PHP Manual: Draw a partial arc and fill it

Description

bool imagefilledarc(
    GdImage $image,
    int $center_x,
    int $center_y,
    int $width,
    int $height,
    int $start_angle,
    int $end_angle,
    int $color,
    int $style
)

Draws a partial arc centered at the specified coordinate in the given image.

Parameters

image

A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor.

center_x

x-coordinate of the center.

center_y

y-coordinate of the center.

width

The arc width.

height

The arc height.

start_angle

The arc start angle, in degrees.

end_angle

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:

IMG_ARC_PIE
IMG_ARC_CHORD
IMG_ARC_NOFILL
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'.

Return Values

Returns true on success or false on failure.

Changelog

Version	Description
8.0.0	`image` expects a GdImage instance now; previously, a valid `gd` resource was expected.

Examples

Example #1 Creating a 3D looking pie

<?php

// create image
$image = imagecreatetruecolor(100, 100);

// allocate some colors
$white    = imagecolorallocate($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);
?>

The above example will output something similar to:

Output of example : Creating a 3D looking pie