PHP 3D pie chart drawing function_PHP tutorial-PHP Tutorial-php.cn

PHP 3D pie chart drawing function_PHP tutorial

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Release： 2016-07-13 10:45:16

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The implementation principle of the php 3D pie chart drawing function below is the code to draw a 3D pie graphic based on parameters such as the // major semiaxis of the ellipse.

The following is a PHP tutorial. The implementation principle of the 3D pie chart drawing function is to draw a 3D pie graphic based on parameters such as the // major semiaxis of the ellipse.

class chart{

var $a; //Ellipse semi-major axis
var $b; //Minor semi-axis of ellipse
var $DataArray; //Data for each sector
var $ColorArray; //The color of each sector must be written in hexadecimal without adding 0x in front
//The edges and shadows are black

function chart($pa=100,$pb=60,$sData="100,200,300,400,500,300", $sColor="ee00ff,dd0000,cccccc,ccff00,00ccff,ccff00")
{
$this->a=$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]; //Calculate the sum of data

//Fill the background
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 chart();
$objp->DrawPie();