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47ed8d321c
git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@2 3789f03b-4d11-0410-bbf8-ca57d06f2519
113 lines
4.1 KiB
C++
113 lines
4.1 KiB
C++
/* Copyright (C) 2002-2003 RealVNC Ltd. All Rights Reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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// rfb::Rect and rfb::Point structures
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#ifndef __RFB_RECT_INCLUDED__
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#define __RFB_RECT_INCLUDED__
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#ifndef max
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#define max(a,b) (((a) > (b)) ? (a) : (b))
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#endif
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#ifndef min
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#define min(a,b) (((a) < (b)) ? (a) : (b))
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#endif
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namespace rfb {
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// rfb::Point
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//
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// Represents a point in 2D space, by X and Y coordinates.
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// Can also be used to represent a delta, or offset, between
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// two Points.
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// Functions are provided to allow Points to be compared for
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// equality and translated by a supplied offset.
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// Functions are also provided to negate offset Points.
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struct Point {
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Point() : x(0), y(0) {}
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Point(int x_, int y_) : x(x_), y(y_) {}
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inline Point negate() const {return Point(-x, -y);}
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inline bool equals(const Point &p) const {return x==p.x && y==p.y;}
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inline Point translate(const Point &p) const {return Point(x+p.x, y+p.y);}
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inline Point subtract(const Point &p) const {return Point(x-p.x, y-p.y);}
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int x, y;
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};
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// rfb::Rect
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//
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// Represents a rectangular region defined by its top-left (tl)
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// and bottom-right (br) Points.
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// Rects may be compared for equality, checked to determine whether
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// or not they are empty, cleared (made empty), or intersected with
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// one another. The bounding rectangle of two existing Rects
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// may be calculated, as may the area of a Rect.
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// Rects may also be translated, in the same way as Points, by
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// an offset specified in a Point structure.
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struct Rect {
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Rect() {}
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Rect(Point tl_, Point br_) : tl(tl_), br(br_) {}
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Rect(int x1, int y1, int x2, int y2) : tl(x1, y1), br(x2, y2) {}
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inline void setXYWH(int x, int y, int w, int h) {
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tl.x = x; tl.y = y; br.x = x+w; br.y = y+h;
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}
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inline Rect intersect(const Rect &r) const {
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Rect result;
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result.tl.x = max(tl.x, r.tl.x);
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result.tl.y = max(tl.y, r.tl.y);
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result.br.x = max(min(br.x, r.br.x), result.tl.x);
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result.br.y = max(min(br.y, r.br.y), result.tl.y);
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return result;
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}
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inline Rect union_boundary(const Rect &r) const {
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if (r.is_empty()) return *this;
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if (is_empty()) return r;
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Rect result;
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result.tl.x = min(tl.x, r.tl.x);
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result.tl.y = min(tl.y, r.tl.y);
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result.br.x = max(br.x, r.br.x);
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result.br.y = max(br.y, r.br.y);
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return result;
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}
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inline Rect translate(const Point &p) const {
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return Rect(tl.translate(p), br.translate(p));
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}
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inline bool equals(const Rect &r) const {return r.tl.equals(tl) && r.br.equals(br);}
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inline bool is_empty() const {return (tl.x >= br.x) || (tl.y >= br.y);}
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inline void clear() {tl = Point(); br = Point();}
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inline bool enclosed_by(const Rect &r) const {
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return (tl.x>=r.tl.x) && (tl.y>=r.tl.y) && (br.x<=r.br.x) && (br.y<=r.br.y);
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}
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inline bool overlaps(const Rect &r) const {
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return tl.x < r.br.x && tl.y < r.br.y && br.x > r.tl.x && br.y > r.tl.y;
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}
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inline unsigned int area() const {return is_empty() ? 0 : (br.x-tl.x)*(br.y-tl.y);}
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inline Point dimensions() const {return Point(width(), height());}
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inline int width() const {return br.x-tl.x;}
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inline int height() const {return br.y-tl.y;}
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inline bool contains(const Point &p) const {
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return (tl.x<=p.x) && (tl.y<=p.y) && (br.x>p.x) && (br.y>p.y);
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}
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Point tl;
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Point br;
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};
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}
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#endif // __RFB_RECT_INCLUDED__
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