1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 | <?php /* *DISCLAIMER * http://blog.gmapify.fr/create-beautiful-tiled-heat-maps-with-php-and-gd *THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES *OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, *INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF *USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT *(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * @author: Olivier G. <olbibigo_AT_gmail_DOT_com> * @version: 1.0 * @history: * 1.0 creation */ define('PI2', 2*M_PI); class HeatMapPoint{ public $x,$y; function __construct($x,$y) { $this->x = $x; $this->y = $y; } function __toString() { return "({$this->x},{$this->y})"; } }//Point class HeatMap{ //TRANSPARENCY public static $WITH_ALPHA = 0; public static $WITH_TRANSPARENCY = 1; //GRADIENT STYLE public static $GRADIENT_CLASSIC = 'classic'; public static $GRADIENT_FIRE = 'fire'; public static $GRADIENT_PGAITCH = 'pgaitch'; //GRADIENT MODE (for heatImage) public static $GRADIENT_NO_NEGATE_NO_INTERPOLATE = 0; public static $GRADIENT_NO_NEGATE_INTERPOLATE = 1; public static $GRADIENT_NEGATE_NO_INTERPOLATE = 2; public static $GRADIENT_NEGATE_INTERPOLATE = 3; //NOT PROCESSED PIXEL (for heatImage) public static $KEEP_VALUE = 0; public static $NO_KEEP_VALUE = 1; //CONSTRAINTS private static $MIN_RADIUS = 2;//in px private static $MAX_RADIUS = 50;//in px private static $MAX_IMAGE_SIZE = 10000;//in px //generate an $image_width by $image_height pixels heatmap image of $points public static function createImage($data, $image_width, $image_height, $mode=0, $spot_radius = 30, $dimming = 75, $gradient_name = 'classic'){ $_gradient_name = $gradient_name; if(($_gradient_name != self::$GRADIENT_CLASSIC) && ($_gradient_name != self::$GRADIENT_FIRE) && ($_gradient_name != self::$GRADIENT_PGAITCH)){ $_gradient_name = self::$GRADIENT_CLASSIC; } $_image_width = min(self::$MAX_IMAGE_SIZE, max(0, intval($image_width))); $_image_height = min(self::$MAX_IMAGE_SIZE, max(0, intval($image_height))); $_spot_radius = min(self::$MAX_RADIUS, max(self::$MIN_RADIUS, intval($spot_radius))); $_dimming = min(255, max(0, intval($dimming))); if(!is_array($data)){ return false; } $im = imagecreatetruecolor($_image_width, $_image_height); $white = imagecolorallocate($im, 255, 255, 255); imagefill($im, 0, 0, $white); if(self::$WITH_ALPHA == $mode){ imagealphablending($im, false); imagesavealpha($im,true); } //Step 1: create grayscale image foreach($data as $datum){ if( (is_array($datum) && (count($datum)==1)) || (!is_array($datum) && ('HeatMapPoint' == get_class($datum)))){//Plot points if('HeatMapPoint' != get_class($datum)){ $datum = $datum[0]; } self::_drawCircularGradient($im, $datum->x, $datum->y, $_spot_radius, $_dimming); }else if(is_array($datum)){//Draw lines $length = count($datum)-1; for($i=0; $i < $length; ++$i){//Loop through points //Bresenham's algorithm to plot from from $datum[$i] to $datum[$i+1]; self::_drawBilinearGradient($im, $datum[$i], $datum[$i+1], $_spot_radius, $_dimming); } } } //Gaussian filter if($_spot_radius >= 30){ imagefilter($im, IMG_FILTER_GAUSSIAN_BLUR); } //Step 2: create colored image if(FALSE === ($grad_rgba = self::_createGradient($im, $mode, $_gradient_name))){ return FALSE; } $grad_size = count($grad_rgba); for($x=0; $x <$_image_width; ++$x){ for($y=0; $y <$_image_height; ++$y){ $level = imagecolorat($im, $x, $y) & 0xFF; if( ($level >= 0) && ($level < $grad_size) ){ imagesetpixel($im, $x, $y, $grad_rgba[imagecolorat($im, $x, $y) & 0xFF]); } } } if(self::$WITH_TRANSPARENCY == $mode){ imagecolortransparent($im, $grad_rgba[count($grad_rgba)-1]); } return $im; }//createImage //Heat an image public static function heatImage($filepath, $gradient_name = 'classic', $mode= 0, $min_level=0, $max_level=255, $gradient_interpolate=0, $keep_value=0){ $_gradient_name = $gradient_name; if(($_gradient_name != self::$GRADIENT_CLASSIC) && ($_gradient_name != self::$GRADIENT_FIRE) && ($_gradient_name != self::$GRADIENT_PGAITCH)){ $_gradient_name = self::$GRADIENT_CLASSIC; } $_min_level = min(255, max(0, intval($min_level))); $_max_level = min(255, max(0, intval($max_level))); //try opening jpg first then png then gif format if(FALSE === ($im = @imagecreatefromjpeg($filepath))){ if(FALSE === ($im = @imagecreatefrompng($filepath))){ if(FALSE === ($im = @imagecreatefromgif($filepath))){ return FALSE; } } } if(self::$WITH_ALPHA == $mode){ imagealphablending($im, false); imagesavealpha($im,true); } $width = imagesx($im); $height = imagesy($im); if(FALSE === ($grad_rgba = self::_createGradient($im, $mode, $_gradient_name))){ return FALSE; } //Convert to grayscale $grad_size = count($grad_rgba); $level_range = $_max_level - $_min_level; for($x=0; $x <$width; ++$x){ for($y=0; $y <$height; ++$y){ $rgb = imagecolorat($im, $x, $y); $r = ($rgb >> 16) & 0xFF; $g = ($rgb >> 8) & 0xFF; $b = $rgb & 0xFF; $gray_level = Min(255, Max(0, floor(0.33 * $r + 0.5 * $g + 0.16 * $b)));//between 0 and 255 if( ($gray_level >= $_min_level) && ($gray_level <= $_max_level) ){ switch($gradient_interpolate){ case self::$GRADIENT_NO_NEGATE_NO_INTERPOLATE: //$_max_level takes related lowest gradient color //$_min_level takes related highest gradient color $value = 255 - $gray_level; break; case self::$GRADIENT_NEGATE_NO_INTERPOLATE: //$_max_level takes related highest gradient color //$_min_level takes related lowest gradient color $value = $gray_level; break; case self::$GRADIENT_NO_NEGATE_INTERPOLATE: //$_max_level takes lowest gradient color //$_min_level takes highest gradient color $value = 255- floor(($gray_level - $_min_level) * $grad_size / $level_range); break; case self::$GRADIENT_NEGATE_INTERPOLATE: //$_max_level takes highest gradient color //$_min_level takes lowest gradient color $value = floor(($gray_level - $_min_level) * $grad_size / $level_range); break; default: &nbs |