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//demo code that lets the user draw an image and then save it to a png file
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{ Copyright (C) 2005 Bas Steendijk and Peter Green
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For conditions of distribution and use, see copyright notice in zlib_license.txt
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which is included in the package
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----------------------------------------------------------------------------- }
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unit Unit1;
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interface
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uses
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Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
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ExtCtrls, ColorGrd, StdCtrls;
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type
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TForm1 = class(TForm)
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Shape1: TShape;
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ColorGrid1: TColorGrid;
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Image1: TImage;
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Button1: TButton;
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procedure FormCreate(Sender: TObject);
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procedure Shape1MouseDown(Sender: TObject; Button: TMouseButton;
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Shift: TShiftState; X, Y: Integer);
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procedure Button1Click(Sender: TObject);
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private
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{ Private declarations }
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public
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{ Public declarations }
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end;
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var
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Form1: TForm1;
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implementation
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uses
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pngwrite;
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{$R *.DFM}
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type
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tshapesline = array [0..0] of tshape;
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pshapesline = ^tshapesline;
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tshapes = array [0..0] of pshapesline;
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pshapes = ^tshapes;
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var
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shapes : pshapes;
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maxline,maxcol : integer;
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procedure TForm1.FormCreate(Sender: TObject);
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var
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line,col : integer;
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begin
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maxline := 31;
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maxcol := 63;
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image1.Height := maxline+1;
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image1.Width := maxcol+1;
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Image1.Picture.Bitmap.PixelFormat := pf24bit;
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image1.Picture.Bitmap.Height := maxline+1;
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image1.Picture.Bitmap.Width := maxcol+1;
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shapes := allocmem((maxline+1)*sizeof(tshape));
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for line := 0 to maxline do begin
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shapes[line] := allocmem((maxcol+1)*sizeof(pshapesline));
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for col := 0 to maxcol do begin
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if (line=0) and (col=0) then begin
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shapes[0][0] := shape1;
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end else begin
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shapes[line][col] := tshape.create(self);
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shapes[line][col].parent := self;
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shapes[line][col].width := shape1.Width;
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shapes[line][col].height := shape1.Width;
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shapes[line][col].left := shape1.left+(shape1.width-1)*col;
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shapes[line][col].top := shape1.top+(shape1.height-1)*line;
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shapes[line][col].OnMouseDown := shape1.OnMouseDown;
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shapes[line][col].tag := line + (col shl 16);
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end;
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end;
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end;
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end;
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type
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tlinedata = array[0..0] of byte;
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plinedata = ^tlinedata;
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procedure TForm1.Shape1MouseDown(Sender: TObject; Button: TMouseButton;
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Shift: TShiftState; X, Y: Integer);
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var
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line : integer;
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col : integer;
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linedata : plinedata;
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begin
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tshape(sender).Brush.Color := ColorGrid1.ForegroundColor;
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line := tshape(sender).tag and $FFFF;
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col := tshape(sender).tag shr 16;
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linedata := image1.Picture.Bitmap.scanline[line];
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linedata[(col*3)+2] := tshape(sender).brush.color;
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linedata[(col*3)+1] := tshape(sender).brush.color shr 8;
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linedata[(col*3) ] := tshape(sender).brush.color shr 16;
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//showmessage(inttostr(linedata[(col*3) ]));
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image1.invalidate;
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end;
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procedure TForm1.Button1Click(Sender: TObject);
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var
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stream : tfilestream;
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f : tpngwrite;
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counter : integer;
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begin
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stream := tfilestream.Create('test243.png',fmCreate{fmOpenWrite} or fmShareDenyNone );
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try
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pngstart(f,stream,24,ctbgr,image1.picture.Bitmap.Height,image1.Picture.Bitmap.Width);
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pngstartdata(f);
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for counter := 0 to image1.picture.Bitmap.Height-1 do begin
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pngwritescanline(f,image1.picture.Bitmap.scanline[counter]);
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end;
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pngfinishdata(f);
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pngfinish(f);
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finally
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stream.Free;
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end;
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end;
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end.
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