php绘图之饼图

本程序根据txt文件中的数据生成饼图。bt1.txt文件的内容如下：

Chart
a,b,c,d,e,f,g,h
23,22,8,9,12,18,33,34

其中第一行为图标名称，第二行是x轴坐标，第三行为显示的数据。

<?php

header("Content-type: image/png");

$file_name="bt1.txt";
//$input_d=array();
$ChartLabel=array();
$ChartData = array();
$all=array();
$colorSlice=array();

function radians ($degrees)
{
return($degrees * (pi()/180.0));
}

function circle_point($degrees, $diameter)
{
$x = cos(radians($degrees)) * ($diameter/2);
$y = sin(radians($degrees)) * ($diameter/2);

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

//打开文件
$fp=fopen($file_name,"r");    

//将数据转化成数组的格式输出
$all=file($file_name);
$title=substr ( $all[0], 0, strlen($all[0])-2);
$label=substr ( $all[1], 0, strlen($all[1])-2);
//$str=trim(fgets($fp,100));
$ChartLabel=explode(",",$label);
$ChartData=explode(",",$all[2]);
fclose($fp);

// 填充图表的参数
$ChartDiameter = 350; //图表直径
$ChartFont = 2; //
$ChartFontHeight = ImageFontHeight($ChartFont);  
$ChartFontWidth = ImageFontWidth($ChartFont);  

//$ChartData=$input_d;
//$ChartLable=(int)$input_d;

//确定图形的大小
$ChartWidth = $ChartDiameter +400;
$ChartHeight = $ChartDiameter + 20 +(($ChartFontHeight + 2) * count($ChartData));

//确定统计的总数
for($index = 0; $index < count($ChartData); $index++)
{
$ChartTotal += $ChartData[$index];
}

$ChartCenterX = $ChartDiameter/2 + 40;
$ChartCenterY = $ChartDiameter/2 + 60;

//生成空白图形
$image = ImageCreate($ChartWidth, $ChartHeight);

//分配颜色
$colorBody = ImageColorAllocate($image, 255, 255, 255 );
$colorBorder = ImageColorAllocate($image, 255, 100, 0 );
$colorText = ImageColorAllocate($image, 0, 0, 0);

$red=253;
$green=253;
$blue=253;

for($i=0; $i<count($ChartData); $i++)
{
$red=intval(($red+$i*200)%255);
$green=intval(($blue+blue+$i*60)%255);
$blue=intval(($yellow+$i*20)%255);
$colorSlice[$i] = ImageColorAllocate($image,$red,$green,$blue);
}

//填充背境
ImageFill($image, 0, 0, $colorBody);

$Degrees = 0;
for($index = 0; $index < count($ChartData); $index++)
{
$StartDegrees = round($Degrees);
$Degrees += (($ChartData[$index]/$ChartTotal)*360);
$EndDegrees = round($Degrees);

//$CurrentColor = $colorSlice[$index%(count($colorSlice))];
$CurrentColor = $colorSlice[$index];
//画图F
ImageARC($image,$ChartCenterX,$ChartCenterY,$ChartDiameter,
$ChartDiameter,$StartDegrees,$EndDegrees, $CurrentColor);

//画直线
list($ArcX, $ArcY) = circle_point($StartDegrees, $ChartDiameter);
ImageLine($image,$ChartCenterX,$ChartCenterY,floor($ChartCenterX + $ArcX),
floor($ChartCenterY + $ArcY),$CurrentColor);
//画直线
list($ArcX, $ArcY) = circle_point($EndDegrees, $ChartDiameter);
ImageLine($image,$ChartCenterX,$ChartCenterY,ceil($ChartCenterX + $ArcX),
ceil($ChartCenterY + $ArcY),$CurrentColor);

//填充扇形
$MidPoint = round((($EndDegrees - $StartDegrees)/2) + $StartDegrees);
list($ArcX, $ArcY) = circle_point($MidPoint, $ChartDiameter/2);
ImageFillToBorder($image,floor($ChartCenterX + $ArcX),floor($ChartCenterY + $ArcY),
$CurrentColor,$CurrentColor);
}

//画边框
ImageArc($image,
$ChartCenterX,
$ChartCenterY,
$ChartDiameter,
$ChartDiameter,
0,
180,
$colorBorder);

ImageArc($image,
$ChartCenterX,
$ChartCenterY,
$ChartDiameter,
$ChartDiameter,
180,
360,
$colorBorder);

ImageArc($image,
$ChartCenterX,
$ChartCenterY,
$ChartDiameter+7,
$ChartDiameter+7,
0,
180,
$colorBorder);

ImageArc($image,
$ChartCenterX,
$ChartCenterY,
$ChartDiameter+7,
$ChartDiameter+7,
180,
360,
$colorBorder);

ImageFillToBorder($image,
floor($ChartCenterX + ($ChartDiameter/2) + 2),
$ChartCenterY,
$colorBorder,
$colorBorder);

//画图例
$LineX= $ChartDiameter +80;
$NowX=0;
for($index = 0; $index < count($ChartData); $index++)
{
//$CurrentColor = $colorSlice[$index%(count($colorSlice))];
$CurrentColor = $colorSlice[$index];
//$LineY = $ChartDiameter +20+ ($index*($ChartFontHeight+2));
//$LineX= $ChartDiameter +20+ ($index*($ChartFontHeight+40));
//$LineY = $ChartDiameter +80;
//$LineX= $ChartDiameter +40;
$LineY =60+ ($index*($ChartFontHeight+6));
//$LineX=10;
//draw color box
ImageRectangle($image,
$LineX,
$LineY,
$LineX+ $ChartFontHeight,
$LineY+$ChartFontHeight,
$colorBorder);

ImageFillToBorder($image,
$LineX+2,
$LineY + 2,
$colorBorder,
$CurrentColor);

//画标签
ImageString($image,
$ChartFont,
$LineX+20,
$LineY,
"$ChartLabel[$index]:$ChartData[$index]",
$colorText);

//$wid= strlen((string)$ChartData[$index])+strlen($ChartLabel[$index])+1;
//$wid=$wid*8;
//$LineX=$LineX+$wid+10;

ImageString($image,
$ChartFont,
400,
200+($index*($ChartFontHeight+2)),
$wid,
$colorText);

}

ImageRectangle ( $image,
5,
5,
600,
450,
$colorText);

//写标题
ImageString($image,
5,
120,
20,
$title,
$colorText);
//ImageFilledEllipse ( $image, $ChartCenterX+10,$ChartCenterY+10, $ChartDiameter, $ChartDiameter, $colorText);

//输出生成的图片
ImagePNG($image);
ImageDestroy($image);

?>