在php中怎么画直方图和饼图？

Question

http://developer.netscape.com/docs/technote/javascript/graph/http://www.csdn.net/Develop/read_article.asp?id=14387

Answer 1

为什么用 imagepng()函数输出的是乱码

Answer 2

问题解决了<? 
 Header("Content-type: image/jpeg");/*
把角度转换为弧度
*/
function radians ($degrees) 
{
return($degrees * (pi()/180.0));
}
/*
** 取得在圆心为（0，0）圆上 x,y点的值
*/
function circle_point($degrees, $diameter) 
{
$x = cos(radians($degrees)) * ($diameter/2);
$y = sin(radians($degrees)) * ($diameter/2);return (array($x, $y));
}
function   draw($num1,$num2,$num3){
// 填充图表的参数
$ChartDiameter = 200; //图表直径
$ChartFont = 2; //图表字体
$ChartFontHeight = imagefontheight($ChartFont);//图表字体的大小
$ChartData = array( "$num1","$num2","$num3");//用于生成图表的数据，可通过数据库来取得来确定
//$ChartLabel = array("yes", "no"); //数据对应的名称//确定图形的大小
$ChartWidth = $ChartDiameter + 20;
$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 + 10;
$ChartCenterY = $ChartDiameter/2 + 10;
//生成空白图形
$image = imagecreate($ChartWidth, $ChartHeight);//分配颜色
$colorBody = imagecolorallocate($image, 0xFF, 0xFF, 0xFF);
$colorBorder = imagecolorallocate($image, 0x00, 0x00, 0x00);
$colorText = imagecolorallocate($image, 0x00, 0x00, 0x00);
$colorSlice[] = imagecolorallocate($image, 0x00, 0xFF, 0x00);
$colorSlice[] = imagecolorallocate($image, 0x00, 0x00, 0xff);
$colorSlice[] = imagecolorallocate($image, 0xff, 0x00, 0x00);
//填充背境
imagefill($image, 0, 0, $colorBody);
/*
** 画每一个扇形
*/
$Degrees = 0;
for($index = 0; $index < count($ChartData); $index++)
{
$StartDegrees = round($Degrees);
$Degrees += (($ChartData[$index]/$ChartTotal)*360);
$EndDegrees = round($Degrees);$CurrentColor = $colorSlice[$index%(count($colorSlice))];//画图F
imagearc($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, 
$colorBorder);
//画图例
for($index = 0; $index < count($ChartData); $index++)
{
$CurrentColor = $colorSlice[$index%(count($colorSlice))];
$LineY = $ChartDiameter + 20 + ($index*($ChartFontHeight+2));//draw color box
imagerectangle($image, 
10, 
$LineY, 
10 + $ChartFontHeight, 
$LineY+$ChartFontHeight, 
$colorBorder);imagefilltoborder($image, 
12,
$LineY + 2, 
$colorBorder,
$CurrentColor);//画标签
imagestring($image,
$ChartFont,
20 + $ChartFontHeight,
$LineY, 
"$ChartLabel[$index]:$ChartData[$index]",
$colorText);
}
 imagejpeg($image); 
}
 draw(34,234,435);
?>