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aurelien |
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<?php
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/*=======================================================================
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// File: JPGRAPH_GRADIENT.PHP
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// Description: Create a color gradient
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// Created: 2003-02-01
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// Ver: $Id: jpgraph_gradient.php 946 2007-10-19 22:14:00Z ljp $
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//
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// Copyright (c) Aditus Consulting. All rights reserved.
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//========================================================================
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*/
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// Styles for gradient color fill
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DEFINE("GRAD_VER",1);
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DEFINE("GRAD_VERT",1);
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DEFINE("GRAD_HOR",2);
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DEFINE("GRAD_MIDHOR",3);
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DEFINE("GRAD_MIDVER",4);
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DEFINE("GRAD_CENTER",5);
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DEFINE("GRAD_WIDE_MIDVER",6);
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DEFINE("GRAD_WIDE_MIDHOR",7);
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DEFINE("GRAD_LEFT_REFLECTION",8);
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DEFINE("GRAD_RIGHT_REFLECTION",9);
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DEFINE("GRAD_RAISED_PANEL",10);
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DEFINE("GRAD_DIAGONAL",11);
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//===================================================
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// CLASS Gradient
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// Description: Handles gradient fills. This is to be
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// considered a "friend" class of Class Image.
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//===================================================
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class Gradient {
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var $img=null;
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var $numcolors=100;
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//---------------
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// CONSTRUCTOR
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function Gradient(&$img) {
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$this->img = &$img;
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}
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function SetNumColors($aNum) {
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$this->numcolors=$aNum;
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}
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//---------------
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// PUBLIC METHODS
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// Produce a gradient filled rectangle with a smooth transition between
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// two colors.
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// ($xl,$yt) Top left corner
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// ($xr,$yb) Bottom right
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// $from_color Starting color in gradient
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// $to_color End color in the gradient
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// $style Which way is the gradient oriented?
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function FilledRectangle($xl,$yt,$xr,$yb,$from_color,$to_color,$style=1) {
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switch( $style ) {
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case GRAD_VER:
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$steps = ceil(abs($xr-$xl));
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$delta = $xr>=$xl ? 1 : -1;
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$this->GetColArray($from_color,$to_color,$steps,$colors,$this->numcolors);
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for( $i=0, $x=$xl; $i < $steps; ++$i ) {
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$this->img->current_color = $colors[$i];
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$this->img->Line($x,$yt,$x,$yb);
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$x += $delta;
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}
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break;
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case GRAD_HOR:
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$steps = ceil(abs($yb-$yt));
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$delta = $yb>=$yt ? 1 : -1;
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$this->GetColArray($from_color,$to_color,$steps,$colors,$this->numcolors);
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for($i=0,$y=$yt; $i < $steps; ++$i) {
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$this->img->current_color = $colors[$i];
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$this->img->Line($xl,$y,$xr,$y);
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$y += $delta;
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}
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break;
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case GRAD_MIDHOR:
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$steps = ceil(abs($yb-$yt)/2);
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$delta = $yb >= $yt ? 1 : -1;
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$this->GetColArray($from_color,$to_color,$steps,$colors,$this->numcolors);
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for($y=$yt, $i=0; $i < $steps; ++$i) {
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$this->img->current_color = $colors[$i];
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$this->img->Line($xl,$y,$xr,$y);
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$y += $delta;
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}
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--$i;
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if( abs($yb-$yt) % 2 == 1 ) --$steps;
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for($j=0; $j < $steps; ++$j, --$i) {
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$this->img->current_color = $colors[$i];
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$this->img->Line($xl,$y,$xr,$y);
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$y += $delta;
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}
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$this->img->Line($xl,$y,$xr,$y);
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break;
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case GRAD_MIDVER:
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$steps = ceil(abs($xr-$xl)/2);
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$delta = $xr>=$xl ? 1 : -1;
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$this->GetColArray($from_color,$to_color,$steps,$colors,$this->numcolors);
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for($x=$xl, $i=0; $i < $steps; ++$i) {
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$this->img->current_color = $colors[$i];
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$this->img->Line($x,$yb,$x,$yt);
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$x += $delta;
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}
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--$i;
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if( abs($xr-$xl) % 2 == 1 ) --$steps;
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for($j=0; $j < $steps; ++$j, --$i) {
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$this->img->current_color = $colors[$i];
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$this->img->Line($x,$yb,$x,$yt);
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$x += $delta;
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}
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$this->img->Line($x,$yb,$x,$yt);
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break;
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case GRAD_WIDE_MIDVER:
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$diff = ceil(abs($xr-$xl));
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$steps = floor(abs($diff)/3);
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$firststep = $diff - 2*$steps ;
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$delta = $xr >= $xl ? 1 : -1;
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$this->GetColArray($from_color,$to_color,$firststep,$colors,$this->numcolors);
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for($x=$xl, $i=0; $i < $firststep; ++$i) {
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$this->img->current_color = $colors[$i];
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$this->img->Line($x,$yb,$x,$yt);
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$x += $delta;
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}
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--$i;
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$this->img->current_color = $colors[$i];
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for($j=0; $j< $steps; ++$j) {
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$this->img->Line($x,$yb,$x,$yt);
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$x += $delta;
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}
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for($j=0; $j < $steps; ++$j, --$i) {
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$this->img->current_color = $colors[$i];
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$this->img->Line($x,$yb,$x,$yt);
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$x += $delta;
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}
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break;
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case GRAD_WIDE_MIDHOR:
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$diff = ceil(abs($yb-$yt));
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$steps = floor(abs($diff)/3);
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$firststep = $diff - 2*$steps ;
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$delta = $yb >= $yt? 1 : -1;
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$this->GetColArray($from_color,$to_color,$firststep,$colors,$this->numcolors);
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for($y=$yt, $i=0; $i < $firststep; ++$i) {
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$this->img->current_color = $colors[$i];
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$this->img->Line($xl,$y,$xr,$y);
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$y += $delta;
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}
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--$i;
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$this->img->current_color = $colors[$i];
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for($j=0; $j < $steps; ++$j) {
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$this->img->Line($xl,$y,$xr,$y);
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$y += $delta;
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}
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for($j=0; $j < $steps; ++$j, --$i) {
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$this->img->current_color = $colors[$i];
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$this->img->Line($xl,$y,$xr,$y);
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$y += $delta;
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}
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break;
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case GRAD_LEFT_REFLECTION:
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$steps1 = ceil(0.3*abs($xr-$xl));
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$delta = $xr>=$xl ? 1 : -1;
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$from_color = $this->img->rgb->Color($from_color);
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$adj = 1.4;
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$m = ($adj-1.0)*(255-min(255,min($from_color[0],min($from_color[1],$from_color[2]))));
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$from_color2 = array(min(255,$from_color[0]+$m),
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min(255,$from_color[1]+$m), min(255,$from_color[2]+$m));
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$this->GetColArray($from_color2,$to_color,$steps1,$colors,$this->numcolors);
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$n = count($colors);
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for($x=$xl, $i=0; $i < $steps1 && $i < $n; ++$i) {
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$this->img->current_color = $colors[$i];
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$this->img->Line($x,$yb,$x,$yt);
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$x += $delta;
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}
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$steps2 = max(1,round(0.08*abs($xr-$xl)));
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$this->img->SetColor($to_color);
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for($j=0; $j< $steps2; ++$j) {
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$this->img->Line($x,$yb,$x,$yt);
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$x += $delta;
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}
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$steps = abs($xr-$xl)-$steps1-$steps2;
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$this->GetColArray($to_color,$from_color,$steps,$colors,$this->numcolors);
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$n = count($colors);
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for($i=0; $i < $steps && $i < $n; ++$i) {
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$this->img->current_color = $colors[$i];
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$this->img->Line($x,$yb,$x,$yt);
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$x += $delta;
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}
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break;
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case GRAD_RIGHT_REFLECTION:
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$steps1 = ceil(0.7*abs($xr-$xl));
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$delta = $xr>=$xl ? 1 : -1;
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$this->GetColArray($from_color,$to_color,$steps1,$colors,$this->numcolors);
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$n = count($colors);
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for($x=$xl, $i=0; $i < $steps1 && $i < $n; ++$i) {
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$this->img->current_color = $colors[$i];
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$this->img->Line($x,$yb,$x,$yt);
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$x += $delta;
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}
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$steps2 = max(1,round(0.08*abs($xr-$xl)));
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$this->img->SetColor($to_color);
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for($j=0; $j< $steps2; ++$j) {
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$this->img->Line($x,$yb,$x,$yt);
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$x += $delta;
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}
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$from_color = $this->img->rgb->Color($from_color);
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$adj = 1.4;
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$m = ($adj-1.0)*(255-min(255,min($from_color[0],min($from_color[1],$from_color[2]))));
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$from_color = array(min(255,$from_color[0]+$m),
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min(255,$from_color[1]+$m), min(255,$from_color[2]+$m));
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$steps = abs($xr-$xl)-$steps1-$steps2;
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$this->GetColArray($to_color,$from_color,$steps,$colors,$this->numcolors);
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$n = count($colors);
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for($i=0; $i < $steps && $i < $n; ++$i) {
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$this->img->current_color = $colors[$i];
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$this->img->Line($x,$yb,$x,$yt);
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$x += $delta;
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}
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break;
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case GRAD_CENTER:
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$steps = ceil(min(($yb-$yt)+1,($xr-$xl)+1)/2);
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$this->GetColArray($from_color,$to_color,$steps,$colors,$this->numcolors);
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$dx = ($xr-$xl)/2;
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$dy = ($yb-$yt)/2;
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$x=$xl;$y=$yt;$x2=$xr;$y2=$yb;
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$n = count($colors);
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for($x=$xl, $i=0; $x < $xl+$dx && $y < $yt+$dy && $i < $n; ++$x, ++$y, --$x2, --$y2, ++$i) {
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$this->img->current_color = $colors[$i];
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$this->img->Rectangle($x,$y,$x2,$y2);
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}
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$this->img->Line($x,$y,$x2,$y2);
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break;
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case GRAD_RAISED_PANEL:
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// right to left
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$steps1 = $xr-$xl;
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$delta = $xr>=$xl ? 1 : -1;
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$this->GetColArray($to_color,$from_color,$steps1,$colors,$this->numcolors);
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$n = count($colors);
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for($x=$xl, $i=0; $i < $steps1 && $i < $n; ++$i) {
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$this->img->current_color = $colors[$i];
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$this->img->Line($x,$yb,$x,$yt);
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$x += $delta;
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}
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// left to right
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$xr -= 3;
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$xl += 3;
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$yb -= 3;
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$yt += 3;
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$steps2 = $xr-$xl;
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$delta = $xr>=$xl ? 1 : -1;
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for($x=$xl, $j=$steps2; $j >= 0; --$j) {
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$this->img->current_color = $colors[$j];
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$this->img->Line($x,$yb,$x,$yt);
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$x += $delta;
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}
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break;
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case GRAD_DIAGONAL:
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// use the longer dimension to determine the required number of steps.
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// first loop draws from one corner to the mid-diagonal and the second
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// loop draws from the mid-diagonal to the opposing corner.
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if($xr-$xl > $yb - $yt) {
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// width is greater than height -> use x-dimension for steps
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$steps = $xr-$xl;
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$delta = $xr>=$xl ? 1 : -1;
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$this->GetColArray($from_color,$to_color,$steps*2,$colors,$this->numcolors);
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$n = count($colors);
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281 |
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282 |
for($x=$xl, $i=0; $i < $steps && $i < $n; ++$i) {
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283 |
$this->img->current_color = $colors[$i];
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284 |
$y = $yt+($i/$steps)*($yb-$yt)*$delta;
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285 |
$this->img->Line($x,$yt,$xl,$y);
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286 |
$x += $delta;
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}
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288 |
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289 |
for($x=$xl, $i = 0; $i < $steps && $i < $n; ++$i) {
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$this->img->current_color = $colors[$steps+$i];
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291 |
$y = $yt+($i/$steps)*($yb-$yt)*$delta;
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$this->img->Line($x,$yb,$xr,$y);
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$x += $delta;
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}
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295 |
} else {
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296 |
// height is greater than width -> use y-dimension for steps
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297 |
$steps = $yb-$yt;
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298 |
$delta = $yb>=$yt ? 1 : -1;
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299 |
$this->GetColArray($from_color,$to_color,$steps*2,$colors,$this->numcolors);
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$n = count($colors);
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302 |
for($y=$yt, $i=0; $i < $steps && $i < $n; ++$i) {
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303 |
$this->img->current_color = $colors[$i];
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304 |
$x = $xl+($i/$steps)*($xr-$xl)*$delta;
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305 |
$this->img->Line($x,$yt,$xl,$y);
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306 |
$y += $delta;
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307 |
}
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308 |
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309 |
for($y=$yt, $i = 0; $i < $steps && $i < $n; ++$i) {
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310 |
$this->img->current_color = $colors[$steps+$i];
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311 |
$x = $xl+($i/$steps)*($xr-$xl)*$delta;
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312 |
$this->img->Line($x,$yb,$xr,$y);
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313 |
$x += $delta;
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314 |
}
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|
|
315 |
|
|
|
316 |
}
|
|
|
317 |
break;
|
|
|
318 |
|
|
|
319 |
default:
|
|
|
320 |
JpGraphError::RaiseL(7001,$style);
|
|
|
321 |
//("Unknown gradient style (=$style).");
|
|
|
322 |
break;
|
|
|
323 |
}
|
|
|
324 |
}
|
|
|
325 |
|
|
|
326 |
// Fill a special case of a polygon with a flat bottom
|
|
|
327 |
// with a gradient. Can be used for filled line plots.
|
|
|
328 |
// Please note that this is NOT a generic gradient polygon fill
|
|
|
329 |
// routine. It assumes that the bottom is flat (like a drawing
|
|
|
330 |
// of a mountain)
|
|
|
331 |
function FilledFlatPolygon($pts,$from_color,$to_color) {
|
|
|
332 |
if( count($pts) == 0 ) return;
|
|
|
333 |
|
|
|
334 |
$maxy=$pts[1];
|
|
|
335 |
$miny=$pts[1];
|
|
|
336 |
$n = count($pts) ;
|
|
|
337 |
for( $i=0, $idx=0; $i < $n; $i += 2) {
|
|
|
338 |
$x = floor($pts[$i]);
|
|
|
339 |
$y = floor($pts[$i+1]);
|
|
|
340 |
$miny = min($miny,$y);
|
|
|
341 |
$maxy = max($maxy,$y);
|
|
|
342 |
}
|
|
|
343 |
|
|
|
344 |
$colors = array();
|
|
|
345 |
$this->GetColArray($from_color,$to_color,abs($maxy-$miny)+1,$colors,$this->numcolors);
|
|
|
346 |
for($i=$miny, $idx=0; $i <= $maxy; ++$i ) {
|
|
|
347 |
$colmap[$i] = $colors[$idx++];
|
|
|
348 |
}
|
|
|
349 |
|
|
|
350 |
$n = count($pts)/2 ;
|
|
|
351 |
$idx = 0 ;
|
|
|
352 |
while( $idx < $n-1 ) {
|
|
|
353 |
$p1 = array(round($pts[$idx*2]),round($pts[$idx*2+1]));
|
|
|
354 |
$p2 = array(round($pts[++$idx*2]),round($pts[$idx*2+1]));
|
|
|
355 |
|
|
|
356 |
// Find the largest rectangle we can fill
|
|
|
357 |
$y = max($p1[1],$p2[1]) ;
|
|
|
358 |
for($yy=$maxy; $yy > $y; --$yy) {
|
|
|
359 |
$this->img->current_color = $colmap[$yy];
|
|
|
360 |
$this->img->Line($p1[0],$yy,$p2[0]-1,$yy);
|
|
|
361 |
}
|
|
|
362 |
|
|
|
363 |
if( $p1[1] == $p2[1] ) continue;
|
|
|
364 |
|
|
|
365 |
// Fill the rest using lines (slow...)
|
|
|
366 |
$slope = ($p2[0]-$p1[0])/($p1[1]-$p2[1]);
|
|
|
367 |
$x1 = $p1[0];
|
|
|
368 |
$x2 = $p2[0]-1;
|
|
|
369 |
$start = $y;
|
|
|
370 |
if( $p1[1] > $p2[1] ) {
|
|
|
371 |
while( $y >= $p2[1] ) {
|
|
|
372 |
$x1=$slope*($start-$y)+$p1[0];
|
|
|
373 |
$this->img->current_color = $colmap[$y];
|
|
|
374 |
$this->img->Line($x1,$y,$x2,$y);
|
|
|
375 |
--$y;
|
|
|
376 |
}
|
|
|
377 |
}
|
|
|
378 |
else {
|
|
|
379 |
while( $y >= $p1[1] ) {
|
|
|
380 |
$x2=$p2[0]+$slope*($start-$y);
|
|
|
381 |
$this->img->current_color = $colmap[$y];
|
|
|
382 |
$this->img->Line($x1,$y,$x2,$y);
|
|
|
383 |
--$y;
|
|
|
384 |
}
|
|
|
385 |
}
|
|
|
386 |
}
|
|
|
387 |
}
|
|
|
388 |
|
|
|
389 |
//---------------
|
|
|
390 |
// PRIVATE METHODS
|
|
|
391 |
// Add to the image color map the necessary colors to do the transition
|
|
|
392 |
// between the two colors using $numcolors intermediate colors
|
|
|
393 |
function GetColArray($from_color,$to_color,$arr_size,&$colors,$numcols=100) {
|
|
|
394 |
if( $arr_size==0 ) return;
|
|
|
395 |
// If color is given as text get it's corresponding r,g,b values
|
|
|
396 |
$from_color = $this->img->rgb->Color($from_color);
|
|
|
397 |
$to_color = $this->img->rgb->Color($to_color);
|
|
|
398 |
|
|
|
399 |
$rdelta=($to_color[0]-$from_color[0])/$numcols;
|
|
|
400 |
$gdelta=($to_color[1]-$from_color[1])/$numcols;
|
|
|
401 |
$bdelta=($to_color[2]-$from_color[2])/$numcols;
|
|
|
402 |
$colorsperstep = $numcols/$arr_size;
|
|
|
403 |
$prevcolnum = -1;
|
|
|
404 |
$from_alpha = $from_color[3];
|
|
|
405 |
$to_alpha = $to_color[3];
|
|
|
406 |
$adelta = ( $to_alpha - $from_alpha ) / $numcols ;
|
|
|
407 |
for ($i=0; $i < $arr_size; ++$i) {
|
|
|
408 |
$colnum = floor($colorsperstep*$i);
|
|
|
409 |
if ( $colnum == $prevcolnum )
|
|
|
410 |
$colors[$i] = $colidx;
|
|
|
411 |
else {
|
|
|
412 |
$r = floor($from_color[0] + $colnum*$rdelta);
|
|
|
413 |
$g = floor($from_color[1] + $colnum*$gdelta);
|
|
|
414 |
$b = floor($from_color[2] + $colnum*$bdelta);
|
|
|
415 |
$alpha = $from_alpha + $colnum*$adelta;
|
|
|
416 |
$colidx = $this->img->rgb->Allocate(sprintf("#%02x%02x%02x",$r,$g,$b),$alpha);
|
|
|
417 |
$colors[$i] = $colidx;
|
|
|
418 |
}
|
|
|
419 |
$prevcolnum = $colnum;
|
|
|
420 |
}
|
|
|
421 |
}
|
|
|
422 |
} // Class
|
|
|
423 |
|
|
|
424 |
?>
|