17-1.php3

linux操作系统中 php 核心编程所有例程 都是一些很不错的案例

<?
	/*
	** GIF button
	** Creates a graphical button based
	** form variables.
	*/
	
	//set parameters if not given
	if(!isset($ButtonWidth))
	{
		$ButtonWidth = 100;
	}
	
	if(!isset($ButtonHeight))
	{
		$ButtonHeight = 30;
	}

	if(!isset($ButtonLabel))
	{
		$ButtonLabel = "CLICK";
	}

	if(!isset($ButtonFont))
	{
		$ButtonFont = 5;
	}

	//create image and colors
	$image = imagecreate($ButtonWidth, $ButtonHeight);
	$colorBody = imagecolorallocate($image, 0x99, 0x99, 0x99);
	$colorShadow = imagecolorallocate($image, 0x33, 0x33, 0x33);
	$colorHighlight = imagecolorallocate($image, 0xCC, 0xCC, 0xCC);

	//create body of button
	imagefilledrectangle($image, 
		1, 1, $ButtonWidth-2, $ButtonHeight-2,
		$colorBody);


	//draw bottom shadow
	imageline($image, 
		0, $ButtonHeight-1, 
		$ButtonWidth-1, $ButtonHeight-1, 
		$colorShadow);

	//draw right shadow
	imageline($image, 
		$ButtonWidth-1, 1, 
		$ButtonWidth-1, $ButtonHeight-1, 
		$colorShadow);

	
	//draw top highlight
	imageline($image, 
		0, 0, 
		$ButtonWidth-1, 0, 
		$colorHighlight);

	//draw left highlight
	imageline($image, 
		0, 0, 
		0, $ButtonHeight-2, 
		$colorHighlight);


	//determine label size
	$ButtonLabelHeight = imagefontheight($ButtonFont); 
	$ButtonLabelWidth = imagefontwidth($ButtonFont) * 
		strlen($ButtonLabel);

	//determine label upper left corner
	$ButtonLabelX = ($ButtonWidth - $ButtonLabelWidth)/2;
	$ButtonLabelY = ($ButtonHeight - $ButtonLabelHeight)/2;
	

	//draw label shadow
	imagestring($image,
		$ButtonFont,
		$ButtonLabelX+1,
		$ButtonLabelY+1,
		$ButtonLabel,
		$colorShadow);

	//draw label
	imagestring($image,
		$ButtonFont,
		$ButtonLabelX,
		$ButtonLabelY,
		$ButtonLabel,
		$colorHighlight);

	//output image
	header("Content-type: image/gif");
	imagegif($image);
?>