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PHP图像操作教程:3D图、缩放、旋转、裁剪、添加水印

   图片操作在网站的应用相当广范,特别是现在互联网高度发达,很多内容都是以图片来显示,现在我们来讲讲用php来操作上传的图片,3D图片绘制、图片缩放、图片旋转、图片裁剪、图片添加水印。

  1、利用php gd库的函数绘制3D扇形统计图

代码如下  
header("content-type","text/html;charset=utf-8");
/*扇形统计图*/
$image = imagecreatetruecolor(100, 100); /*创建画布*/
/*设置画布需要的颜色*/
$white = imagecolorallocate($image,0xff,0xff,0xff);
$gray = imagecolorallocate($image, 0xc0, 0xc0, 0xc0);
$darkgray = imagecolorallocate($image, 0x90, 0x90, 0x90);
$navy = imagecolorallocate($image, 0x00, 0x00, 0x80);
$darknavy = imagecolorallocate($image, 0x00, 0x00, 0x50);
$red = imagecolorallocate($image, 0xff, 0x00, 0x00);
$darkred = imagecolorallocate($image, 0x90, 0x00, 0x00);

/*填充背景色*/
imagefill($image, 0, 0, $white);

/*3D制作*/
for($i = 60; $i > 50; $i--)
{
imagefilledarc($image, 50, $i, 100, 50, -160, 40, $darknavy, IMG_ARC_PIE);
imagefilledarc($image, 50, $i, 100, 50, 40, 75, $darkgray, IMG_ARC_PIE);
imagefilledarc($image, 50, $i, 100, 50, 75, 200, $darkred, IMG_ARC_PIE);
}

/*画椭圆弧并填充*/
imagefilledarc($image, 50, 50, 100, 50, -160, 40, $darknavy, IMG_ARC_PIE);
imagefilledarc($image, 50, 50, 100, 50, 40, 75, $darkgray, IMG_ARC_PIE);
imagefilledarc($image, 50, 50, 100, 50, 75, 200, $darkred, IMG_ARC_PIE);


/*画字符串*/
imagestring($image, 3, 15, 55, "30%", $white);
imagestring($image, 3, 45, 35, "60%", $white);
imagestring($image, 3, 60, 60, "10%", $white);

/*输出图像*/
header("content-type:image/png");
imagepng($image);

/*释放资源*/
imagedestroy($image);
?>

  2、对图片进行缩放

代码如下  

原图大小


PHP图像操作教程:3D图、缩放、旋转、裁剪、添加水印_PHP教程


header("content-type","text/html;charset=utf-8");

/*
*图片缩放
*@param string $filename 图片的url
*@param int $width 设置图片缩放的最大宽度
*@param int $height 设置图片缩放的最大高度
*/
function thumb($filename,$width=130,$height=130)
{
/*获取原图的大小*/
list($width_orig,$height_orig) = getimagesize($filename);

/*根据参数$width和$height,换算出等比例的高度和宽度*/
if($width && ($width_orig {
$width = ($height / $height_orig) * $width_orig;
}
else
{
$height = ($width / $width_orig) * $height_orig;
}

/*以新的大小创建画布*/
$image_p = imagecreatetruecolor($width, $height);

/*获取图像资源*/
$image = imagecreatefrompng($filename);

/*使用imagecopyresampled缩放*/
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);

/*保存缩放后的图片和命名*/

imagepng($image_p,'test.png');

/*释放资源*/

imagedestroy($image_p);
imagedestroy($image);
}

/*调用函数*/
thumb('1.png');
?>


缩放后的大小


PHP图像操作教程:3D图、缩放、旋转、裁剪、添加水印_PHP教程

  3、PHP对图像的裁剪

代码如下  

裁剪之前


PHP图像操作教程:3D图、缩放、旋转、裁剪、添加水印_PHP教程


header("content-type","text/html;charset=utf-8");
/*
*图片裁剪
*@param string $filename 图片的url
*@param int $width 图片裁剪宽度
*@param int $height 图片裁剪高度
*@param int $x 裁剪图片左边开始的位置
*@param int $y 裁剪图片顶边开始的位置
*/
function cut($filename,$x,$y,$width,$height)
{
/*获取图像资源,需要裁剪的图片*/
$image = imagecreatefrompng($filename);

/*以新的大小创建画布,保存裁剪后的图片*/

$image_p = imagecreatetruecolor($width, $height);

/*使用imagecopyresampled缩放*/
imagecopyresampled($image_p, $image, 0, 0, $x, $y, $width, $height, $width, $height);
/*保存裁剪后的图片和命名*/
imagepng($image_p,'test1.png');
/*释放资源*/
imagedestroy($image_p);
imagedestroy($image);
}

/*调用函数*/
cut('1.png',20,20,80,80);
?>


裁剪之后


PHP图像操作教程:3D图、缩放、旋转、裁剪、添加水印_PHP教程

  4、PHP为图像添加水印

代码如下  

没有水印


PHP图像操作教程:3D图、缩放、旋转、裁剪、添加水印_PHP教程


header("content-type","text/html;charset=utf-8");
/*
*给背景图片添加水印,背景图片格式png,水印格式gif
*@param string $filename 图片的url
*@param string $water 水印图片
*/
function watermark($filename,$water)
{
/*获取原图的大小*/
list($b_w,$b_h) = getimagesize($filename);
/*获取水印图片的大小*/
list($w_w,$w_h) = getimagesize($water);
/*在背景图片中放水印图片的随机起始位置*/
$posX =rand(0,($b_w - $w_w));
$posY =rand(0,($b_h - $w_h));
/*获取图像资源,需要裁剪的图片*/
$back = imagecreatefrompng($filename);
$water = imagecreatefromgif($water);
/*使用Inagecopy函数复制水印图片到指定位置*/
imagecopy($back, $water, $posX, $posY, 0, 0, $w_w, $w_h);
/*保存带水印的图片和命名*/
imagepng($back,'test2.png');
/*释放资源*/
imagedestroy($back);
imagedestroy($water);
}

/*调用函数*/
watermark('1.png','test.gif');
?>


加上水印


PHP图像操作教程:3D图、缩放、旋转、裁剪、添加水印_PHP教程

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