饼图生成类及示例

根据传入参数自动生成饼图。

2. /*
3. * 生成饼形图片
4. */
5. class PieChart {
6. private $center; //饼形中点
7. private $width; //饼形直径
8. private $image; //图形对象
10. function __construct($width,$backcolor = array(array("r"=>0xFF,"g"=>0xFF,"b"=>0xFF))) {
11. $this->width = $width;
12. $this->center = $width / 2;
14. //创建图形对象
15. $this->image = imagecreatetruecolor($this->width, $this->width);
17. //将初始图形填充为白色
18. $color = imagecolorallocate($this->image, $backcolor[0]["r"], $backcolor[0]["g"], $backcolor[0]["b"]);
19. imagefill($this->image, 0, 0, $color);
20. }
22. //设置图形数据
23. public function graphData($data, $colors){
24. $black = imagecolorallocate($this->image, 0x00, 0x00, 0x00);
26. $sum = array_sum($data);
28. $start = -90;
30. for($i=0; $i $color = imagecolorallocate($this->image, $colors[$i]["r"], $colors[$i]["g"], $colors[$i]["b"]);
32. $stop = @($data[$i] / $sum * 360) + $start;
34. imagefilledarc($this->image, $this->center, $this->center,
35. $this->width, $this->width, $start, $stop, $color, IMG_ARC_PIE);
36. imagefilledarc($this->image, $this->center, $this->center,
37. $this->width, $this->width, $start, $stop, $black, IMG_ARC_NOFILL | IMG_ARC_EDGED);
39. $start = $stop;
40. }
41. }
43. //生成图形
44. public function flushImage(){
45. header("Content-type:image/png");
46. imagepng($this->image);
47. }
48. }
49. ?>

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2. include_once 'piechart.cls.php';
4. $total = $_GET["total"];
5. $count = $_GET["count"];
7. $data = array($total-$count,$count);
8. $colors = array(
9. array('r'=>0xDD,'g'=>0xEE,'b'=>0xFF),
10. array('r'=>0xFF,'g'=>0xBB,'b'=>0xAA)
11. );
13. $chart = new PieChart(200,array(array("r"=>0xF9,"g"=>0xF9,"b"=>0xF9)));
14. $chart->graphData($data, $colors);
15. $chart->flushImage();
16. ?>

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