PHPBuilder - Text to PNG



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Text to PNG

by: Herman Veluwenkamp
|
August 15, 2000

Version: 1.0

Type: Full Script

Category: Graphics

License: GNU General Public License

Description: Render TTF Text to PNG. Text message, font, size, rotation, padding, color, background, and transparency can all be defined via URL.



<?
/*
To draw the PNG - call this script with a URL like the following:

http://www.yoursite.com/text_png.php3?msg=testing+class&rot=15&size=48&font=fonts/ARIAL.TTF
*/

Header("Content-type: image/png");

class textPNG {
	var $font = 'fonts/TIMES.TTF'; //default font. directory relative to script directory.
	var $msg = "undefined"; // default text to display.
	var $size = 24;
	var $rot = 0; // rotation in degrees.
	var $pad = 0; // padding.
	var $transparent = 1; // transparency set to on.
	var $red = 0; // white text...
	var $grn = 0;
	var $blu = 0;
	var $bg_red = 255; // on black background.
	var $bg_grn = 255;
	var $bg_blu = 255;

function draw() {
	$width = 0;
	$height = 0;
	$offset_x = 0;
	$offset_y = 0;
	$bounds = array();
	$image = "";
	
	// determine font height.
	$bounds = ImageTTFBBox($this->size, $this->rot, $this->font, "W");
	if ($this->rot < 0) {
		$font_height = abs($bounds[7]-$bounds[1]);		
	} else if ($this->rot > 0) {
		$font_height = abs($bounds[1]-$bounds[7]);
	} else {
		$font_height = abs($bounds[7]-$bounds[1]);
	}

	// determine bounding box.
	$bounds = ImageTTFBBox($this->size, $this->rot, $this->font, $this->msg);
	if ($this->rot < 0) {
		$width = abs($bounds[4]-$bounds[0]);
		$height = abs($bounds[3]-$bounds[7]);
		$offset_y = $font_height;
		$offset_x = 0;
		
	} else if ($this->rot > 0) {
		$width = abs($bounds[2]-$bounds[6]);
		$height = abs($bounds[1]-$bounds[5]);
		$offset_y = abs($bounds[7]-$bounds[5])+$font_height;
		$offset_x = abs($bounds[0]-$bounds[6]);
		
	} else {
		$width = abs($bounds[4]-$bounds[6]);
		$height = abs($bounds[7]-$bounds[1]);
		$offset_y = $font_height;;
		$offset_x = 0;
	}
	
	$image = imagecreate($width+($this->pad*2)+1,$height+($this->pad*2)+1);
	
	$background = ImageColorAllocate($image, $this->bg_red, $this->bg_grn, $this->bg_blu);
	$foreground = ImageColorAllocate($image, $this->red, $this->grn, $this->blu);
	
	if ($this->transparent) ImageColorTransparent($image, $background);
	ImageInterlace($image, false);
	
	// render it.
	ImageTTFText($image, $this->size, $this->rot, $offset_x+$this->pad, $offset_y+$this->pad, $foreground, $this->font, $this->msg);
	
	// output PNG object.
	imagePNG($image);
}
}

$text = new textPNG;

if (isset($msg)) $text->msg = $msg; // text to display
if (isset($font)) $text->font = $font; // font to use (include directory if needed).
if (isset($size)) $text->size = $size; // size in points
if (isset($rot)) $text->rot = $rot; // rotation
if (isset($pad)) $text->pad = $pad; // padding in pixels around text.
if (isset($red)) $text->red = $red; // text color
if (isset($grn)) $text->grn = $grn; // ..
if (isset($blu)) $text->blu = $blu; // ..
if (isset($bg_red)) $text->bg_red = $bg_red; // background color.
if (isset($bg_grn)) $text->bg_grn = $bg_grn; // ..
if (isset($bg_blu)) $text->bg_blu = $bg_blu; // ..
if (isset($tr)) $text->transparent = $tr; // transparency flag (boolean).

$text->draw();
?>

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