php 图片处理函数实例教程

2024-09-04 11:44:26

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<?php

//公用函数

//把角度转换为弧度

function deg2Arc($degrees) {

return($degrees * (pi()/180.0));

}

//RGB

function getRGB($color){

  $R=($color>>16) & 0xff;

  $G=($color>>8) & 0xff;

  $B=($color) & 0xff;

  return (array($R,$G,$B));

}

// 取得在椭圆心为（0，0）的椭圆上 x,y点的值

function pie_point($deg,$va,$vb){

$x= cos(deg2Arc($deg)) * $va;

$y= sin(deg2Arc($deg)) * $vb;

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

}

//3D饼图类

class chart{

var $a; //椭圆长半轴

var $b; //椭圆短半轴

var $DataArray;  //每个扇形的数据

var $ColorArray; //每个扇形的颜色要求按照十六进制书写但前面不加0x

//为边缘及阴影为黑色

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]; //算出数据和



    //填充背境

    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

//开源代码Vevb.com

//实现

$objp = new chart();

$objp->DrawPie();

?>