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);
  ?>

  <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, 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" style="border:1px solid red;">
  </div>