85 lines
3.3 KiB
C
85 lines
3.3 KiB
C
/****************************************************************************
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* apps/graphics/traveler/tools/libwld/wld_findplane.c
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* This file contains the logic to find the plane at the specified location
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* in the world plane list
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*
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* Copyright (C) 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/*************************************************************************
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* Included files
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*************************************************************************/
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#include <stdio.h>
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#include "wld_plane.h"
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/*************************************************************************
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* Public Functions
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*************************************************************************/
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/*************************************************************************
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* Name: wld_find_plane
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* Description:
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* This function finds the plane at the specified point in the world plane
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* list
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************************************************************************/
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rect_list_t *wld_find_plane(wld_coord_t h, wld_coord_t v, wld_coord_t plane,
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rect_head_t * list)
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{
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rect_list_t *rect;
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/* Search until we find the first occurrence of a rectangle in the specified
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* plane.
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*/
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for (rect = list->head;
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((rect) && (rect->d.plane < plane)); rect = rect->flink);
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/* Then look at every occurrence of rectangles at this plane or until a
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* rectangle containing the specified point is found.
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*/
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for (; ((rect) && (rect->d.plane == plane)); rect = rect->flink)
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{
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/* There is another rectangle in this plane. Check if the point lies
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* within the rectangle.
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*/
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if ((h >= rect->d.hstart) && (h <= rect->d.hend)
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&& (v >= rect->d.vstart) && (v <= rect->d.vend))
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return rect;
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}
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return NULL;
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}
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