72 lines
1.9 KiB
Plaintext
72 lines
1.9 KiB
Plaintext
{
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This file is part of the Mufasa Macro Library (MML)
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Copyright (c) 2009 by Raymond van Venetië and Merlijn Wajer
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MML is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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MML is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with MML. If not, see <http://www.gnu.org/licenses/>.
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See the file COPYING, included in this distribution,
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for details about the copyright.
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Mufasa Math Unit for the Mufasa Macro Library
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}
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unit mmath;
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// mufasa math
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{$mode objfpc}{$H+}
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interface
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uses
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Classes, SysUtils,MufasaTypes;
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function RotatePoints(P: TPointArray; A, cx, cy: Extended): TPointArray;
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function RotatePoint(p: TPoint; angle, mx, my: Extended): TPoint;
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implementation
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{/\
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Rotates the given points (P) by A (in radians) around the point defined by cx, cy.
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/\}
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function RotatePoints(P: TPointArray; A, cx, cy: Extended): TPointArray;
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var
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I, L: Integer;
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begin
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L := High(P);
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SetLength(Result, L + 1);
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for I := 0 to L do
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begin
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Result[I].X := Round(cx + cos(A) * (p[i].x - cx) - sin(A) * (p[i].y - cy));
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Result[I].Y := Round(cy + sin(A) * (p[i].x - cx) + cos(A) * (p[i].y - cy));
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end;
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end;
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{/\
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Rotates the given point (p) by A (in radians) around the point defined by cx, cy.
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/\}
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function RotatePoint(p: TPoint; angle, mx, my: Extended): TPoint;
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begin
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Result.X := Round(mx + cos(angle) * (p.x - mx) - sin(angle) * (p.y - my));
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Result.Y := Round(my + sin(angle) * (p.x - mx) + cos(angle) * (p.y- my));
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end;
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end.
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