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-rw-r--r--html/jpgraph/jpgraph_gradient.php434
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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) Asial Corporation. 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
-
-?>
generated by cgit (git 2.34.1) at 2025-06-15 22:09:04 +0000