java qr code app Generate all images in Java

Encoder QR Code in Java Generate all images

Generate all images
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$self->{text} =~ s#\n\s*\n#</p><p>#g;
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Empty lines are paragraph separators
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my $h = CGI->new(); my $html_name = "$self->{out_dir}/$self->{html_name}"; open(OUT, ">$html_name") or die "Cannot open $html_name: $!"; print OUT $h->start_html( -title => $self->{title} || $self->{name}, -bgcolor => '#ffffe7' ), $h->table({-cellpadding => 20, -bgcolor => '#ffffe7'}, $h->Tr({-valign => 'top'},
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Create the HTML file for this photo
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$h->td({-bgcolor => '#ffd7d7', -valign => 'center'}, $h->img({src => $self->{pic_name}, Put in the width => $self->{width}, image tag height => $self->{height}}), ), $h->td({-width => '100%'}, And write the text $h->tt($h->p($self->{text})), ),
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), ), $h->end_html(); }
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This method creates the single picture pages (see figure 6.3) for the photo album. Before doing this, the code first checks that the necessary output directories exist, creating them where necessary. Then the generate_images() method is called, which is responsible for making certain that the full-size picture and the thumbnail exist, and for reading in their dimensions. Since the rest of the code in this method is almost self-explanatory, we ll jump right ahead and have a look at generate_images():
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sub generate_images { my $self = shift; my $rc; my $im = Image::Magick->new(); my $pic_name = "$self->{out_dir}/$self->{pic_name}"; if (-f $pic_name && !$self->{overwrite}) { The image warn "Won't overwrite $pic_name\n"; already exists $rc = $im->Read($pic_name); warn $rc if $rc; } else { foreach my $ext qw(tif tiff png jpg jpeg gif) { $rc = $im->Read( "$self->{source_dir}/$self->{name}.$ext"); last unless $rc; } warn($rc), return if $rc;
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Find a source image
$im->Scale(geometry => "$self->{pic_size}x$self->{pic_size}"); $im->Set(filename => $pic_name); $rc = $im->Write(); warn $rc if $rc; }
Create a webready resized version of image
IMAGE COLLECTIONS AND THUMBNAILING
$self->{width} = $im->Get('width'); $self->{height} = $im->Get('height');
Memorize dimensions of image
my $thumb; my $thumb_name = "$self->{out_dir}/$self->{thumb_name}"; if (-f $thumb_name && !$self->{overwrite}) { warn "Won't overwrite $thumb_name\n"; The thumbnail image already $thumb = Image::Magick->new(); exists $rc = $thumb->Read($thumb_name); warn $rc if $rc; } else { $thumb = $im->Clone(); $thumb->Scale(geometry => Create a "$self->{thumb_size}x$self->{thumb_size}"); thumbnail $thumb->Set(filename => $thumb_name); from current $rc = $thumb->Write(); image warn $rc if $rc; } Memorize $self->{thumb_width} = $thumb->Get('width'); dimensions of $self->{thumb_height} = $thumb->Get('height');
thumbnail
This is where all the image manipulation takes place. This subroutine checks whether the output image already exists, and if so, it is read into the $im Image::Magick object. Reading in the image has to be done in order to create a thumbnail version of it, and we need to know its dimensions to generate decent HTML.
If the image doesn t yet exist, the source_dir directory is checked for images with the same base name and one of the extensions from a predefined list. If no matching source images can be found, a warning is emitted and the subroutine is terminated. If a source image can be found, it is read into the Image::Magick object, resized to fit inside a square of pic_size pixels, and written to the output image location. Once we are certain that we have an image loaded in $im, we store the image dimensions so that they can be used to generate correct HTML image tags for it. If a thumbnail image already exists on disk, it is loaded into the $thumb Image::Magick object. If no thumbnail image exists, one is created by making a copy of the $im object which contains the full-size image, resizing that copy, and writing it to disk. Once we are certain a thumbnail exists, its dimensions are stored for future reference while building the HTML. To finish off the module, we need to return a true value.
"This is the end of Picture.pm";
GRAPHICS AND THE WEB
Limitations of the program
In the current incarnation of this program, all the pictures need a unique name. This can be easily solved by prefixing the names of the resulting images with some mangled string that is based on the source directory from which the image was read. The HTML for output is hard-coded in the Picture module. It would probably be more flexible to use template files, or to allow callbacks that actually create the HTML. However, to be fully flexible there, complicated code needs to be created. I judged it easier to just create new modules if I needed a different look and feel. Instead of creating fully new modules, it is often enough to use the classes presented here as parent classes, and to override only the parts of the code that need to be changed, i.e., the generate_output() and index_entry() methods. The general layout idea remains the same for all child classes, however. If a totally different layout is wanted, a totally new piece of code needs to be written. The design of the three classes isn t as neatly organized and cleanly separated as it could be.
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