PHP实现绘制3D扇形统计图及图片缩放实例，

<?php 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); ?>

 
原图大小
  
 <?php 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 < $height_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