如何在Delphi中从合成图像创建平移

您可以使用Paintbox进行绘画,1 Backimage,带有信息和透明pngimages的记录数组.

可以在偏移/缩放/旋转中操纵画布.
移动和命中检测会发生在mousedown和mousemove中.

它不完整,但可能会让你知道如何做到这一点.

[delphi]
unit Unit1;

interface

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

type
  TBuilding=Record   // record for building informations
    Pos:TPoint;
    PNGImage:TPngImage;
    // what ever needed
  End;

  TBuildingArray=Array of TBuilding; // array of buildings

  TForm1 = class(TForm)
    PaintBox1: TPaintBox;
    Button1: TButton;
    procedure FormCreate(Sender: TObject);
    procedure PaintBox1Paint(Sender: TObject);
    procedure PaintBox1MouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X,Y: Integer);
    procedure PaintBox1MouseMove(Sender: TObject; Shift: TShiftState; X,Y: Integer);
    procedure Button1Click(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  private
    { Private-Deklarationen }
    FXoffs,FYOffs,FZoom:Double; // offset and zoom for painting
    FMouseDownPoint:TPoint;
    FBackGroundPNG:TPNGImage;
    FBuildingArray:TBuildingArray;
    procedure Check4Hit(X,Y: Integer);
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation
uses Math;
{$R *.dfm}


Procedure SetCanvasZoomAndRotation(ACanvas:TCanvas;Zoom:Double;Angle:Double;CenterpointX,CenterpointY:Double);
var
    form : tagXFORM;
    Winkel:Double;
begin
      Winkel := DegToRad(Angle);
      SetGraphicsMode(ACanvas.Handle,GM_ADVANCED);
      SetMapMode(ACanvas.Handle,MM_ANISOTROPIC);
      form.eM11 := Zoom * cos( Winkel);
      form.eM12 := Zoom *Sin( Winkel)  ;
      form.eM21 := Zoom * (-sin( Winkel));
      form.eM22 := Zoom * cos( Winkel) ;
      form.eDx := CenterpointX;
      form.eDy := CenterpointY;
      SetWorldTransform(ACanvas.Handle,form);
end;

Procedure ResetCanvas(ACanvas:TCanvas);
begin
   SetCanvasZoomAndRotation(ACanvas,1,0);
end;


procedure TForm1.FormCreate(Sender: TObject);
var
 Path:String;
 i:Integer;
begin
   FZoom := 1;
   DoubleBuffered := true;
   Path := ExtractFilePath(Paramstr(0));
   FBackGroundPNG:=TPNGImage.Create;
   FBackGroundPNG.LoadFromFile(Path + 'infect.png');
   SetLength(FBuildingArray,3);
   for I := 0 to High(FBuildingArray)  do
      begin
         FBuildingArray[i].PNGImage := TPngImage.Create;
         FBuildingArray[i].PNGImage.LoadFromFile(Path + Format('B%d.png',[i]));
         FBuildingArray[i].Pos.X := I * 300;
         FBuildingArray[i].Pos.Y := Random(1000);
      end;

end;
procedure TForm1.FormDestroy(Sender: TObject);
var
 i:Integer;
begin
   for I := 0 to High(FBuildingArray)  do
      begin
         FBuildingArray[i].PNGImage.Free;
      end;
   FBackGroundPNG.Free;
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
  if FZoom=0.5 then FZoom := 1 else FZoom := 0.5;
  PaintBox1.Invalidate;
end;

procedure TForm1.Check4Hit(X,Y:Integer);
var
 i,Index:Integer;
 R:TRect;
 P:TPoint;
begin
   index := -1;
   for I := 0 to High(FBuildingArray)  do
      begin
         R := Rect(FBuildingArray[i].Pos.X,FBuildingArray[i].Pos.Y,FBuildingArray[i].Pos.X + FBuildingArray[i].PNGImage.Width,FBuildingArray[i].Pos.Y + FBuildingArray[i].PNGImage.Height);
         P := Point(Round((x - FXOffs)/FZoom),Round((y - FYOffs)/FZoom));
         if PtInRect(R,P) then Index := i;
      end;
   if index > -1 then
      begin
        Caption := Format('Last hit %d',[index]);
      end
   else Caption := 'No Hit';
end;

procedure TForm1.PaintBox1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X,Y: Integer);
begin
   Check4Hit(X,Y);
   FMouseDownPoint.X := X;
   FMouseDownPoint.Y := Y;
end;

procedure TForm1.PaintBox1MouseMove(Sender: TObject; Shift: TShiftState; X,Y: Integer);
begin
   if ssLeft in Shift then
      begin
         FXoffs := -( FMouseDownPoint.X - X) ;
         FYoffs := -( FMouseDownPoint.Y - Y) ;
         if FXoffs>0 then FXoffs := 0;
         if FYoffs>0 then FYoffs := 0;
         PaintBox1.Invalidate;
      end;
end;

procedure TForm1.PaintBox1Paint(Sender: TObject);
var
 i:Integer;
begin
   SetCanvasZoomAndRotation(PaintBox1.Canvas,FZoom,FXoffs,FYOffs);
   PaintBox1.Canvas.Draw(0,FBackGroundPNG);
   for I := 0 to High(FBuildingArray)  do
      begin
         PaintBox1.Canvas.Draw(FBuildingArray[i].Pos.X,FBuildingArray[i].PNGImage);
      end;
end;

end.

[/delphi]