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# File 'lib/prawn/svg/transform_parser.rb', line 2
def parse_transform_attribute(transform)
matrix = Matrix.identity(3)
parse_css_method_calls(transform).each do |name, arguments|
case name
when 'translate'
x, y = arguments
matrix *= Matrix[[1, 0, x_pixels(x.to_f)], [0, 1, -y_pixels(y.to_f)], [0, 0, 1]]
when 'translateX'
x = arguments.first
matrix *= Matrix[[1, 0, x_pixels(x.to_f)], [0, 1, 0], [0, 0, 1]]
when 'translateY'
y = arguments.first
matrix *= Matrix[[1, 0, 0], [0, 1, -y_pixels(y.to_f)], [0, 0, 1]]
when 'rotate'
angle, x, y = arguments.collect(&:to_f)
angle = angle * Math::PI / 180.0
case arguments.length
when 1
matrix *= Matrix[[Math.cos(angle), Math.sin(angle), 0], [-Math.sin(angle), Math.cos(angle), 0], [0, 0, 1]]
when 3
matrix *= Matrix[[1, 0, x_pixels(x.to_f)], [0, 1, -y_pixels(y.to_f)], [0, 0, 1]]
matrix *= Matrix[[Math.cos(angle), Math.sin(angle), 0], [-Math.sin(angle), Math.cos(angle), 0], [0, 0, 1]]
matrix *= Matrix[[1, 0, -x_pixels(x.to_f)], [0, 1, y_pixels(y.to_f)], [0, 0, 1]]
else
warnings << "transform 'rotate' must have either one or three arguments"
end
when 'scale'
x_scale = arguments[0].to_f
y_scale = (arguments[1] || x_scale).to_f
matrix *= Matrix[[x_scale, 0, 0], [0, y_scale, 0], [0, 0, 1]]
when 'skewX'
angle = arguments[0].to_f * Math::PI / 180.0
matrix *= Matrix[[1, -Math.tan(angle), 0], [0, 1, 0], [0, 0, 1]]
when 'skewY'
angle = arguments[0].to_f * Math::PI / 180.0
matrix *= Matrix[[1, 0, 0], [-Math.tan(angle), 1, 0], [0, 0, 1]]
when 'matrix'
if arguments.length == 6
a, b, c, d, e, f = arguments.collect(&:to_f)
matrix *= Matrix[[a, -c, e], [-b, d, -f], [0, 0, 1]]
else
warnings << "transform 'matrix' must have six arguments"
end
else
warnings << "Unknown/unsupported transformation '#{name}'; ignoring"
end
end
matrix.to_a[0..1].transpose.flatten
end
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