PHP图像操作：3D图、缩放、旋转、裁剪、添加水印（一）

来源：http://www.ido321.com/875.html

1、利用php gd库的函数绘制3D扇形统计图

   1: <?php

   2: header("content-type","text/html;charset=utf-8");

   3: /*扇形统计图*/

   4: $image = imagecreatetruecolor(100, 100);    /*创建画布*/

   5:

   6: /*设置画布需要的颜色*/

   7: $white = imagecolorallocate($image,0xff,0xff,0xff);

   8: $gray = imagecolorallocate($image, 0xc0, 0xc0, 0xc0);

   9: $darkgray = imagecolorallocate($image, 0x90, 0x90, 0x90);

  10: $navy = imagecolorallocate($image, 0x00, 0x00, 0x80);

  11: $darknavy = imagecolorallocate($image, 0x00, 0x00, 0x50);

  12: $red = imagecolorallocate($image, 0xff, 0x00, 0x00);

  13: $darkred = imagecolorallocate($image, 0x90, 0x00, 0x00);

  14:

  15: /*填充背景色*/

  16: imagefill($image, 0, 0, $white);

  17:

  18: /*3D制作*/

  19: for($i = 60; $i > 50; $i--)

  20: {

  21:     imagefilledarc($image, 50, $i, 100, 50, -160, 40, $darknavy, IMG_ARC_PIE);

  22:     imagefilledarc($image, 50, $i, 100, 50, 40, 75, $darkgray, IMG_ARC_PIE);

  23:     imagefilledarc($image, 50, $i, 100, 50, 75, 200, $darkred, IMG_ARC_PIE);

  24: }

  25: /*画椭圆弧并填充*/

  26: imagefilledarc($image, 50, 50, 100, 50, -160, 40, $darknavy, IMG_ARC_PIE);

  27: imagefilledarc($image, 50, 50, 100, 50, 40, 75, $darkgray, IMG_ARC_PIE);

  28: imagefilledarc($image, 50, 50, 100, 50, 75, 200, $darkred, IMG_ARC_PIE);

  29:

  30: /*画字符串*/

  31: imagestring($image, 3, 15, 55, "30%", $white);

  32: imagestring($image, 3, 45, 35, "60%", $white);

  33: imagestring($image, 3, 60, 60, "10%", $white);

  34:

  35: /*输出图像*/

  36: header("content-type:image/png");

  37: imagepng($image);

  38:

  39: /*释放资源*/

  40: imagedestroy($image);

  41: ?>

效果：

2、对图片进行缩放

   1: <div>

   2:     <h4>原图大小</h4>

   3:     <img src="1.png" style="border:1px solid red;">

   4: </div>

   5: <?php

   6: header("content-type","text/html;charset=utf-8");

   7:

   8: /*

   9: *图片缩放

  10: *@param string $filename   图片的url

  11: *@param int    $width      设置图片缩放的最大宽度

  12: *@param int    $height     设置图片缩放的最大高度

  13: */

  14: function thumb($filename,$width=130,$height=130)

  15: {

  16:     /*获取原图的大小*/

  17:     list($width_orig,$height_orig) = getimagesize($filename);

  18:

  19:     /*根据参数$width和$height，换算出等比例的高度和宽度*/

  20:     if($width && ($width_orig < $height_orig))

  21:     {

  22:         $width = ($height / $height_orig) * $width_orig;

  23:     }

  24:     else

  25:     {

  26:         $height = ($width / $width_orig) * $height_orig;

  27:     }

  28:

  29:     /*以新的大小创建画布*/

  30:     $image_p = imagecreatetruecolor($width, $height);

  31:

  32:     /*获取图像资源*/

  33:     $image = imagecreatefrompng($filename);

  34:

  35:     /*使用imagecopyresampled缩放*/

  36:     imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);

  37:

  38:     /*保存缩放后的图片和命名*/

  39:     imagepng($image_p,‘test.png‘);

  40:

  41:     /*释放资源*/

  42:     imagedestroy($image_p);

  43:     imagedestroy($image);

  44: }

  45: /*调用函数*/

  46: thumb(‘1.png‘);

  47: ?>

  48: <div>

  49:     <h4>缩放后的大小</h4>

  50:     <img src="test.png" style="border:1px solid red;">

  51: </div>

效果：