gistfile1.php

   // アフィン変換の未知数
    $a = '';
    $b = '';
    $c = '';
    $d = '';
    $l = '';
    $m = '';

    // 連立方程式を解く
    $a = ($point[0]['x2'] * $point[1]['y1'] + $point[1]['x2'] * $point[2]['y1'] + $point[2]['x2'] * $point[0]['y1'] - $point[0]['x2'] * $point[2]['y1'] - $point[1]['x2'] * $point[0]['y1'] - $point[2]['x2'] * $point[1]['y1']) / ($point[0]['x1'] * $point[1]['y1'] + $point[1]['x1'] * $point[2]['y1'] + $point[2]['x1'] * $point[0]['y1'] - $point[0]['x1'] * $point[2]['y1'] - $point[1]['x1'] * $point[0]['y1'] - $point[2]['x1'] * $point[1]['y1']);
    $b = ($point[0]['x1'] * $point[1]['x2'] + $point[1]['x1'] * $point[2]['x2'] + $point[2]['x1'] * $point[0]['x2'] - $point[0]['x1'] * $point[2]['x2'] - $point[1]['x1'] * $point[0]['x2'] - $point[2]['x1'] * $point[1]['x2']) / ($point[0]['x1'] * $point[1]['y1'] + $point[1]['x1'] * $point[2]['y1'] + $point[2]['x1'] * $point[0]['y1'] - $point[0]['x1'] * $point[2]['y1'] - $point[1]['x1'] * $point[0]['y1'] - $point[2]['x1'] * $point[1]['y1']);
    $l = ($point[0]['x1'] * $point[1]['y1'] * $point[2]['x2'] + $point[1]['x1'] * $point[2]['y1'] * $point[0]['x2'] + $point[2]['x1'] * $point[0]['y1'] * $point[1]['x2'] - $point[0]['x1'] * $point[2]['y1'] * $point[1]['x2'] - $point[1]['x1'] * $point[0]['y1'] * $point[2]['x2'] - $point[2]['x1'] * $point[1]['y1'] * $point[0]['x2']) / ($point[0]['x1'] * $point[1]['y1'] + $point[1]['x1'] * $point[2]['y1'] + $point[2]['x1'] * $point[0]['y1'] - $point[0]['x1'] * $point[2]['y1'] - $point[1]['x1'] * $point[0]['y1'] - $point[2]['x1'] * $point[1]['y1']);
    $c = ($point[0]['y2'] * $point[1]['y1'] + $point[1]['y2'] * $point[2]['y1'] + $point[2]['y2'] * $point[0]['y1'] - $point[0]['y2'] * $point[2]['y1'] - $point[1]['y2'] * $point[0]['y1'] - $point[2]['y2'] * $point[1]['y1']) / ($point[0]['x1'] * $point[1]['y1'] + $point[1]['x1'] * $point[2]['y1'] + $point[2]['x1'] * $point[0]['y1'] - $point[0]['x1'] * $point[2]['y1'] - $point[1]['x1'] * $point[0]['y1'] - $point[2]['x1'] * $point[1]['y1']);
    $d = ($point[0]['x1'] * $point[1]['y2'] + $point[1]['x1'] * $point[2]['y2'] + $point[2]['x1'] * $point[0]['y2'] - $point[0]['x1'] * $point[2]['y2'] - $point[1]['x1'] * $point[0]['y2'] - $point[2]['x1'] * $point[1]['y2']) / ($point[0]['x1'] * $point[1]['y1'] + $point[1]['x1'] * $point[2]['y1'] + $point[2]['x1'] * $point[0]['y1'] - $point[0]['x1'] * $point[2]['y1'] - $point[1]['x1'] * $point[0]['y1'] - $point[2]['x1'] * $point[1]['y1']);
    $m = ($point[0]['x1'] * $point[1]['y1'] * $point[2]['y2'] + $point[1]['x1'] * $point[2]['y1'] * $point[0]['y2'] + $point[2]['x1'] * $point[0]['y1'] * $point[1]['y2'] - $point[0]['x1'] * $point[2]['y1'] * $point[1]['y2'] - $point[1]['x1'] * $point[0]['y1'] * $point[2]['y2'] - $point[2]['x1'] * $point[1]['y1'] * $point[0]['y2']) / ($point[0]['x1'] * $point[1]['y1'] + $point[1]['x1'] * $point[2]['y1'] + $point[2]['x1'] * $point[0]['y1'] - $point[0]['x1'] * $point[2]['y1'] - $point[1]['x1'] * $point[0]['y1'] - $point[2]['x1'] * $point[1]['y1']);