[PHP 4 >= 4.3.2, PHP 5, PHP 7, PHP 8] imageantialias — Should antialias functions be used or not imageantialias[GdImage Thickness and styled are not supported. Using antialiased primitives with transparent background color can end with some unexpected
results. The blend method uses the background color as any other colors. The lack of alpha component support does not allow an alpha based antialiasing method. A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor[]. Whether to enable antialiasing or not. Returns Example #1 A comparison of two lines, one with anti-aliasing switched onDescription
$image, bool $enable]: boolParameters
imageenableReturn Values
true on success or false on
failure. Changelog
VersionDescription 8.0.0
image expects a GdImage instance now; previously, a resource was expected.
7.2.0
imageantialias[] is now generally available. Formerly it was only available if PHP was compiled with the bundled version of the GD library.
Examples
The above example will output something similar to:
padigan ¶
15 years ago
If you can't be bothered creating [or searching for] a full screen antialias function.
You can actually cheat [well a bit of a dirty inefficient hack really!!]
and perform a fake antialias on an image by using 'imagecopyresampled'...
first create your source image twice the size of what you really want.
Then use 'imagecopyresampled' to shrink it to half the size, the function
automatically interpolates pixels to create an antialias effect!
I've used this in a pie chart function and it works brilliantly,
not as slow as I thought it might be!
the rough code below should give you the idea...
trimbo ¶
16 years ago
So far using PHP 5.0.4 I've managed to get Imageantialias[] to work well with:
ImageLine[]
ImagePolygon[]
but not with:
ImageArc[]
ImageEllipse[]
ImageFilled*[]
You can still draw antialiased filled polygons by drawing a hollow polygon on top of a filled one with the same dimensions:
n-dream at gmx dot ch ¶
16 years ago
The following function draws an AntiAliased [unfilled] Ellipse.
It is used just liked the nomral ImageEllipse function.
The optional parameter sets the number of segments...
function ImageEllipseAA[ &$img, $x, $y, $w, $h,$color,$segments=70]
{
$w=$w/2;
$h=$h/2;
$jump=2*M_PI/$segments;
$oldx=$x+sin[-$jump]*$w;
$oldy=$y+cos[-$jump]*$h;
for[$i=0;$i