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-- $Date: 2004/02/23 08:22:06 $
-- $Revision: 1.12 $
-- $Author: jcrocholl $
package body Straights is
-- Create a straight line.
function Create
(To : in Vector) -- End point of the line.
return Line_Access is -- The newly created straight line.
begin
return new Straight'(To => To, Length => 0.0);
end Create;
-- Calculate the length of this line. Results are cached for
-- reuse. So make sure the starting point always remain the same
-- between calls.
function Length
(Start : in Vector; -- Starting point of the line.
This : access Straight) -- Get this line's length.
return Real is -- The distance from start to end point.
begin
if This.Length = 0.0 then
This.Length := abs(This.To - Start);
end if;
return This.Length;
end Length;
-- Scale a line by a given factor.
procedure Scale
(This : access Straight;
Factor : in Real) is
begin
This.To := This.To * Factor;
This.Length := This.Length * Factor;
end Scale;
-- Translate a line by a given offset.
procedure Translate
(This : access Straight; -- Translate this line.
Offset : in Vector) is -- Translating offset.
begin
This.To := This.To + Offset;
end Translate;
-- Get one point from a straight line.
function Way_Point
(Start : in Vector; -- Starting point of the line.
This : access Straight; -- Definition of the line.
Part : in Real) -- Parametrization variable from 0 to 1.
return Vector is -- The point on the line.
begin
return Start + Part * (This.To - Start);
end Way_Point;
-- Format a straight line for Scalable Vector Graphics output.
function To_SVG
(This : access Straight; -- Format this line.
Tolerance : in Real) -- Tolerance level.
return String is -- The resulting SVG code.
begin
return "L " & To_String(This.To, Tolerance);
end To_SVG;
-- Format a straight line for postscript output.
function To_Postscript
(This : access Straight; -- Format this line.
Tolerance : in Real) -- Tolerance level.
return String is -- The resulting Postscript code.
begin
return To_String(Mirror_Y(This.To), Tolerance) & " lineto";
end To_Postscript;
end Straights;