bmp drehen

[arukas]

hi,

ich hab noch mal eine Frage.

Delphi-Quellcode:

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    image: TImage;
    procedure Button1Click(Sender: TObject);   
FUNCTION Rotate(CONST BitmapOriginal: TBitmap;
  CONST iRotationAxis, jRotationAxis: INTEGER;
  CONST AngleOfRotation: DOUBLE  {radians} ): TBitmap;
  private
    { Private declarations }
  public
    { Public declarations }
  end;


CONST
MaxPixelCount = 32768;

TYPE
  TRGBTripleArray = ARRAY[0..MaxPixelCount-1] OF TRGBTriple;
  pRGBTripleArray = ^TRGBTripleArray;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
rotate(image,12,34,56);

end;


// "Simple" approach. For pixel (i,j), use "reverse" rotation to find
// where the rotated pixel must have been before the rotation.
// Don't bother with center of pixel adjustment.
// Assumes input BitmapOriginal has PixelFormat = pf24bit.
FUNCTION Rotate(CONST BitmapOriginal: TBitmap;
  CONST iRotationAxis, jRotationAxis: INTEGER;
  CONST AngleOfRotation: DOUBLE  {radians} ): TBitmap;

  VAR
    cosTheta   : EXTENDED;
    i          : INTEGER;
    iOriginal  : INTEGER;
    iPrime     : INTEGER;
    j          : INTEGER;
    jOriginal  : INTEGER;
    jPrime     : INTEGER;
    RowOriginal: pRGBTripleArray;
    RowRotated : pRGBTRipleArray;
    sinTheta   : EXTENDED;
BEGIN
  // The size of BitmapRotated is the same as BitmapOriginal. PixelFormat
  // must also match since 24-bit GBR triplets are assumed in ScanLine.
  RESULT := TBitmap.Create;
  RESULT.Width  := BitmapOriginal.Width;
  RESULT.Height := BitmapOriginal.Height;
  RESULT.PixelFormat := pf24bit; // Force this

  // Get SIN and COS in single call from math library
  sinTheta := SIN(AngleOfRotation);

  // If no math library, then use this:
  // sinTheta := SIN(AngleOfRotation);
  // cosTheta := COS(AngleOfRotation);

  // Step through each row of rotated image.
  FOR j := RESULT.Height-1 DOWNTO 0 DO
  BEGIN
    RowRotated := RESULT.Scanline[j];
    jPrime := j - jRotationAxis;

    FOR i := RESULT.Width-1 DOWNTO 0 DO
    BEGIN
      iPrime := i - iRotationAxis;
      iOriginal := iRotationAxis + ROUND(iPrime * CosTheta - jPrime * sinTheta);
      jOriginal := jRotationAxis + ROUND(iPrime * sinTheta + jPrime * cosTheta);

      // Make sure (iOriginal, jOriginal) is in BitmapOriginal. If not,
      // assign blue color to corner points.
      IF (iOriginal >= 0) AND (iOriginal <= BitmapOriginal.Width-1) AND
          (jOriginal >= 0) AND (jOriginal <= BitmapOriginal.Height-1)
      THEN BEGIN
        // Assign pixel from rotated space to current pixel in BitmapRotated
        RowOriginal := BitmapOriginal.Scanline[jOriginal];
        RowRotated[i] := RowOriginal[iOriginal]
      END
      ELSE BEGIN
        RowRotated[i].rgbtBlue := 255; // assign "corner" color
        RowRotated[i].rgbtGreen := 0;
        RowRotated[i].rgbtRed := 0
     END

    END
  END
END {RotateBitmapMethod1};



end.

Bei dem Code bekomme ich folgende Fehlermeldung:

Delphi-Quellcode:

[Error] Unit1.pas(40): Incompatible types: 'TBitmap' and 'TImage'
[Error] Unit1.pas(14): Unsatisfied forward or external declaration: 'TForm1.Rotate'
[Fatal Error] Project1.dpr(5): Could not compile used unit 'Unit1.pas'

Ich dachte eigentlich, dass ich hier...

Delphi-Quellcode:

rotate(image,12,34,56);
.
.
FUNCTION Rotate(CONST BitmapOriginal: TBitmap;
CONST iRotationAxis, jRotationAxis: INTEGER;
CONST AngleOfRotation: DOUBLE  {radians} ): TBitmap;

...nur sagen muss, welches Bild ich wie drehen möchte, aber irgendwie scheint das nicht ganz so gut zu funktionieren, wie ich mir das vorgestellt hab.

pls help


Euer Arukas