PHP实现绘制3D扇形统计图及图片缩放实例

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" 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>

效果：