| protected calcTextMatrix ( ) : string | ||
| return | string | |
protected function calcTextMatrix()
{
// Define some variables.
$tm = '';
$a = '';
$b = '';
$c = '';
$d = '';
$neg = null;
// Determine is the rotate parameter is negative or not.
$neg = $this->textParams['rot'] < 0 ? true : false;
// Calculate the text matrix parameters.
$rot = abs($this->textParams['rot']);
if ($rot >= 0 && $rot <= 45) {
$factor = round($rot / 45, 2);
if ($neg) {
$a = 1;
$b = '-' . $factor;
$c = $factor;
$d = 1;
} else {
$a = 1;
$b = $factor;
$c = '-' . $factor;
$d = 1;
}
} else {
if ($rot > 45 && $rot <= 90) {
$factor = round((90 - $rot) / 45, 2);
if ($neg) {
$a = $factor;
$b = -1;
$c = 1;
$d = $factor;
} else {
$a = $factor;
$b = 1;
$c = -1;
$d = $factor;
}
}
}
// Adjust the text matrix parameters according to the horizontal and vertical scale parameters.
if ($this->textParams['h'] != 100) {
$a = round($a * ($this->textParams['h'] / 100), 2);
$b = round($b * ($this->textParams['h'] / 100), 2);
}
if ($this->textParams['v'] != 100) {
$c = round($c * ($this->textParams['v'] / 100), 2);
$d = round($d * ($this->textParams['v'] / 100), 2);
}
// Set the text matrix and return it.
$tm = "{$a} {$b} {$c} {$d}";
return $tm;
}