| | 237 | * Draws the alphasoup Captcha image: |
| | 238 | * Requires GD with freetype and available truetype compatible font files. |
| | 239 | * |
| | 240 | * @param none |
| | 241 | * @return void |
| | 242 | */ |
| | 243 | protected function alphasoup_captcha() |
| | 244 | { |
| | 245 | $this->img_create(); |
| | 246 | $font = $this->font_path.$this->font_name; |
| | 247 | $text_color = imagecolorallocate($this->image, mt_rand(0, 100), mt_rand(0, 100), mt_rand(0, 100)); |
| | 248 | $color_limit = mt_rand(96, 160); |
| | 249 | $fill_color = imageColorAllocate($this->image, mt_rand($color_limit, 255), mt_rand($color_limit, 255), mt_rand($color_limit, 255)); |
| | 250 | imageFilledRectangle($this->image, 0, 0, $this->width, $this->height, $fill_color); |
| | 251 | $font_width = imageFontWidth(10); |
| | 252 | $chars = 'ABCDEFGHIJKLMNO'; |
| | 253 | |
| | 254 | for($loop = 0; $loop < 20; $loop++) |
| | 255 | { |
| | 256 | $text_color = imageColorAllocate($this->image, mt_rand($color_limit + 8, 255), mt_rand($color_limit + 8, 255), mt_rand($color_limit + 8, 255)); |
| | 257 | $char = substr($chars, mt_rand(0,15), 1); |
| | 258 | imageTTFtext($this->image, mt_rand(23, 27), mt_rand(160, 200), mt_rand(-10, $this->width+10), mt_rand(-10, 60), $text_color, $font, $char); |
| | 259 | } |
| | 260 | |
| | 261 | $this->calculate_spacing(); |
| | 262 | // Draw each Captcha character with varying attributes |
| | 263 | for ($i = 0, $strlen = strlen($this->captcha_code); $i < $strlen; $i++) |
| | 264 | { |
| | 265 | // Allocate random color, size and rotation attributes to text |
| | 266 | $text_color = imagecolorallocate($this->image, mt_rand(0, 100), mt_rand(0, 100), mt_rand(0, 100)); |
| | 267 | $angle = mt_rand(-40, 40); |
| | 268 | |
| | 269 | // Make first char angle inward |
| | 270 | if ($i === 0) |
| | 271 | { |
| | 272 | $angle = -abs($angle); |
| | 273 | } |
| | 274 | // Make last char angle inward |
| | 275 | if ($i === ($this->num_chars - 1)) |
| | 276 | { |
| | 277 | $angle = abs($angle); |
| | 278 | } |
| | 279 | |
| | 280 | // Scale the character size on image height |
| | 281 | $font_size = mt_rand($this->height - 20, $this->height - 12); |
| | 282 | $char_details = imageftbbox($font_size, $angle, $font, $this->captcha_code[$i], array()); |
| | 283 | |
| | 284 | // Calculate character starting coordinates |
| | 285 | $iX = $this->spacing / 4 + $i * $this->spacing; |
| | 286 | $char_height = $char_details[2] - $char_details[5]; |
| | 287 | $iY = $this->height / 2 + $char_height / 4; |
| | 288 | |
| | 289 | // Write text character to image |
| | 290 | imagefttext($this->image, $font_size, $angle, $iX, $iY, $text_color, $font, $this->captcha_code[$i], array()); |
| | 291 | } |
| | 292 | |
| | 293 | } |
| | 294 | |
| | 295 | /** |
