90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/* SPDX-FileCopyrightText: 2001-2002 NaN Holding BV. All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup bli
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*/
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#include "DNA_vec_types.h"
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#include "BLI_math_base.h"
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#include "BLI_math_geom.h"
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#include "BLI_strict_flags.h"
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#include "BLI_lasso_2d.h" /* own include */
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void BLI_lasso_boundbox(rcti *rect, const int mcoords[][2], const uint mcoords_len)
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{
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uint a;
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rect->xmin = rect->xmax = mcoords[0][0];
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rect->ymin = rect->ymax = mcoords[0][1];
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for (a = 1; a < mcoords_len; a++) {
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if (mcoords[a][0] < rect->xmin) {
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rect->xmin = mcoords[a][0];
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}
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else if (mcoords[a][0] > rect->xmax) {
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rect->xmax = mcoords[a][0];
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}
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if (mcoords[a][1] < rect->ymin) {
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rect->ymin = mcoords[a][1];
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}
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else if (mcoords[a][1] > rect->ymax) {
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rect->ymax = mcoords[a][1];
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}
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}
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}
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bool BLI_lasso_is_point_inside(const int mcoords[][2],
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const uint mcoords_len,
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const int sx,
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const int sy,
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const int error_value)
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{
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if (sx == error_value || mcoords_len == 0) {
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return false;
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}
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const int pt[2] = {sx, sy};
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return isect_point_poly_v2_int(pt, mcoords, mcoords_len);
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}
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bool BLI_lasso_is_edge_inside(const int mcoords[][2],
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const uint mcoords_len,
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int x0,
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int y0,
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int x1,
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int y1,
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const int error_value)
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{
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if (x0 == error_value || x1 == error_value || mcoords_len == 0) {
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return false;
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}
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const int v1[2] = {x0, y0}, v2[2] = {x1, y1};
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/* check points in lasso */
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if (BLI_lasso_is_point_inside(mcoords, mcoords_len, v1[0], v1[1], error_value)) {
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return true;
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}
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if (BLI_lasso_is_point_inside(mcoords, mcoords_len, v2[0], v2[1], error_value)) {
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return true;
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}
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/* no points in lasso, so we have to intersect with lasso edge */
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if (isect_seg_seg_v2_int(mcoords[0], mcoords[mcoords_len - 1], v1, v2) > 0) {
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return true;
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}
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for (uint a = 0; a < mcoords_len - 1; a++) {
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if (isect_seg_seg_v2_int(mcoords[a], mcoords[a + 1], v1, v2) > 0) {
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return true;
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}
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}
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return false;
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}
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