我们在很多网站会看到一些图形的百分比显示图，像三个地区所占地多少或者是成绩等，给大家介绍一款用php生成的扇形比例百分比显示程序代码，不过使用它首先得有phpGD库支持，代码如下:

1. <?php
2. //填充图表的参数
3. $ChartDiameter = 60; //图表直径
4. $ChartData = array(30,70);//用于生成图表的数据，可通过数据库来取得来确定也可以多个不过和颜色数组对应
5. //把角度转换为弧度
6. function radians($degrees){return($degrees*(pi()/180.0));}
7. //取得在圆心为（0，0）圆上 x,y点的值
8. function circle_point($degrees,$diameter){$x=cos(radians($degrees))*($diameter/2);$y=sin(radians($degrees))*($diameter/2);return (array($x,$y));}
9. //确定图形的大小
10. $ChartWidth = $ChartDiameter + 20;
11. $ChartHeight = $ChartDiameter + 20;
12. //确定统计的总数
13. $ChartTotal = “”;
14. for($index = 0;$index < count($ChartData);$index++){
15. $ChartTotal += $ChartData[$index];
16. }
17. $ChartCenterX = $ChartDiameter/2 + 10;
18. $ChartCenterY = $ChartDiameter/2 + 10;
19. //生成空白图形
20. $image = imagecreate($ChartWidth, $ChartHeight);
21. //分配颜色
22. $colorBody = imagecolorallocate($image, 0xFF, 0xFF, 0xFF);
23. $colorBorder = imagecolorallocate($image, 0×00, 0×00, 0×00);
24. $colorText = imagecolorallocate($image, 0×00, 0×00, 0×00);
25. $colorSlice[] = imagecolorallocate($image, 0xFF, 0×00, 0×00);//这里是和你上面写的数组对应的颜色
26. $colorSlice[] = imagecolorallocate($image, 0×00, 0xFF, 0×00);
27. //填充背境
28. imagefill($image, 0, 0, $colorBody);
29. //画每一个扇形
30. $Degrees = 0;
31. for($index = 0; $index < count($ChartData); $index++){
32. $StartDegrees = round($Degrees);
33. $Degrees += (($ChartData[$index]/$ChartTotal)*360);
34. $EndDegrees = round($Degrees);
35. $CurrentColor = $colorSlice[$index%(count($colorSlice))];
36. //画图F
37. imagearc($image,$ChartCenterX,$ChartCenterY,$ChartDiameter,$ChartDiameter,$StartDegrees,$EndDegrees, $CurrentColor);
38. //画直线
39. list($ArcX, $ArcY) = circle_point($StartDegrees, $ChartDiameter);
40. imageline($image,$ChartCenterX,$ChartCenterY,floor($ChartCenterX + $ArcX),
41. floor($ChartCenterY + $ArcY),$CurrentColor);
42. //画直线
43. list($ArcX, $ArcY) = circle_point($EndDegrees, $ChartDiameter);
44. imageline($image,$ChartCenterX,$ChartCenterY,ceil($ChartCenterX + $ArcX),
45. ceil($ChartCenterY + $ArcY),$CurrentColor);
46. //填充扇形
47. $MidPoint = round((($EndDegrees – $StartDegrees)/2) + $StartDegrees);
48. list($ArcX, $ArcY) = circle_point($MidPoint, $ChartDiameter/2);
49. imagefilltoborder($image,floor($ChartCenterX + $ArcX),floor($ChartCenterY + $ArcY),
50. $CurrentColor,$CurrentColor);
51. } //phpfensi.com
52. //到此脚本 已经生了一幅图像的，现在需要的是把它发到浏览器上，重要的一点是要将标头发给浏览器，让它知道是一个GIF文件。不然的话你只能看到一堆奇怪的乱码
53. header(“Content-type: image/png”);
54. imagegif($image);
55. ?>