function create_image($file_name, $base = '', $height = '', $percent = '', $width = '', $direction = '', $numcolors = '', $color1 = '', $color2 = '')
{
global $DEFAULTS, $MAX_COLORS, $MAX_HEIGHT, $MAX_WIDTH, $MIN_COLORS;
if ($base != '') {
$color1 = $color2 = $base;
}
$color1 = $color1 == '' ? colorToRGB($DEFAULTS['color1']) : (preg_match("/^#?([0-9a-fA-F]{3,6})/", $color1, $matches) ? colorToRGB($matches[1]) : colorToRGB($DEFAULTS['color1']));
$color2 = $color2 == '' ? colorToRGB($DEFAULTS['color2']) : (preg_match("/^#?([0-9a-fA-F]{3,6})/", $color2, $matches) ? colorToRGB($matches[1]) : colorToRGB($DEFAULTS['color2']));
if (empty($height)) {
$height = $DEFAULTS['height'];
}
if ($height > $MAX_HEIGHT) {
$height = $MAX_HEIGHT;
}
if ($direction == '' || $direction % 90 != 0) {
$direction = $DEFAULTS['direction'];
} else {
while ($direction > 360) {
$direction -= 360;
}
}
if ($direction == 90 || $direction == 270) {
// Vertical gradient
if (empty($height)) {
$height = $DEFAULTS['height'];
}
if ($height > $MAX_HEIGHT) {
$height = $MAX_HEIGHT;
}
$width = 1;
} else {
// Horizontal gradient
if (empty($width)) {
$width = $DEFAULTS['width'];
}
if ($width > $MAX_WIDTH) {
$width = $MAX_WIDTH;
}
$height = 1;
}
if (empty($numcolors)) {
$numcolors = $DEFAULTS['colors'];
} else {
if (preg_match('/^\\d+$/', $numcolors)) {
if ($numcolors < $MIN_COLORS) {
$numcolors = $MIN_COLORS;
} else {
if ($numcolors > $MAX_COLORS) {
$numcolors = $MAX_COLORS;
}
}
} else {
$numcolors = $DEFAULTS['colors'];
}
}
if ($percent == '' || $percent < 0 || $percent > 100) {
$percent = $DEFAULTS['percent'];
}
$percent *= 2.55;
$color2['red'] = min($color2['red'] + $percent, 255);
$color2['green'] = min($color2['green'] + $percent, 255);
$color2['blue'] = min($color2['blue'] + $percent, 255);
$image = imagecreate($width, $height);
// Allocate array of colors
$colors = array();
$deltared = $color2['red'] - $color1['red'];
$deltagreen = $color2['green'] - $color1['green'];
$deltablue = $color2['blue'] - $color1['blue'];
$tmp_c = $numcolors - 1;
for ($i = 0; $i < $numcolors; $i++) {
$thisred = floor(min($color1['red'] + $deltared * $i / $tmp_c, 255));
$thisgreen = floor(min($color1['green'] + $deltagreen * $i / $tmp_c, 255));
$thisblue = floor(min($color1['blue'] + $deltablue * $i / $tmp_c, 255));
$colors[$i] = imagecolorallocate($image, $thisred, $thisgreen, $thisblue);
}
$dim = $width;
$dx = $dy = $i = $x1 = $y1 = 0;
$x2 = $width - 1;
$y2 = $height - 1;
switch ($direction) {
case 0:
$dx = 1;
$x2 = 0;
break;
case 90:
$dim = $height;
$dy = -1;
$y1 = $height - 1;
break;
case 180:
$dx = -1;
$x1 = $width - 1;
break;
case 270:
$dim = $height;
$dy = 1;
$y2 = 0;
break;
}
while ($x1 >= 0 && $x1 < $width && $x2 >= 0 && $x2 < $width && $y1 >= 0 && $y1 < $height && $y2 >= 0 && $y2 < $height) {
// Which color for this line?
$ind = floor($numcolors * $i / $dim);
if ($ind >= $numcolors) {
$ind = $numcolors;
}
imageline($image, $x1, $y1, $x2, $y2, $colors[$ind]);
$x1 += $dx;
$y1 += $dy;
$x2 += $dx;
$y2 += $dy;
$i++;
}
if (function_exists('imagepng')) {
if ($file_name == '') {
header('Content-type: image/png');
imagepng($image);
} else {
imagepng($image, $file_name);
}
} elseif (function_exists('imagegif')) {
if ($file_name == '') {
header('Content-type: image/gif');
imagegif($image);
} else {
imagegif($image, $file_name);
}
} else {
echo 'No image formats supported!<br />' . "\n";
}
imagedestroy($image);
return;
}
} else {
if (preg_match("/^#?([0-9a-fA-F]{3,6})/", $color1, $matches)) {
$color1 = colorToRGB($matches[1]);
} else {
$color1 = colorToRGB($DEFAULTS['color1']);
}
}
if ($base === null) {
$color2 = getGetValue('color2');
if ($color2 === null) {
$color2 = colorToRGB($DEFAULTS['color2']);
} else {
if (preg_match("/^#?([0-9a-fA-F]{3,6})/", $color2, $matches)) {
$color2 = colorToRGB($matches[1]);
} else {
$color2 = colorToRGB($DEFAULTS['color2']);
}
}
} else {
$color2 = $color1;
$percent = getGetValue('percent');
if ($percent === null || $percent < 0 || $percent > 100) {
$percent = $DEFAULTS['percent'];
}
$color2['red'] = min($color2['red'] + $percent * 255 / 100, 255);
$color2['green'] = min($color2['green'] + $percent * 255 / 100, 255);
$color2['blue'] = min($color2['blue'] + $percent * 255 / 100, 255);
}
$image = imagecreate($width, $height);
// Allocate array of colors
$colors = array();
