1 | <?php |
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2 | //======================================================================= |
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3 | // File: JPGRAPH_IMGTRANS.PHP |
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4 | // Description: Extension for JpGraph to do some simple img transformations |
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5 | // Created: 2003-09-06 |
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6 | // Ver: $Id: jpgraph_imgtrans.php 1106 2009-02-22 20:16:35Z 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 | // Class ImgTrans |
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13 | // Perform some simple image transformations. |
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14 | //------------------------------------------------------------------------ |
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15 | class ImgTrans { |
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16 | private $gdImg=null; |
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17 | |
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18 | function __construct($aGdImg) { |
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19 | // Constructor |
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20 | $this->gdImg = $aGdImg; |
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21 | } |
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22 | |
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23 | // -------------------------------------------------------------------- |
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24 | // _TransVert3D() and _TransHor3D() are helper methods to |
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25 | // Skew3D(). |
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26 | // -------------------------------------------------------------------- |
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27 | function _TransVert3D($aGdImg,$aHorizon=100,$aSkewDist=120,$aDir=SKEW3D_DOWN,$aMinSize=true,$aFillColor='#FFFFFF',$aQuality=false,$aBorder=false,$aHorizonPos=0.5) { |
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28 | |
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29 | |
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30 | // Parameter check |
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31 | if( $aHorizonPos < 0 || $aHorizonPos > 1.0 ) { |
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32 | JpGraphError::RaiseL(9001); |
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33 | //("Value for image transformation out of bounds.\nVanishing point on horizon must be specified as a value between 0 and 1."); |
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34 | } |
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35 | |
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36 | $w = imagesx($aGdImg); |
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37 | $h = imagesy($aGdImg); |
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38 | |
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39 | // Create new image |
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40 | $ww = $w; |
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41 | if( $aMinSize ) |
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42 | $hh = ceil($h * $aHorizon / ($aSkewDist+$h)); |
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43 | else |
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44 | $hh = $h; |
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45 | |
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46 | $newgdh = imagecreatetruecolor($ww,$hh); |
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47 | $crgb = new RGB( $newgdh ); |
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48 | $fillColor = $crgb->Allocate($aFillColor); |
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49 | imagefilledrectangle($newgdh,0,0,$ww-1,$hh-1,$fillColor); |
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50 | |
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51 | if( $aBorder ) { |
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52 | $colidx = $crgb->Allocate($aBorder); |
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53 | imagerectangle($newgdh,0,0,$ww-1,$hh-1,$colidx); |
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54 | } |
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55 | |
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56 | $mid = round($w * $aHorizonPos); |
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57 | |
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58 | $last=$h; |
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59 | for($y=0; $y < $h; ++$y) { |
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60 | |
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61 | $yp = $h-$y-1; |
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62 | $yt = floor($yp * $aHorizon / ($aSkewDist + $yp)); |
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63 | |
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64 | if( !$aQuality ) { |
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65 | if( $last <= $yt ) continue ; |
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66 | $last = $yt; |
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67 | } |
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68 | |
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69 | for($x=0; $x < $w; ++$x) { |
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70 | $xt = ($x-$mid) * $aSkewDist / ($aSkewDist + $yp); |
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71 | if( $aDir == SKEW3D_UP ) |
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72 | $rgb = imagecolorat($aGdImg,$x,$h-$y-1); |
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73 | else |
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74 | $rgb = imagecolorat($aGdImg,$x,$y); |
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75 | $r = ($rgb >> 16) & 0xFF; |
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76 | $g = ($rgb >> 8) & 0xFF; |
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77 | $b = $rgb & 0xFF; |
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78 | $colidx = imagecolorallocate($newgdh,$r,$g,$b); |
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79 | $xt = round($xt+$mid); |
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80 | if( $aDir == SKEW3D_UP ) { |
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81 | $syt = $yt; |
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82 | } |
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83 | else { |
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84 | $syt = $hh-$yt-1; |
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85 | } |
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86 | |
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87 | if( !empty($set[$yt]) ) { |
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88 | $nrgb = imagecolorat($newgdh,$xt,$syt); |
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89 | $nr = ($nrgb >> 16) & 0xFF; |
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90 | $ng = ($nrgb >> 8) & 0xFF; |
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91 | $nb = $nrgb & 0xFF; |
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92 | $colidx = imagecolorallocate($newgdh,floor(($r+$nr)/2), |
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93 | floor(($g+$ng)/2),floor(($b+$nb)/2)); |
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94 | } |
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95 | |
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96 | imagesetpixel($newgdh,$xt,$syt,$colidx); |
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97 | } |
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98 | |
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99 | $set[$yt] = true; |
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100 | } |
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101 | |
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102 | return $newgdh; |
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103 | } |
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104 | |
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105 | // -------------------------------------------------------------------- |
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106 | // _TransVert3D() and _TransHor3D() are helper methods to |
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107 | // Skew3D(). |
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108 | // -------------------------------------------------------------------- |
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109 | function _TransHor3D($aGdImg,$aHorizon=100,$aSkewDist=120,$aDir=SKEW3D_LEFT,$aMinSize=true,$aFillColor='#FFFFFF',$aQuality=false,$aBorder=false,$aHorizonPos=0.5) { |
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110 | |
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111 | $w = imagesx($aGdImg); |
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112 | $h = imagesy($aGdImg); |
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113 | |
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114 | // Create new image |
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115 | $hh = $h; |
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116 | if( $aMinSize ) |
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117 | $ww = ceil($w * $aHorizon / ($aSkewDist+$w)); |
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118 | else |
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119 | $ww = $w; |
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120 | |
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121 | $newgdh = imagecreatetruecolor($ww,$hh); |
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122 | $crgb = new RGB( $newgdh ); |
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123 | $fillColor = $crgb->Allocate($aFillColor); |
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124 | imagefilledrectangle($newgdh,0,0,$ww-1,$hh-1,$fillColor); |
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125 | |
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126 | if( $aBorder ) { |
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127 | $colidx = $crgb->Allocate($aBorder); |
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128 | imagerectangle($newgdh,0,0,$ww-1,$hh-1,$colidx); |
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129 | } |
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130 | |
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131 | $mid = round($h * $aHorizonPos); |
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132 | |
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133 | $last = -1; |
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134 | for($x=0; $x < $w-1; ++$x) { |
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135 | $xt = floor($x * $aHorizon / ($aSkewDist + $x)); |
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136 | if( !$aQuality ) { |
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137 | if( $last >= $xt ) continue ; |
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138 | $last = $xt; |
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139 | } |
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140 | |
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141 | for($y=0; $y < $h; ++$y) { |
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142 | $yp = $h-$y-1; |
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143 | $yt = ($yp-$mid) * $aSkewDist / ($aSkewDist + $x); |
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144 | |
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145 | if( $aDir == SKEW3D_RIGHT ) |
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146 | $rgb = imagecolorat($aGdImg,$w-$x-1,$y); |
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147 | else |
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148 | $rgb = imagecolorat($aGdImg,$x,$y); |
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149 | $r = ($rgb >> 16) & 0xFF; |
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150 | $g = ($rgb >> 8) & 0xFF; |
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151 | $b = $rgb & 0xFF; |
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152 | $colidx = imagecolorallocate($newgdh,$r,$g,$b); |
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153 | $yt = floor($hh-$yt-$mid-1); |
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154 | if( $aDir == SKEW3D_RIGHT ) { |
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155 | $sxt = $ww-$xt-1; |
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156 | } |
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157 | else |
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158 | $sxt = $xt ; |
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159 | |
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160 | if( !empty($set[$xt]) ) { |
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161 | $nrgb = imagecolorat($newgdh,$sxt,$yt); |
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162 | $nr = ($nrgb >> 16) & 0xFF; |
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163 | $ng = ($nrgb >> 8) & 0xFF; |
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164 | $nb = $nrgb & 0xFF; |
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165 | $colidx = imagecolorallocate($newgdh,floor(($r+$nr)/2), |
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166 | floor(($g+$ng)/2),floor(($b+$nb)/2)); |
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167 | } |
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168 | imagesetpixel($newgdh,$sxt,$yt,$colidx); |
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169 | } |
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170 | |
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171 | $set[$xt] = true; |
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172 | } |
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173 | |
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174 | return $newgdh; |
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175 | } |
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176 | |
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177 | // -------------------------------------------------------------------- |
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178 | // Skew image for the apperance of a 3D effect |
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179 | // This transforms an image into a 3D-skewed version |
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180 | // of the image. The transformation is specified by giving the height |
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181 | // of the artificial horizon and specifying a "skew" factor which |
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182 | // is the distance on the horizon line between the point of |
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183 | // convergence and perspective line. |
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184 | // |
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185 | // The function returns the GD handle of the transformed image |
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186 | // leaving the original image untouched. |
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187 | // |
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188 | // Parameters: |
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189 | // * $aGdImg, GD handle to the image to be transformed |
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190 | // * $aHorizon, Distance to the horizon |
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191 | // * $aSkewDist, Distance from the horizon point of convergence |
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192 | // on the horizon line to the perspective points. A larger |
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193 | // value will fore-shorten the image more |
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194 | // * $aDir, parameter specifies type of convergence. This of this |
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195 | // as the walls in a room you are looking at. This specifies if the |
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196 | // image should be applied on the left,right,top or bottom walls. |
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197 | // * $aMinSize, true=make the new image just as big as needed, |
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198 | // false = keep the image the same size as the original image |
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199 | // * $aFillColor, Background fill color in the image |
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200 | // * $aHiQuality, true=performa some interpolation that improves |
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201 | // the image quality but at the expense of performace. Enabling |
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202 | // high quality will have a dramatic effect on the time it takes |
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203 | // to transform an image. |
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204 | // * $aBorder, if set to anything besides false this will draw a |
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205 | // a border of the speciied color around the image |
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206 | // -------------------------------------------------------------------- |
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207 | function Skew3D($aHorizon=120,$aSkewDist=150,$aDir=SKEW3D_DOWN,$aHiQuality=false,$aMinSize=true,$aFillColor='#FFFFFF',$aBorder=false) { |
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208 | return $this->_Skew3D($this->gdImg,$aHorizon,$aSkewDist,$aDir,$aHiQuality, |
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209 | $aMinSize,$aFillColor,$aBorder); |
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210 | } |
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211 | |
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212 | function _Skew3D($aGdImg,$aHorizon=120,$aSkewDist=150,$aDir=SKEW3D_DOWN,$aHiQuality=false,$aMinSize=true,$aFillColor='#FFFFFF',$aBorder=false) { |
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213 | if( $aDir == SKEW3D_DOWN || $aDir == SKEW3D_UP ) |
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214 | return $this->_TransVert3D($aGdImg,$aHorizon,$aSkewDist,$aDir,$aMinSize,$aFillColor,$aHiQuality,$aBorder); |
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215 | else |
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216 | return $this->_TransHor3D($aGdImg,$aHorizon,$aSkewDist,$aDir,$aMinSize,$aFillColor,$aHiQuality,$aBorder); |
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217 | |
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218 | } |
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219 | |
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220 | } |
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221 | |
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222 | |
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223 | ?> |
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