2 * Copyright (C) 2008 Patrik Gornicz, Gornicz_P (at) hotmail (dot) com.
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 /// ***** Public Methods *****
25 return x % y + (x < 0 ? y : 0);
39 float lineSize = (float) sqrt((x1 - x2) * (x1 - x2)
40 + (y1 - y2) * (y1 - y2));
42 return Vector2(x1 - vec.m_fX, y1 - vec.m_fY);
44 float u = ((vec.m_fX - x1) * (x2 - x1)
45 + (vec.m_fY - y1) * (y2 - y1)) / (lineSize * lineSize);
48 return Vector2(x1 - vec.m_fX, y1 - vec.m_fY);
50 return Vector2(x2 - vec.m_fX, y2 - vec.m_fY);
53 float ix = x1 + u * (x2 - x1);
54 float iy = y1 + u * (y2 - y1);
55 return Vector2(ix - vec.m_fX, iy - vec.m_fY);
59 Vector2 perp(const Vector2& vec)
61 return Vector2(-vec.m_fY, vec.m_fX);
64 float dot(const Vector2& vec1, const Vector2& vec2)
66 return vec1.m_fX * vec2.m_fX + vec1.m_fY * vec2.m_fY;
69 //TODO float Vector2::projectionCoeff(const Vector2* vec) const;
70 //TODO Vector2* Vector2::projection(const Vector2* vec) const;