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

<?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);  
?>

效果：

2、对图片进行缩放

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

效果：