## Predefined Variables

Name | Meaning
--- | ---
current | The current point [x, y] that is being processed in the formula section
$count | The number of times the formula section's while loop has been executed
$current_column | The currently being processed column, [0 -> $mapping_y_pixels)
$current_row | The currently being processed row, [0 -> $mapping_x_pixels)
$mapping_x_start | starting x coordinate supplied in the 'mapping' section
$mapping_y_start | starting y coordinate supplied in the 'mapping' section
$mapping_x_end | ending x coordinate supplied in the 'mapping' section
$mapping_y_end | ending y coordinate supplied in the 'mapping' section
$mapping_x_pixels | pixel width supplied in the 'mapping' section
$mapping_y_pixels | pixel height supplied in the 'mapping' section
$m_e | euler's number (approximately 2.7182818284590452354)
$m_log2e | log (base 2) of euler's number
$m_log10e | log (base 10) of euler's number
$m_ln2 | natural log of 2
$m_ln10 | natural log of 10
$m_pi | pi (approximately 3.14159265358979323846)
$m_pi_2 | pi/2
$m_pi_4 | pi/4
$m_1_pi | 1/pi
$m_2_pi | 2/pi
$m_2_sqrtpi | 2/sqrt(pi)
$m_sqrt2 | sqrt(2)
$m_sqrt1_2 | 1/sqrt(2)

Additional information and details about current, $count and the mapping section can be found here