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：