PHP制作3D扇形统计图以及对图片进行缩放操作实例

1、利用php gd库的函数绘制3D扇形统计图

<?phpheader("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);?>

效果：

2、对图片进行缩放

<div><h4>原图大小</h4><img src="1.png"></div><?phpheader("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');?><div><h4>缩放后的大小</h4><img src="test.png"></div>

效果：