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# imagefilledarc

(PHP 4 >= 4.0.6, PHP 5)

imagefilledarc -- Draw a partial ellipse and fill it

## Description

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

imagefilledarc() draws a partial ellipse centered at cx, cy (top left is 0, 0) in the image represented by image. 成功回傳`TRUE`失敗回傳`FALSE`。 W and h specifies the ellipse's width and height respectively while the start and end points are specified in degrees indicated by the s and e arguments. style is 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'.

示範 1.Creating a 3D looking pie

`<?php
// this example is provided by poxy at klam dot is
// create image
$image = imagecreate(100, 100);
// allocate some solors
$white = imagecolorallocate($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);
// make the 3D effect
for ($i = 60; $i > 50; $i--) {
imagefilledarc($image, 50, $i, 100, 50, 0, 45, $darknavy, IMG_ARC_PIE);
imagefilledarc($image, 50, $i, 100, 50, 45, 75 , $darkgray, IMG_ARC_PIE);
imagefilledarc($image, 50, $i, 100, 50, 75, 360 , $darkred, IMG_ARC_PIE);
}
imagefilledarc($image, 50, 50, 100, 50, 0, 45, $navy, IMG_ARC_PIE);
imagefilledarc($image, 50, 50, 100, 50, 45, 75 , $gray, IMG_ARC_PIE);
imagefilledarc($image, 50, 50, 100, 50, 75, 360 , $red, IMG_ARC_PIE);
// flush image
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
?>`

> 備注:This function requires GD 2.0.1 or later.

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