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Article #464

Re: How to draw into a jpeg image

#464
From: Giuliano
Date: Wed, 02 Jun 2004 09:10
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On Wed, 2 Jun 2004 09:48:56 +0200, "Mario Sernicola"
<mariosernicola@nospam.libero.it> wrote:

>Ok, so I've to continue convert JPG into a BMP with an external software,
No, you can make it on the fly. For example, with BCB6 it's pretty seamless.

>I need to draw on TImage canvas in order to catch vertex pixel of a polygon
>that describes a shape contained in TImage. When the vertex are know, I
>don't need BMP anymore.
Please, take the following snippet like a starting point for your further
experiments:

#include <memory>
#include <Jpeg.hpp>

using std::auto_ptr;

void ProcessTheImage( void )
{
    // crea una istanza di TJPEGImage e ci carica dentro una immagine 
    auto_ptr<TJPEGImage> const JPG( new TJPEGImage );
    JPG->LoadFromFile( "nome del file.jpg" );

    // crea una DIB e gli assegna il contenuto del JPEG precedentemente
    // creato
    auto_ptr<Graphics::TBitmap> const BMP( new Graphics::TBitmap );
    BMP->Assign( JPG.get() );

    // Aggiunge una ellisse, giusto per "sporcare" un pochino l'immagine
    // originale
    BMP->Canvas->Ellipse( 10, 10, 100, 200 );

    // assegna di nuovo l'immagine modificata al JPEG
    JPG->Assign( BMP.get() );

    // Salva su file, 
    JPG->SaveToFile( "nome del nuovo file.jpg" );

    // oppure... assegna il JPEG appena creato ad un componente TImage
    Image1->Picture->Bitmap->Assign( JPG.get() );
}

Ciao

Giuliano
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From: Giuliano <gcardinali@remove.adhoc.net>
Newsgroups: borland.public.cppbuilder.multimedia
Subject: Re: How to draw into a jpeg image
Date: Wed, 02 Jun 2004 11:10:32 +0200
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