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| <?php | |
| /** | |
| * | |
| * This file is part of the phpBB Forum Software package. | |
| * | |
| * @copyright (c) phpBB Limited <https://www.phpbb.com> | |
| * @license GNU General Public License, version 2 (GPL-2.0) | |
| * | |
| * For full copyright and license information, please see | |
| * the docs/CREDITS.txt file. | |
| * | |
| */ | |
| namespace phpbb\captcha; | |
| class char_cube3d | |
| { | |
| var $bitmap; | |
| var $bitmap_width; | |
| var $bitmap_height; | |
| var $basis_matrix = array(array(1, 0, 0), array(0, 1, 0), array(0, 0, 1)); | |
| var $abs_x = array(1, 0); | |
| var $abs_y = array(0, 1); | |
| var $x = 0; | |
| var $y = 1; | |
| var $z = 2; | |
| var $letter = ''; | |
| /** | |
| */ | |
| function __construct(&$bitmaps, $letter) | |
| { | |
| $this->bitmap = $bitmaps['data'][$letter]; | |
| $this->bitmap_width = $bitmaps['width']; | |
| $this->bitmap_height = $bitmaps['height']; | |
| $this->basis_matrix[0][0] = mt_rand(-600, 600); | |
| $this->basis_matrix[0][1] = mt_rand(-600, 600); | |
| $this->basis_matrix[0][2] = (mt_rand(0, 1) * 2000) - 1000; | |
| $this->basis_matrix[1][0] = mt_rand(-1000, 1000); | |
| $this->basis_matrix[1][1] = mt_rand(-1000, 1000); | |
| $this->basis_matrix[1][2] = mt_rand(-1000, 1000); | |
| $this->normalize($this->basis_matrix[0]); | |
| $this->normalize($this->basis_matrix[1]); | |
| $this->basis_matrix[2] = $this->cross_product($this->basis_matrix[0], $this->basis_matrix[1]); | |
| $this->normalize($this->basis_matrix[2]); | |
| // $this->basis_matrix[1] might not be (probably isn't) orthogonal to $basis_matrix[0] | |
| $this->basis_matrix[1] = $this->cross_product($this->basis_matrix[0], $this->basis_matrix[2]); | |
| $this->normalize($this->basis_matrix[1]); | |
| // Make sure our cube is facing into the canvas (assuming +z == in) | |
| for ($i = 0; $i < 3; ++$i) | |
| { | |
| if ($this->basis_matrix[$i][2] < 0) | |
| { | |
| $this->basis_matrix[$i][0] *= -1; | |
| $this->basis_matrix[$i][1] *= -1; | |
| $this->basis_matrix[$i][2] *= -1; | |
| } | |
| } | |
| // Force our "z" basis vector to be the one with greatest absolute z value | |
| $this->x = 0; | |
| $this->y = 1; | |
| $this->z = 2; | |
| // Swap "y" with "z" | |
| if ($this->basis_matrix[1][2] > $this->basis_matrix[2][2]) | |
| { | |
| $this->z = 1; | |
| $this->y = 2; | |
| } | |
| // Swap "x" with "z" | |
| if ($this->basis_matrix[0][2] > $this->basis_matrix[$this->z][2]) | |
| { | |
| $this->x = $this->z; | |
| $this->z = 0; | |
| } | |
| // Still need to determine which of $x,$y are which. | |
| // wrong orientation if y's y-component is less than it's x-component | |
| // likewise if x's x-component is less than it's y-component | |
| // if they disagree, go with the one with the greater weight difference. | |
| // rotate if positive | |
| $weight = (abs($this->basis_matrix[$this->x][1]) - abs($this->basis_matrix[$this->x][0])) + (abs($this->basis_matrix[$this->y][0]) - abs($this->basis_matrix[$this->y][1])); | |
| // Swap "x" with "y" | |
| if ($weight > 0) | |
| { | |
| list($this->x, $this->y) = array($this->y, $this->x); | |
| } | |
| $this->abs_x = array($this->basis_matrix[$this->x][0], $this->basis_matrix[$this->x][1]); | |
| $this->abs_y = array($this->basis_matrix[$this->y][0], $this->basis_matrix[$this->y][1]); | |
| if ($this->abs_x[0] < 0) | |
| { | |
| $this->abs_x[0] *= -1; | |
| $this->abs_x[1] *= -1; | |
| } | |
| if ($this->abs_y[1] > 0) | |
| { | |
| $this->abs_y[0] *= -1; | |
| $this->abs_y[1] *= -1; | |
| } | |
| $this->letter = $letter; | |
| } | |
| /** | |
| * Draw a character | |
| */ | |
| function drawchar($scale, $xoff, $yoff, $img, $background, $colours) | |
| { | |
| $width = $this->bitmap_width; | |
| $height = $this->bitmap_height; | |
| $bitmap = $this->bitmap; | |
| $colour1 = $colours[array_rand($colours)]; | |
| $colour2 = $colours[array_rand($colours)]; | |
| $swapx = ($this->basis_matrix[$this->x][0] > 0); | |
| $swapy = ($this->basis_matrix[$this->y][1] < 0); | |
| for ($y = 0; $y < $height; ++$y) | |
| { | |
| for ($x = 0; $x < $width; ++$x) | |
| { | |
| $xp = ($swapx) ? ($width - $x - 1) : $x; | |
| $yp = ($swapy) ? ($height - $y - 1) : $y; | |
| if ($bitmap[$height - $yp - 1][$xp]) | |
| { | |
| $dx = $this->scale($this->abs_x, ($xp - ($swapx ? ($width / 2) : ($width / 2) - 1)) * $scale); | |
| $dy = $this->scale($this->abs_y, ($yp - ($swapy ? ($height / 2) : ($height / 2) - 1)) * $scale); | |
| $xo = $xoff + $dx[0] + $dy[0]; | |
| $yo = $yoff + $dx[1] + $dy[1]; | |
| $origin = array(0, 0, 0); | |
| $xvec = $this->scale($this->basis_matrix[$this->x], $scale); | |
| $yvec = $this->scale($this->basis_matrix[$this->y], $scale); | |
| $face_corner = $this->sum2($xvec, $yvec); | |
| $zvec = $this->scale($this->basis_matrix[$this->z], $scale); | |
| $x_corner = $this->sum2($xvec, $zvec); | |
| $y_corner = $this->sum2($yvec, $zvec); | |
| imagefilledpolygon($img, $this->gen_poly($xo, $yo, $origin, $xvec, $x_corner,$zvec), 4, $colour1); | |
| imagefilledpolygon($img, $this->gen_poly($xo, $yo, $origin, $yvec, $y_corner,$zvec), 4, $colour2); | |
| $face = $this->gen_poly($xo, $yo, $origin, $xvec, $face_corner, $yvec); | |
| imagefilledpolygon($img, $face, 4, $background); | |
| imagepolygon($img, $face, 4, $colour1); | |
| } | |
| } | |
| } | |
| } | |
| /* | |
| * return a roughly acceptable range of sizes for rendering with this texttype | |
| */ | |
| function range() | |
| { | |
| return array(3, 4); | |
| } | |
| /** | |
| * Vector length | |
| */ | |
| function vectorlen($vector) | |
| { | |
| return sqrt(pow($vector[0], 2) + pow($vector[1], 2) + pow($vector[2], 2)); | |
| } | |
| /** | |
| * Normalize | |
| */ | |
| function normalize(&$vector, $length = 1) | |
| { | |
| $length = (( $length < 1) ? 1 : $length); | |
| $length /= $this->vectorlen($vector); | |
| $vector[0] *= $length; | |
| $vector[1] *= $length; | |
| $vector[2] *= $length; | |
| } | |
| /** | |
| */ | |
| function cross_product($vector1, $vector2) | |
| { | |
| $retval = array(0, 0, 0); | |
| $retval[0] = (($vector1[1] * $vector2[2]) - ($vector1[2] * $vector2[1])); | |
| $retval[1] = -(($vector1[0] * $vector2[2]) - ($vector1[2] * $vector2[0])); | |
| $retval[2] = (($vector1[0] * $vector2[1]) - ($vector1[1] * $vector2[0])); | |
| return $retval; | |
| } | |
| /** | |
| */ | |
| function sum($vector1, $vector2) | |
| { | |
| return array($vector1[0] + $vector2[0], $vector1[1] + $vector2[1], $vector1[2] + $vector2[2]); | |
| } | |
| /** | |
| */ | |
| function sum2($vector1, $vector2) | |
| { | |
| return array($vector1[0] + $vector2[0], $vector1[1] + $vector2[1]); | |
| } | |
| /** | |
| */ | |
| function scale($vector, $length) | |
| { | |
| if (count($vector) == 2) | |
| { | |
| return array($vector[0] * $length, $vector[1] * $length); | |
| } | |
| return array($vector[0] * $length, $vector[1] * $length, $vector[2] * $length); | |
| } | |
| /** | |
| */ | |
| function gen_poly($xoff, $yoff, &$vec1, &$vec2, &$vec3, &$vec4) | |
| { | |
| $poly = array(); | |
| $poly[0] = $xoff + $vec1[0]; | |
| $poly[1] = $yoff + $vec1[1]; | |
| $poly[2] = $xoff + $vec2[0]; | |
| $poly[3] = $yoff + $vec2[1]; | |
| $poly[4] = $xoff + $vec3[0]; | |
| $poly[5] = $yoff + $vec3[1]; | |
| $poly[6] = $xoff + $vec4[0]; | |
| $poly[7] = $yoff + $vec4[1]; | |
| return $poly; | |
| } | |
| /** | |
| * dimensions | |
| */ | |
| function dimensions($size) | |
| { | |
| $xn = $this->scale($this->basis_matrix[$this->x], -($this->bitmap_width / 2) * $size); | |
| $xp = $this->scale($this->basis_matrix[$this->x], ($this->bitmap_width / 2) * $size); | |
| $yn = $this->scale($this->basis_matrix[$this->y], -($this->bitmap_height / 2) * $size); | |
| $yp = $this->scale($this->basis_matrix[$this->y], ($this->bitmap_height / 2) * $size); | |
| $p = array(); | |
| $p[0] = $this->sum2($xn, $yn); | |
| $p[1] = $this->sum2($xp, $yn); | |
| $p[2] = $this->sum2($xp, $yp); | |
| $p[3] = $this->sum2($xn, $yp); | |
| $min_x = $max_x = $p[0][0]; | |
| $min_y = $max_y = $p[0][1]; | |
| for ($i = 1; $i < 4; ++$i) | |
| { | |
| $min_x = ($min_x > $p[$i][0]) ? $p[$i][0] : $min_x; | |
| $min_y = ($min_y > $p[$i][1]) ? $p[$i][1] : $min_y; | |
| $max_x = ($max_x < $p[$i][0]) ? $p[$i][0] : $max_x; | |
| $max_y = ($max_y < $p[$i][1]) ? $p[$i][1] : $max_y; | |
| } | |
| return array($min_x, $min_y, $max_x, $max_y); | |
| } | |
| } |