mirror of
https://github.com/moparisthebest/Simba
synced 2024-08-13 16:53:59 -04:00
49 lines
1.0 KiB
ObjectPascal
49 lines
1.0 KiB
ObjectPascal
|
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.
|
||
|
|
|