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mmath

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git-svn-id: http://www.villavu.com/repositories/merlijn/mufasa@108 3f818213-9676-44b0-a9b4-5e4c4e03d09d
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Wizzup? 2009-10-06 03:42:52 +00:00
parent b970995a3d
commit 5015ece4e2
1 changed files with 48 additions and 0 deletions
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Units/MMLCore/mmath.pas Normal file
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unit mmath;
// mufasa math
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils,MufasaTypes;
function RotatePoints(P: TPointArray; A, cx, cy: Extended): TPointArray;
function RotatePoint(p: TPoint; angle, mx, my: Extended): TPoint;
implementation
{/\
Rotates the given points (P) by A (in radians) around the point defined by cx, cy.
/\}
function RotatePoints(P: TPointArray; A, cx, cy: Extended): TPointArray;
var
I, L: Integer;
begin
L := High(P);
SetLength(Result, L + 1);
for I := 0 to L do
begin
Result[I].X := Round(cx + cos(A) * (p[i].x - cx) - sin(A) * (p[i].y - cy));
Result[I].Y := Round(cy + sin(A) * (p[i].x - cx) + cos(A) * (p[i].y - cy));
end;
end;
{/\
Rotates the given point (p) by A (in radians) around the point defined by cx, cy.
/\}
function RotatePoint(p: TPoint; angle, mx, my: Extended): TPoint;
begin
Result.X := Round(mx + cos(angle) * (p.x - mx) - sin(angle) * (p.y - my));
Result.Y := Round(my + sin(angle) * (p.x - mx) + cos(angle) * (p.y- my));
end;
end.