GD and Image 函数
PHP Manual

imagefilledarc

(PHP 4 >= 4.0.6, PHP 5)

imagefilledarc画一椭圆弧且填充

说明

bool imagefilledarc ( resource $image , int $cx , int $cy , int $w , int $h , int $s , int $e , int $color , int $style )

imagefilledarc()image 所代表的图像中以 cxcy(图像左上角为 0, 0)画一椭圆弧。成功时返回 TRUE, 或者在失败时返回 FALSE.wh 分别指定了椭圆的宽和高,se 参数以角度指定了起始和结束点。style 可以是下列值按位或(OR)后的值:

  1. IMG_ARC_PIE
  2. IMG_ARC_CHORD
  3. IMG_ARC_NOFILL
  4. IMG_ARC_EDGED
IMG_ARC_PIEIMG_ARC_CHORD 是互斥的;IMG_ARC_CHORD 只是用直线连接了起始和结束点,IMG_ARC_PIE 则产生圆形边界(如果两个都用,IMG_ARC_CHORD 生效)。IMG_ARC_NOFILL 指明弧或弦只有轮廓,不填充。IMG_ARC_EDGED 指明用直线将起始和结束点与中心点相连,和 IMG_ARC_NOFILL 一起使用是画饼状图轮廓的好方法(而不用填充)。

Example #1 创建一 3D 效果的饼状图

<?php
// create image
$image imagecreatetruecolor(100100);

// allocate some solors
$white    imagecolorallocate($image0xFF0xFF0xFF);
$gray     imagecolorallocate($image0xC00xC00xC0);
$darkgray imagecolorallocate($image0x900x900x90);
$navy     imagecolorallocate($image0x000x000x80);
$darknavy imagecolorallocate($image0x000x000x50);
$red      imagecolorallocate($image0xFF0x000x00);
$darkred  imagecolorallocate($image0x900x000x00);

// make the 3D effect
for ($i 60$i 50$i--) {
  
imagefilledarc($image50$i10050045$darknavyIMG_ARC_PIE);
  
imagefilledarc($image50$i100504575 $darkgrayIMG_ARC_PIE);
  
imagefilledarc($image50$i1005075360 $darkredIMG_ARC_PIE);
}

imagefilledarc($image505010050045$navyIMG_ARC_PIE);
imagefilledarc($image5050100504575 $grayIMG_ARC_PIE);
imagefilledarc($image50501005075360 $redIMG_ARC_PIE);


// flush image
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
?>

Note: 此函数需要 GD 2.0.1 或更高版本(推荐 2.0.28 及更高版本)。

参数

image

由图象创建函数(例如 imagecreatetruecolor())返回的图象资源。

cx

x-coordinate of the center.

cy

y-coordinate of the center.

width

The arc width.

height

The arc height.

start

The arc start angle, in degrees.

end

The arc end angle, in degrees. 0° is located at the three-o'clock position, and the arc is drawn clockwise.

color

A color identifier created with imagecolorallocate().

style

A bitwise OR of the following possibilities:

  1. IMG_ARC_PIE
  2. IMG_ARC_CHORD
  3. IMG_ARC_NOFILL
  4. IMG_ARC_EDGED
IMG_ARC_PIE and IMG_ARC_CHORD are mutually exclusive; IMG_ARC_CHORD just connects the starting and ending angles with a straight line, while IMG_ARC_PIE produces a rounded edge. IMG_ARC_NOFILL indicates that the arc or chord should be outlined, not filled. IMG_ARC_EDGED, used together with IMG_ARC_NOFILL, indicates that the beginning and ending angles should be connected to the center - this is a good way to outline (rather than fill) a 'pie slice'.

返回值

成功时返回 TRUE, 或者在失败时返回 FALSE.

范例

Example #2 Creating a 3D looking pie

<?php

// create image
$image imagecreatetruecolor(100100);

// allocate some colors
$white    imagecolorallocate($image0xFF0xFF0xFF);
$gray     imagecolorallocate($image0xC00xC00xC0);
$darkgray imagecolorallocate($image0x900x900x90);
$navy     imagecolorallocate($image0x000x000x80);
$darknavy imagecolorallocate($image0x000x000x50);
$red      imagecolorallocate($image0xFF0x000x00);
$darkred  imagecolorallocate($image0x900x000x00);

// make the 3D effect
for ($i 60$i 50$i--) {
   
imagefilledarc($image50$i10050045$darknavyIMG_ARC_PIE);
   
imagefilledarc($image50$i100504575 $darkgrayIMG_ARC_PIE);
   
imagefilledarc($image50$i1005075360 $darkredIMG_ARC_PIE);
}

imagefilledarc($image505010050045$navyIMG_ARC_PIE);
imagefilledarc($image5050100504575 $grayIMG_ARC_PIE);
imagefilledarc($image50501005075360 $redIMG_ARC_PIE);


// flush image
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
?>

以上例程的输出类似于:

Output of example : Creating a 3D looking pie

注释

Note: 此函数需要 GD 2.0.1 或更高版本(推荐 2.0.28 及更高版本)。


GD and Image 函数
PHP Manual