/**
* Draw the image
*/
public function draw()
{
$moduleCount = $this->qrcode->getModuleCount();
$tileWidth = $this->width / $moduleCount;
$tileHeight = $this->height / $moduleCount;
$this->img = imagecreatetruecolor($this->width, $this->height);
if ($this->img) {
$fg = imagecolorallocate($this->img, 0, 0, 0);
if ($fg === false) {
$this->finish();
throw new QR_CodeImageException('Could not allocate foreground color!');
}
$bg = imagecolorallocate($this->img, 255, 255, 255);
if ($bg === false) {
$this->finish();
throw new QR_CodeImageException('Could not allocate background color!');
}
for ($row = 0; $row < $moduleCount; $row++) {
for ($col = 0; $col < $moduleCount; $col++) {
$fillStyle = $this->qrcode->isDark($row, $col) ? $fg : $bg;
$x = round($col * $tileWidth);
$y = round($row * $tileHeight);
$w = ceil(($col + 1) * $tileWidth) - floor($col * $tileWidth);
if ($x + $w > $this->width) {
$w = $this->width - $x;
}
$h = ceil(($row + 1) * $tileWidth) - floor($row * $tileWidth);
if ($y + $h > $this->height) {
$h = $this->height - $y;
}
if (!imagefilledrectangle($this->img, $x, $y, $x + $w, $y + $h, $fillStyle)) {
$this->finish();
throw new QR_CodeImageException(sprintf('Could not fill the rectangle using desired coordinates (x = %d, y = %d, w = %d, h = %d, c = %d)', $x, $y, $w, $h, $fillStyle));
}
}
}
} else {
throw new QR_CodeImageException('Could not create true color image buffer!');
}
}
/**
* Calculate the lost point
*
* @param QR_Code $qrCode
*
* @return number
*/
public function getLostPoint(QR_Code $qrCode)
{
$moduleCount = $qrCode->getModuleCount();
$lostPoint = 0;
// Level 1
for ($row = 0; $row < $moduleCount; $row++) {
for ($col = 0; $col < $moduleCount; $col++) {
$sameCount = 0;
$dark = $qrCode->isDark($row, $col);
for ($r = -1; $r <= 1; $r++) {
if ($row + $r < 0 || $moduleCount <= $row + $r) {
continue;
}
for ($c = -1; $c <= 1; $c++) {
if ($col + $c < 0 || $moduleCount <= $col + $c) {
continue;
}
if ($r == 0 && $c == 0) {
continue;
}
if ($dark == $qrCode->isDark($row + $r, $col + $c)) {
$sameCount++;
}
}
}
if ($sameCount > 5) {
$lostPoint += 3 + $sameCount - 5;
}
}
}
// Level 2
for ($row = 0; $row < $moduleCount - 1; $row++) {
for ($col = 0; $col < $moduleCount - 1; $col++) {
$count = 0;
if ($qrCode->isDark($row, $col)) {
$count++;
}
if ($qrCode->isDark($row + 1, $col)) {
$count++;
}
if ($qrCode->isDark($row, $col + 1)) {
$count++;
}
if ($qrCode->isDark($row + 1, $col + 1)) {
$count++;
}
if ($count == 0 || $count == 4) {
$lostPoint += 3;
}
}
}
// Level 3
for ($row = 0; $row < $moduleCount; $row++) {
for ($col = 0; $col < $moduleCount - 6; $col++) {
if ($qrCode->isDark($row, $col) && !$qrCode->isDark($row, $col + 1) && $qrCode->isDark($row, $col + 2) && $qrCode->isDark($row, $col + 3) && $qrCode->isDark($row, $col + 4) && !$qrCode->isDark($row, $col + 5) && $qrCode->isDark($row, $col + 6)) {
$lostPoint += 40;
}
}
}
for ($col = 0; $col < $moduleCount; $col++) {
for ($row = 0; $row < $moduleCount - 6; $row++) {
if ($qrCode->isDark($row, $col) && !$qrCode->isDark($row + 1, $col) && $qrCode->isDark($row + 2, $col) && $qrCode->isDark($row + 3, $col) && $qrCode->isDark($row + 4, $col) && !$qrCode->isDark($row + 5, $col) && $qrCode->isDark($row + 6, $col)) {
$lostPoint += 40;
}
}
}
// Level 4
$darkCount = 0;
for ($col = 0; $col < $moduleCount; $col++) {
for ($row = 0; $row < $moduleCount; $row++) {
if ($qrCode->isDark($row, $col)) {
$darkCount++;
}
}
}
$ratio = abs(100 * $darkCount / $moduleCount / $moduleCount - 50) / 5;
$lostPoint += $ratio * 10;
return $lostPoint;
}
