[42] | 1 | <?php |
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| 2 | /*======================================================================= |
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| 3 | // File: JPGRAPH_GRADIENT.PHP |
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| 4 | // Description: Create a color gradient |
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| 5 | // Created: 2003-02-01 |
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| 6 | // Ver: $Id: jpgraph_gradient.php 1761 2009-08-01 08:31:28Z ljp $ |
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| 7 | // |
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| 8 | // Copyright (c) Asial Corporation. All rights reserved. |
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| 9 | //======================================================================== |
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| 10 | */ |
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| 11 | |
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| 12 | // Styles for gradient color fill |
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| 13 | define("GRAD_VER",1); |
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| 14 | define("GRAD_VERT",1); |
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| 15 | define("GRAD_HOR",2); |
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| 16 | define("GRAD_MIDHOR",3); |
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| 17 | define("GRAD_MIDVER",4); |
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| 18 | define("GRAD_CENTER",5); |
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| 19 | define("GRAD_WIDE_MIDVER",6); |
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| 20 | define("GRAD_WIDE_MIDHOR",7); |
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| 21 | define("GRAD_LEFT_REFLECTION",8); |
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| 22 | define("GRAD_RIGHT_REFLECTION",9); |
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| 23 | define("GRAD_RAISED_PANEL",10); |
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| 24 | define("GRAD_DIAGONAL",11); |
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| 25 | |
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| 26 | //=================================================== |
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| 27 | // CLASS Gradient |
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| 28 | // Description: Handles gradient fills. This is to be |
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| 29 | // considered a "friend" class of Class Image. |
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| 30 | //=================================================== |
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| 31 | class Gradient { |
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| 32 | private $img=null, $numcolors=100; |
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| 33 | //--------------- |
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| 34 | // CONSTRUCTOR |
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| 35 | function __construct(&$img) { |
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| 36 | $this->img = $img; |
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| 37 | } |
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| 38 | |
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| 39 | |
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| 40 | function SetNumColors($aNum) { |
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| 41 | $this->numcolors=$aNum; |
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| 42 | } |
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| 43 | //--------------- |
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| 44 | // PUBLIC METHODS |
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| 45 | // Produce a gradient filled rectangle with a smooth transition between |
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| 46 | // two colors. |
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| 47 | // ($xl,$yt) Top left corner |
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| 48 | // ($xr,$yb) Bottom right |
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| 49 | // $from_color Starting color in gradient |
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| 50 | // $to_color End color in the gradient |
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| 51 | // $style Which way is the gradient oriented? |
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| 52 | function FilledRectangle($xl,$yt,$xr,$yb,$from_color,$to_color,$style=1) { |
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| 53 | $this->img->SetLineWeight(1); |
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| 54 | switch( $style ) { |
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| 55 | case GRAD_VER: |
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| 56 | $steps = ceil(abs($xr-$xl)+1); |
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| 57 | $delta = $xr>=$xl ? 1 : -1; |
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| 58 | $this->GetColArray($from_color,$to_color,$steps,$colors,$this->numcolors); |
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| 59 | for( $i=0, $x=$xl; $i < $steps; ++$i ) { |
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| 60 | $this->img->current_color = $colors[$i]; |
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| 61 | $this->img->Line($x,$yt,$x,$yb); |
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| 62 | $x += $delta; |
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| 63 | } |
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| 64 | break; |
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| 65 | |
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| 66 | case GRAD_HOR: |
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| 67 | $steps = ceil(abs($yb-$yt)+1); |
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| 68 | $delta = $yb >= $yt ? 1 : -1; |
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| 69 | $this->GetColArray($from_color,$to_color,$steps,$colors,$this->numcolors); |
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| 70 | for($i=0,$y=$yt; $i < $steps; ++$i) { |
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| 71 | $this->img->current_color = $colors[$i]; |
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| 72 | $this->img->Line($xl,$y,$xr,$y); |
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| 73 | $y += $delta; |
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| 74 | } |
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| 75 | break; |
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| 76 | |
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| 77 | case GRAD_MIDHOR: |
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| 78 | $steps = ceil(abs($yb-$yt)/2); |
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| 79 | $delta = $yb >= $yt ? 1 : -1; |
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| 80 | $this->GetColArray($from_color,$to_color,$steps,$colors,$this->numcolors); |
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| 81 | for($y=$yt, $i=0; $i < $steps; ++$i) { |
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| 82 | $this->img->current_color = $colors[$i]; |
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| 83 | $this->img->Line($xl,$y,$xr,$y); |
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| 84 | $y += $delta; |
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| 85 | } |
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| 86 | --$i; |
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| 87 | if( abs($yb-$yt) % 2 == 1 ) { |
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| 88 | --$steps; |
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| 89 | } |
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| 90 | for($j=0; $j < $steps; ++$j, --$i) { |
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| 91 | $this->img->current_color = $colors[$i]; |
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| 92 | $this->img->Line($xl,$y,$xr,$y); |
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| 93 | $y += $delta; |
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| 94 | } |
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| 95 | $this->img->Line($xl,$y,$xr,$y); |
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| 96 | break; |
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| 97 | |
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| 98 | case GRAD_MIDVER: |
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| 99 | $steps = ceil(abs($xr-$xl)/2); |
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| 100 | $delta = $xr>=$xl ? 1 : -1; |
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| 101 | $this->GetColArray($from_color,$to_color,$steps,$colors,$this->numcolors); |
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| 102 | for($x=$xl, $i=0; $i < $steps; ++$i) { |
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| 103 | $this->img->current_color = $colors[$i]; |
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| 104 | $this->img->Line($x,$yb,$x,$yt); |
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| 105 | $x += $delta; |
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| 106 | } |
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| 107 | --$i; |
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| 108 | if( abs($xr-$xl) % 2 == 1 ) { |
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| 109 | --$steps; |
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| 110 | } |
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| 111 | for($j=0; $j < $steps; ++$j, --$i) { |
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| 112 | $this->img->current_color = $colors[$i]; |
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| 113 | $this->img->Line($x,$yb,$x,$yt); |
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| 114 | $x += $delta; |
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| 115 | } |
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| 116 | $this->img->Line($x,$yb,$x,$yt); |
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| 117 | break; |
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| 118 | |
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| 119 | case GRAD_WIDE_MIDVER: |
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| 120 | $diff = ceil(abs($xr-$xl)); |
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| 121 | $steps = floor(abs($diff)/3); |
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| 122 | $firststep = $diff - 2*$steps ; |
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| 123 | $delta = $xr >= $xl ? 1 : -1; |
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| 124 | $this->GetColArray($from_color,$to_color,$firststep,$colors,$this->numcolors); |
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| 125 | for($x=$xl, $i=0; $i < $firststep; ++$i) { |
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| 126 | $this->img->current_color = $colors[$i]; |
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| 127 | $this->img->Line($x,$yb,$x,$yt); |
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| 128 | $x += $delta; |
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| 129 | } |
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| 130 | --$i; |
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| 131 | $this->img->current_color = $colors[$i]; |
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| 132 | for($j=0; $j< $steps; ++$j) { |
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| 133 | $this->img->Line($x,$yb,$x,$yt); |
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| 134 | $x += $delta; |
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| 135 | } |
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| 136 | |
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| 137 | for($j=0; $j < $steps; ++$j, --$i) { |
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| 138 | $this->img->current_color = $colors[$i]; |
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| 139 | $this->img->Line($x,$yb,$x,$yt); |
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| 140 | $x += $delta; |
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| 141 | } |
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| 142 | break; |
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| 143 | |
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| 144 | case GRAD_WIDE_MIDHOR: |
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| 145 | $diff = ceil(abs($yb-$yt)); |
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| 146 | $steps = floor(abs($diff)/3); |
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| 147 | $firststep = $diff - 2*$steps ; |
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| 148 | $delta = $yb >= $yt? 1 : -1; |
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| 149 | $this->GetColArray($from_color,$to_color,$firststep,$colors,$this->numcolors); |
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| 150 | for($y=$yt, $i=0; $i < $firststep; ++$i) { |
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| 151 | $this->img->current_color = $colors[$i]; |
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| 152 | $this->img->Line($xl,$y,$xr,$y); |
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| 153 | $y += $delta; |
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| 154 | } |
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| 155 | --$i; |
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| 156 | $this->img->current_color = $colors[$i]; |
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| 157 | for($j=0; $j < $steps; ++$j) { |
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| 158 | $this->img->Line($xl,$y,$xr,$y); |
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| 159 | $y += $delta; |
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| 160 | } |
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| 161 | for($j=0; $j < $steps; ++$j, --$i) { |
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| 162 | $this->img->current_color = $colors[$i]; |
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| 163 | $this->img->Line($xl,$y,$xr,$y); |
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| 164 | $y += $delta; |
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| 165 | } |
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| 166 | break; |
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| 167 | |
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| 168 | case GRAD_LEFT_REFLECTION: |
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| 169 | $steps1 = ceil(0.3*abs($xr-$xl)); |
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| 170 | $delta = $xr>=$xl ? 1 : -1; |
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| 171 | |
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| 172 | $from_color = $this->img->rgb->Color($from_color); |
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| 173 | $adj = 1.4; |
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| 174 | $m = ($adj-1.0)*(255-min(255,min($from_color[0],min($from_color[1],$from_color[2])))); |
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| 175 | $from_color2 = array(min(255,$from_color[0]+$m), |
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| 176 | min(255,$from_color[1]+$m), min(255,$from_color[2]+$m)); |
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| 177 | |
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| 178 | $this->GetColArray($from_color2,$to_color,$steps1,$colors,$this->numcolors); |
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| 179 | $n = count($colors); |
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| 180 | for($x=$xl, $i=0; $i < $steps1 && $i < $n; ++$i) { |
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| 181 | $this->img->current_color = $colors[$i]; |
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| 182 | $this->img->Line($x,$yb,$x,$yt); |
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| 183 | $x += $delta; |
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| 184 | } |
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| 185 | $steps2 = max(1,ceil(0.08*abs($xr-$xl))); |
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| 186 | $this->img->SetColor($to_color); |
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| 187 | for($j=0; $j< $steps2; ++$j) { |
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| 188 | $this->img->Line($x,$yb,$x,$yt); |
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| 189 | $x += $delta; |
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| 190 | } |
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| 191 | $steps = abs($xr-$xl)-$steps1-$steps2; |
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| 192 | $this->GetColArray($to_color,$from_color,$steps,$colors,$this->numcolors); |
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| 193 | $n = count($colors); |
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| 194 | for($i=0; $i < $steps && $i < $n; ++$i) { |
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| 195 | $this->img->current_color = $colors[$i]; |
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| 196 | $this->img->Line($x,$yb,$x,$yt); |
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| 197 | $x += $delta; |
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| 198 | } |
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| 199 | break; |
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| 200 | |
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| 201 | case GRAD_RIGHT_REFLECTION: |
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| 202 | $steps1 = ceil(0.7*abs($xr-$xl)); |
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| 203 | $delta = $xr>=$xl ? 1 : -1; |
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| 204 | |
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| 205 | $this->GetColArray($from_color,$to_color,$steps1,$colors,$this->numcolors); |
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| 206 | $n = count($colors); |
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| 207 | for($x=$xl, $i=0; $i < $steps1 && $i < $n; ++$i) { |
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| 208 | $this->img->current_color = $colors[$i]; |
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| 209 | $this->img->Line($x,$yb,$x,$yt); |
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| 210 | $x += $delta; |
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| 211 | } |
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| 212 | $steps2 = max(1,ceil(0.08*abs($xr-$xl))); |
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| 213 | $this->img->SetColor($to_color); |
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| 214 | for($j=0; $j< $steps2; ++$j) { |
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| 215 | $this->img->Line($x,$yb,$x,$yt); |
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| 216 | $x += $delta; |
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| 217 | } |
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| 218 | |
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| 219 | $from_color = $this->img->rgb->Color($from_color); |
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| 220 | $adj = 1.4; |
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| 221 | $m = ($adj-1.0)*(255-min(255,min($from_color[0],min($from_color[1],$from_color[2])))); |
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| 222 | $from_color = array(min(255,$from_color[0]+$m), |
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| 223 | min(255,$from_color[1]+$m), min(255,$from_color[2]+$m)); |
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| 224 | |
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| 225 | $steps = abs($xr-$xl)-$steps1-$steps2; |
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| 226 | $this->GetColArray($to_color,$from_color,$steps,$colors,$this->numcolors); |
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| 227 | $n = count($colors); |
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| 228 | for($i=0; $i < $steps && $i < $n; ++$i) { |
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| 229 | $this->img->current_color = $colors[$i]; |
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| 230 | $this->img->Line($x,$yb,$x,$yt); |
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| 231 | $x += $delta; |
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| 232 | } |
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| 233 | break; |
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| 234 | |
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| 235 | case GRAD_CENTER: |
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| 236 | $steps = ceil(min(($yb-$yt)+1,($xr-$xl)+1)/2); |
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| 237 | $this->GetColArray($from_color,$to_color,$steps,$colors,$this->numcolors); |
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| 238 | $dx = ($xr-$xl)/2; |
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| 239 | $dy = ($yb-$yt)/2; |
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| 240 | $x=$xl;$y=$yt;$x2=$xr;$y2=$yb; |
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| 241 | $n = count($colors); |
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| 242 | for($x=$xl, $i=0; $x < $xl+$dx && $y < $yt+$dy && $i < $n; ++$x, ++$y, --$x2, --$y2, ++$i) { |
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| 243 | $this->img->current_color = $colors[$i]; |
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| 244 | $this->img->Rectangle($x,$y,$x2,$y2); |
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| 245 | } |
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| 246 | $this->img->Line($x,$y,$x2,$y2); |
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| 247 | break; |
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| 248 | |
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| 249 | case GRAD_RAISED_PANEL: |
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| 250 | // right to left |
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| 251 | $steps1 = $xr-$xl; |
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| 252 | $delta = $xr>=$xl ? 1 : -1; |
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| 253 | $this->GetColArray($to_color,$from_color,$steps1,$colors,$this->numcolors); |
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| 254 | $n = count($colors); |
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| 255 | for($x=$xl, $i=0; $i < $steps1 && $i < $n; ++$i) { |
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| 256 | $this->img->current_color = $colors[$i]; |
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| 257 | $this->img->Line($x,$yb,$x,$yt); |
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| 258 | $x += $delta; |
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| 259 | } |
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| 260 | |
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| 261 | // left to right |
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| 262 | $xr -= 3; |
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| 263 | $xl += 3; |
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| 264 | $yb -= 3; |
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| 265 | $yt += 3; |
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| 266 | $steps2 = $xr-$xl; |
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| 267 | $delta = $xr>=$xl ? 1 : -1; |
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| 268 | for($x=$xl, $j=$steps2; $j >= 0; --$j) { |
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| 269 | $this->img->current_color = $colors[$j]; |
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| 270 | $this->img->Line($x,$yb,$x,$yt); |
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| 271 | $x += $delta; |
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| 272 | } |
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| 273 | break; |
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| 274 | |
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| 275 | case GRAD_DIAGONAL: |
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| 276 | // use the longer dimension to determine the required number of steps. |
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| 277 | // first loop draws from one corner to the mid-diagonal and the second |
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| 278 | // loop draws from the mid-diagonal to the opposing corner. |
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| 279 | if($xr-$xl > $yb - $yt) { |
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| 280 | // width is greater than height -> use x-dimension for steps |
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| 281 | $steps = $xr-$xl; |
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| 282 | $delta = $xr>=$xl ? 1 : -1; |
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| 283 | $this->GetColArray($from_color,$to_color,$steps*2,$colors,$this->numcolors); |
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| 284 | $n = count($colors); |
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| 285 | |
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| 286 | for($x=$xl, $i=0; $i < $steps && $i < $n; ++$i) { |
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| 287 | $this->img->current_color = $colors[$i]; |
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| 288 | $y = $yt+($i/$steps)*($yb-$yt)*$delta; |
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| 289 | $this->img->Line($x,$yt,$xl,$y); |
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| 290 | $x += $delta; |
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| 291 | } |
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| 292 | |
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| 293 | for($x=$xl, $i = 0; $i < $steps && $i < $n; ++$i) { |
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| 294 | $this->img->current_color = $colors[$steps+$i]; |
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| 295 | $y = $yt+($i/$steps)*($yb-$yt)*$delta; |
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| 296 | $this->img->Line($x,$yb,$xr,$y); |
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| 297 | $x += $delta; |
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| 298 | } |
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| 299 | } else { |
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| 300 | // height is greater than width -> use y-dimension for steps |
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| 301 | $steps = $yb-$yt; |
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| 302 | $delta = $yb>=$yt ? 1 : -1; |
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| 303 | $this->GetColArray($from_color,$to_color,$steps*2,$colors,$this->numcolors); |
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| 304 | $n = count($colors); |
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| 305 | |
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| 306 | for($y=$yt, $i=0; $i < $steps && $i < $n; ++$i) { |
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| 307 | $this->img->current_color = $colors[$i]; |
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| 308 | $x = $xl+($i/$steps)*($xr-$xl)*$delta; |
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| 309 | $this->img->Line($x,$yt,$xl,$y); |
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| 310 | $y += $delta; |
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| 311 | } |
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| 312 | |
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| 313 | for($y=$yt, $i = 0; $i < $steps && $i < $n; ++$i) { |
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| 314 | $this->img->current_color = $colors[$steps+$i]; |
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| 315 | $x = $xl+($i/$steps)*($xr-$xl)*$delta; |
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| 316 | $this->img->Line($x,$yb,$xr,$y); |
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| 317 | $x += $delta; |
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| 318 | } |
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| 319 | |
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| 320 | } |
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| 321 | break; |
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| 322 | |
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| 323 | default: |
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| 324 | JpGraphError::RaiseL(7001,$style); |
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| 325 | //("Unknown gradient style (=$style)."); |
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| 326 | break; |
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| 327 | } |
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| 328 | } |
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| 329 | |
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| 330 | // Fill a special case of a polygon with a flat bottom |
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| 331 | // with a gradient. Can be used for filled line plots. |
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| 332 | // Please note that this is NOT a generic gradient polygon fill |
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| 333 | // routine. It assumes that the bottom is flat (like a drawing |
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| 334 | // of a mountain) |
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| 335 | function FilledFlatPolygon($pts,$from_color,$to_color) { |
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| 336 | if( count($pts) == 0 ) return; |
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| 337 | |
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| 338 | $maxy=$pts[1]; |
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| 339 | $miny=$pts[1]; |
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| 340 | $n = count($pts) ; |
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| 341 | for( $i=0, $idx=0; $i < $n; $i += 2) { |
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| 342 | $x = round($pts[$i]); |
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| 343 | $y = round($pts[$i+1]); |
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| 344 | $miny = min($miny,$y); |
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| 345 | $maxy = max($maxy,$y); |
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| 346 | } |
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| 347 | |
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| 348 | $colors = array(); |
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| 349 | $this->GetColArray($from_color,$to_color,abs($maxy-$miny)+1,$colors,$this->numcolors); |
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| 350 | for($i=$miny, $idx=0; $i <= $maxy; ++$i ) { |
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| 351 | $colmap[$i] = $colors[$idx++]; |
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| 352 | } |
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| 353 | |
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| 354 | $n = count($pts)/2 ; |
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| 355 | $idx = 0 ; |
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| 356 | while( $idx < $n-1 ) { |
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| 357 | $p1 = array(round($pts[$idx*2]),round($pts[$idx*2+1])); |
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| 358 | $p2 = array(round($pts[++$idx*2]),round($pts[$idx*2+1])); |
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| 359 | |
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| 360 | // Find the largest rectangle we can fill |
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| 361 | $y = max($p1[1],$p2[1]) ; |
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| 362 | for($yy=$maxy; $yy > $y; --$yy) { |
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| 363 | $this->img->current_color = $colmap[$yy]; |
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| 364 | $this->img->Line($p1[0],$yy,$p2[0]-1,$yy); |
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| 365 | } |
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| 366 | |
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| 367 | if( $p1[1] == $p2[1] ) { |
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| 368 | continue; |
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| 369 | } |
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| 370 | |
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| 371 | // Fill the rest using lines (slow...) |
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| 372 | $slope = ($p2[0]-$p1[0])/($p1[1]-$p2[1]); |
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| 373 | $x1 = $p1[0]; |
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| 374 | $x2 = $p2[0]-1; |
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| 375 | $start = $y; |
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| 376 | if( $p1[1] > $p2[1] ) { |
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| 377 | while( $y >= $p2[1] ) { |
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| 378 | $x1=$slope*($start-$y)+$p1[0]; |
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| 379 | $this->img->current_color = $colmap[$y]; |
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| 380 | $this->img->Line($x1,$y,$x2,$y); |
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| 381 | --$y; |
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| 382 | } |
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| 383 | } |
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| 384 | else { |
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| 385 | while( $y >= $p1[1] ) { |
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| 386 | $x2=$p2[0]+$slope*($start-$y); |
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| 387 | $this->img->current_color = $colmap[$y]; |
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| 388 | $this->img->Line($x1,$y,$x2,$y); |
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| 389 | --$y; |
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| 390 | } |
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| 391 | } |
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| 392 | } |
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| 393 | } |
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| 394 | |
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| 395 | //--------------- |
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| 396 | // PRIVATE METHODS |
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| 397 | // Add to the image color map the necessary colors to do the transition |
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| 398 | // between the two colors using $numcolors intermediate colors |
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| 399 | function GetColArray($from_color,$to_color,$arr_size,&$colors,$numcols=100) { |
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| 400 | if( $arr_size==0 ) { |
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| 401 | return; |
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| 402 | } |
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| 403 | |
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| 404 | // If color is given as text get it's corresponding r,g,b values |
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| 405 | $from_color = $this->img->rgb->Color($from_color); |
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| 406 | $to_color = $this->img->rgb->Color($to_color); |
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| 407 | |
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| 408 | $rdelta=($to_color[0]-$from_color[0])/$numcols; |
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| 409 | $gdelta=($to_color[1]-$from_color[1])/$numcols; |
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| 410 | $bdelta=($to_color[2]-$from_color[2])/$numcols; |
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| 411 | $colorsperstep = $numcols/$arr_size; |
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| 412 | $prevcolnum = -1; |
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| 413 | $from_alpha = $from_color[3]; |
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| 414 | $to_alpha = $to_color[3]; |
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| 415 | $adelta = ( $to_alpha - $from_alpha ) / $numcols ; |
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| 416 | for ($i=0; $i < $arr_size; ++$i) { |
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| 417 | $colnum = floor($colorsperstep*$i); |
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| 418 | if ( $colnum == $prevcolnum ) { |
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| 419 | $colors[$i] = $colidx; |
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| 420 | } |
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| 421 | else { |
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| 422 | $r = floor($from_color[0] + $colnum*$rdelta); |
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| 423 | $g = floor($from_color[1] + $colnum*$gdelta); |
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| 424 | $b = floor($from_color[2] + $colnum*$bdelta); |
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| 425 | $alpha = $from_alpha + $colnum*$adelta; |
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| 426 | $colidx = $this->img->rgb->Allocate(sprintf("#%02x%02x%02x",$r,$g,$b),$alpha); |
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| 427 | $colors[$i] = $colidx; |
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| 428 | } |
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| 429 | $prevcolnum = $colnum; |
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| 430 | } |
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| 431 | } |
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| 432 | } // Class |
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| 433 | |
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| 434 | ?> |
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