PHP实现绘制3D扇形统计图及图片缩放实例

PHP教程
  <?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);
  $gray = imagecolorallocate($image,0xc0,0xc0);
  $darkgray = imagecolorallocate($image,0x90,0x90);
  $navy = imagecolorallocate($image,0x00,0x80);
  $darknavy = imagecolorallocate($image,0x50);
  $red = imagecolorallocate($image,0x00);
  $darkred = imagecolorallocate($image,0x00);
 
  /*填充背景色*/
  imagefill($image,$white);
 
  /*3D制作*/
  for($i = 60; $i > 50; $i--)
  {
    imagefilledarc($image,50,$i,100,-160,40,$darknavy,IMG_ARC_PIE);
    imagefilledarc($image,75,$darkgray,200,$darkred,IMG_ARC_PIE);
  }
  /*画椭圆弧并填充*/
  imagefilledarc($image,IMG_ARC_PIE);
  imagefilledarc($image,IMG_ARC_PIE);
 
  /*画字符串*/
  imagestring($image,3,15,55,"30%",$white);
  imagestring($image,45,35,"60%",60,"10%",$white);
 
  /*输出图像*/
  header("content-type:image/png");
  imagepng($image);
 
  /*释放资源*/
  imagedestroy($image);
  ?>

PHP教程
  <div>
    <h4>原图大小</h4>
    <img src="1.png" style="border:1px solid red;">
  </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,$width,$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" style="border:1px solid red;">
  </div>