imageellipse
Using imagefill with alpha colors in a png file does not allow for blending the filling with the original image. On the other hand, substituting imagefill with imagefilledrectangle in order to fill with alpha colors is only helpful when a rectangle shape is desired. This example shows how to imagefill with alpha color or alpha tile images allowing the existing background of the original image to come through, and yet filling only the area with the same color surrounding the filling start point.
<?php
$fillstartx = 30;
$fillstarty = 80;
$r = 180;
$g = 200;
$b = 60;
$alpha = 80;
$tileimage = null;
$mainimage = imagecreatefrompng("myimage.png");
$intermediateimage = imagecreatefrompng("myimage.png"); //intermediate copy
$imagewidth = imagesx($mainimage);
$imageheight = imagesy($mainimage);
/* $tileimage = imagecreatefrompng("tile.png"); //FOR TILE IMAGEFILL */
if ($tileimage) {
imagesettile($intermediateimage, $tileimage);
$color = IMG_COLOR_TILED;
}
else $color = imagecolorallocatealpha($intermediateimage, $r, $g, $b, $alpha);
imagealphablending($intermediateimage, false);
imagefill($intermediateimage, $fillstartx, $fillstarty, $color);
imagesettile($mainimage, $intermediateimage); //set the filled copy as a tile to the main image
imagealphablending($mainimage, true);
imagefilledrectangle($mainimage, 0, 0, $imagewidth, $imageheight, IMG_COLOR_TILED); //apply the tile copy on top of the original
imagealphablending($mainimage, false);
imagesavealpha($mainimage, true);
imagepng($mainimage, "myimage.png", 0);
imagedestroy($intermediateimage);
imagedestroy($mainimage);
?>
imagefill
(PHP 4, PHP 5)
imagefill — Füllen mit Farbe ("flood fill")
Beschreibung:
int imagefill
( resource
$im
, int $x
, int $y
, int $col
)
ImageFill() bewirkt das Füllen eines Bildes
beginnend bei der Koordinate x,
y (oben links ist 0, 0) mit der Farbe
col im Bild im.
add a note
User Contributed Notes
imagefill
Eduard Resina
22-Jan-2011 07:12
Christopher Kramer
06-Oct-2009 03:00
Here is a function to generate a gradient.
You specify width, heigth and 4 colors (of the 4 corners).
An image handle of the gradient image will be returned.
You can copy the returned image onto another image using imageecopy.
This can be helpful if you want to generate a shadow for example.
("Glow effect example": Generate 8 gradients, one for each side and one for each corner. The outer side of the gradients have the background color and the inner sides have a bright color such as white.)
But beware: This function is not optimized for performance, it might become slow on big images. For shadows, better cache the generated gradients.
Note: For gradients, using true-color is highly recommended.
<?php
function gradient($w=100, $h=100, $c=array('#FFFFFF','#FF0000','#00FF00','#0000FF'), $hex=true) {
/*
Generates a gradient image
Author: Christopher Kramer
Parameters:
w: width in px
h: height in px
c: color-array with 4 elements:
$c[0]: top left color
$c[1]: top right color
$c[2]: bottom left color
$c[3]: bottom right color
if $hex is true (default), colors are hex-strings like '#FFFFFF' (NOT '#FFF')
if $hex is false, a color is an array of 3 elements which are the rgb-values, e.g.:
$c[0]=array(0,255,255);
*/
$im=imagecreatetruecolor($w,$h);
if($hex) { // convert hex-values to rgb
for($i=0;$i<=3;$i++) {
$c[$i]=hex2rgb($c[$i]);
}
}
$rgb=$c[0]; // start with top left color
for($x=0;$x<=$w;$x++) { // loop columns
for($y=0;$y<=$h;$y++) { // loop rows
// set pixel color
$col=imagecolorallocate($im,$rgb[0],$rgb[1],$rgb[2]);
imagesetpixel($im,$x-1,$y-1,$col);
// calculate new color
for($i=0;$i<=2;$i++) {
$rgb[$i]=
$c[0][$i]*(($w-$x)*($h-$y)/($w*$h)) +
$c[1][$i]*($x *($h-$y)/($w*$h)) +
$c[2][$i]*(($w-$x)*$y /($w*$h)) +
$c[3][$i]*($x *$y /($w*$h));
}
}
}
return $im;
}
function hex2rgb($hex)
{
$rgb[0]=hexdec(substr($hex,1,2));
$rgb[1]=hexdec(substr($hex,3,2));
$rgb[2]=hexdec(substr($hex,5,2));
return($rgb);
}
// usage example
$image=gradient(300, 300, array('#000000', '#FFFFFF', '#FF0000', '#0000FF'));
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
?>
dunhamzzz [A] gmail
01-Sep-2008 08:36
I feel its worth pointing out that you cannot fill a transparent colour that you have assigned with imagecolorallocatealpha, the colour will fill, but without its transparency,
I find the easiest method around this is to just fill a rectangle using imagefilledrectangle() to draw a fill instead.
daniel_nocturnal at hotmail dot com
07-Jul-2008 07:27
I've used razonklnbd's example, I had to fill an image with a background pattern from an image (file). So I put the code to pieces and come up with a lighter version that suited me, all thanks to razonklnbd.
My version receives three parameters, $image, $width, $height.
$image = The background pattern image
$width = Width of the new image
$height = Height of the new image
<?php
function imagefillfromfile($image, $width, $height) {
$imageWidth = imagesx($image);
$imageHeight = imagesy($image);
$newImage = imagecreatetruecolor($width, $height);
for ($imageX = 0; $imageX < $width; $imageX += $imageWidth) {
for ($imageY = 0; $imageY < $height; $imageY += $imageHeight) {
imagecopy($newImage, $image, $imageX, $imageY, 0, 0, $imageWidth, $imageHeight);
}
}
return($newImage);
imagedestroy($newImage);
}
?>
This function returns a new image with a filled canvas of an image (file) with a fixed width/height.
Example usage:
<?php
$pattern = imagecreatefrompng('pattern.png');
$image = imagefillfromfile($pattern, 400, 300);
imagepng($image);
imagedestroy($image);
imagedestroy($pattern);
?>
Cypog
17-Mar-2008 07:27
imagefill can't deal with alpha colors, use imagefilledrectangle instead.
<?php
header("Content-Type: image/png");
$im = imagecreatefrompng("img/button.png");
if (empty($_GET['alpha']))
{$_GET['alpha'] = 10;}
$color = imagecolorallocatealpha($im, 255, 255, 255, $_GET['alpha']);
imagefillalpha($im, $color);
imagepng($im);
imagedestroy($im);
function ImageFillAlpha($image, $color)
{
imagefilledrectangle($image, 0, 0, imagesx($image), imagesy($image), $color);
}
?>
info at educar dot pro dot br
09-Mar-2007 07:54
Example 1
The filled region will be external to a demarcated region, if the initial coordinates will be outside of this region.
<?php
$src621 = imagecreate(200,200);
$clr_1_621 = imagecolorallocate($src621, 255, 255, 0);
$clr_2_621 = imagecolorallocate($src621, 0, 0, 250);
$clr_4_621 = imagecolorallocate($src621, 2,2,55);
imagerectangle($src621, 100, 100, 150, 150, $clr_4_621);
imagefill($src621, 110, 110, $clr_2_621);
header("Content-Type: image/png");
imagepng ($src621);
imagedestroy($src621);
?>
Example 2
The filled region will be internal to a demarcated region, if the initial coordinates will be inside of this region.
<?php
$src622 = imagecreate(200,200);
$clr_1_622 = imagecolorallocate($src622, 255, 255, 0);
$clr_2_622 = imagecolorallocate($src622, 0, 0, 250);
$clr_4_622 = imagecolorallocate($src622, 2,2,55);
imagerectangle($src622, 100, 100, 150, 150, $clr_4_622);
imagefill($src622, 10, 10, $clr_2_622);
header("Content-Type: image/png");
imagepng ($src622);
imagedestroy($src622);
?>
See another examples at:
http://www.educar.pro.br/a/gdlib/index.php?pn=50&tr=97
Gromitt
06-Mar-2007 10:14
If you need to fill a whole image (immediatly after its creation for instance), consider applying a filled rectangle instead, using imagefilledrectangle() :
<?php
$gdImage = imagecreatetruecolor(100, 100);
$gdColor = imagecolorallocate($gdImage, 255, 0, 0); // red
imagefilledrectangle($gdImage, 0, 0, 99, 99, $gdColor);
?>
which will require much less logic and processing from GD.
razonklnbd at yahoo dot com
24-Sep-2006 03:32
I spend more then two hour to find a function that can fill a pattern or file as background instead of color. but i can't find. so i develop the following function. i though this function will save time who need it...
Function will get four parameter
1. Main Image Identifier
2. Pattern Image Identifier
3. Final Image Width
4. Final Image Height
If you set final image width or height is less then main image width or height then you may get wrong result
<?php
function fill_with_patternfile($p_main_im, $p_patternfile_im, $p_width, $p_height){
$pimiX=$p_patternfile_im;
$pw=imagesx($pimiX);
$ph=imagesy($pimiX);
$targetImageIdentifier=imagecreatetruecolor($p_width,$p_height);
if($pw<$p_width && $ph<$p_height){
for($pX=0;$pX<$p_width;$pX+=$pw){
for($pY=0;$pY<$p_height;$pY+=$ph){
imagecopy($targetImageIdentifier,$pimiX,$pX,$pY,0,0,$pw,$ph);
}
}
}else imagecopy($targetImageIdentifier,$pimiX,0,0,0,0,$pw,$ph);
$w=imagesx($p_main_im);
$h=imagesy($p_main_im);
$nX=0;
if($w<$p_width) $nX=intval(($p_width-$w)/2);
$nY=0;
if($h<$p_height) $nY=intval(($p_height-$h)/2);
imagecopy($targetImageIdentifier,$p_main_im,$nX,$nY,0,0,$w,$h);
return $targetImageIdentifier;
}
// If you want to use a gif or png file as
// pattern file you need to change function below :)
$pattern_im=imagecreatefromjpeg('logo.jpg');
// If you want to use a gif or png file as
// main file you need to change function below :)
$main_im=imagecreatefromjpeg('r2.jpg');
// call the function width 500 and height 500
// if your width and height is less then main images
// width and height then you can't understand any change!
$final=fill_with_patternfile($main_im, $pattern_im, 500, 500);
// view the image and destroy all instance
header('Content-type: image/jpeg');
imagejpeg($final);
imagedestroy($final);
imagedestroy($main_im);
imagedestroy($pattern_im);
exit();
?>
jonathan dot aquino at gmail dot com
08-Jun-2006 03:12
Use imageSaveAlpha($image, true); to preserve transparency.
gelak
29-Nov-2005 11:27
//A smiley face ;]
<?php
header('Content-type: image/png');
$smile=imagecreate(400,400);
$kek=imagecolorallocate($smile,0,0,255);
$feher=imagecolorallocate($smile,255,255,255);
$sarga=imagecolorallocate($smile,255,255,0);
$fekete=imagecolorallocate($smile,0,0,0);
imagefill($smile,0,0,$kek);
imagearc($smile,200,200,300,300,0,360,$fekete);
imagearc($smile,200,225,200,150,0,180,$fekete);
imagearc($smile,200,225,200,123,0,180,$fekete);
imagearc($smile,150,150,20,20,0,360,$fekete);
imagearc($smile,250,150,20,20,0,360,$fekete);
imagefill($smile,200,200,$sarga);
imagefill($smile,200,290,$fekete);
imagefill($smile,155,155,$fekete);
imagefill($smile,255,155,$fekete);
imagepng($smile);
?>
pisu at estmail dot hu
29-Nov-2005 01:48
chess board
<?php
$kep = imagecreate(400,400);
$fekete = imagecolorallocate($kep,0,0,0);
$feher = imagecolorallocate($kep,255,255,255);
//imagefill($kep,50,50,$fekete);
imagefill($kep,50,20,$feher);
for ($i=1;$i<8;$i++) {
$k = $i*50;
imageline($kep,0,$k,400,$k,$fekete);
imageline($kep,$k,0,$k,400,$fekete);
}
for ($i=0;$i<8;$i++) {
for ($j=0;$j<8;$j++) {
$x = $i*50 + 2;
$y = $j*50 + 2;
if ( ( ($i % 2) + ($j % 2) ) % 2 == 0 ) {
imagefill($kep,$x,$y,$fekete);
}
}
}
// imagecolortransparent($kek,$piros);
header('content-type : image/png');
imagepng($kep);
?>
colin at galaxyinteractive dot net
28-Jul-2005 08:26
Didn't see this documented, although it's outlined in imagefilledrectangle, it wasn't quite so obvious to me at first
imageSetTile($image,$imageBack);
imagefill($image,0,0,IMG_COLOR_TILED);
Will fill an image with a texture (this is great as I'm building a logo/template creator)
Igor Garcia
28-Jun-2003 03:18
This function, cannot deal with transparencies.
So you need to use imagecolorallocate instead of imagecolorallocatealpha.
Thus, be careful with color variables that allready set with imageallocatecoloralpha because this can slow-down or hang-up your system.
norxh
04-Jun-2003 08:36
For new images, you must allocate a color before this function will work.
08-Feb-2003 05:49
Actually, it can handle pre-transparent images. To remove it you need to do something like:
imagecolortransparent($img, 0);
to null out the previous transparency colors. ;)
aqmprod at iname dot com
09-Jan-2000 05:08
This function does not seem to work with images already been transparent. If you fill at x=0, y=0, and there are still transparent parts that you did
not reach with your fill, they change to a different color.
The ImageColorSet function seems to be the solution, but i can't work with transparancy.