<?PHP
/*
clock2.php
Generates an analog clock png from the current time
on a transparent background
*/
// Step 1. Create a new blank image
$im = imageCreate(101, 101);
// Step 2. Add Content
// begin by defining the colors used in the image
// this time, the first color defined will become transparent
$background = imageColorAllocate ($im, 0, 0, 0);
$background = imageColorTransparent($im,$background);
$nyphpPurp = imageColorAllocate ($im, 0x70, 0x6D, 0x85);
$nyphpBlue = imageColorAllocate ($im, 0x1A, 0x1A, 0x73);
$nyphpGrey = imageColorAllocate ($im, 0xDD, 0xDD, 0xDD);
// then use those colors to draw a series of overlapping circles
imageFilledEllipse ($im, 50, 50, 100, 100, $nyphpBlue);
imageFilledEllipse ($im, 50, 50, 90, 90, $nyphpPurp);
imageFilledEllipse ($im, 50, 50, 75, 75, $nyphpGrey);
// for the hands, calculate the degrees for arc from current time
$hd = imgDegreesFromTime('hour') ;
$md = imgDegreesFromTime('minute') ;
$sd = imgDegreesFromTime('second') ;
// draw the hands using degrees calculated above with small offsets
imageFilledArc ($im, 50, 50, 52, 52, $hd-6, $hd+6, $nyphpPurp, IMG_ARC_PIE);
imageFilledArc ($im, 50, 50, 65, 65, $md-3, $md+2, $nyphpPurp, IMG_ARC_PIE);
imageFilledArc ($im, 50, 50, 70, 70, $sd-2, $sd+1, $nyphpBlue, IMG_ARC_PIE);
// add a final small dot on top
imageFilledEllipse ($im, 50, 50, 5, 5, $nyphpPurp);
// Steps 3-5. Send headers, image data, & destroy image
header ('Refresh: 1; URL='.$_SERVER['PHP_SELF']);
header('Content-type: image/png');
imagePNG ($im);
imageDestroy ($im);
/**
* @param $kind string 'hour', 'minute' or 'second'
* @return int calculated degrees w/ 0 at 3 o'clock
* @desc converts the hour, minute or second to 360¼ value
* shifted to 3 o'clock for use in GD image functions
*/
function imgDegreesFromTime($kind) {
switch ($kind) {
case 'hour' :
return ((date('g') * 30) + 270) % 360 ; // 30 = 360 / 12 hours
case 'minute' :
return ((date('i') * 6) + 270) % 360 ; // 6 = 360 / 60 minutes
case 'second' :
return ((date('s') * 6) + 270) % 360 ; // 6 = 360 / 60 seconds
}
}
?>
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