php 图片处理函数实例教程
<?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
//实现
$objp = new chart();
$objp->DrawPie();本文地址:http://www.phprm.com/tuxiang/fs4500.html
转载随意,但请附上文章地址:-)