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| 1 | <?php |
| 2 | |
| 3 | App::uses('AppController', 'Controller'); |
| 4 | App::uses('Constants', 'Utility'); |
| 5 | |
| 6 | /** |
| 7 | * TsumegoImagesController |
| 8 | * |
| 9 | * Generates PNG images of tsumego puzzles for Open Graph social sharing. |
| 10 | * |
| 11 | * IMPORTANT: When changing the rendering algorithm below, bump |
| 12 | * Constants::$TSUMEGO_IMAGE_VERSION to invalidate cached OG images. |
| 13 | */ |
| 14 | class TsumegoImagesController extends AppController |
| 15 | { |
| 16 | /** |
| 17 | * Generate a PNG image for a tsumego puzzle for Open Graph sharing |
| 18 | * |
| 19 | * @param int|null $setConnectionId The SetConnection ID (same as /id route) |
| 20 | * @return CakeResponse PNG image with caching headers |
| 21 | */ |
| 22 | public function tsumegoImage($setConnectionId = null) |
| 23 | { |
| 24 | if (!$setConnectionId || !is_numeric($setConnectionId)) |
| 25 | throw new NotFoundException('Invalid set connection ID'); |
| 26 | |
| 27 | // Single query: join SetConnection → Tsumego → Sgf + Set, fetch only needed fields |
| 28 | $data = ClassRegistry::init('SetConnection')->query( |
| 29 | 'SELECT s.title AS set_title, t.description, t.created, sgf.sgf |
| 30 | FROM set_connection sc |
| 31 | JOIN tsumego t ON t.id = sc.tsumego_id |
| 32 | JOIN `set` s ON s.id = sc.set_id |
| 33 | JOIN sgf ON sgf.tsumego_id = t.id AND sgf.accepted = 1 |
| 34 | WHERE sc.id = ? |
| 35 | ORDER BY sgf.id DESC |
| 36 | LIMIT 1', |
| 37 | [(int) $setConnectionId] |
| 38 | ); |
| 39 | |
| 40 | if (empty($data)) |
| 41 | throw new NotFoundException('Puzzle not found'); |
| 42 | |
| 43 | $row = $data[0]; |
| 44 | $sgfString = $row['sgf']['sgf']; |
| 45 | $setTitle = $row['s']['set_title'] ?? 'Tsumego'; |
| 46 | $description = $row['t']['description'] ?? ''; |
| 47 | |
| 48 | if (empty($sgfString)) |
| 49 | throw new NotFoundException('SGF not found'); |
| 50 | |
| 51 | $imageData = $this->_generatePuzzleImage($sgfString, $setTitle, $description); |
| 52 | |
| 53 | $this->response->type('png'); |
| 54 | $this->response->body($imageData); |
| 55 | $this->response->etag(md5(Constants::$TSUMEGO_IMAGE_VERSION . $sgfString)); |
| 56 | $modified = !empty($row['t']['created']) ? $row['t']['created'] : '-1 day'; |
| 57 | $this->response->cache($modified, '+1 year'); |
| 58 | |
| 59 | return $this->response; |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * Generate puzzle image using PHP GD |
| 64 | * |
| 65 | * @param string $sgfString SGF content |
| 66 | * @param string $setTitle Set/collection title (e.g., "Life & Death - Intermediate") |
| 67 | * @param string $description Problem description (e.g., "[b] to live.") |
| 68 | * @return string PNG image data |
| 69 | */ |
| 70 | private function _generatePuzzleImage($sgfString, $setTitle, $description) |
| 71 | { |
| 72 | // Parse board size from SGF (default 19) |
| 73 | $boardSize = 19; |
| 74 | if (preg_match('/SZ\[(\d+)\]/', $sgfString, $szMatch)) |
| 75 | $boardSize = (int) $szMatch[1]; |
| 76 | |
| 77 | // Parse SGF and extract stone positions |
| 78 | $stones = $this->_parseSgfStones($sgfString); |
| 79 | if (empty($stones)) |
| 80 | throw new InternalErrorException('No stones found in SGF'); |
| 81 | |
| 82 | // Calculate bounding box of stones |
| 83 | $minX = $minY = $boardSize - 1; |
| 84 | $maxX = $maxY = 0; |
| 85 | foreach ($stones as $stone) |
| 86 | { |
| 87 | $minX = min($minX, $stone['x']); |
| 88 | $maxX = max($maxX, $stone['x']); |
| 89 | $minY = min($minY, $stone['y']); |
| 90 | $maxY = max($maxY, $stone['y']); |
| 91 | } |
| 92 | |
| 93 | // Add padding (2 intersections on each side, but don't go outside board) |
| 94 | $padding = 2; |
| 95 | $minX = max(0, $minX - $padding); |
| 96 | $minY = max(0, $minY - $padding); |
| 97 | $maxX = min($boardSize - 1, $maxX + $padding); |
| 98 | $maxY = min($boardSize - 1, $maxY + $padding); |
| 99 | |
| 100 | $cropWidth = $maxX - $minX + 1; // Number of intersections |
| 101 | $cropHeight = $maxY - $minY + 1; |
| 102 | |
| 103 | // Determine if board should be rotated (portrait -> landscape) |
| 104 | $rotate = $cropHeight > $cropWidth; |
| 105 | |
| 106 | // If rotating, swap width/height for calculations |
| 107 | if ($rotate) |
| 108 | { |
| 109 | $temp = $cropWidth; |
| 110 | $cropWidth = $cropHeight; |
| 111 | $cropHeight = $temp; |
| 112 | } |
| 113 | |
| 114 | // Image dimensions |
| 115 | $width = Constants::$OG_IMAGE_WIDTH; |
| 116 | $height = Constants::$OG_IMAGE_HEIGHT; |
| 117 | |
| 118 | // Calculate cell size — account for stone overhang and coordinate labels |
| 119 | // Stones extend 0.45*cellSize beyond grid + shadow adds ~0.1*cellSize more |
| 120 | $stoneOverhang = 0.55; // safety margin for stone radius + shadow |
| 121 | // Labels need extra space: right (row numbers) and bottom (column letters) |
| 122 | $labelSpace = 1.0; // ~1 cellSize worth of space for labels |
| 123 | $effectiveCropWidth = ($cropWidth - 1) + 2 * $stoneOverhang + $labelSpace; |
| 124 | $effectiveCropHeight = ($cropHeight - 1) + 2 * $stoneOverhang + $labelSpace; |
| 125 | |
| 126 | $margin = 20; |
| 127 | $availableWidth = $width - (2 * $margin); |
| 128 | $availableHeight = $height - (2 * $margin); |
| 129 | |
| 130 | $cellSize = min( |
| 131 | $availableWidth / $effectiveCropWidth, |
| 132 | $availableHeight / $effectiveCropHeight |
| 133 | ); |
| 134 | |
| 135 | // Calculate board dimensions |
| 136 | $boardPixelsWidth = ($cropWidth - 1) * $cellSize; |
| 137 | $boardPixelsHeight = ($cropHeight - 1) * $cellSize; |
| 138 | |
| 139 | // Offset board center: shift LEFT for right labels, shift UP for bottom labels |
| 140 | $labelPixels = $cellSize * $labelSpace * 0.5; |
| 141 | $boardX = ($width - $boardPixelsWidth) / 2 - $labelPixels; |
| 142 | $boardY = ($height - $boardPixelsHeight) / 2 - $labelPixels; |
| 143 | |
| 144 | // Create image |
| 145 | $img = imagecreatetruecolor($width, $height); |
| 146 | imageantialias($img, true); |
| 147 | |
| 148 | // Define colors |
| 149 | $bgColor = imagecolorallocate($img, 220, 179, 92); // Wood/tan background |
| 150 | $boardColor = imagecolorallocate($img, 210, 170, 85); // Slightly darker for board |
| 151 | $lineColor = imagecolorallocate($img, 0, 0, 0); // Black lines |
| 152 | $borderColor = imagecolorallocate($img, 60, 40, 10); // Dark brown board frame |
| 153 | |
| 154 | // Fill background |
| 155 | imagefill($img, 0, 0, $bgColor); |
| 156 | |
| 157 | // Draw board background; frame only on sides that are actual board edges |
| 158 | $frameWidth = 4; |
| 159 | $isLeftEdge = ($rotate ? $minY : $minX) === 0; |
| 160 | $isRightEdge = ($rotate ? $maxY : $maxX) === $boardSize - 1; |
| 161 | $isTopEdge = ($rotate ? $minX : $minY) === 0; |
| 162 | $isBottomEdge = ($rotate ? $maxX : $maxY) === $boardSize - 1; |
| 163 | $bx0 = (int) $boardX; |
| 164 | $by0 = (int) $boardY; |
| 165 | $bx1 = (int) ($boardX + ($cropWidth - 1) * $cellSize); |
| 166 | $by1 = (int) ($boardY + ($cropHeight - 1) * $cellSize); |
| 167 | imagefilledrectangle($img, $bx0, $by0, $bx1, $by1, $boardColor); |
| 168 | if ($isLeftEdge) |
| 169 | imagefilledrectangle($img, $bx0 - $frameWidth, $by0 - ($isTopEdge ? $frameWidth : 0), $bx0 - 1, $by1 + ($isBottomEdge ? $frameWidth : 0), $borderColor); |
| 170 | if ($isRightEdge) |
| 171 | imagefilledrectangle($img, $bx1 + 1, $by0 - ($isTopEdge ? $frameWidth : 0), $bx1 + $frameWidth, $by1 + ($isBottomEdge ? $frameWidth : 0), $borderColor); |
| 172 | if ($isTopEdge) |
| 173 | imagefilledrectangle($img, $bx0 - ($isLeftEdge ? $frameWidth : 0), $by0 - $frameWidth, $bx1 + ($isRightEdge ? $frameWidth : 0), $by0 - 1, $borderColor); |
| 174 | if ($isBottomEdge) |
| 175 | imagefilledrectangle($img, $bx0 - ($isLeftEdge ? $frameWidth : 0), $by1 + 1, $bx1 + ($isRightEdge ? $frameWidth : 0), $by1 + $frameWidth, $borderColor); |
| 176 | |
| 177 | // Draw grid lines - thicker at board edges |
| 178 | |
| 179 | // Interior grid lines (thin) |
| 180 | imagesetthickness($img, 1); |
| 181 | for ($i = 0; $i < $cropWidth; $i++) |
| 182 | { |
| 183 | $pos = $boardX + $i * $cellSize; |
| 184 | imageline($img, (int) $pos, (int) $boardY, (int) $pos, (int) ($boardY + ($cropHeight - 1) * $cellSize), $lineColor); |
| 185 | } |
| 186 | for ($i = 0; $i < $cropHeight; $i++) |
| 187 | { |
| 188 | $pos = $boardY + $i * $cellSize; |
| 189 | imageline($img, (int) $boardX, (int) $pos, (int) ($boardX + ($cropWidth - 1) * $cellSize), (int) $pos, $lineColor); |
| 190 | } |
| 191 | |
| 192 | // Thicker edge lines where crop touches actual board edge |
| 193 | imagesetthickness($img, 3); |
| 194 | if ($isLeftEdge) |
| 195 | imageline($img, (int) $boardX, (int) $boardY, (int) $boardX, (int) ($boardY + ($cropHeight - 1) * $cellSize), $lineColor); |
| 196 | if ($isRightEdge) |
| 197 | imageline($img, (int) ($boardX + ($cropWidth - 1) * $cellSize), (int) $boardY, (int) ($boardX + ($cropWidth - 1) * $cellSize), (int) ($boardY + ($cropHeight - 1) * $cellSize), $lineColor); |
| 198 | if ($isTopEdge) |
| 199 | imageline($img, (int) $boardX, (int) $boardY, (int) ($boardX + ($cropWidth - 1) * $cellSize), (int) $boardY, $lineColor); |
| 200 | if ($isBottomEdge) |
| 201 | imageline($img, (int) $boardX, (int) ($boardY + ($cropHeight - 1) * $cellSize), (int) ($boardX + ($cropWidth - 1) * $cellSize), (int) ($boardY + ($cropHeight - 1) * $cellSize), $lineColor); |
| 202 | imagesetthickness($img, 1); |
| 203 | |
| 204 | // Draw star points (hoshi) - only if they're in the cropped area |
| 205 | $starPoints = $this->_getStarPoints($boardSize); |
| 206 | foreach ($starPoints as $point) |
| 207 | if ($point[0] >= $minX && $point[0] <= $maxX && $point[1] >= $minY && $point[1] <= $maxY) |
| 208 | { |
| 209 | if ($rotate) |
| 210 | { |
| 211 | // Swap coordinates for rotated board |
| 212 | $x = $boardX + ($point[1] - $minY) * $cellSize; |
| 213 | $y = $boardY + ($point[0] - $minX) * $cellSize; |
| 214 | } |
| 215 | else |
| 216 | { |
| 217 | $x = $boardX + ($point[0] - $minX) * $cellSize; |
| 218 | $y = $boardY + ($point[1] - $minY) * $cellSize; |
| 219 | } |
| 220 | $starSize = (int) ($cellSize * 0.2); |
| 221 | imagefilledellipse($img, (int) $x, (int) $y, $starSize, $starSize, $lineColor); |
| 222 | } |
| 223 | |
| 224 | // Draw coordinate labels BEFORE stones (so stones naturally cover labels at edges) |
| 225 | $labelColor = imagecolorallocate($img, 140, 115, 60); // Warm brown, visible on wood |
| 226 | $fontPath = dirname(__DIR__, 2) . '/resources/fonts/NimbusSans-Bold.otf'; |
| 227 | $labelFontSize = max(10, $cellSize * 0.45); // ~45% of cell size - large and readable |
| 228 | $colLetters = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T']; |
| 229 | $labelGap = $frameWidth + $cellSize * 0.55; // Clear stone overhang at board edges |
| 230 | |
| 231 | // Column letters along bottom |
| 232 | for ($i = 0; $i < $cropWidth; $i++) |
| 233 | { |
| 234 | $col = $rotate ? ($minY + $i) : ($minX + $i); |
| 235 | if ($col < 0 || $col >= count($colLetters)) |
| 236 | continue; |
| 237 | $letter = $colLetters[$col]; |
| 238 | $x = $boardX + $i * $cellSize; |
| 239 | $bbox = imagettfbbox($labelFontSize, 0, $fontPath, $letter); |
| 240 | $textWidth = $bbox[2] - $bbox[0]; |
| 241 | $textHeight = $bbox[1] - $bbox[7]; |
| 242 | imagettftext($img, $labelFontSize, 0, |
| 243 | (int) ($x - $textWidth / 2), |
| 244 | (int) ($boardY + ($cropHeight - 1) * $cellSize + $labelGap + $textHeight), |
| 245 | $labelColor, $fontPath, $letter); |
| 246 | } |
| 247 | |
| 248 | // Row numbers along right side (Go convention: row 1 is at bottom of board) |
| 249 | for ($i = 0; $i < $cropHeight; $i++) |
| 250 | { |
| 251 | $row = $rotate ? ($minX + $i) : ($minY + $i); |
| 252 | $rowNum = $boardSize - $row; |
| 253 | $label = (string) $rowNum; |
| 254 | $y = $boardY + $i * $cellSize; |
| 255 | $bbox = imagettfbbox($labelFontSize, 0, $fontPath, $label); |
| 256 | $textWidth = $bbox[2] - $bbox[0]; |
| 257 | $textHeight = $bbox[1] - $bbox[7]; |
| 258 | imagettftext($img, $labelFontSize, 0, |
| 259 | (int) ($boardX + ($cropWidth - 1) * $cellSize + $labelGap), |
| 260 | (int) ($y + $textHeight / 2), |
| 261 | $labelColor, $fontPath, $label); |
| 262 | } |
| 263 | |
| 264 | // Draw stones with 3D gradient effect and shadows |
| 265 | $stoneRadius = $cellSize * 0.45; |
| 266 | foreach ($stones as $stone) |
| 267 | { |
| 268 | if ($rotate) |
| 269 | { |
| 270 | $x = $boardX + ($stone['y'] - $minY) * $cellSize; |
| 271 | $y = $boardY + ($stone['x'] - $minX) * $cellSize; |
| 272 | } |
| 273 | else |
| 274 | { |
| 275 | $x = $boardX + ($stone['x'] - $minX) * $cellSize; |
| 276 | $y = $boardY + ($stone['y'] - $minY) * $cellSize; |
| 277 | } |
| 278 | |
| 279 | $this->_drawStone($img, (int) $x, (int) $y, $stoneRadius, $stone['color'] === 'B'); |
| 280 | } |
| 281 | |
| 282 | // Convert to PNG and return |
| 283 | ob_start(); |
| 284 | imagepng($img, null, 6); // Compression level 6 (balance speed/size) |
| 285 | $imageData = ob_get_clean(); |
| 286 | imagedestroy($img); |
| 287 | |
| 288 | return $imageData; |
| 289 | } |
| 290 | |
| 291 | /** |
| 292 | * Draw a single stone with 3D radial gradient and shadow |
| 293 | * |
| 294 | * Creates a realistic-looking stone using concentric circles that |
| 295 | * interpolate from base color at edges to highlight color at an |
| 296 | * offset point, simulating light reflection. |
| 297 | * |
| 298 | * @param \GdImage $img GD image resource |
| 299 | * @param int $cx Center X coordinate |
| 300 | * @param int $cy Center Y coordinate |
| 301 | * @param float $radius Stone radius in pixels |
| 302 | * @param bool $isBlack True for black stone, false for white |
| 303 | */ |
| 304 | private function _drawStone(\GdImage $img, int $cx, int $cy, float $radius, bool $isBlack) |
| 305 | { |
| 306 | // Shadow (slightly offset, darkened board color) |
| 307 | $shadowOffset = max(2, (int) ($radius * 0.08)); |
| 308 | $shadowDiameter = (int) ($radius * 2.05); |
| 309 | $shadowColor = imagecolorallocate($img, 160, 130, 60); |
| 310 | imagefilledellipse($img, $cx + $shadowOffset, $cy + $shadowOffset, $shadowDiameter, $shadowDiameter, $shadowColor); |
| 311 | |
| 312 | // Gradient parameters |
| 313 | if ($isBlack) |
| 314 | { |
| 315 | $baseR = 10; |
| 316 | $baseG = 10; |
| 317 | $baseB = 10; |
| 318 | $highlightR = 100; |
| 319 | $highlightG = 100; |
| 320 | $highlightB = 100; |
| 321 | } |
| 322 | else |
| 323 | { |
| 324 | $baseR = 195; |
| 325 | $baseG = 195; |
| 326 | $baseB = 200; |
| 327 | $highlightR = 255; |
| 328 | $highlightG = 255; |
| 329 | $highlightB = 255; |
| 330 | } |
| 331 | |
| 332 | // Draw concentric circles from outside to inside |
| 333 | $steps = max(8, (int) ($radius * 0.6)); |
| 334 | $highlightOffsetX = -$radius * 0.3; |
| 335 | $highlightOffsetY = -$radius * 0.35; |
| 336 | |
| 337 | for ($i = $steps; $i >= 0; $i--) |
| 338 | { |
| 339 | $ratio = ($steps - $i) / $steps; // 0 at edge, 1 at highlight center |
| 340 | |
| 341 | // Position: interpolate from stone center toward highlight |
| 342 | $x = $cx + $highlightOffsetX * $ratio; |
| 343 | $y = $cy + $highlightOffsetY * $ratio; |
| 344 | |
| 345 | // Color: interpolate from base to highlight |
| 346 | $r = (int) ($baseR + ($highlightR - $baseR) * $ratio); |
| 347 | $g = (int) ($baseG + ($highlightG - $baseG) * $ratio); |
| 348 | $b = (int) ($baseB + ($highlightB - $baseB) * $ratio); |
| 349 | |
| 350 | $color = imagecolorallocate($img, $r, $g, $b); |
| 351 | $currentDiameter = (int) ($radius * 2.0 * ($i + 1) / ($steps + 1)); |
| 352 | imagefilledellipse($img, (int) $x, (int) $y, $currentDiameter, $currentDiameter, $color); |
| 353 | } |
| 354 | |
| 355 | // White stone needs a subtle outline |
| 356 | if (!$isBlack) |
| 357 | { |
| 358 | $outlineColor = imagecolorallocate($img, 100, 100, 100); |
| 359 | imageellipse($img, $cx, $cy, (int) ($radius * 2), (int) ($radius * 2), $outlineColor); |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | /** |
| 364 | * Get star point coordinates for given board size |
| 365 | * |
| 366 | * @param int $size Board size (9, 13, or 19) |
| 367 | * @return array Array of [x, y] coordinates |
| 368 | */ |
| 369 | private function _getStarPoints($size) |
| 370 | { |
| 371 | if ($size === 19) |
| 372 | { |
| 373 | return [ |
| 374 | [3, 3], [9, 3], [15, 3], |
| 375 | [3, 9], [9, 9], [15, 9], |
| 376 | [3, 15], [9, 15], [15, 15] |
| 377 | ]; |
| 378 | } |
| 379 | elseif ($size === 13) |
| 380 | { |
| 381 | return [ |
| 382 | [3, 3], [9, 3], |
| 383 | [6, 6], |
| 384 | [3, 9], [9, 9] |
| 385 | ]; |
| 386 | } |
| 387 | elseif ($size === 9) |
| 388 | { |
| 389 | return [ |
| 390 | [2, 2], [6, 2], |
| 391 | [4, 4], |
| 392 | [2, 6], [6, 6] |
| 393 | ]; |
| 394 | } |
| 395 | |
| 396 | return []; |
| 397 | } |
| 398 | |
| 399 | /** |
| 400 | * Parse SGF string to extract stone positions |
| 401 | * |
| 402 | * Extracts AB (add black), AW (add white) tags from SGF. |
| 403 | * Handles both single format AB[fa] and compact format AB[fa][bb][fc]. |
| 404 | * Returns initial position suitable for tsumego problems. |
| 405 | * |
| 406 | * @param string $sgf SGF string |
| 407 | * @return array Array of ['x' => int, 'y' => int, 'color' => 'B'|'W'] |
| 408 | */ |
| 409 | private function _parseSgfStones($sgf) |
| 410 | { |
| 411 | $stones = []; |
| 412 | |
| 413 | // Match AB[coords][coords]... (add black stones) - compact format |
| 414 | // Find AB tag, then capture all following [xx] coordinates |
| 415 | if (preg_match('/AB((?:\[[a-s]{2}\])+)/', $sgf, $match)) |
| 416 | { |
| 417 | // Extract all [xx] coordinates from the captured group |
| 418 | preg_match_all('/\[([a-s]{2})\]/', $match[1], $coords); |
| 419 | foreach ($coords[1] as $coord) |
| 420 | $stones[] = array_merge($this->_sgfCoordToXY($coord), ['color' => 'B']); |
| 421 | } |
| 422 | |
| 423 | // Match AW[coords][coords]... (add white stones) - compact format |
| 424 | if (preg_match('/AW((?:\[[a-s]{2}\])+)/', $sgf, $match)) |
| 425 | { |
| 426 | preg_match_all('/\[([a-s]{2})\]/', $match[1], $coords); |
| 427 | foreach ($coords[1] as $coord) |
| 428 | $stones[] = array_merge($this->_sgfCoordToXY($coord), ['color' => 'W']); |
| 429 | } |
| 430 | |
| 431 | return $stones; |
| 432 | } |
| 433 | |
| 434 | /** |
| 435 | * Convert SGF coordinate (e.g., "aa", "pd") to x,y array coordinates |
| 436 | * |
| 437 | * SGF uses lowercase letters: a=0, b=1, ..., s=18 |
| 438 | * |
| 439 | * @param string $coord Two-letter SGF coordinate |
| 440 | * @return array ['x' => int, 'y' => int] |
| 441 | */ |
| 442 | private function _sgfCoordToXY($coord) |
| 443 | { |
| 444 | if (strlen($coord) !== 2) |
| 445 | return ['x' => 0, 'y' => 0]; |
| 446 | |
| 447 | $x = ord($coord[0]) - ord('a'); |
| 448 | $y = ord($coord[1]) - ord('a'); |
| 449 | |
| 450 | return ['x' => $x, 'y' => $y]; |
| 451 | } |
| 452 | } |