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<?php |
/*======================================================================= |
// File: JPGRAPH_GRADIENT.PHP |
// Description: Create a color gradient |
// Created: 2003-02-01 |
// Author: Johan Persson (johanp@aditus.nu) |
// Ver: $Id: jpgraph_gradient.php,v 1.1 2004/06/15 10:13:19 jpm Exp $ |
// |
// License: This code is released under QPL |
// Copyright (C) 2003 Johan Persson |
//======================================================================== |
*/ |
|
|
//=================================================== |
// CLASS Gradient |
// Description: Handles gradient fills. This is to be |
// considered a "friend" class of Class Image. |
//=================================================== |
class Gradient { |
var $img=null; |
//--------------- |
// CONSTRUCTOR |
function Gradient(&$img) { |
$this->img = $img; |
} |
|
//--------------- |
// PUBLIC METHODS |
// Produce a gradient filled rectangle with a smooth transition between |
// two colors. |
// ($xl,$yt) Top left corner |
// ($xr,$yb) Bottom right |
// $from_color Starting color in gradient |
// $to_color End color in the gradient |
// $style Which way is the gradient oriented? |
function FilledRectangle($xl,$yt,$xr,$yb,$from_color,$to_color,$style=1) { |
switch( $style ) { |
case 1: // HORIZONTAL |
$steps = abs($xr-$xl); |
$delta = $xr>=$xl ? 1 : -1; |
$this->GetColArray($from_color,$to_color,$steps,$colors); |
for( $i=0, $x=$xl; $i<$steps; ++$i ) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($x,$yt,$x,$yb); |
$x += $delta; |
} |
break; |
|
case 2: // VERTICAL |
$steps = abs($yb-$yt); |
$delta = $yb>=$yt ? 1 : -1; |
$this->GetColArray($from_color,$to_color,$steps,$colors); |
for($i=0,$y=$yt; $i<$steps; ++$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($xl,$y,$xr,$y); |
$y += $delta; |
} |
break; |
|
case 3: // VERTICAL FROM MIDDLE |
$steps = abs($yb-$yt)/2; |
$delta = $yb>=$yt ? 1 : -1; |
$this->GetColArray($from_color,$to_color,$steps,$colors); |
for($y=$yt, $i=0; $i < $steps; ++$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($xl,$y,$xr,$y); |
$y += $delta; |
} |
--$i; |
for($j=0; $j < $steps; ++$j, --$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($xl,$y,$xr,$y); |
$y += $delta; |
} |
$this->img->Line($xl,$y,$xr,$y); |
break; |
|
case 4: // HORIZONTAL FROM MIDDLE |
$steps = abs($xr-$xl)/2; |
$delta = $xr>=$xl ? 1 : -1; |
$this->GetColArray($from_color,$to_color,$steps,$colors); |
for($x=$xl, $i=0; $i<$steps; ++$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
--$i; |
for($j=0; $j<$steps; ++$j, --$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
$this->img->Line($x,$yb,$x,$yt); |
break; |
|
case 6: // HORIZONTAL WIDER MIDDLE |
$steps = abs($xr-$xl)/3; |
$delta = $xr>=$xl ? 1 : -1; |
$this->GetColArray($from_color,$to_color,$steps,$colors); |
for($x=$xl, $i=0; $i < $steps; ++$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
--$i; |
$this->img->current_color = $colors[$i]; |
for($j=0; $j< $steps; ++$j) { |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
|
for($j=0; $j<$steps; ++$j, --$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
break; |
|
|
case 8: // LEFT REFLECTION |
$steps1 = round(0.3*abs($xr-$xl)); |
$delta = $xr>=$xl ? 1 : -1; |
|
$this->GetColArray($from_color.':1.3',$to_color,$steps1,$colors); |
for($x=$xl, $i=0; $i < $steps1; ++$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
$steps2 = max(1,round(0.08*abs($xr-$xl))); |
$this->img->SetColor($to_color); |
for($j=0; $j< $steps2; ++$j) { |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
$steps = abs($xr-$xl)-$steps1-$steps2; |
$this->GetColArray($to_color,$from_color,$steps,$colors); |
for($i=0; $i < $steps; ++$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
break; |
|
case 9: // RIGHT REFLECTION |
$steps1 = round(0.7*abs($xr-$xl)); |
$delta = $xr>=$xl ? 1 : -1; |
|
$this->GetColArray($from_color,$to_color,$steps1,$colors); |
for($x=$xl, $i=0; $i < $steps1; ++$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
$steps2 = max(1,round(0.08*abs($xr-$xl))); |
$this->img->SetColor($to_color); |
for($j=0; $j< $steps2; ++$j) { |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
$steps = abs($xr-$xl)-$steps1-$steps2; |
$this->GetColArray($to_color,$from_color.':1.3',$steps,$colors); |
for($i=0; $i < $steps; ++$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
break; |
|
|
|
case 7: // VERTICAL WIDER MIDDLE |
$steps = abs($yb-$yt)/3; |
$delta = $yb>=$yt? 1 : -1; |
$this->GetColArray($from_color,$to_color,$steps,$colors); |
for($y=$yt, $i=0; $i<$steps; ++$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($xl,$y,$xr,$y); |
$y += $delta; |
} |
--$i; |
$this->img->current_color = $colors[$i]; |
for($j=0; $j< $steps; ++$j) { |
$this->img->Line($xl,$y,$xr,$y); |
$y += $delta; |
} |
for($j=0; $j<$steps; ++$j, --$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($xl,$y,$xr,$y); |
$y += $delta; |
} |
break; |
|
case 5: // Rectangle |
$steps = floor(min(($yb-$yt)+1,($xr-$xl)+1)/2); |
$this->GetColArray($from_color,$to_color,$steps,$colors); |
$dx = ($xr-$xl)/2; |
$dy = ($yb-$yt)/2; |
$x=$xl;$y=$yt;$x2=$xr;$y2=$yb; |
for($x=$xl, $i=0; $x<$xl+$dx && $y<$yt+$dy ; ++$x, ++$y, --$x2, --$y2, ++$i) { |
assert($i<count($colors)); |
$this->img->current_color = $colors[$i]; |
$this->img->Rectangle($x,$y,$x2,$y2); |
} |
$this->img->Line($x,$y,$x2,$y2); |
break; |
|
default: |
die("JpGraph Error: Unknown gradient style (=$style)."); |
break; |
} |
} |
|
//--------------- |
// PRIVATE METHODS |
// Add to the image color map the necessary colors to do the transition |
// between the two colors using $numcolors intermediate colors |
function GetColArray($from_color,$to_color,$arr_size,&$colors,$numcols=100) { |
if( $arr_size==0 ) return; |
// If color is given as text get it's corresponding r,g,b values |
$from_color = $this->img->rgb->Color($from_color); |
$to_color = $this->img->rgb->Color($to_color); |
|
$rdelta=($to_color[0]-$from_color[0])/$numcols; |
$gdelta=($to_color[1]-$from_color[1])/$numcols; |
$bdelta=($to_color[2]-$from_color[2])/$numcols; |
$colorsperstep = $numcols/$arr_size; |
$prevcolnum = -1; |
for ($i=0; $i<$arr_size; ++$i) { |
$colnum = floor($colorsperstep*$i); |
if ( $colnum == $prevcolnum ) |
$colors[$i] = $colidx; |
else { |
$r = floor($from_color[0] + $colnum*$rdelta); |
$g = floor($from_color[1] + $colnum*$gdelta); |
$b = floor($from_color[2] + $colnum*$bdelta); |
$colidx = $this->img->rgb->Allocate(sprintf("#%02x%02x%02x",$r,$g,$b)); |
$colors[$i] = $colidx; |
} |
$prevcolnum = $colnum; |
} |
} |
} // Class |
|
?> |