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unit MainUnit1;
{$mode objfpc}{$H+}
interface
{.$DEFINE DEBUG} //Show draw for rotate
uses
Classes, SysUtils, LCLType, LResources, Forms, Controls, Graphics, Dialogs,
Buttons, FPImage, IntfGraphics,Math, StdCtrls;
type
{ TForm1 }
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
Edit1: TEdit;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Form1Create(Sender: TObject);
procedure Form1Destroy(Sender: TObject);
procedure FormPaint(Sender: TObject);
private
FKind: Byte; // 1 = FadeIn 2 = Rotate
procedure FadeIn(ABitmap: TBitmap; x, y: integer);
procedure Rotate(ABitmap: TBitmap; aCanvas : TCanvas; x, y, Angle : integer);
public
SampleBitmapABitmap: TBitmap;
end;
var
Form1: TForm1;
implementation
{$R *.lfm}
{ TForm1 }
procedure TForm1.Button1Click(Sender: TObject);
begin
FKind := 1;
Invalidate;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
FKind := 2;
Invalidate;
end;
procedure TForm1.Form1Create(Sender: TObject);
begin
FKind := 0;
SampleBitmapABitmap:=TBitmap.Create;
SampleBitmapABitmap.LoadFromFile(SetDirSeparators('../../images/LazarusForm.bmp'));
end;
procedure TForm1.Form1Destroy(Sender: TObject);
begin
SampleBitmapABitmap.Free;
end;
procedure TForm1.FormPaint(Sender: TObject);
begin
if FKind = 1 then
FadeIn(SampleBitmapABitmap,120,120)
else
if FKind = 2 then
Rotate(SampleBitmapABitmap,Canvas,120,120,StrToIntDef(Edit1.Text,90));
FKind := 0;
end;
procedure TForm1.FadeIn(ABitmap: TBitmap; x, y: integer);
var
SrcIntfImg, TempIntfImg: TLazIntfImage;
ImgHandle,ImgMaskHandle: HBitmap;
FadeStep: Integer;
px, py: Integer;
CurColor: TFPColor;
TempBitmap: TBitmap;
begin
SrcIntfImg:=TLazIntfImage.Create(0,0);
SrcIntfImg.LoadFromBitmap(ABitmap.Handle,ABitmap.MaskHandle);
TempIntfImg:=TLazIntfImage.Create(0,0);
TempIntfImg.LoadFromBitmap(ABitmap.Handle,ABitmap.MaskHandle);
TempBitmap:=TBitmap.Create;
for FadeStep:=1 to 32 do
begin
for py:=0 to SrcIntfImg.Height-1 do
begin
for px:=0 to SrcIntfImg.Width-1 do
begin
CurColor:=SrcIntfImg.Colors[px,py];
CurColor.Red:=(CurColor.Red*FadeStep) shr 5;
CurColor.Green:=(CurColor.Green*FadeStep) shr 5;
CurColor.Blue:=(CurColor.Blue*FadeStep) shr 5;
TempIntfImg.Colors[px,py]:=CurColor;
end;
end;
TempIntfImg.CreateBitmaps(ImgHandle,ImgMaskHandle,false);
TempBitmap.Handle:=ImgHandle;
TempBitmap.MaskHandle:=ImgMaskHandle;
Canvas.Draw(x,y,TempBitmap);
end;
SrcIntfImg.Free;
TempIntfImg.Free;
TempBitmap.Free;
end;
procedure TForm1.Rotate(ABitmap: TBitmap; aCanvas : TCanvas; x, y, Angle: integer);
var
SrcIntfImg, TempIntfImg: TLazIntfImage;
ImgHandle,ImgMaskHandle: HBitmap;
px, py : Integer;
CurColor : TFPColor;
TempBitmap: TBitmap;
ToX,ToY : Integer;
Xo,Yo : Integer;
beta : Single;
MinX,MaxX : Integer;
MinY,MaxY : Integer;
Dx,Dy : Integer;
procedure RotatePts(Var aX,aY : Integer);
Var Xr,Yr : Integer;
begin
//Change new axe
xr:=aX-Xo;
yr:=aY-Yo;
//Rotation
aX:=Xo+Round(Xr*Cos(Beta)+Yr*Sin(Beta));
aY:=Yo+Round(Xr*Sin(Beta)*-1+Cos(Beta)*Yr);
end;
{$IFDEF DEBUG}
procedure Croix(aX,aY : integer; cl : TColor=clBlack);
begin
aCanvas.pen.Color:=cl;
aCanvas.MoveTo(ax-10,ay);
aCanvas.LineTo(ax+10,ay);
aCanvas.MoveTo(ax,ay-10);
aCanvas.LineTo(ax,ay+10);
end;
{$ENDIF}
begin
SrcIntfImg:=TLazIntfImage.Create(0,0);
SrcIntfImg.LoadFromBitmap(ABitmap.Handle,ABitmap.MaskHandle);
TempIntfImg:=TLazIntfImage.Create(0,0);
//Calculate the Sin and Cos of beta for later.
Beta:=(Angle)*Pi/180;
try
{$IFDEF DEBUG}
aCanvas.Brush.Style:=bsSolid;
aCanvas.Brush.Color:=Color;
aCanvas.FillRect(Rect(0,0,Width,Height-100));
aCanvas.Brush.Color:=clWhite;
{$ENDIF}
TempIntfImg.LoadFromBitmap(ABitmap.Handle,ABitmap.MaskHandle);
TempBitmap:=TBitmap.Create;
Xo:= SrcIntfImg.Width div 2; //Center of rotation for x
Yo:= SrcIntfImg.Height div 2; //Center of rotation for y
px:=xo;
py:=yo;
//Calc new size after rotation
px:=0;
py:=0;
RotatePts(px,py);
toX:=0;
toY:=SrcIntfImg.Height;
RotatePts(ToX,ToY);
MinX:=Min(px+x,Tox+x);
MaxX:=Max(px+x,Tox+x);
MinY:=Min(py+y,Toy+y);
MaxY:=Max(py+y,Toy+y);
px:=SrcIntfImg.Width;
py:=0;
RotatePts(px,py);
toX:=SrcIntfImg.Width;
toY:=SrcIntfImg.Height;
RotatePts(ToX,ToY);
MaxX:=MaxIntValue([px+x,Tox+x,MaxX]);
MaxY:=MaxIntValue([py+y,Toy+y,MaxY]);
MinX:=MinIntValue([px+x,Tox+x,MinX]);
MinY:=MinIntValue([py+y,Toy+y,MinY]);
{$IFDEF DEBUG}
aCanvas.Rectangle(0+x,0+y,SrcIntfImg.Width+x,SrcIntfImg.Height+y);
aCanvas.TextOut(xo+x-20,yo+y-20,Format('(%dx%d)',[MaxX-MinX,MaxY-MinY]));
{$ENDIF}
TempIntfImg.Width :=(MaxX-MinX)+1;
TempIntfImg.Height:=(MaxY-MinY)+1;
TempIntfImg.FillPixels(FPColor(0, 0, 0, 0));
Dx:=(TempIntfImg.Width div 2)-Xo;
Dy:=(TempIntfImg.Height div 2)-Yo;
for py:=0 to SrcIntfImg.Height-1 do
begin
for px:=0 to SrcIntfImg.Width-1 do
begin
CurColor:=SrcIntfImg.Colors[px,py];
ToX:=Px; ToY:=py;
RotatePts(ToX,ToY);
try
TempIntfImg.Colors[ToX+Dx,ToY+Dy]:=CurColor;
except
end;
end;
end;
{$IFDEF DEBUG}
Croix(xo+x,yo+y,clblue);
px:=SrcIntfImg.Width;
py:=SrcIntfImg.Height;
RotatePts(px,py);
croix(px+x,py+y);
px:=SrcIntfImg.Width;
py:=0;
RotatePts(px,py);
croix(px+x,py+y);
px:=0;
py:=SrcIntfImg.Height;
RotatePts(px,py);
croix(px+x,py+y);
px:=0;
py:=0;
RotatePts(px,py);
croix(px+x,py+y);
{$ENDIF}
TempIntfImg.CreateBitmaps(ImgHandle,ImgMaskHandle,false);
TempBitmap.Handle:=ImgHandle;
TempBitmap.MaskHandle:=ImgMaskHandle;
aCanvas.Draw(x-dx,y-dy,TempBitmap);
{$IFDEF DEBUG}
aCanvas.Brush.Style:=bsClear;
aCanvas.Rectangle(x-dx,y-dy,TempBitmap.Width+x-dx,TempBitmap.Height+y-dy);
{$ENDIF}
finally
SrcIntfImg.Free;
TempIntfImg.Free;
TempBitmap.Free;
end;
end;
end.
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