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
 string $filename   图片的url
 int    $width      设置图片缩放的最大宽度
 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