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Problem You have set up a simple drag-and-drop image viewer in How to create a simple drag and drop image viewer?
Now you would like to imprint some text (e.g. date) on the photo as shown below:
 How to create a simple drag and drop image viewer?.jpg" alt="How to create a simple drag and drop image viewer?" />
Solution Please refer to How to rotate an image? on the use of GD2 with php-gtk2. We employ exactly the same technique as described in the article.
- Use imagettfbbox to find out the width and height of the text that will be printed on the photo.
- Imprint the date with imagettftext.
Sample Code 1
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| <?php
$window = new GtkWindow();
$window->set_size_request(240, 200);
$window->connect_simple('destroy', array('Gtk','main_quit'));
$img = new GtkImage();
$img->drag_dest_set(Gtk::DEST_DEFAULT_ALL,
array( array( 'text/uri-list', 0, 0)), Gdk::ACTION_COPY);
$img->connect('drag-data-received', 'on_drop', $img);
// Set up gtkentry to get rotation angle
$vbox = new GtkVBox();
$button = new GtkButton('Imprint date');
$button->set_size_request(-1,24);
$hbox = new GtkHBox();
$hbox->pack_start(new GtkLabel('Date: '), 0, 0);
$date = date('Y-m-d');
$angle = new GtkEntry($date);
$angle->set_size_request(100, -1);
$button->connect('clicked', 'on_button', $angle);
$hbox->pack_start($angle, 0, 0);
$hbox->pack_start(new GtkLabel(' '), 0, 0);
$hbox->pack_start($button, 0, 0);
$vbox->pack_start($hbox, 0, 0);
$vbox->pack_start($img);
$window->add($vbox);
$window->show_all();
Gtk::main();
// process drop
function on_drop($widget, $context, $x, $y, $data, $info, $time, $img) {
$uri_list = explode("\n",$data->data);
global $img_file;
$img_file = $uri_list[0];
$img_file = str_replace("file:///", "", $img_file);
$img_file = str_replace("\r", "", $img_file);
global $pixbuf;
$pixbuf=GdkPixbuf::new_from_file($img_file);
$width = $pixbuf->get_width();
$height = $pixbuf->get_height();
$img->set_from_pixbuf($pixbuf);
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- Note that this is only 70% of the sample code. You have to be a registered member to see the entire sample code. Please login or register.
- Registration is free and immediate.
- Have some doubt about the registration? Please read this forum article.
And here's the code for imprint_date.php. Note that the processed image is stored at c:\ root folder. You may change it to any other location you like.
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| <?php
$img_file = $argv[1]; // the image filename
$text = $argv[2]; // the date
$processed_img_file = "c:\processed_img";
list($img_width,$img_height, $img_type) = getimagesize($img_file);
echo "img_size = $img_width x $img_height ($img_type)\n";
switch($img_type) {
case 1: $img = imagecreatefromgif($img_file); break;
case 2: $img = imagecreatefromjpeg($img_file); break;
case 3: $img = imagecreatefrompng($img_file); break;
default: echo "unsupported file format\n"; exit(1);
}
$font_color = imagecolorallocate($img, 255, 153, 24); // set the font color
$font = 'arial.ttf'; // specify the truetype font
$angle = 0; // angle of the text
$fontsize = 16; // set the font size
$bbox = imagettfbbox ($fontsize, $angle, $font, $text); // note 1
$text_width = $bbox[2] - $bbox[0]; // note 1
$text_height = $bbox[1] - $bbox[7]; // note 1
$x_margin = 10;
$y_margin = 2;
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- Note that this is only 70% of the sample code. You have to be a registered member to see the entire sample code. Please login or register.
- Registration is free and immediate.
- Have some doubt about the registration? Please read this forum article.
Explanation This example make use of the method as described in How to rotate an image?.
What's new here:
- Get the width and height of the bounding box of the date that will be imprinted.
- Calculate the start position of the date. Note that we leave some x and y margin from the bottom right-hand corner of the image.
- Imprint the date!
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