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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 21 2005-05-30 20:35:34Z 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);
//===================================================
// CLASS Gradient
// Description: Handles gradient fills. This is to be
// considered a "friend" class of Class Image.
//===================================================
class Gradient {
var $img=null;
var $numcolors=100;
//---------------
// CONSTRUCTOR
function Gradient(&$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) {
switch( $style ) {
case GRAD_VER:
$steps = round(abs($xr-$xl));
$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:
$steps = round(abs($yb-$yt));
$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:
$steps = round(abs($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:
$steps = round(abs($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:
$diff = round(abs($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:
$diff = round(abs($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:
$steps1 = round(0.3*abs($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;
}
$steps2 = max(1,round(0.08*abs($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,$colors,$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:
$steps1 = round(0.7*abs($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;
}
$steps2 = max(1,round(0.08*abs($xr-$xl)));
$this->img->SetColor($to_color);
for($j=0; $j< $steps2; ++$j) {
$this->img->Line($x,$yb,$x,$yt);
$x += $delta;
}
$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 += $delta;
}
break;
default:
JpGraphError::Raise("Unknown gradient style (=$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
?>
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