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<?php
/////////////////////////////////////////////////////////////////////////////
//
// image.antialias.inc.php
function imageSmoothLine( $image, $x1, $y1, $x2, $y2, $color, $trueColor = true ) {
$fullColor = imageColorsForIndex( $image, $color );
if ( abs( $x1 - $x2 ) > abs( $y1 - $y2 ) ) {
$m = ( $y2 - $y1 ) / ( $x2 - $x1 );
$b = $y1 - $m * $x1;
$strx = min( $x1, $x2 );
$endx = max( $x1, $x2 );
for ( $x = $strx; $x <= $endx; $x++ ) {
imageSetSmoothPixel( $image, $x, $m * $x + $b, $fullColor, $trueColor );
}
} else {
$m = ( $x2 - $x1 ) / ( $y2 - $y1 );
$b = $x1 - $m * $y1;
$stry = min( $y1, $y2 );
$endy = max( $y1, $y2 );
for ( $y = $stry; $y <= $endy; $y++ ) {
imageSetSmoothPixel( $image, $m * $y + $b, $y, $fullColor, $trueColor );
}
}
}
// Draw an antialiased pixel. This function basically allows x and y to be set as floats.
function imageSetSmoothPixel( $image, $x, $y, $fullColor, $trueColor = true ) {
$fx = floor( $x );
$fy = floor( $y );
$cx = ceil( $x );
$cy = ceil( $y );
$xa = $x - $fx;
$xb = $cx - $x;
$ya = $y - $fy;
$yb = $cy - $y;
if ( $cx == $fx and $cy == $fy ) {
imageSetSubPixel( $image, $fx, $fy, 0.0, 1.0, $fullColor, $trueColor );
} else {
imageSetSubPixel( $image, $fx, $fy, $xa + $ya, $xb + $yb, $fullColor, $trueColor );
if ( $cy != $fy ) {
imageSetSubPixel( $image, $fx, $cy, $xa + $yb, $xb + $ya, $fullColor, $trueColor );
}
if ( $cx != $fx ) {
imageSetSubPixel( $image, $cx, $fy, $xb + $ya, $xa + $yb, $fullColor, $trueColor );
if ( $cy != $fy ) {
imageSetSubPixel( $image, $cx, $cy, $xb + $yb, $xa + $ya, $fullColor, $trueColor );
}
}
}
}
function imageSetSubPixel( $image, $x, $y, $a, $b, $fullColor, $trueColor = true ) {
$tempColor = imageColorsForIndex( $image, imageColorAt( $image, $x, $y ) );
$tempColor[ 'red' ] = round( $tempColor[ 'red' ] * $a + $fullColor[ 'red' ] * $b );
$tempColor[ 'green' ] = round( $tempColor[ 'green' ] * $a + $fullColor[ 'green' ] * $b );
$tempColor[ 'blue' ] = round( $tempColor[ 'blue' ] * $a + $fullColor[ 'blue' ] * $b );
if ( $tempColor[ 'red' ] > 255 ) $tempColor[ 'red' ] = 255;
if ( $tempColor[ 'green' ] > 255 ) $tempColor[ 'green' ] = 255;
if ( $tempColor[ 'blue' ] > 255 ) $tempColor[ 'blue' ] = 255;
if ( $trueColor ) {
$newColor = imageColorExactAlpha( $image, $tempColor[ 'red' ], $tempColor[ 'green' ], $tempColor[ 'blue' ], 0 );
} else {
if ( imageColorExact( $image, $tempColor[ 'red' ], $tempColor[ 'green' ], $tempColor[ 'blue' ] ) == -1 ) {
imageColorAllocate( $image, $tempColor[ 'red' ], $tempColor[ 'green' ], $tempColor[ 'blue' ] );
}
$newColor = imageColorExact( $image, $tempColor[ 'red' ], $tempColor[ 'green' ], $tempColor[ 'blue' ] );
}
imageSetPixel( $image, $x, $y, $newColor );
}
?>
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