下面关于php 3D饼图类绘制类函数实现原理是根据//椭圆长半轴等参数绘制一个3D饼图形的代码,代码如下:

1. class chart{
2. var $a; //椭圆长半轴
3. var $b; //椭圆短半轴
4. var $DataArray; //每个扇形的数据
5. var $ColorArray; //每个扇形的颜色 要求按照十六进制书写但前面不加0x
6. //为边缘及阴影为黑色
7. function chart($pa=100,$pb=60,$sData="100,200,300,400,500,300", $sColor="ee00ff,dd0000,cccccc,ccff00,00ccff,ccff00")
8. {
9. $this->a=$pa;
10. $this->b=$pb;
11. $this->DataArray=split(",",$sData);
12. $this->ColorArray=split(",",$sColor);
13. }
14. function setA($v){
15. $this->a=$v;
16. }
17. function getA(){
18. return $this->a;
19. }
20. function setB($v){
21. $this->b=$v;
22. }
23. function getB(){
24. return $this->b;
25. }
26. function setDataArray($v){
27. $this->DataArray=split(",",$v);
28. }
29. function getDataArray($v){
30. return $this->DataArray;
31. }
32. function setColorArray($v){
33. $this->ColorArray=split(",",$v);
34. }
35. function getColorArray(){
36. return $this->ColorArray;
37. }
38. function DrawPie(){
39. $image=imagecreate($this->a*2+40,$this->b*2+40);
40. $PieCenterX=$this->a+10;
41. $PieCenterY=$this->b+10;
42. $DoubleA=$this->a*2;
43. $DoubleB=$this->b*2;
44. list($R,$G,$B)=getRGB(0);
45. $colorBorder=imagecolorallocate($image,$R,$G,$B);
46. $DataNumber=count($this->DataArray);
47. //$DataTotal
48. for($i=0;$i<$DataNumber;$i++) $DataTotal+=$this->DataArray[$i]; //算出数据和
49. //填充背境
50. imagefill($image, 0, 0, imagecolorallocate($image, 0xFF, 0xFF, 0xFF));
51. /*
52. ** 画每一个扇形
53. */
54. $Degrees = 0;
55. for($i = 0; $i < $DataNumber; $i++){
56. $StartDegrees = round($Degrees);
57. $Degrees += (($this->DataArray[$i]/$DataTotal)*360);
58. $EndDegrees = round($Degrees);
59. $percent = number_format($this->DataArray[$i]/$DataTotal*100, 1);
60. list($R,$G,$B)=getRGB(hexdec($this->ColorArray[$i]));
61. $CurrentColor=imagecolorallocate($image,$R,$G,$B);
62. if ($R>60 and $R<256) $R=$R-60;
63. if ($G>60 and $G<256) $G=$G-60;
64. if ($B>60 and $B<256) $B=$B-60;
65. $CurrentDarkColor=imagecolorallocate($image,$R,$G,$B);
66. //画扇形弧
67. imagearc($image,$PieCenterX,$PieCenterY,$DoubleA,$DoubleB,$StartDegrees,$EndDegrees,$CurrentColor);
68. //画直线
69. list($ArcX, $ArcY) = pie_point($StartDegrees , $this->a , $this->b);
70. imageline($image,$PieCenterX,$PieCenterY,floor($PieCenterX + $ArcX),floor($PieCenterY + $ArcY),$CurrentColor);
71. //画直线
72. list($ArcX, $ArcY) = pie_point($EndDegrees,$this->a , $this->b);
73. imageline($image,$PieCenterX,$PieCenterY,ceil($PieCenterX + $ArcX),ceil($PieCenterY + $ArcY),$CurrentColor);
74. //填充扇形
75. $MidPoint = round((($EndDegrees - $StartDegrees)/2) + $StartDegrees);
76. list($ArcX, $ArcY) = Pie_point($MidPoint, $this->a*3/4 , $this->b*3/4);
77. imagefilltoborder($image,floor($PieCenterX + $ArcX),floor($PieCenterY + $ArcY), $CurrentColor,$CurrentColor);
78. imagestring($image,2,floor($PieCenterX + $ArcX-5),floor($PieCenterY + $ArcY-5),$percent."%",$colorBorder);
79. //画阴影
80. if ($StartDegrees>=0 and $StartDegrees<=180){
81. if($EndDegrees<=180){
82. for($k = 1; $k < 15; $k++)
83. imagearc($image,$PieCenterX, $PieCenterY+$k,$DoubleA, $DoubleB, $StartDegrees, $EndDegrees, $CurrentDarkColor);
84. }else{
85. for($k = 1; $k < 15; $k++)
86. imagearc($image,$PieCenterX, $PieCenterY+$k,$DoubleA, $DoubleB, $StartDegrees, 180, $CurrentDarkColor);
87. }
88. }
89. }
90. /*到此脚本已经生了一幅图像了
91. **现在需要的是把它发到浏览器上，重要的一点是要将标头发给浏览器，让它知道是一个GIF文件。不然的话你只能看到一堆奇怪的乱码
92. */
93. //输出生成的图片
94. header("Content-type: image/gif");
95. imagegif($image);
96. imagedestroy($image);
97. }//End drawPie()
98. }//End class
99. //开源代码phpfensi.com
100. //实现
101. $objp = new chart();
102. $objp->DrawPie();