Finding X & Y co-ords of text on an image

[helraizer1]

Hi all,

I have a dynamic image that picks out data from a dynamically created .line file.

showimage.php(5)

<?php
include("linesfile.php5");
$linesDataFile = new DataFile("data.line");
 
//$image = ImageCreate(660,240); // create the image canvas
$image = ImageCreateFromPNG("background.png");
$blue = ImageColorAllocate($image, 200, 200, 255); // prepare some blueness
$black = ImageColorAllocate($image, 0, 0, 0); // ... and whiteness
 
$cur_line_y = 63;  // This stores how far down the image the current line will print
$cur_line_x = 24; // This stores how far across the image the current line will print
$pagecharwidth = 75; // this is the maximum length of the line before it wraps;
$lineheight = 15; // This is how much to move down to print the next line
$pagelinelimit = 12; // This is the maximum number lines of text that can be displayed
 
ImageFill($image, 0, 0, $blue); // fill the canvas
 
//ImageString($image, 3, 15, $cur_line_y, trim(stripslashes($wordwrapped[0])), $black);
 
$numberOfLines = $pagelinelimit;
 
 
 
for($i=0;$i<$numberOfLines;$i++) {
    $data = $linesDataFile->getReverseIterate();
    if (count($data)==0) continue;
    $name = "[" . $data[0] . "] ";
    $color = $data[1];
    $font = $data[2];
    $line = $data[3];
 
    $line = $name . $line;
 
 
 
//ImageString($image, 2, $cur_line_x, $cur_line_y, trim($line), getColor($color));
 
 
            imagettftext($image,10,0,$cur_line_x,$cur_line_y,getColor($color),getfont($font),trim($line));
 
    $cur_line_y += $lineheight;
 
}
 
function getColor($color) {
    global $image;
 
    switch($color) {
        case "black" :
            return ImageColorAllocate($image, 0, 0, 0); 
        case "white" :
            return ImageColorAllocate($image, 255, 255, 255); 
        case "blue" :
            return ImageColorAllocate($image, 0, 0, 205); 
        case "red" :      
            return ImageColorAllocate($image, 255, 0, 0); 
        case "yellow" :
            return ImageColorAllocate($image, 255, 255, 0); 
        case "green" :
            return ImageColorAllocate($image, 0, 255, 0); 
                case "orange" :
                        return ImageColorAllocate($image, 255, 127, 36);
                case "aqua" :
                        return ImageColorAllocate($image, 0, 255, 255);
        default: 
            return ImageColorAllocate($image, 255, 255, 255); 
 
    }
}
 
function getfont($font) {
    global $image;
    global $font;
 
    switch($font) {
        case "fixedsys" :
            return "fixedsys.ttf";
        case "Courbd" :
            return "courbd.ttf";
        case "arial" :
            return "arialbd.ttf";
        case "timesnr" :
            return "timesbd.ttf";
        case "calibri" :
            return "calibrib.ttf";
        case "comicsans" :
            return "comicsans.ttf";
        case "palab" :
            return "palab.ttf";
        default:
            return "courbd.ttf";
    }
}
 
 
header("Content-Type: image/png"); // tell the browser what we're gonna give it
ImagePng($image); // paint the image in browser
ImagePng($image, "./chatbox.png"); //export as png file
ImageDestroy($image); // clean up resources
?>

the php in Index.php

<?php
            include("linesfile.php5");
            $filename = "data.line";
            set_magic_quotes_runtime(0);
            if ($_POST['submit']) {
            // grab the inputted text
            $text = stripcslashes($_POST['input'] . "\n");
            $username = stripslashes($_POST['username']);
            $color = $_POST['color'];
            $font = $_POST['font'];
            $ip = $_SERVER['REMOTE_ADDR'] . "\n";
            $_SESSION['username'] = $username;
            $_SESSION['color'] = $color;
 
 
                    $dirty = array('many', 'bad', 'words', 'in', 'here'); // I took out the real array just to keep the thread 'clean'.
 
                        foreach($dirty AS $bad_word){
                        $text = preg_replace("/$bad_word/i","****", $text);
                      }
            $data[] ="\n".$username;
            $data[] =trim($color);
            $data[] =trim($font);
            $data[] =trim($text);
 
 
            $datafile = new DataFile($filename);
            if(!$datafile->writeNewLine($data)) die("Error writing to file");
}
          ?>

my plan/idea is to impliment smilies into the image. If the user enters data such as 'Yay, it works!! =D' it will replace '=D' with a .gif image.

To do this I believe I will use Imagecopymerge(). but how would I go about getting the X & Y co-ords for the text that needs changing, in this case '=D'? Baring in mind that everytime a new post is submitted the previous line is moved down.

How would I do this?

Thanks,
Sam

myChatbox - the site, just so you get a feel for the image and input

[pbmods]

Heya, Sam.

No good way to do it that I know of. I think you're hitting the limit of what a graphical chatbox can do.