我们在很多网站会看到一些图形的百分比显示图,像三个地区所占地多少或者是成绩等,给大家介绍一款用php生成的扇形比例百分比显示程序代码,不过使用它首先得有phpGD库支持,代码如下:
- <?php
- //填充图表的参数
- $ChartDiameter = 60; //图表直径
- $ChartData = array(30,70);//用于生成图表的数据,可通过数据库来取得来确定也可以多个不过和颜色数组对应
- //把角度转换为弧度
- function radians($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));}
- //确定图形的大小
- $ChartWidth = $ChartDiameter + 20;
- $ChartHeight = $ChartDiameter + 20;
- //确定统计的总数
- $ChartTotal = “”;
- for($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, 0×00, 0×00, 0×00);
- $colorText = imagecolorallocate($image, 0×00, 0×00, 0×00);
- $colorSlice[] = imagecolorallocate($image, 0xFF, 0×00, 0×00);//这里是和你上面写的数组对应的颜色
- $colorSlice[] = imagecolorallocate($image, 0×00, 0xFF, 0×00);
- //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);
- } //Vevb.com
- //到此脚本 已经生了一幅图像的,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
- header(“Content-type: image/png”);
- imagegif($image);
- ?>
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