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Unforced quiet zone #63

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Unforced quiet zone #63

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14 changes: 10 additions & 4 deletions lib/qr_code/matrix_helper.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -4,16 +4,22 @@ defmodule QRCode.MatrixHelper do
"""
alias MatrixReloaded.Matrix

@spec surround_matrix(Matrix.t(), integer(), integer()) :: Matrix.t()
@spec surround_matrix(Matrix.t(), integer() | nil, integer()) :: Matrix.t()
def surround_matrix(matrix, quiet_zone, _value) when quiet_zone in [0, nil] do
matrix
end

def surround_matrix(matrix, quiet_zone, value)
when is_integer(quiet_zone) and quiet_zone >= 0 do
when is_integer(quiet_zone) and quiet_zone > 0 do
{rows, cols} = Matrix.size(matrix)

# Create new matrix with quiet zone
{:ok, new_matrix} = Matrix.new({rows + 2 * quiet_zone, cols + 2 * quiet_zone}, value)
{:ok, new_matrix} =
Matrix.new({rows + 2 * quiet_zone, cols + 2 * quiet_zone}, value)

# Copy qr code matrix to new matrix
{:ok, new_matrix} = Matrix.update_map(new_matrix, matrix, [{quiet_zone, quiet_zone}])
{:ok, new_matrix} =
Matrix.update_map(new_matrix, matrix, [{quiet_zone, quiet_zone}])

new_matrix
end
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