<?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,v 1.1 2006/07/07 13:37:14 powles Exp $ // // 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 += $delta; } break; default: JpGraphError::RaiseL(7001,$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 ?>