Module | PDF::Math |
In: |
lib/pdf/math.rb
|
Encapsulate some of the mathematical calculations that need to be performed when working with PDF documents. All angles in PDF::Writer are measured in degrees, but all angles in PDF documents are in radians. The standard conversions between radians, degrees, and gradians are provided.
As with the Perl implementations of these conversions, they will be wrapped in the range of the target measurement (0..PI2 for radians, 0..360 for degrees, and 0..400 for gradians). To prevent this wrapping, provide a false value for the wrap parameter.
To wrap these values manually, use rad2rad, deg2deg, or grad2grad.
PI2 | = | ::Math::PI * 2.0 | ||
DR | = | PI2 / 360.0 | One degree of arc measured in terms of radians. | |
RD | = | 360 / PI2 | One radian of arc, measured in terms of degrees. | |
DG | = | 400 / 360.0 | One degree of arc, measured in terms of gradians. | |
GD | = | 360 / 400.0 | One gradian of arc, measured in terms of degrees. | |
RG | = | 400 / PI2 | One radian of arc, measured in terms of gradians. | |
GR | = | PI2 / 400.0 | One gradian of arc, measured in terms of radians. |
Wrap degree values within the range of degrees (0..360).
# File lib/pdf/math.rb, line 51 51: def deg2deg(deg) 52: remt(deg, 360) 53: end
Convert degrees to gradians. The value will be constrained to the range of gradians (0..400) unless wrap is false.
# File lib/pdf/math.rb, line 70 70: def deg2grad(deg, wrap = true) 71: grad = DG * deg 72: grad = grad2grad(grad) if wrap 73: grad 74: end
Convert degrees to radians. The value will be constrained to the range of radians (0..PI2) unless wrap is false.
# File lib/pdf/math.rb, line 62 62: def deg2rad(deg, wrap = true) 63: rad = DR * deg 64: rad = rad2rad(rad) if wrap 65: rad 66: end
Convert gradians to degrees. The value will be constrained to the range of degrees (0..360) unless wrap is false.
# File lib/pdf/math.rb, line 94 94: def grad2deg(grad, wrap = true) 95: deg = GD * grad 96: deg = deg2deg(deg) if wrap 97: deg 98: end
Wrap gradian values within the range of gradians (0..400).
# File lib/pdf/math.rb, line 56 56: def grad2grad(grad) 57: remt(grad, 400) 58: end
Convert gradians to radians. The value will be constrained to the range of radians (0..PI2) unless wrap is false.
# File lib/pdf/math.rb, line 102 102: def grad2rad(grad, wrap = true) 103: rad = GR * grad 104: rad = rad2rad(rad) if wrap 105: rad 106: end
Convert radians to degrees. The value will be constrained to the range of degrees (0..360) unless wrap is false.
# File lib/pdf/math.rb, line 78 78: def rad2deg(rad, wrap = true) 79: deg = RD * rad 80: deg = deg2deg(deg) if wrap 81: deg 82: end
Convert radians to gradians. The value will be constrained to the range of gradians (0..400) unless wrap is false.
# File lib/pdf/math.rb, line 86 86: def rad2grad(rad, wrap = true) 87: grad = RG * rad 88: grad = grad2grad(grad) if wrap 89: grad 90: end
Wrap radian values within the range of radians (0..PI2).
# File lib/pdf/math.rb, line 46 46: def rad2rad(rad) 47: remt(rad, PI2) 48: end