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https://github.com/moparisthebest/Simba
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106 lines
2.8 KiB
ObjectPascal
106 lines
2.8 KiB
ObjectPascal
{
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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(const P: TPointArray;const A, cx, cy: Extended): TPointArray;
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function RotatePoint(const p: TPoint;const angle, mx, my: Extended): TPoint;
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function ChangeDistPT(const PT : TPoint; mx,my : integer; newdist : extended) : TPoint;
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function ChangeDistTPA(var TPA : TPointArray; mx,my : integer; newdist : extended) : boolean;
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implementation
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uses
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math;
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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(const P: TPointArray;const 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(const p: TPoint;const 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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function ChangeDistPT(const PT : TPoint; mx,my : integer; newdist : extended) : TPoint;
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var
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angle : extended;
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begin
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angle := ArcTan2(pt.y-my,pt.x-mx);
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result.y := round(sin(angle) * newdist) + mx;
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result.x := round(cos(angle) * newdist) + my;
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end;
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function ChangeDistTPA(var TPA : TPointArray; mx,my : integer; newdist : extended) : boolean;
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var
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angle : extended;
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i : integer;
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begin
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result := false;
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if length(TPA) < 1 then
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exit;
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result := true;
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try
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for i := high(TPA) downto 0 do
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begin
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angle := ArcTan2(TPA[i].y-my,TPA[i].x-mx);
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TPA[i].y := round(sin(angle) * newdist) + mx;
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TPA[i].x := round(cos(angle) * newdist) + my;
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end;
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except
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result := false;
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end;
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end;
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end.
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