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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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//main unit for graph drawing demo
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//draws a sine and cosine graph into a 2 bit per pixel
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//array.
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//Copies it into a truecolor tbitmap (that is visible on the main form).
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//saves the graph from the original buffer to a 2 bit palleted png
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//saves the graph from the original buffer to a 2 bit greyscale png
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//saves the graph from the tbitmap into a 24 bit truecolor bitmap
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unit graphdrawu;
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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,pngwrite,pngwritetbitmap;
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type
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TForm1 = class(TForm)
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Image1: TImage;
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procedure FormCreate(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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pal : array[0..11] of byte;
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implementation
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{$R *.DFM}
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type
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tlinedata = array[word] of byte;
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plinedata = ^tlinedata;
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timagedata = array[word] of plinedata;
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pimagedata = ^timagedata;
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var
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imagedata : pimagedata;
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procedure TForm1.FormCreate(Sender: TObject);
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var
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counter : integer;
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inner : integer;
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y : integer;
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bitmapscanline : plinedata;
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tempfloat : extended;
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currentindex : integer;
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fracpart : integer;
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f : tpngwrite;
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stream : tfilestream;
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begin
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//black
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pal[ 0] := 0;
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pal[ 1] := 0;
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pal[ 2] := 0;
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//blue
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pal[ 3] := 0;
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pal[ 4] := 0;
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pal[ 5] := $FF;
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//red
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pal[ 6] := $FF;
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pal[ 7] := 0;
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pal[ 8] := 0;
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//white
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pal[ 9] := $ff;
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pal[10] := $ff;
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pal[11] := $FF;
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imagedata := allocmem(image1.height*sizeof(plinedata));
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image1.width := (image1.width div 4)*4;
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image1.width := image1.width;
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for counter := 0 to image1.height-1 do begin
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imagedata[counter] := allocmem(image1.width div 4);
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imagedata[counter][image1.width div 8] := imagedata[counter][image1.width div 8] or $C0;
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end;
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fillchar(imagedata[image1.height div 2]^,image1.width div 4,#$FF);
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for counter := 0 to image1.width-1 do begin
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// tempfloat := ;
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for fracpart := 0 to 15 do begin
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y := round( -sin((( (counter+(fracpart/15)) / image1.width){+0.5}) *2*pi ) *((image1.height-20)div 2) )+((image1.height)div 2);
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//writeln(y);
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imagedata[y][counter div 4] := (imagedata[y][counter div 4]) or (1 shl (((counter and $3)xor$3)*2) );
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y := round( -cos((( (counter+(fracpart/15)) / image1.width){+0.5}) *2*pi ) *((image1.height-20)div 2) )+((image1.height)div 2);
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//writeln(y);
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imagedata[y][counter div 4] := (imagedata[y][counter div 4]) or (2 shl (((counter and $3)xor$3)*2) );
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end ;
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end;
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image1.Picture.Bitmap.PixelFormat :=pf24bit;
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image1.picture.bitmap.width := image1.width;
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image1.picture.bitmap.height := image1.height;
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for counter := 0 to image1.height-1 do begin
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bitmapscanline := image1.picture.bitmap.ScanLine[counter];
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for inner := 0 to image1.width-1 do begin
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currentindex := (imagedata[counter][inner div 4] shr (((inner and $3)xor$3)*2) ) and $3;
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//if (counter=0) and (imagedata[counter][inner div 4] <> 0) then begin
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// writeln(imagedata[counter][inner div 4]);
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// writeln(currentindex);
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// writeln;
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//end;
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bitmapscanline[(inner*3) ] := pal[(currentindex*3)+2];
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bitmapscanline[(inner*3)+1] := pal[(currentindex*3)+1];
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bitmapscanline[(inner*3)+2] := pal[(currentindex*3) ];
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end;
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end;
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image1.invalidate;
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stream := tfilestream.Create('truecolor.png',fmCreate{fmOpenWrite} or fmShareDenyNone );
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try
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savetbitmaptopng(image1.picture.Bitmap,stream);
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finally
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stream.Free;
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end;
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stream := tfilestream.Create('4grey.png',fmCreate{fmOpenWrite} or fmShareDenyNone );
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try
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pngstart(f,stream,2,ctgreyscale ,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,imagedata[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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stream := tfilestream.Create('4color.png',fmCreate{fmOpenWrite} or fmShareDenyNone );
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try
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pngstart(f,stream,2,ctpallette ,image1.picture.Bitmap.Height,image1.Picture.Bitmap.Width);
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pngwritepal(f,@pal,4);
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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,imagedata[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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