<5 then Exit;
     //showmessage('picrect Left='+inttostr(picrect.Left)+' right='+inttostr(picrect.Right)+' top='+inttostr(picrect.Top)+' bottom='+inttostr(picrect.Bottom));
     //startx and start y is teh starting x/y of the selected area
     //x and y is the ending x/y of the selected area
     if (x - startx < y - starty) then
     begin
       while (x - startx < y - starty) do
       begin
          x := x + 100;
          startx := startx - 100;
       end;
     end

     else if (x - startx > y - starty) then
     begin
        while (x - startx > y - starty) do
        begin
            y := y + 100;
            starty := starty - 100;
        end;
     end;

//picrect is the size of whole area
//PicRect.top and left are 0,0
//IFs were added in v.1.2 to avoid zero-divide
     if (PicRect.Right=PicRect.Left)
     then
        coef := 100000
     else
        coef:=ShowRect.Right/(PicRect.Right-PicRect.Left);    //if new screen coef= 1
     left:=Round(PicRect.Left+startx/coef);
     Right:=Left+Round((x-startx)/coef);

     if (PicRect.Bottom=PicRect.Top)
     then
        coef := 100000
     else
        coef:=ShowRect.Bottom/(PicRect.Bottom-PicRect.Top);
     Top:=Round(PicRect.Top+starty/coef);
     Bottom:=Top+Round((y-starty)/coef);
     //showmessage(inttostr(left)+' '+inttostr(Right)+' '+inttostr(top)+' '+inttostr(bottom));

     zoom(left,right,top,bottom);
     ValueLeft := left;
     ValueRight := Right;
     ValueTop := top;
     ValueBottom := bottom;
     end;
   if FMouse=mDrag then begin
     FMouse:=mNone;
     Canvas.Pen.Mode:=pmCopy;
     Screen.Cursor:=crDefault;
   end;

   Invalidate;
end;

procedure TZImage.DblClick;
begin
   zoom(0,FBitMap.Width,0,FBitMap.Height);
   ValueLeft := 0;
   ValueRight := FBitMap.Width;
   ValueTop := 0;
   ValueBottom := FBitMap.Height;
   //PicRect:=Rect(0,0,FBitmap.Width,FBitmap.Height);
   Invalidate;
end;

procedure TZImage.SetBitmap(b:TBitmap);
begin
   FBitmap.Assign(b);
   PicRect:=Rect(0,0,b.Width, b.Height);
   Invalidate;
end;

procedure TZImage.SetBorderWidth(w:integer);
begin
   FBorderWidth:=w;
   Invalidate;
end;

procedure TZImage.SetShowBorder(s:boolean);
begin
   FShowBorder:=s;
   Invalidate;
end;

procedure TZImage.SetProportional(b:boolean);
begin
   FProportional:=b;
   Invalidate;
end;

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

end.

使用此代码，您可以注册组件ZImage并查看其运行方式..如果需要

Answer 1

问题很清楚，但我认为回答问题的方法是如何不重写完整的代码，以便您理解。因为我更善于编码然后解释，我做了。

我认为您正在搜索以下内容：

unit ZImage2;

interface

uses
  Windows, Messages, Classes, Controls, Graphics, StdCtrls, ExtCtrls, Math;

const
  DefAnimDuration = 500;

type
  TZImage = class(TGraphicControl)
  private
    FAlignment: TAlignment;
    FAnimDuration: Cardinal;
    FAnimRect: TRect;
    FAnimStartTick: Cardinal;
    FAnimTimer: TTimer;
    FBuffer: TBitmap;
    FCropRect: TRect;
    FImgRect: TRect;
    FLayout: TTextLayout;
    FPicture: TPicture;
    FPrevCropRect: TRect;
    FProportional: Boolean;
    FProportionalCrop: Boolean;
    FScale: Single;
    FSelColor: TColor;
    FSelecting: Boolean;
    FSelPoint: TPoint;
    FSelRect: TRect;
    procedure Animate(Sender: TObject);
    function HasGraphic: Boolean;
    procedure PictureChanged(Sender: TObject);
    procedure RealignImage;
    procedure SetAlignment(Value: TAlignment);
    procedure SetLayout(Value: TTextLayout);
    procedure SetPicture(Value: TPicture);
    procedure SetProportional(Value: Boolean);
    procedure UpdateBuffer;
  protected
    function CanAutoSize(var NewWidth, NewHeight: Integer): Boolean; override;
    procedure ChangeScale(M: Integer; D: Integer); override;
    procedure DblClick; override;
    procedure MouseDown(Button: TMouseButton; Shift: TShiftState; X,
      Y: Integer); override;
    procedure MouseMove(Shift: TShiftState; X, Y: Integer); override;
    procedure MouseUp(Button: TMouseButton; Shift: TShiftState; X,
      Y: Integer); override;
    procedure Paint; override;
    procedure Resize; override;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    procedure Reset;
    function ScreenToGraphic(R: TRect): TRect;
    procedure Zoom(const ACropRect: TRect);
    procedure ZoomSelection(const ASelRect: TRect);
  published
    property Alignment: TAlignment read FAlignment write SetAlignment
      default taLeftJustify;
    property AnimDuration: Cardinal read FAnimDuration write FAnimDuration
      default DefAnimDuration;
    property Layout: TTextLayout read FLayout write SetLayout default tlTop;
    property Picture: TPicture read FPicture write SetPicture;
    property Proportional: Boolean read FProportional write SetProportional
      default False;
    property ProportionalCrop: Boolean read FProportionalCrop
      write FProportionalCrop default True;
    property SelColor: TColor read FSelColor write FSelColor default clWhite;
  published
    property Align;
    property Anchors;
    property AutoSize;
    property Color;
  end;

implementation

function FitRect(const Boundary: TRect; Width, Height: Integer;
  CanGrow: Boolean; HorzAlign: TAlignment; VertAlign: TTextLayout): TRect;
var
  W: Integer;
  H: Integer;
  Scale: Single;
  Offset: TPoint;
begin
  Width := Max(1, Width);
  Height := Max(1, Height);
  W := Boundary.Right - Boundary.Left;
  H := Boundary.Bottom - Boundary.Top;
  if CanGrow then
    Scale := Min(W / Width, H / Height)
  else
    Scale := Min(1, Min(W / Width, H / Height));
  Result := Rect(0, 0, Round(Width * Scale), Round(Height * Scale));
  case HorzAlign of
    taLeftJustify:
      Offset.X := 0;
    taCenter:
      Offset.X := (W - Result.Right) div 2;
    taRightJustify:
      Offset.X := W - Result.Right;
  end;
  case VertAlign of
    tlTop:
      Offset.Y := 0;
    tlCenter:
      Offset.Y := (H - Result.Bottom) div 2;
    tlBottom:
      Offset.Y := H - Result.Bottom;
  end;
  OffsetRect(Result, Boundary.Left + Offset.X, Boundary.Top + Offset.Y);
end;

function NormalizeRect(const Point1, Point2: TPoint): TRect;
begin
  Result.Left := Min(Point1.X, Point2.X);
  Result.Top := Min(Point1.Y, Point2.Y);
  Result.Right := Max(Point1.X, Point2.X);
  Result.Bottom := Max(Point1.Y, Point2.Y);
end;

{ TZImage }

procedure TZImage.Animate(Sender: TObject);
var
  Done: Single;
begin
  Done := (GetTickCount - FAnimStartTick) / FAnimDuration;
  if Done >= 1.0 then
  begin
    FAnimTimer.Enabled := False;
    FAnimRect := FCropRect;
  end
  else
    with FPrevCropRect do
      FAnimRect := Rect(
        Left + Round(Done * (FCropRect.Left - Left)),
        Top + Round(Done * (FCropRect.Top - Top)),
        Right + Round(Done * (FCropRect.Right - Right)),
        Bottom + Round(Done * (FCropRect.Bottom - Bottom)));
  UpdateBuffer;
  RealignImage;
  Invalidate;
end;

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

procedure TZImage.ChangeScale(M, D: Integer);
var
  SaveAnchors: TAnchors;
begin
  SaveAnchors := Anchors;
  Anchors := [akLeft, akTop];
  FScale := FScale * M / D;
  inherited ChangeScale(M, D);
  Anchors := SaveAnchors;
end;

constructor TZImage.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  ControlStyle := [csCaptureMouse, csClickEvents, csOpaque, csDoubleClicks];
  FAnimTimer := TTimer.Create(Self);
  FAnimTimer.Interval := 15;
  FAnimTimer.OnTimer := Animate;
  FAnimDuration := DefAnimDuration;
  FBuffer := TBitmap.Create;
  FPicture := TPicture.Create;
  FPicture.OnChange := PictureChanged;
  FProportionalCrop := True;
  FScale := 1.0;
  FSelColor := clWhite;
end;

procedure TZImage.DblClick;
begin
  if not HasGraphic then
    Reset
  else
    Zoom(Rect(0, 0, FPicture.Width, FPicture.Height));
  inherited DblClick;
end;

destructor TZImage.Destroy;
begin
  FPicture.Free;
  FBuffer.Free;
  inherited Destroy;
end;

function TZImage.HasGraphic: Boolean;
begin
  Result := (Picture.Width > 0) and (Picture.Height > 0);
end;

procedure TZImage.MouseDown(Button: TMouseButton; Shift: TShiftState; X,
  Y: Integer);
begin
  if (Button = mbRight) and HasGraphic and PtInRect(FImgRect, Point(X, Y)) then
  begin
    FSelPoint.X := X;
    FSelPoint.Y := Y;
    FSelRect := Rect(X, Y, X, Y);
    FSelecting := True;
    Canvas.Brush.Color := FSelColor;
    Canvas.DrawFocusRect(FSelRect);
  end;
  inherited MouseDown(Button, Shift, X, Y);
end;

procedure TZImage.MouseMove(Shift: TShiftState; X, Y: Integer);
const
  HorzAlign: array[Boolean] of TAlignment = (taLeftJustify, taRightJustify);
  VertAlign: array[Boolean] of TTextLayout = (tlTop, tlBottom);
begin
  if FSelecting and PtInRect(FImgRect, Point(X, Y)) then
  begin
    Canvas.DrawFocusRect(FSelRect);
    FSelRect := NormalizeRect(FSelPoint, Point(X, Y));
    if (not FProportionalCrop) then
      FSelRect := FitRect(FSelRect, FPicture.Graphic.Width,
        FPicture.Graphic.Height, True, HorzAlign[X < FSelPoint.X],
        VertAlign[Y < FSelPoint.Y]);
    Canvas.DrawFocusRect(FSelRect);
  end;
  inherited MouseMove(Shift, X, Y);
end;

procedure TZImage.MouseUp(Button: TMouseButton; Shift: TShiftState; X,
  Y: Integer);
begin
  if FSelecting then
  begin
    FSelecting := False;
    Canvas.DrawFocusRect(FSelRect);
    if (Abs(X - FSelPoint.X) > Mouse.DragThreshold) or
        (Abs(Y - FSelPoint.Y) > Mouse.DragThreshold) then
      ZoomSelection(FSelRect);
  end;
  inherited MouseUp(Button, Shift, X, Y);
end;

procedure TZImage.Paint;
begin
  Canvas.Brush.Color := Color;
  if HasGraphic then
  begin
    Canvas.StretchDraw(FImgRect, FBuffer);
    if FSelecting then
      Canvas.DrawFocusRect(FSelRect);
    with FImgRect do
      ExcludeClipRect(Canvas.Handle, Left, Top, Right, Bottom);
  end;
  Canvas.FillRect(Canvas.ClipRect);
end;

procedure TZImage.PictureChanged(Sender: TObject);
begin
  Reset;
end;

procedure TZImage.RealignImage;
begin
  if not HasGraphic then
    FImgRect := Rect(0, 0, 0, 0)
  else if FProportional then
    FImgRect := ClientRect
  else
    FImgRect := FitRect(ClientRect, FBuffer.Width, FBuffer.Height, True,
      FAlignment, FLayout);
end;

procedure TZImage.Reset;
begin
  FCropRect := Rect(0, 0, FPicture.Width, FPicture.Height);
  FAnimRect := FCropRect;
  UpdateBuffer;
  RealignImage;
  Invalidate;
end;

procedure TZImage.Resize;
begin
  RealignImage;
  inherited Resize;
end;

function TZImage.ScreenToGraphic(R: TRect): TRect;
var
  CropWidth: Integer;
  CropHeight: Integer;
  ImgWidth: Integer;
  ImgHeight: Integer;
begin
  CropWidth := FCropRect.Right - FCropRect.Left;
  CropHeight := FCropRect.Bottom - FCropRect.Top;
  ImgWidth := FImgRect.Right - FImgRect.Left;
  ImgHeight := FImgRect.Bottom - FImgRect.Top;
  IntersectRect(R, R, FImgRect);
  OffsetRect(R, -FImgRect.Left, -FImgRect.Top);
  Result := Rect(
    FCropRect.Left + Round(CropWidth * (R.Left / ImgWidth)),
    FCropRect.Top + Round(CropHeight * (R.Top / ImgHeight)),
    FCropRect.Left + Round(CropWidth * (R.Right / ImgWidth)),
    FCropRect.Top + Round(CropHeight * (R.Bottom / ImgHeight)));
end;

procedure TZImage.SetAlignment(Value: TAlignment);
begin
  if FAlignment <> Value then
  begin
    FAlignment := Value;
    RealignImage;
    Invalidate;
  end;
end;

procedure TZImage.SetLayout(Value: TTextLayout);
begin
  if FLayout <> Value then
  begin
    FLayout := Value;
    RealignImage;
    Invalidate;
  end;
end;

procedure TZImage.SetPicture(Value: TPicture);
begin
  FPicture.Assign(Value);
end;

procedure TZImage.SetProportional(Value: Boolean);
begin
  if FProportional <> Value then
  begin
    FProportional := Value;
    RealignImage;
    Invalidate;
  end;
end;

procedure TZImage.UpdateBuffer;
begin
  if HasGraphic then
  begin
    FBuffer.Width := FAnimRect.Right - FAnimRect.Left;
    FBuffer.Height := FAnimRect.Bottom - FAnimRect.Top;
    FBuffer.Canvas.Draw(-FAnimRect.Left, -FAnimRect.Top, FPicture.Graphic);
  end;
end;

procedure TZImage.Zoom(const ACropRect: TRect);
begin
  if HasGraphic then
  begin
    FPrevCropRect := FAnimRect;
    FCropRect := ACropRect;
    if FAnimDuration = 0 then
    begin
      FAnimRect := FCropRect;
      UpdateBuffer;
      RealignImage;
      Invalidate;
    end
    else
    begin
      FAnimStartTick := GetTickCount;
      FAnimTimer.Enabled := True;
    end;
  end;
end;

procedure TZImage.ZoomSelection(const ASelRect: TRect);
begin
  Zoom(ScreenToGraphic(ASelRect));
end;

end.

示例代码：

procedure TForm1.FormCreate(Sender: TObject);
begin
  FImage := TZImage.Create(Self);
  FImage.SetBounds(10, 10, 200, 300);
  FImage.Picture.LoadFromFile('D:\Pictures\Mona_Lisa.jpg');
  FImage.Alignment := taCenter;
  FImage.Layout := tlCenter;
  FImage.AutoSize := True;
  FImage.Parent := Self;
end;

Sample image

如何缩放以正确保持纵横比

1 个答案: