coords.h

swain-0.5.2.zip的源代码,比较好用,希望大家喜欢.

/*
This file is part of SWAIN (http://sourceforge.net/projects/swain).
Copyright (C) 2006  Daniel Lindstr鰉 and Daniel Nilsson

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA  02110-1301, USA.
*/
#pragma once

#include "math.h"

struct FPOINT {
	float x;
	float y;
};

struct FRECT {
	float left;
	float top;
	float right;
	float bottom;
};

inline bool intersectsFRECT(FRECT *r1, FRECT *r2) {
	return r1->bottom > r2->top && r1->top < r2->bottom
		&& r1->left < r2->right && r1->right > r2->left;
}

inline void intersectFRECT(FRECT *dst, FRECT *r1, FRECT *r2) {
	dst->left = max(r1->left, r2->left);
	dst->top = max(r1->top, r2->top);
	dst->right = min(r1->right, r2->right);
	dst->bottom = min(r1->bottom, r2->bottom);
}

inline void unionFRECT(FRECT *dst, FRECT *r1, FRECT *r2) {
	dst->left = min(r1->left, r2->left);
	dst->top = min(r1->top, r2->top);
	dst->right = max(r1->right, r2->right);
	dst->bottom = max(r1->bottom, r2->bottom);
}

inline void addPoint2Bound(FPOINT *p, FRECT *rect) {
	rect->left = min(rect->left, p->x);
	rect->right = max(rect->right, p->x);
	rect->top = min(rect->top, p->y);
	rect->bottom = max(rect->bottom, p->y);
}

inline double distance(POINT *p1, POINT *p2) {
	double dx = p2->x - p1->x;
	double dy = p2->y - p1->y;
	return sqrt(dx*dx + dy*dy);
}