php生成扇形比例圖實例

2024-09-04 11:46:56

字體：大中小

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我們在很多網站會看到一些圖形的百分比顯示圖，像三個地區所占地多少或者是成績等，給大家介紹一款用php生成的扇形比例百分比顯示程序代碼，不過使用它首先得有phpGD庫支持，代碼如下:

<?php

//填充圖表的參數

$ChartDiameter = 60; //圖表直徑

$ChartData = array(30,70);//用于生成圖表的數據，可通過數據庫來取得來確定也可以多個不過和顏色數組對應

//把角度轉換為弧度

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

//取得在圓心為（0，0）圓上 x,y點的值

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

//確定圖形的大小

$ChartWidth = $ChartDiameter + 20;

$ChartHeight = $ChartDiameter + 20;

//確定統計的總數

$ChartTotal = “”;

for($index = 0;$index < count($ChartData);$index++){

$ChartTotal += $ChartData[$index];

}

$ChartCenterX = $ChartDiameter/2 + 10;

$ChartCenterY = $ChartDiameter/2 + 10;

//生成空白圖形

$image = imagecreate($ChartWidth, $ChartHeight);

//分配顏色

$colorBody = imagecolorallocate($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);//這里是和你上面寫的數組對應的顏色

$colorSlice[] = imagecolorallocate($image, 0×00, 0xFF, 0×00);

//填充背境

imagefill($image, 0, 0, $colorBody);

//畫每一個扇形

$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))];

//畫圖F

imagearc($image,$ChartCenterX,$ChartCenterY,$ChartDiameter,$ChartDiameter,$StartDegrees,$EndDegrees, $CurrentColor);

//畫直線

list($ArcX, $ArcY) = circle_point($StartDegrees, $ChartDiameter);

imageline($image,$ChartCenterX,$ChartCenterY,floor($ChartCenterX + $ArcX),

floor($ChartCenterY + $ArcY),$CurrentColor);

//畫直線

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

//到此腳本已經生了一幅圖像的，現在需要的是把它發到瀏覽器上，重要的一點是要將標頭發給瀏覽器，讓它知道是一個GIF文件。不然的話你只能看到一堆奇怪的亂碼

header(“Content-type: image/png”);

imagegif($image);

?>