113 lines
2.1 KiB
C++
113 lines
2.1 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 GHOST
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*/
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#include "GHOST_Rect.hh"
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void GHOST_Rect::inset(int32_t i)
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{
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if (i > 0) {
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/* Grow the rectangle. */
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l_ -= i;
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r_ += i;
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t_ -= i;
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b_ += i;
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}
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else if (i < 0) {
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/* Shrink the rectangle, check for insets larger than half the size. */
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int32_t i2 = i * 2;
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if (getWidth() > i2) {
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l_ += i;
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r_ -= i;
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}
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else {
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l_ = l_ + ((r_ - l_) / 2);
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r_ = l_;
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}
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if (getHeight() > i2) {
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t_ += i;
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b_ -= i;
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}
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else {
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t_ = t_ + ((b_ - t_) / 2);
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b_ = t_;
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}
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}
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}
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GHOST_TVisibility GHOST_Rect::getVisibility(GHOST_Rect &r) const
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{
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bool lt = isInside(r.l_, r.t_);
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bool rt = isInside(r.r_, r.t_);
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bool lb = isInside(r.l_, r.b_);
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bool rb = isInside(r.r_, r.b_);
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GHOST_TVisibility v;
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if (lt && rt && lb && rb) {
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/* All points inside, rectangle is inside this. */
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v = GHOST_kFullyVisible;
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}
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else if (!(lt || rt || lb || rb)) {
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/* None of the points inside.
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* Check to see whether the rectangle is larger than this one. */
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if ((r.l_ < l_) && (r.t_ < t_) && (r.r_ > r_) && (r.b_ > b_)) {
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v = GHOST_kPartiallyVisible;
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}
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else {
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v = GHOST_kNotVisible;
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}
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}
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else {
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/* Some of the points inside, rectangle is partially inside. */
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v = GHOST_kPartiallyVisible;
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}
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return v;
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}
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void GHOST_Rect::setCenter(int32_t cx, int32_t cy)
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{
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int32_t offset = cx - (l_ + (r_ - l_) / 2);
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l_ += offset;
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r_ += offset;
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offset = cy - (t_ + (b_ - t_) / 2);
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t_ += offset;
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b_ += offset;
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}
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void GHOST_Rect::setCenter(int32_t cx, int32_t cy, int32_t w, int32_t h)
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{
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long w_2, h_2;
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w_2 = w >> 1;
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h_2 = h >> 1;
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l_ = cx - w_2;
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t_ = cy - h_2;
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r_ = l_ + w;
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b_ = t_ + h;
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}
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bool GHOST_Rect::clip(GHOST_Rect &r) const
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{
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bool clipped = false;
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if (r.l_ < l_) {
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r.l_ = l_;
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clipped = true;
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}
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if (r.t_ < t_) {
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r.t_ = t_;
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clipped = true;
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}
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if (r.r_ > r_) {
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r.r_ = r_;
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clipped = true;
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}
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if (r.b_ > b_) {
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r.b_ = b_;
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clipped = true;
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}
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return clipped;
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}
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