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-- $Date: 2004/02/02 09:01:43 $
-- $Revision: 1.15 $
-- $Author: jcrocholl $
with Real_Numbers; use Real_Numbers;
with Real_Vectors; use Real_Vectors;
with Lines; use Lines;
-- Cubic bezier curves.
package Cubics is
-- Cubic bezier curve. Extends Line with two control points.
type Cubic is new Line with record
Control_A, Control_B : Vector;
end record;
-- Access type for cubic bezier curves.
type Cubic_Access is access all Cubic;
-- Create a cubic bezier curve.
function Create
(To : in Vector; -- End point of the curve.
Control_A : in Vector; -- First control point of curve.
Control_B : in Vector) -- Second control point of curve.
return Line_Access; -- The newly created curve.
-- Calculate the arc length of this curve. Results are cached for
-- reuse. So make sure the starting point always remains the same
-- between calls.
function Length
(Start : in Vector; -- Starting point of the curve.
This : access Cubic) -- Get this curve's arc length.
return Real; -- The length of the arc.
-- Scale a curve by a given factor.
procedure Scale
(This : access Cubic; -- Scale this curve.
Factor : in Real); -- Scaling factor.
-- Translate a curve by a given offset.
procedure Translate
(This : access Cubic; -- Translate this curve.
Offset : in Vector); -- Translating offset.
-- Get one point from the cubic bezier curve.
function Way_Point
(Start : in Vector; -- Starting point of the curve.
This : access Cubic; -- Definition of the curve.
Part : in Real) -- Parametrization variable from 0 to 1.
return Vector; -- The point on the curve.
-- Format a cubic bezier curve for Scalable Vector Graphics output.
function To_SVG
(This : access Cubic; -- Format this curve.
Tolerance : in Real) -- Tolerance level.
return String; -- The resulting SVG code.
-- Format a cubic bezier curve for postscript output.
function To_Postscript
(This : access Cubic; -- Format this curve.
Tolerance : in Real) -- Tolerance level.
return String; -- The resulting Postscript code.
end Cubics;