imageantialias

(PHP 4 >= 4.3.2, PHP 5, PHP 7, PHP 8)

imageantialias — Should antialias functions be used or not

Beschreibung

imageantialias(GdImage $image, bool $enable): bool

Activate the fast drawing antialiased methods for lines and wired polygons. It does not support alpha components. It works using a direct blend operation. It works only with truecolor images.

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.

Parameter-Liste

image: Ein GdImage-Objekt, das von einer der Funktionen zur Bilderzeugung, z. B. imagecreatetruecolor(), zurückgegeben wurde.
enable: Whether to enable antialiasing or not.

Rückgabewerte

Gibt bei Erfolg true zurück. Bei einem Fehler wird false zurückgegeben.

Changelog

Version	Beschreibung
8.0.0	`image` erwartet nun eine GdImage-Instanz; vorher wurde eine gültige `gd`-Ressource erwartet.
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.

Beispiele

Beispiel #1 A comparison of two lines, one with anti-aliasing switched on

<?php
// Setup an anti-aliased image and a normal image
$aa = imagecreatetruecolor(400, 100);
$normal = imagecreatetruecolor(200, 100);

// Switch antialiasing on for one image
imageantialias($aa, true);

// Allocate colors
$red = imagecolorallocate($normal, 255, 0, 0);
$red_aa = imagecolorallocate($aa, 255, 0, 0);

// Draw two lines, one with AA enabled
imageline($normal, 0, 0, 200, 100, $red);
imageline($aa, 0, 0, 200, 100, $red_aa);

// Merge the two images side by side for output (AA: left, Normal: Right)
imagecopymerge($aa, $normal, 200, 0, 0, 0, 200, 100, 100);

// Output image
header('Content-type: image/png');

imagepng($aa);
imagedestroy($aa);
imagedestroy($normal);
?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

Output of example : A comparison of two lines, one with anti-aliasing switched on

Siehe auch

imagecreatetruecolor() - Create a new true color image

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User Contributed Notes 8 notes

down

padigan ¶

17 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...

<?php
$realWidth = 500;
$realHeight = 500;
$srcWidth = $realWidth * 2;
$srcHeight = $realHeight * 2;

// create the larger source image
$srcImage = imagecreatetruecolor($srcWidth,$srcHeight);

// create the real/final image
$destImage = imagecreatetruecolor($realWidth,$realHeight);

// now do whatever you want to draw in the source image
// blah....

// now the picture is finished, do the shrink...
imagecopyresampled($destImage,$srcImage,0,0,0,0,
$realWidth,$realHeight,$srcWidth,$srcHeight);

// now just do whatever you want with '$destImage' (e.g. display or output to file!)
?>

down

trimbo ¶

19 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:
<?php
        $points=array($x,$y, $x2,$y2, $x3,$y3);
        imageFilledPolygon($im, $points, 3, $gray );
        imagePolygon($im, $points, 3, $gray );
?>

down

n-dream at gmx dot ch ¶

18 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<2*(M_PI);$i+=$jump)
    {
        $newx=$x+sin($i)*$w;
        $newy=$y+cos($i)*$h;
        ImageLine($img,$newx,$newy,$oldx,$oldy,$color);
        $oldx=$newx;
        $oldy=$newy;
    }
}

down

verdy_p at wanadoo dot fr ¶

14 years ago


There's a minor edit bug in those lines in the fast algorithm ("20 times faster"):

            imageLine( $img, $cx + $ix, $cy + $iy - 1, $cx + $ix, $cy + $ix, $fill );
            imageLine( $img, $cx + $ix, $cy - $iy + 1, $cx + $ix, $cy - $ix, $fill );
            imageLine( $img, $cx - $ix, $cy + $iy - 1, $cx - $ix, $cy + $ix, $fill );
            imageLine( $img, $cx - $ix, $cy - $iy + 1, $cx - $ix, $cy - $ix, $fill );
            imageLine( $img, $cx + $iy - 1, $cy + $ix, $cx + $ix, $cy + $ix, $fill );
            imageLine( $img, $cx + $iy - 1, $cy - $ix, $cx + $ix, $cy - $ix, $fill );
            imageLine( $img, $cx - $iy + 1, $cy + $ix, $cx - $ix, $cy + $ix, $fill );
            imageLine( $img, $cx - $iy + 1, $cy - $ix, $cx - $ix, $cy - $ix, $fill );

the reference to "$ix" in the parameters of each call (just before the ", $fill " parameter) should be sometimes "$iy".

This algorithm uses the Bresenham midpoint algorithm for circles, but computing successive pixels positions ($ix, $iy) incrementally in the first octant, relative to the circle center ($cx, $cy), then applying the 8 symetries by swapping them or changing signs.

A similar algorithm exists for ellipses: it uses quadrants symetries instead of octants when the ellipse focal axis is aligned or orthogonal to the two image axis, be subdividing each quadrant in two regions (deminited by the point on the arc where the tangent has a unitary slope).

For general ellipses (rotated arbitrarily in the plane), there are also 4 quadrants symetries, but they are a bit more complex to compute, as you need to compute the rotations, for this reason you'll only be able to use 2 symetries, but the incremental algorithm still exists: you may think that this would be based on the evaluation of the sum of lengths from the two focal points, which is contant; however the sum of two distance cannot be squared so easily (you would need to compute the square of both distances, then take their respective square root before adding them and testing the difference with the exact length. A cleaner solution uses NURBS (Non-Uniform Rational B-splines) because they are numerically stable and still very fast to compute (you only need some floatting point for the knot constants that separate each quadrant, which is then computed using a simple quadratic parametric equation of the ellipse instead of the implicit equation, given that the quadratic (polynomial) equation has first and scond derivatives that are easy to bound in order to get the needed precision and reduce the number of unnecessary pixel plots : such the parametric eqaution will draw points along the arc with a movement speed varying between 1 and 4 subpixel distance per incremental step, but in fact only between 1 and 2 subpixels when you subdivide the quadrant in two regions).

Alternatively, you may also draw an antialised "straight" ellipse with a double resolution, and then rotate the antiliased image while also rescale it at half size, and at the same time combining it to the target: depending on implementations (and computing language used), it may be faster (but it may require more memory for the intermediate image at scale 2)...

down

dsl101 ¶

15 years ago


Having tried long and hard to get a decent antialiased circle function, I finally gave in a wrote something from scratch. Its very very naive - basically examining every single pixel in the enclosing square, but as a result produces very nice antialiasing, with decent control over stroke width, antialiasing amount and tightness of antialiasing. I'm sure it could be optimised considerably, but it was fast enough for what I was doing. Hope its of some use.

<?php

function imagecircleaa($img, $cx, $cy, $r, $w, $s, $t, $color) // image, centerX, centerY, radius, stroke width, aa width, tightness, color
{
    $adj = $w + $s;
    $sCol = imagecolorallocate($img, $color['r'], $color['g'], $color['b']);
    for($x = -$r - $adj; $x <= $r + $adj; $x++)
    {
        for($y = -$r - $adj; $y <= $r + $adj; $y++)
        {
            $d = sqrt($x * $x + $y * $y); // distance from pixel to center
            $err = abs($d - $r); // absolute distance from pixel to circle edge
            if($err <= $w / 2 + $s) // within the stroke width + smoothing radius
            {
                if($err <= $w / 2) // inside the stroke width so make it solid color
                {
                    $aaCol = $sCol;
                }
                else // in the antialisaing region so make it a blended color
                {
                    $err -= $w / 2; // adjust to the aliased part
                    $err = 1 - $err / $s; // adjust to between 0 and 1
                    $err = ($err - 0.5) * $t * 2; // adjust to -$t to +$t for tightness 
                    $err = ($err / sqrt(1 + $err * $err) + 1) / 2; // sigmoid curve to smooth edges
                    $rgb = imagecolorat($img, $x + $cx, $y + $cy); // Get current background color
                    $rB = ($rgb >> 16) & 0xFF;
                    $gB = ($rgb >> 8) & 0xFF;
                    $bB = $rgb & 0xFF;
                    $rDelta = ($rB - $color['r']); // change in Red from background
                    $rComp = $rB - $rDelta * $err; // mix Red
                    $gDelta = ($gB - $color['g']); // change in Red from background
                    $gComp = $gB - $gDelta * $err; // mix Red
                    $bDelta = ($bB - $color['b']); // change in Red from background
                    $bComp = $bB - $bDelta * $err; // mix Red
                    $aaCol = imagecolorallocate($img, $rComp, $gComp, $bComp);
                }
                imagesetpixel($img, $x + $cx, $y + $cy, $aaCol);
            }
        }
    }
}

$img = imagecreatetruecolor(500,500);

$cBlack = imagecolorallocate($img, 0, 0, 0);
$cGrey = imagecolorallocate($img, 120, 120, 120);
$cWhite = imagecolorallocate($img, 255, 255, 255);

imagefill($img, 0, 0, $cWhite);
imagepolygon($img, array(0, 0,200, 0, 200, 200, 0, 200), 4, cBlack);

$aWhite = array('r'=>255, 'g'=>255, 'b'=>255);
$aBlack = array('r'=>0, 'g'=>0, 'b'=>0);
$aRed = array('r'=>200, 'g'=>0, 'b'=>0);
$aGreen = array('r'=>0, 'g'=>200, 'b'=>0);
$aBlue = array('r'=>0, 'g'=>0, 'b'=>255);

// standard ellipse function for comparison
imageellipse($img, 100, 100, 50, 50, $cBlack);

// compare different tightnesses - good values are between 2 and 8
// note overall width is stroke width + 2 * aa width (e.g. 12 pixels below)
imagecircleaa($img, 50, 50, 25, 2, 5, 2, $aBlue);
imagecircleaa($img, 50, 150, 25, 2, 5, 8, $aBlue);

// different coloured background to show blending
imagefilledrectangle($img, 150,150, 200, 200, $cGrey);
imagecircleaa($img, 150, 150, 25, 3, 2, 2, $aRed);

// overlapping circles still aa nicely, although the colour blending algorithm produces quite dark intermediate shades
imagecircleaa($img, 150, 60, 25, 2, 3, 2, $aBlue);
imagecircleaa($img, 150, 50, 25, 2, 3, 2, $aGreen);

header("Content-type: image/png");
imagepng($img);
imagedestroy($img);
?>

down

klaas at kosmokrator dot com ¶

18 years ago


Here is an optimized version of the optimized version of the antialiased circle function by sebbi: (more than 20 times faster)...

<?php

    function imageSmoothCircle( &$img, $cx, $cy, $cr, $color ) {
        $ir = $cr;
        $ix = 0;
        $iy = $ir;
        $ig = 2 * $ir - 3;
        $idgr = -6;
        $idgd = 4 * $ir - 10;
        $fill = imageColorExactAlpha( $img, $color[ 'R' ], $color[ 'G' ], $color[ 'B' ], 0 );
        imageLine( $img, $cx + $cr - 1, $cy, $cx, $cy, $fill );
        imageLine( $img, $cx - $cr + 1, $cy, $cx - 1, $cy, $fill );
        imageLine( $img, $cx, $cy + $cr - 1, $cx, $cy + 1, $fill );
        imageLine( $img, $cx, $cy - $cr + 1, $cx, $cy - 1, $fill );
        $draw = imageColorExactAlpha( $img, $color[ 'R' ], $color[ 'G' ], $color[ 'B' ], 42 );
        imageSetPixel( $img, $cx + $cr, $cy, $draw );
        imageSetPixel( $img, $cx - $cr, $cy, $draw );
        imageSetPixel( $img, $cx, $cy + $cr, $draw );
        imageSetPixel( $img, $cx, $cy - $cr, $draw );
        while ( $ix <= $iy - 2 ) {
            if ( $ig < 0 ) {
                $ig += $idgd;
                $idgd -= 8;
                $iy--;
            } else {
                $ig += $idgr;
                $idgd -= 4;
            }
            $idgr -= 4;
            $ix++;
            imageLine( $img, $cx + $ix, $cy + $iy - 1, $cx + $ix, $cy + $ix, $fill );
            imageLine( $img, $cx + $ix, $cy - $iy + 1, $cx + $ix, $cy - $ix, $fill );
            imageLine( $img, $cx - $ix, $cy + $iy - 1, $cx - $ix, $cy + $ix, $fill );
            imageLine( $img, $cx - $ix, $cy - $iy + 1, $cx - $ix, $cy - $ix, $fill );
            imageLine( $img, $cx + $iy - 1, $cy + $ix, $cx + $ix, $cy + $ix, $fill );
            imageLine( $img, $cx + $iy - 1, $cy - $ix, $cx + $ix, $cy - $ix, $fill );
            imageLine( $img, $cx - $iy + 1, $cy + $ix, $cx - $ix, $cy + $ix, $fill );
            imageLine( $img, $cx - $iy + 1, $cy - $ix, $cx - $ix, $cy - $ix, $fill );
            $filled = 0;
            for ( $xx = $ix - 0.45; $xx < $ix + 0.5; $xx += 0.2 ) {
                for ( $yy = $iy - 0.45; $yy < $iy + 0.5; $yy += 0.2 ) {
                    if ( sqrt( pow( $xx, 2 ) + pow( $yy, 2 ) ) < $cr ) $filled += 4;
                }
            }
            $draw = imageColorExactAlpha( $img, $color[ 'R' ], $color[ 'G' ], $color[ 'B' ], ( 100 - $filled ) );
            imageSetPixel( $img, $cx + $ix, $cy + $iy, $draw );
            imageSetPixel( $img, $cx + $ix, $cy - $iy, $draw );
            imageSetPixel( $img, $cx - $ix, $cy + $iy, $draw );
            imageSetPixel( $img, $cx - $ix, $cy - $iy, $draw );
            imageSetPixel( $img, $cx + $iy, $cy + $ix, $draw );
            imageSetPixel( $img, $cx + $iy, $cy - $ix, $draw );
            imageSetPixel( $img, $cx - $iy, $cy + $ix, $draw );
            imageSetPixel( $img, $cx - $iy, $cy - $ix, $draw );
        }
    }

    $img = imageCreateTrueColor( 320, 240 );

    imageSmoothCircle( $img, 160, 120, 100, array( 'R' => 0xCC, 'G' => 0x33, 'B' => 0x00 ) );
    imageSmoothCircle( $img, 170, 110,  75, array( 'R' => 0xDD, 'G' => 0x66, 'B' => 0x00 ) );
    imageSmoothCircle( $img, 180, 100,  50, array( 'R' => 0xEE, 'G' => 0x99, 'B' => 0x00 ) );
    imageSmoothCircle( $img, 190,  90,  25, array( 'R' => 0xFF, 'G' => 0xCC, 'B' => 0x00 ) );

    header( 'Content-Type: image/png' );
    imagePNG( $img );

?>

down

sebbi at conceptT dot com ¶

19 years ago


I did a search in google and got following url:
http://www.isocalc.com/tutorials/antialias.htm
With this tutorial I was able to write a function to convert this algorithm into php, the result for a filled circel is this:
<?php
function imagefilledcircleantialiased(&$im, $cx, $cy, $r, $fgcolor, $bgcolor) {
  $fgcolors = imagecolorsforindex($im,$fgcolor);
  $bgcolors = imagecolorsforindex($im,$bgcolor);
  for ( $x = $cx - $r; $x <= $cx + $r; $x++ ) {
    for ( $y = $cy - $r; $y <= $cy + $r; $y++ ) {
      $rx = $x - $cx; $ry = $y - $cy;
      $ir = sqrt(( $rx == 0 ? 0 : pow($rx - 0.5*abs($rx)/$rx, 2) ) + ( $ry == 0 ? 0 : pow($ry - 0.5*abs($ry)/$ry, 2) ));
      $or = sqrt(( $rx == 0 ? 0 : pow($rx + 0.5*abs($rx)/$rx, 2) ) + ( $ry == 0 ? 0 : pow($ry + 0.5*abs($ry)/$ry, 2) ));
      if ( $or <= $r ) {
        imagesetpixel($im, $x, $y, $fgcolor);
      }
      elseif ( $ir < $r ) {
        $filled = 0;
        for ( $xx = $x - 0.45; $xx < $x + 0.5; $xx+=0.1 ) {
          for ( $yy = $y - 0.45; $yy < $y + 0.5; $yy+=0.1 ) {
            $rxx = $xx - $cx; $ryy = $yy - $cy;
            if ( sqrt(pow($rxx, 2) + pow($ryy, 2)) < $r ) $filled++;
          }
        }
        $red = round($bgcolors['red'] + ( $fgcolors['red'] - $bgcolors['red'] ) * $filled / 100);
        $green = round($bgcolors['green'] + ( $fgcolors['green'] - $bgcolors['green'] ) * $filled / 100);
        $blue = round($bgcolors['blue'] + ( $fgcolors['blue'] - $bgcolors['blue'] ) * $filled / 100);
        imagesetpixel($im, $x, $y, imagecolorclosest($im, $red, $green, $blue));
      }
    }
  }
}

$width = 160;
$height = 200;
$r = 20;
$bgc = "651713";
$fgc = "b12b2c";

$im = imagecreate($width, $height);
$bgcolor = imagecolorallocate($im, hexdec(substr($bgc, 0, 2)), hexdec(substr($bgc, 2, 2)), hexdec(substr($bgc, 4, 2)));
for( $i = 0; $i < 100; $i++ ) {
    imagecolorallocate($im, ( hexdec(substr($fgc, 0, 2)) + $i*hexdec(substr($bgc, 0, 2))) / ($i + 1), ( hexdec(substr($fgc, 2, 2)) + $i*hexdec(substr($bgc, 2, 2))) / ($i + 1), ( hexdec(substr($fgc, 4, 2)) + $i*hexdec(substr($bgc, 4, 2))) / ($i + 1));
}
$fgcolor = imagecolorclosest($im, hexdec(substr($fgc, 0, 2)), hexdec(substr($fgc, 2, 2)), hexdec(substr($fgc, 4, 2)));

imagefilledcircleantialiased($im, 80, 100, $r, $fgcolor, $bgcolor);

header("Content-Type: image/png");
imagepng($im);
?>
An improvement would be to draw the inner rectangle or more rectangles in the circle with the builtin rectangle function to reduce the usage of imagesetpixel() from (2*r)^2 to 2*Pi*(r + epsilon), in other words, the dependency on r would break down from square to linear.
Another improvement would be to determine filled and unfilled triangles in the observed pixel and calculate their areas, so we can get rid of the inner loops for getting the fraction filled/unfilled.
One can easily modify this function to solve other problems like lines, unfilled circles, etc.

down

-2

voinic at NOSgmailPAM dot com ¶

18 years ago


The only trick I found to draw an antialiased polygon AND keep it transparent (to use them as overlays in google maps for example)... make two images and merge them. Order of operations is important and the transparency color of the final image must be set after the merge:

<?
header("Content-type: image/png");

$values = array(
           40,  50,  // Point 1 (x, y)
           20,  240, // Point 2 (x, y)
           60,  60,  // Point 3 (x, y)
           240, 20,  // Point 4 (x, y)
           50,  40,  // Point 5 (x, y)
           10,  10  // Point 6 (x, y)
           );                    

$im = imagecreate(250, 250);
$bg = imagecolorallocate($im, 255, 255, 255);

$im2 = imagecreatetruecolor(250, 250);
$bg2 = imagecolorallocate($im2, 255, 255, 255);
imagefilledrectangle($im2,0,0,249,249,$bg2);
imagecolortransparent($im2, $bg);
imageantialias($im2, true);
$c_red = imagecolorallocate($im2, 255, 0, 0);
imagepolygon($im2, $values, 6, $c_red);
imageantialias($im2, false);

imagecopymerge($im, $im2,0,0,0,0,250,250,50);

imagecolortransparent($im, $bg);
$c_red_alpha = imagecolorallocatealpha($im, 255, 0, 0, 60);
imagefilledpolygon($im, $values, 6, $c_red_alpha);

imagepng($im);
imagedestroy($im);
imagedestroy($im2);
?>

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