imageantialias()

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

是否使用抗锯齿（antialias）功能

说明

imageantialias(resource $image,bool $enabled): bool

对线段和多边形启用快速画图抗锯齿方法。不支持 alpha 部分。使用直接混色操作。仅用于真彩色图像。

不支持线宽和风格。

使用抗锯齿和透明背景色可能出现未预期的结果。混色方法把背景色当成任何其它颜色使用。缺乏 alpha 部分的支持导致不允许基于 alpha 抗锯齿方法。

参数

$image

由图象创建函数(例如imagecreatetruecolor())返回的图象资源。

$enabled

是否启用抗锯齿。

返回值

成功时返回TRUE，或者在失败时返回FALSE。

范例

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);
?>

以上例程的输出类似于：

注释

Note:此函数仅在与 GD 库捆绑编译的 PHP 版本中可用。

参见

• imagecreatetruecolor()新建一个真彩色图像

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!)
?>

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 );
?>

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;
  }
}

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)...

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 );
?>

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);
?>

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.

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);
?>