PHP实现绘制3D扇形统计图及图片缩放实例

1、利用php gd库的函数绘制3D 扇形统计图

<?php

header("content-type","text/html;charset=utf-8");

/*扇形统计图*/

$image = imagecreatetruecolor(100, 100); /*创建画布*/

/*设置画布需要的颜色*/

$white = imagecolorallocate($image,0xff,0xff,0xff);

$gray = imagecolorallocate($image, 0xc0, 0xc0, 0xc0);

$darkgray = imagecolorallocate($image, 0x90, 0x90, 0x90);

$navy = imagecolorallocate($image, 0x00, 0x00, 0x80);

$darknavy = imagecolorallocate($image, 0x00, 0x00, 0x50);

$red = imagecolorallocate($image, 0xff, 0x00, 0x00);

$darkred = imagecolorallocate($image, 0x90, 0x00, 0x00);

/*填充背景色*/

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

/*3D制作*/

for($i = 60; $i > 50; $i--)

{

imagefilledarc($image, 50, $i, 100, 50, -160, 40, $darknavy, IMG_ARC_PIE);

imagefilledarc($image, 50, $i, 100, 50, 40, 75, $darkgray, IMG_ARC_PIE);

imagefilledarc($image, 50, $i, 100, 50, 75, 200, $darkred, IMG_ARC_PIE);

}

/*画椭圆弧并填充*/

imagefilledarc($image, 50, 50, 100, 50, -160, 40, $darknavy, IMG_ARC_PIE);

imagefilledarc($image, 50, 50, 100, 50, 40, 75, $darkgray, IMG_ARC_PIE);

imagefilledarc($image, 50, 50, 100, 50, 75, 200, $darkred, IMG_ARC_PIE);

/*画字符串*/

imagestring($image, 3, 15, 55, "30%", $white);

imagestring($image, 3, 45, 35, "60%", $white);

imagestring($image, 3, 60, 60, "10%", $white);

/*输出图像*/

header("content-type:image/png");

imagepng($image);

/*释放资源*/

imagedestroy($image);

?>

效果：

2、对图片进行缩放