115 lines
4.6 KiB
C
115 lines
4.6 KiB
C
/****************************************************************************
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* libs/libnx/nxglib/nxglib_nonintersecting.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <nuttx/config.h>
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#include <nuttx/nx/nxglib.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxgl_nonintersecting
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*
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* Description:
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* Return the regions of rectangle rect 1 that do not intersect with
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* rect2. This may be up to founr rectangles some of which may be
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* degenerate (and can be picked off with nxgl_nullrect)
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*
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****************************************************************************/
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void nxgl_nonintersecting(FAR struct nxgl_rect_s result[4],
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FAR const struct nxgl_rect_s *rect1,
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FAR const struct nxgl_rect_s *rect2)
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{
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struct nxgl_rect_s intersection;
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/* Get the intersection of the two rectangles */
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nxgl_rectintersect(&intersection, rect1, rect2);
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/* Then return the four rectangles representing the regions NON included
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* in the intersection. Some of these rectangles may be invalid (zero
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* area), but those can be picked off using nxgl_nullrect()
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*
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* rect1.pt1
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* +-------------------------+
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* | rect2.pt1 |
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* | int.pt1 |
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* | +-------------------------+
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* | | | |
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* | | | |
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* +-------------------------+ |
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* | rect1.pt2 |
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* | int.pt2 |
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* +-------------------------+
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* rect2.pt2
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* rect1.pt1
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* +-------------------------+
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* rect2.pt1 |int.pt1 |
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* +---------+---------------+ |
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* | | | |
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* | | | |
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* | | |int.pt2 |
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* | +---------------+---------+
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* | | rect1.pt2
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* +-------------------------+
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* rect2.pt2
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* rect2.pt1
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* +-------------------------+
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* | rect1.pt1 |
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* | int.pt1 |
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* | +-------------------------+
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* | | | |
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* | | | |
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* | | | |
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* +---------+---------------+ |
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* | rect2.pt2 |
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* | int.pt2 |
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* +-------------------------+
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* rect1.pt2
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*/
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result[NX_TOP_NDX].pt1.x = rect1->pt1.x;
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result[NX_TOP_NDX].pt1.y = rect1->pt1.y;
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result[NX_TOP_NDX].pt2.x = rect1->pt2.x;
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result[NX_TOP_NDX].pt2.y = intersection.pt1.y - 1;
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result[NX_BOTTOM_NDX].pt1.x = rect1->pt1.x;
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result[NX_BOTTOM_NDX].pt1.y = intersection.pt2.y + 1;
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result[NX_BOTTOM_NDX].pt2.x = rect1->pt2.x;
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result[NX_BOTTOM_NDX].pt2.y = rect1->pt2.y;
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result[NX_LEFT_NDX].pt1.x = rect1->pt1.x;
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result[NX_LEFT_NDX].pt1.y = intersection.pt1.y;
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result[NX_LEFT_NDX].pt2.x = intersection.pt1.x - 1;
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result[NX_LEFT_NDX].pt2.y = intersection.pt2.y;
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result[NX_RIGHT_NDX].pt1.x = intersection.pt2.x + 1;
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result[NX_RIGHT_NDX].pt1.y = intersection.pt1.y;
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result[NX_RIGHT_NDX].pt2.x = rect1->pt2.x;
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result[NX_RIGHT_NDX].pt2.y = intersection.pt2.y;
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}
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