rct.c

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/*
 * 
 * rct.c
 * 
 * april 95
 * 
 * $Id: rct.c 36836 2011-05-23 14:51:31Z blendix $
 *
 * A minimalist lib for functions doing stuff with rectangle structs.
 *
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 *
 */

#include <stdio.h>
#include <math.h>

#include "DNA_vec_types.h"
#include "BLI_rect.h"

int BLI_rcti_is_empty(rcti * rect)
{
        return ((rect->xmax<=rect->xmin) ||
                        (rect->ymax<=rect->ymin));
}

int BLI_rctf_is_empty(rctf * rect)
{
        return ((rect->xmax<=rect->xmin) ||
                        (rect->ymax<=rect->ymin));
}

int BLI_in_rcti(rcti * rect, int x, int y)
{

        if(x<rect->xmin) return 0;
        if(x>rect->xmax) return 0;
        if(y<rect->ymin) return 0;
        if(y>rect->ymax) return 0;
        return 1;
}

int BLI_in_rctf(rctf *rect, float x, float y)
{

        if(x<rect->xmin) return 0;
        if(x>rect->xmax) return 0;
        if(y<rect->ymin) return 0;
        if(y>rect->ymax) return 0;
        return 1;
}

void BLI_union_rctf(rctf *rct1, rctf *rct2)
{
        
        if(rct1->xmin>rct2->xmin) rct1->xmin= rct2->xmin;
        if(rct1->xmax<rct2->xmax) rct1->xmax= rct2->xmax;
        if(rct1->ymin>rct2->ymin) rct1->ymin= rct2->ymin;
        if(rct1->ymax<rct2->ymax) rct1->ymax= rct2->ymax;
}

void BLI_union_rcti(rcti *rct1, rcti *rct2)
{
        
        if(rct1->xmin>rct2->xmin) rct1->xmin= rct2->xmin;
        if(rct1->xmax<rct2->xmax) rct1->xmax= rct2->xmax;
        if(rct1->ymin>rct2->ymin) rct1->ymin= rct2->ymin;
        if(rct1->ymax<rct2->ymax) rct1->ymax= rct2->ymax;
}

void BLI_init_rctf(rctf *rect, float xmin, float xmax, float ymin, float ymax)
{
        if(xmin <= xmax) {
                rect->xmin= xmin;
                rect->xmax= xmax;
        }
        else {
                rect->xmax= xmin;
                rect->xmin= xmax;
        }
        if(ymin <= ymax) {
                rect->ymin= ymin;
                rect->ymax= ymax;
        }
        else {
                rect->ymax= ymin;
                rect->ymin= ymax;
        }
}

void BLI_init_rcti(rcti *rect, int xmin, int xmax, int ymin, int ymax)
{
        if(xmin <= xmax) {
                rect->xmin= xmin;
                rect->xmax= xmax;
        }
        else {
                rect->xmax= xmin;
                rect->xmin= xmax;
        }
        if(ymin <= ymax) {
                rect->ymin= ymin;
                rect->ymax= ymax;
        }
        else {
                rect->ymax= ymin;
                rect->ymin= ymax;
        }
}

void BLI_translate_rcti(rcti *rect, int x, int y)
{
        rect->xmin += x;
        rect->ymin += y;
        rect->xmax += x;
        rect->ymax += y;
}
void BLI_translate_rctf(rctf *rect, float x, float y)
{
        rect->xmin += x;
        rect->ymin += y;
        rect->xmax += x;
        rect->ymax += y;
}

/* change width & height around the central location */
void BLI_resize_rcti(rcti *rect, int x, int y)
{
        rect->xmin= rect->xmax= (rect->xmax + rect->xmin) / 2;
        rect->ymin= rect->ymax= (rect->ymax + rect->ymin) / 2;
        rect->xmin -= x / 2;
        rect->ymin -= y / 2;
        rect->xmax= rect->xmin + x;
        rect->ymax= rect->ymin + y;
}

void BLI_resize_rctf(rctf *rect, float x, float y)
{
        rect->xmin= rect->xmax= (rect->xmax + rect->xmin) * 0.5f;
        rect->ymin= rect->ymax= (rect->ymax + rect->ymin) * 0.5f;
        rect->xmin -= x * 0.5f;
        rect->ymin -= y * 0.5f;
        rect->xmax= rect->xmin + x;
        rect->ymax= rect->ymin + y;
}

int BLI_isect_rctf(rctf *src1, rctf *src2, rctf *dest)
{
        float xmin, xmax;
        float ymin, ymax;

        xmin = (src1->xmin) > (src2->xmin) ? (src1->xmin) : (src2->xmin);
        xmax = (src1->xmax) < (src2->xmax) ? (src1->xmax) : (src2->xmax);
        ymin = (src1->ymin) > (src2->ymin) ? (src1->ymin) : (src2->ymin);
        ymax = (src1->ymax) < (src2->ymax) ? (src1->ymax) : (src2->ymax);
        
        if(xmax>=xmin && ymax>=ymin) {
                if(dest) {
                        dest->xmin = xmin;
                        dest->xmax = xmax;
                        dest->ymin = ymin;
                        dest->ymax = ymax;
                }
                return 1;
        }
        else {
                if(dest) {
                        dest->xmin = 0;
                        dest->xmax = 0;
                        dest->ymin = 0;
                        dest->ymax = 0;
                }
                return 0;
        }
}

int BLI_isect_rcti(rcti *src1, rcti *src2, rcti *dest)
{
        int xmin, xmax;
        int ymin, ymax;
        
        xmin = (src1->xmin) > (src2->xmin) ? (src1->xmin) : (src2->xmin);
        xmax = (src1->xmax) < (src2->xmax) ? (src1->xmax) : (src2->xmax);
        ymin = (src1->ymin) > (src2->ymin) ? (src1->ymin) : (src2->ymin);
        ymax = (src1->ymax) < (src2->ymax) ? (src1->ymax) : (src2->ymax);
        
        if(xmax>=xmin && ymax>=ymin) {
                if(dest) {
                        dest->xmin = xmin;
                        dest->xmax = xmax;
                        dest->ymin = ymin;
                        dest->ymax = ymax;
                }
                return 1;
        }
        else {
                if(dest) {
                        dest->xmin = 0;
                        dest->xmax = 0;
                        dest->ymin = 0;
                        dest->ymax = 0;
                }
                return 0;
        }
}

void BLI_copy_rcti_rctf(rcti *tar, const rctf *src)
{
        tar->xmin= floor(src->xmin + 0.5);
        tar->xmax= floor((src->xmax - src->xmin) + 0.5);
        tar->ymin= floor(src->ymin + 0.5);
        tar->ymax= floor((src->ymax - src->ymin) + 0.5);
}

void print_rctf(const char *str, rctf *rect)
{
        printf("%s: xmin %.3f, xmax %.3f, ymin %.3f, ymax %.3f (%.3fx%.3f)\n", str, rect->xmin, rect->xmax, rect->ymin, rect->ymax, rect->xmax - rect->xmin, rect->ymax - rect->ymin);
}

void print_rcti(const char *str, rcti *rect)
{
        printf("%s: xmin %d, xmax %d, ymin %d, ymax %d (%dx%d)\n", str, rect->xmin, rect->xmax, rect->ymin, rect->ymax, rect->xmax - rect->xmin, rect->ymax - rect->ymin);
}