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https://github.com/moparisthebest/Simba
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49 lines
1.0 KiB
ObjectPascal
49 lines
1.0 KiB
ObjectPascal
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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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