PHP对象编程实现3D饼图-PHP教程,PHP应用

<?php

//公用函数

//把角度转换为弧度

function deg2arc($degrees) {

return($degrees * (pi()/180.0));

}

//rgb

function getrgb($color){

$r=($color>>16) & 0xff;

$g=($color>>8) & 0xff;

$b=($color) & 0xff;

return (array($r,$g,$b));

}

// 取得在椭圆心为（0，0）的椭圆上 x,y点的值

function pie_point($deg,$va,$vb){

$x= cos(deg2arc($deg)) * $va;

$y= sin(deg2arc($deg)) * $vb;

return (array($x, $y));

}

//3d饼图类

class pie3d{

var $a; //椭圆长半轴

var $b; //椭圆短半轴

var $dataarray; //每个扇形的数据

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

//为边缘及阴影为黑色

function pie3d($pa=100,$pb=60,$sdata="100,200,300,400,500", $scolor="ee00ff,dd0000,cccccc,ccff00,00ccff")

{

$this->a=$pa;

$this->b=$pb;

$this->dataarray=split(",",$sdata);

$this->colorarray=split(",",$scolor);

}

function seta($v){

$this->a=$v;

}

function geta(){

return $this->a;

}

function setb($v){

$this->b=$v;

}

function getb(){

return $this->b;

}

function setdataarray($v){

$this->dataarray=split(",",$v);

}

function getdataarray($v){

return $this->dataarray;

}

function setcolorarray($v){

$this->colorarray=split(",",$v);

}

function getcolorarray(){

return $this->colorarray;

}

function drawpie(){

$image=imagecreate($this->a*2+40,$this->b*2+40);

$piecenterx=$this->a+10;

$piecentery=$this->b+10;

$doublea=$this->a*2;

$doubleb=$this->b*2;

list($r,$g,$b)=getrgb(0);

$colorborder=imagecolorallocate($image,$r,$g,$b);

$datanumber=count($this->dataarray);

//$datatotal

for($i=0;$i<$datanumber;$i++) $datatotal+=$this->dataarray[$i]; //算出数据和

//填充背境

imagefill($image, 0, 0, imagecolorallocate($image, 0xff, 0xff, 0xff));

/*

** 画每一个扇形

*/

$degrees = 0;

for($i = 0; $i < $datanumber; $i++){

$startdegrees = round($degrees);

$degrees += (($this->dataarray[$i]/$datatotal)*360);

$enddegrees = round($degrees);

$percent = number_format($this->dataarray[$i]/$datatotal*100, 1);

list($r,$g,$b)=getrgb(hexdec($this->colorarray[$i]));

$currentcolor=imagecolorallocate($image,$r,$g,$b);

if ($r>60 and $r<256) $r=$r-60;

if ($g>60 and $g<256) $g=$g-60;

if ($b>60 and $b<256) $b=$b-60;

$currentdarkcolor=imagecolorallocate($image,$r,$g,$b);

//画扇形弧

imagearc($image,$piecenterx,$piecentery,$doublea,$doubleb,$startdegrees,$enddegrees,$currentcolor);

//画直线

list($arcx, $arcy) = pie_point($startdegrees , $this->a , $this->b);

imageline($image,$piecenterx,$piecentery,floor($piecenterx + $arcx),floor($piecentery + $arcy),$currentcolor);

//画直线

list($arcx, $arcy) = pie_point($enddegrees,$this->a , $this->b);

imageline($image,$piecenterx,$piecentery,ceil($piecenterx + $arcx),ceil($piecentery + $arcy),$currentcolor);

//填充扇形

$midpoint = round((($enddegrees – $startdegrees)/2) + $startdegrees);

list($arcx, $arcy) = pie_point($midpoint, $this->a*3/4 , $this->b*3/4);

imagefilltoborder($image,floor($piecenterx + $arcx),floor($piecentery + $arcy), $currentcolor,$currentcolor);

imagestring($image,2,floor($piecenterx + $arcx-5),floor($piecentery + $arcy-5),$percent."%",$colorborder);

//画阴影

if ($startdegrees>=0 and $startdegrees<=180){

if($enddegrees<=180){

for($k = 1; $k < 15; $k++)

imagearc($image,$piecenterx, $piecentery+$k,$doublea, $doubleb, $startdegrees, $enddegrees, $currentdarkcolor);

}else{

for($k = 1; $k < 15; $k++)

imagearc($image,$piecenterx, $piecentery+$k,$doublea, $doubleb, $startdegrees, 180, $currentdarkcolor);

}

}

}

/*到此脚本已经生了一幅图像了

**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

*/

//输出生成的图片

header("content-type: image/gif");

imagegif($image);

imagedestroy($image);

}//end drawpie()

}//end class

//实现

$objp = new pie3d();

$objp->drawpie();

?>