SlightPHP\SimpleCaptcha::WaveImage PHP Method

    protected function WaveImage()
    {
        // X-axis wave generation
        $xp = $this->scale * $this->Xperiod * rand(1, 3);
        $k = rand(0, 100);
        for ($i = 0; $i < $this->width * $this->scale; $i++) {
            imagecopy($this->im, $this->im, $i - 1, sin($k + $i / $xp) * ($this->scale * $this->Xamplitude), $i, 0, 1, $this->height * $this->scale);
        }
        // Y-axis wave generation
        $k = rand(0, 100);
        $yp = $this->scale * $this->Yperiod * rand(1, 2);
        for ($i = 0; $i < $this->height * $this->scale; $i++) {
            imagecopy($this->im, $this->im, sin($k + $i / $yp) * ($this->scale * $this->Yamplitude), $i - 1, 0, $i, $this->width * $this->scale, 1);
        }
    }