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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