PHP图像操作教程:3D图、缩放、旋转、裁剪、添加水印_PHP教程
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![]() 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![]() |
3、PHP对图像的裁剪
代码如下 | |
裁剪之前![]() 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![]() |
4、PHP为图像添加水印
代码如下 | |
没有水印![]() 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![]() |

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