标签:header com ubi imagej code lin type info with
首先得确定php.ini设置有没有打开GD扩展功能,測试例如以下
print_r(gd_info());
Array ( [GD Version] => bundled (2.0.34 compatible) [FreeType Support] => 1 [FreeType Linkage] => with freetype [T1Lib Support] => 1 [GIF Read Support] => 1 [GIF Create Support] => 1 [JPG Support] => 1 [PNG Support] => 1 [WBMP Support] => 1 [XPM Support] => [XBM Support] => 1 [JIS-mapped Japanese Font Support] => )
GD绘图一般过程例如以下:
1.创建一张画布资源
2.创建颜色画笔
3.绘图
4.保存图片或输出图片
5.销毁内存画布资源
測试代码例如以下:
<?php header("Content-type: image/jpeg"); $width = 400; //宽。高 $height = 400; $image = imagecreate($width, $height); //第一步:创建空白图像 $white = imagecolorallocate($image, 0, 0, 0); //第一次对 imagecolorallocate() 的调用会给基于调色板的图像填充背景色,即用 imagecreate() 建立的图像。 $green = imagecolorallocate($image, 0, 255, 0); //第二步:为图像分配颜色 imageline($image, 0, 20, 400, 20, $green); //第三步:画线 imagerectangle($image,100,40,300,100,$green); //画矩形 imagearc($image, 200, 150, 90, 90, 0, 360, $green); //画圆 imagestring($image, 14, 100, 240, "PHP is NiuBi HongHong!", $green); //写字符串 $str="abcdefghjklmnpqrstuvwxyz23456789"; $randstr = substr(str_shuffle($str), 0,4); imagestring($image, 14, 100, 260, $randstr, $green); //验证码 imagettftext($image, 14, 0, 100, 300, $green, ‘./MSJHBD.TTF‘, "中文vsEnglish"); //中文验证 // imagejpeg($image,‘./test.jpg‘); //在当前路径下保存图片为test.jpg imagejpeg($image); //第四步:不加文件名称。直接输出到网页 imagedestroy($image); //第五步:销毁,回收资源 ?>
注:GD库强大的能够画各种报表(如柱状图,饼状图等)、缩略图、加水印图和股票走势图
缩略图功能样例:
<?php header("Content-type: image/png"); $width = 300; //原图宽。高 $height = 210; $thumb_width = (int)$width/2; $thumb_height = (int)$height/2; $dst = imagecreate($thumb_width,$thumb_height); //创建缩略图画布 $gray = imagecolorallocate($dst, 100, 100, 100); $src = imagecreatefrompng(‘./me.png‘); //读取原图 //把原图copy到缩略图画布上 imagecopyresampled($dst, $src, 0, 0, 0, 0, $thumb_width, $thumb_height, $width, $height); imagepng($dst,‘./me_thumb.png‘); imagedestroy($dst); imagedestroy($src); ?>
标签:header com ubi imagej code lin type info with
原文地址:http://www.cnblogs.com/jhcelue/p/6806371.html