imagefilledarc

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. Returns TRUE on success or FALSE on failure. 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'.

Example 1. Creating a 3D looking pie

<?php

// create image
$image = imagecreatetruecolor(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);
?>

Note: This function requires GD 2.0.1 or later.

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