useful recursive PHP functions

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PHP Manual for

imagefilledarc

(PHP 4 >= 4.0.6)

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:

  • 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'.

    Example 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);
    ?>

    Note: This function was added in PHP 4.0.6 and requires GD 2.0.1

    © 2012 lixlpixel