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<?php |
/*======================================================================= |
// File: JPGRAPH_GRADIENT.PHP |
// Description: Create a color gradient |
// Created: 2003-02-01 |
// Ver: $Id: jpgraph_gradient.php 1761 2009-08-01 08:31:28Z ljp $ |
// |
// Copyright (c) Aditus Consulting. All rights reserved. |
//======================================================================== |
*/ |
|
// Styles for gradient color fill |
define("GRAD_VER",1); |
define("GRAD_VERT",1); |
define("GRAD_HOR",2); |
define("GRAD_MIDHOR",3); |
define("GRAD_MIDVER",4); |
define("GRAD_CENTER",5); |
define("GRAD_WIDE_MIDVER",6); |
define("GRAD_WIDE_MIDHOR",7); |
define("GRAD_LEFT_REFLECTION",8); |
define("GRAD_RIGHT_REFLECTION",9); |
define("GRAD_RAISED_PANEL",10); |
define("GRAD_DIAGONAL",11); |
|
//=================================================== |
// CLASS Gradient |
// Description: Handles gradient fills. This is to be |
// considered a "friend" class of Class Image. |
//=================================================== |
class Gradient { |
private $img=null, $numcolors=100; |
//--------------- |
// CONSTRUCTOR |
function __construct(&$img) { |
$this->img = $img; |
} |
|
|
function SetNumColors($aNum) { |
$this->numcolors=$aNum; |
} |
//--------------- |
// 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) { |
$this->img->SetLineWeight(1); |
switch( $style ) { |
case GRAD_VER: |
$steps = ceil(abs($xr-$xl)+1); |
$delta = $xr>=$xl ? 1 : -1; |
$this->GetColArray($from_color,$to_color,$steps,$colors,$this->numcolors); |
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 GRAD_HOR: |
$steps = ceil(abs($yb-$yt)+1); |
$delta = $yb >= $yt ? 1 : -1; |
$this->GetColArray($from_color,$to_color,$steps,$colors,$this->numcolors); |
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 GRAD_MIDHOR: |
$steps = ceil(abs($yb-$yt)/2); |
$delta = $yb >= $yt ? 1 : -1; |
$this->GetColArray($from_color,$to_color,$steps,$colors,$this->numcolors); |
for($y=$yt, $i=0; $i < $steps; ++$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($xl,$y,$xr,$y); |
$y += $delta; |
} |
--$i; |
if( abs($yb-$yt) % 2 == 1 ) { |
--$steps; |
} |
for($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 GRAD_MIDVER: |
$steps = ceil(abs($xr-$xl)/2); |
$delta = $xr>=$xl ? 1 : -1; |
$this->GetColArray($from_color,$to_color,$steps,$colors,$this->numcolors); |
for($x=$xl, $i=0; $i < $steps; ++$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
--$i; |
if( abs($xr-$xl) % 2 == 1 ) { |
--$steps; |
} |
for($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 GRAD_WIDE_MIDVER: |
$diff = ceil(abs($xr-$xl)); |
$steps = floor(abs($diff)/3); |
$firststep = $diff - 2*$steps ; |
$delta = $xr >= $xl ? 1 : -1; |
$this->GetColArray($from_color,$to_color,$firststep,$colors,$this->numcolors); |
for($x=$xl, $i=0; $i < $firststep; ++$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 GRAD_WIDE_MIDHOR: |
$diff = ceil(abs($yb-$yt)); |
$steps = floor(abs($diff)/3); |
$firststep = $diff - 2*$steps ; |
$delta = $yb >= $yt? 1 : -1; |
$this->GetColArray($from_color,$to_color,$firststep,$colors,$this->numcolors); |
for($y=$yt, $i=0; $i < $firststep; ++$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 GRAD_LEFT_REFLECTION: |
$steps1 = ceil(0.3*abs($xr-$xl)); |
$delta = $xr>=$xl ? 1 : -1; |
|
$from_color = $this->img->rgb->Color($from_color); |
$adj = 1.4; |
$m = ($adj-1.0)*(255-min(255,min($from_color[0],min($from_color[1],$from_color[2])))); |
$from_color2 = array(min(255,$from_color[0]+$m), |
min(255,$from_color[1]+$m), min(255,$from_color[2]+$m)); |
|
$this->GetColArray($from_color2,$to_color,$steps1,$colors,$this->numcolors); |
$n = count($colors); |
for($x=$xl, $i=0; $i < $steps1 && $i < $n; ++$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
$steps2 = max(1,ceil(0.08*abs($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,$colors,$this->numcolors); |
$n = count($colors); |
for($i=0; $i < $steps && $i < $n; ++$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
break; |
|
case GRAD_RIGHT_REFLECTION: |
$steps1 = ceil(0.7*abs($xr-$xl)); |
$delta = $xr>=$xl ? 1 : -1; |
|
$this->GetColArray($from_color,$to_color,$steps1,$colors,$this->numcolors); |
$n = count($colors); |
for($x=$xl, $i=0; $i < $steps1 && $i < $n; ++$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
$steps2 = max(1,ceil(0.08*abs($xr-$xl))); |
$this->img->SetColor($to_color); |
for($j=0; $j< $steps2; ++$j) { |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
|
$from_color = $this->img->rgb->Color($from_color); |
$adj = 1.4; |
$m = ($adj-1.0)*(255-min(255,min($from_color[0],min($from_color[1],$from_color[2])))); |
$from_color = array(min(255,$from_color[0]+$m), |
min(255,$from_color[1]+$m), min(255,$from_color[2]+$m)); |
|
$steps = abs($xr-$xl)-$steps1-$steps2; |
$this->GetColArray($to_color,$from_color,$steps,$colors,$this->numcolors); |
$n = count($colors); |
for($i=0; $i < $steps && $i < $n; ++$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
break; |
|
case GRAD_CENTER: |
$steps = ceil(min(($yb-$yt)+1,($xr-$xl)+1)/2); |
$this->GetColArray($from_color,$to_color,$steps,$colors,$this->numcolors); |
$dx = ($xr-$xl)/2; |
$dy = ($yb-$yt)/2; |
$x=$xl;$y=$yt;$x2=$xr;$y2=$yb; |
$n = count($colors); |
for($x=$xl, $i=0; $x < $xl+$dx && $y < $yt+$dy && $i < $n; ++$x, ++$y, --$x2, --$y2, ++$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Rectangle($x,$y,$x2,$y2); |
} |
$this->img->Line($x,$y,$x2,$y2); |
break; |
|
case GRAD_RAISED_PANEL: |
// right to left |
$steps1 = $xr-$xl; |
$delta = $xr>=$xl ? 1 : -1; |
$this->GetColArray($to_color,$from_color,$steps1,$colors,$this->numcolors); |
$n = count($colors); |
for($x=$xl, $i=0; $i < $steps1 && $i < $n; ++$i) { |
$this->img->current_color = $colors[$i]; |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
|
// left to right |
$xr -= 3; |
$xl += 3; |
$yb -= 3; |
$yt += 3; |
$steps2 = $xr-$xl; |
$delta = $xr>=$xl ? 1 : -1; |
for($x=$xl, $j=$steps2; $j >= 0; --$j) { |
$this->img->current_color = $colors[$j]; |
$this->img->Line($x,$yb,$x,$yt); |
$x += $delta; |
} |
break; |
|
case GRAD_DIAGONAL: |
// use the longer dimension to determine the required number of steps. |
// first loop draws from one corner to the mid-diagonal and the second |
// loop draws from the mid-diagonal to the opposing corner. |
if($xr-$xl > $yb - $yt) { |
// width is greater than height -> use x-dimension for steps |
$steps = $xr-$xl; |
$delta = $xr>=$xl ? 1 : -1; |
$this->GetColArray($from_color,$to_color,$steps*2,$colors,$this->numcolors); |
$n = count($colors); |
|
for($x=$xl, $i=0; $i < $steps && $i < $n; ++$i) { |
$this->img->current_color = $colors[$i]; |
$y = $yt+($i/$steps)*($yb-$yt)*$delta; |
$this->img->Line($x,$yt,$xl,$y); |
$x += $delta; |
} |
|
for($x=$xl, $i = 0; $i < $steps && $i < $n; ++$i) { |
$this->img->current_color = $colors[$steps+$i]; |
$y = $yt+($i/$steps)*($yb-$yt)*$delta; |
$this->img->Line($x,$yb,$xr,$y); |
$x += $delta; |
} |
} else { |
// height is greater than width -> use y-dimension for steps |
$steps = $yb-$yt; |
$delta = $yb>=$yt ? 1 : -1; |
$this->GetColArray($from_color,$to_color,$steps*2,$colors,$this->numcolors); |
$n = count($colors); |
|
for($y=$yt, $i=0; $i < $steps && $i < $n; ++$i) { |
$this->img->current_color = $colors[$i]; |
$x = $xl+($i/$steps)*($xr-$xl)*$delta; |
$this->img->Line($x,$yt,$xl,$y); |
$y += $delta; |
} |
|
for($y=$yt, $i = 0; $i < $steps && $i < $n; ++$i) { |
$this->img->current_color = $colors[$steps+$i]; |
$x = $xl+($i/$steps)*($xr-$xl)*$delta; |
$this->img->Line($x,$yb,$xr,$y); |
$x += $delta; |
} |
|
} |
break; |
|
default: |
JpGraphError::RaiseL(7001,$style); |
//("Unknown gradient style (=$style)."); |
break; |
} |
} |
|
// Fill a special case of a polygon with a flat bottom |
// with a gradient. Can be used for filled line plots. |
// Please note that this is NOT a generic gradient polygon fill |
// routine. It assumes that the bottom is flat (like a drawing |
// of a mountain) |
function FilledFlatPolygon($pts,$from_color,$to_color) { |
if( count($pts) == 0 ) return; |
|
$maxy=$pts[1]; |
$miny=$pts[1]; |
$n = count($pts) ; |
for( $i=0, $idx=0; $i < $n; $i += 2) { |
$x = round($pts[$i]); |
$y = round($pts[$i+1]); |
$miny = min($miny,$y); |
$maxy = max($maxy,$y); |
} |
|
$colors = array(); |
$this->GetColArray($from_color,$to_color,abs($maxy-$miny)+1,$colors,$this->numcolors); |
for($i=$miny, $idx=0; $i <= $maxy; ++$i ) { |
$colmap[$i] = $colors[$idx++]; |
} |
|
$n = count($pts)/2 ; |
$idx = 0 ; |
while( $idx < $n-1 ) { |
$p1 = array(round($pts[$idx*2]),round($pts[$idx*2+1])); |
$p2 = array(round($pts[++$idx*2]),round($pts[$idx*2+1])); |
|
// Find the largest rectangle we can fill |
$y = max($p1[1],$p2[1]) ; |
for($yy=$maxy; $yy > $y; --$yy) { |
$this->img->current_color = $colmap[$yy]; |
$this->img->Line($p1[0],$yy,$p2[0]-1,$yy); |
} |
|
if( $p1[1] == $p2[1] ) { |
continue; |
} |
|
// Fill the rest using lines (slow...) |
$slope = ($p2[0]-$p1[0])/($p1[1]-$p2[1]); |
$x1 = $p1[0]; |
$x2 = $p2[0]-1; |
$start = $y; |
if( $p1[1] > $p2[1] ) { |
while( $y >= $p2[1] ) { |
$x1=$slope*($start-$y)+$p1[0]; |
$this->img->current_color = $colmap[$y]; |
$this->img->Line($x1,$y,$x2,$y); |
--$y; |
} |
} |
else { |
while( $y >= $p1[1] ) { |
$x2=$p2[0]+$slope*($start-$y); |
$this->img->current_color = $colmap[$y]; |
$this->img->Line($x1,$y,$x2,$y); |
--$y; |
} |
} |
} |
} |
|
//--------------- |
// 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; |
$from_alpha = $from_color[3]; |
$to_alpha = $to_color[3]; |
$adelta = ( $to_alpha - $from_alpha ) / $numcols ; |
for ($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); |
$alpha = $from_alpha + $colnum*$adelta; |
$colidx = $this->img->rgb->Allocate(sprintf("#%02x%02x%02x",$r,$g,$b),$alpha); |
$colors[$i] = $colidx; |
} |
$prevcolnum = $colnum; |
} |
} |
} // Class |
|
?> |