source: mainline/uspace/lib/draw/path.c@ cf13b17

/*
 * Copyright (c) 2012 Petr Koupy
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup draw
 * @{
 */
/**
 * @file
 */

#include <assert.h>
#include <malloc.h>

#include "path.h"

struct path {
        list_t list;
        double cur_x;
        double cur_y;
};

void path_init(path_t *path)
{
        list_initialize(&path->list);
        path->cur_x = 0;
        path->cur_y = 0;
}

void path_clear(path_t *path)
{
        while (!list_empty(&path->list)) {
                path_step_t *step = (path_step_t *) list_last(&path->list);
                list_remove(&step->link);
                free(step);
        }
        path->cur_x = 0;
        path->cur_y = 0;
}

void path_get_cursor(path_t *path, double *x, double *y)
{
        assert(x);
        assert(y);

        *x = path->cur_x;
        *y = path->cur_y;
}

void path_move_to(path_t *path, double dx, double dy)
{
        path_step_t *step = (path_step_t *) malloc(sizeof(path_step_t));
        if (step) {
                path->cur_x += dx;
                path->cur_y += dy;
                link_initialize(&step->link);
                step->type = PATH_STEP_MOVETO;
                step->to_x = path->cur_x;
                step->to_y = path->cur_y;
                list_append(&step->link, &path->list);
                
        }
}

void path_line_to(path_t *path, double dx, double dy)
{
        path_step_t *step = (path_step_t *) malloc(sizeof(path_step_t));
        if (step) {
                path->cur_x += dx;
                path->cur_y += dy;
                link_initialize(&step->link);
                step->type = PATH_STEP_LINETO;
                step->to_x = path->cur_x;
                step->to_y = path->cur_y;
                list_append(&step->link, &path->list);
        }
}

void path_rectangle(path_t *path, double x, double y, double width, double height)
{
        path_move_to(path, x, y);
        path_line_to(path, width, 0);
        path_line_to(path, 0, height);
        path_line_to(path, -width, 0);
        path_line_to(path, 0, -height);
}

/** @}
 */