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377 lines
12 KiB
PHP
377 lines
12 KiB
PHP
<?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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// Author: Johan Persson (johanp@aditus.nu)
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// Ver: $Id: jpgraph_gradient.php,v 1.1 2006/07/07 13:37:14 powles Exp $
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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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//===================================================
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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 = round(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 = round(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 = round(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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$steps = round(abs($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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$diff = round(abs($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 = round(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 = round(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 = round(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 += $delta;
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}
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break;
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default:
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JpGraphError::RaiseL(7001,$style);
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//("Unknown gradient style (=$style).");
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break;
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}
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}
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// Fill a special case of a polygon with a flat bottom
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// with a gradient. Can be used for filled line plots.
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// Please note that this is NOT a generic gradient polygon fill
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// routine. It assumes that the bottom is flat (like a drawing
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// of a mountain)
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function FilledFlatPolygon($pts,$from_color,$to_color) {
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if( count($pts) == 0 ) return;
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$maxy=$pts[1];
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$miny=$pts[1];
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$n = count($pts) ;
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for( $i=0, $idx=0; $i < $n; $i += 2) {
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$x = round($pts[$i]);
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$y = round($pts[$i+1]);
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$miny = min($miny,$y);
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$maxy = max($maxy,$y);
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}
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$colors = array();
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$this->GetColArray($from_color,$to_color,abs($maxy-$miny)+1,$colors,$this->numcolors);
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for($i=$miny, $idx=0; $i <= $maxy; ++$i ) {
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$colmap[$i] = $colors[$idx++];
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}
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$n = count($pts)/2 ;
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$idx = 0 ;
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while( $idx < $n-1 ) {
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$p1 = array(round($pts[$idx*2]),round($pts[$idx*2+1]));
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$p2 = array(round($pts[++$idx*2]),round($pts[$idx*2+1]));
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// Find the largest rectangle we can fill
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$y = max($p1[1],$p2[1]) ;
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for($yy=$maxy; $yy > $y; --$yy) {
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$this->img->current_color = $colmap[$yy];
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$this->img->Line($p1[0],$yy,$p2[0]-1,$yy);
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}
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if( $p1[1] == $p2[1] ) continue;
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// Fill the rest using lines (slow...)
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$slope = ($p2[0]-$p1[0])/($p1[1]-$p2[1]);
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$x1 = $p1[0];
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$x2 = $p2[0]; //-1;
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$start = $y;
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if( $p1[1] > $p2[1] ) {
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while( $y >= $p2[1] ) {
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$x1=$slope*($start-$y)+$p1[0];
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$this->img->current_color = $colmap[$y];
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$this->img->Line($x1,$y,$x2,$y);
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--$y;
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}
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}
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else {
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while( $y >= $p1[1] ) {
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$x2=$p2[0]+$slope*($start-$y);
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$this->img->current_color = $colmap[$y];
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$this->img->Line($x1,$y,$x2,$y);
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--$y;
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}
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}
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}
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}
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//---------------
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// PRIVATE METHODS
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// Add to the image color map the necessary colors to do the transition
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// between the two colors using $numcolors intermediate colors
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function GetColArray($from_color,$to_color,$arr_size,&$colors,$numcols=100) {
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if( $arr_size==0 ) return;
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// If color is given as text get it's corresponding r,g,b values
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$from_color = $this->img->rgb->Color($from_color);
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$to_color = $this->img->rgb->Color($to_color);
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$rdelta=($to_color[0]-$from_color[0])/$numcols;
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$gdelta=($to_color[1]-$from_color[1])/$numcols;
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$bdelta=($to_color[2]-$from_color[2])/$numcols;
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$colorsperstep = $numcols/$arr_size;
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$prevcolnum = -1;
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$from_alpha = $from_color[3];
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$to_alpha = $to_color[3];
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$adelta = ( $to_alpha - $from_alpha ) / $numcols ;
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for ($i=0; $i < $arr_size; ++$i) {
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$colnum = floor($colorsperstep*$i);
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if ( $colnum == $prevcolnum )
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$colors[$i] = $colidx;
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else {
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$r = floor($from_color[0] + $colnum*$rdelta);
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$g = floor($from_color[1] + $colnum*$gdelta);
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$b = floor($from_color[2] + $colnum*$bdelta);
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$alpha = $from_alpha + $colnum*$adelta;
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$colidx = $this->img->rgb->Allocate(sprintf("#%02x%02x%02x",$r,$g,$b),$alpha);
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$colors[$i] = $colidx;
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}
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$prevcolnum = $colnum;
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}
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}
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} // Class
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?>
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