1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/* ScummVM - Scumm Interpreter
* Copyright (C) 2002-2006 The ScummVM project
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#ifndef COMMON_RECT_H
#define COMMON_RECT_H
#include "common/scummsys.h"
#include "common/util.h"
namespace Common {
/*! @brief simple class for handling both 2D position and size
This small class is an helper for position and size values.
*/
struct Point {
int16 x; //!< The horizontal part of the point
int16 y; //!< The vertical part of the point
Point() : x(0), y(0) {};
Point(const Point &p) : x(p.x), y(p.y) {};
explicit Point(int16 x1, int16 y1) : x(x1), y(y1) {};
Point & operator=(const Point & p) { x = p.x; y = p.y; return *this; };
bool operator==(const Point & p) const { return x == p.x && y == p.y; };
bool operator!=(const Point & p) const { return x != p.x || y != p.y; };
/**
* Return the square of the distance between this point and the point p.
*
* @param p the other point
* @return the distance between this and p
*/
uint sqrDist(const Point & p) const {
int diffx = ABS(p.x - x);
if (diffx >= 0x1000)
return 0xFFFFFF;
int diffy = ABS(p.y - y);
if (diffy >= 0x1000)
return 0xFFFFFF;
return diffx*diffx + diffy*diffy;
}
};
/*! @brief simple class for handling a rectangular zone.
This small class is an helper for rectangles.
Note: This implementation is built around the assumption that (top,left) is
part of the rectangle, but (bottom,right) is not! This is reflected in
various methods, including contains(), intersects() and others.
Another very wide spread approach to rectangle classes treats (bottom,right)
also as a part of the rectangle.
Coneptually, both are sound, but the approach we use saves many intermediate
computations (like computing the height in our case is done by doing this:
height = bottom - top;
while in the alternate system, it would be
height = bottom - top + 1;
When writing code using our Rect class, always keep this principle in mind!
*/
struct Rect {
int16 top, left; //!< The point at the top left of the rectangle (part of the rect).
int16 bottom, right; //!< The point at the bottom right of the rectangle (not part of the rect).
Rect() : top(0), left(0), bottom(0), right(0) {}
Rect(int16 w, int16 h) : top(0), left(0), bottom(h), right(w) {}
Rect(int16 x1, int16 y1, int16 x2, int16 y2) : top(y1), left(x1), bottom(y2), right(x2) {
assert(isValidRect());
}
int16 width() const { return right - left; }
int16 height() const { return bottom - top; }
void setWidth(int16 aWidth) {
right = left + aWidth;
}
void setHeight(int16 aHeight) {
bottom = top + aHeight;
}
/*! @brief check if given position is inside this rectangle
@param x the horizontal position to check
@param y the vertical position to check
@return true if the given position is inside this rectangle, false otherwise
*/
bool contains(int16 x, int16 y) const {
return (left <= x) && (x < right) && (top <= y) && (y < bottom);
}
/*! @brief check if given point is inside this rectangle
@param p the point to check
@return true if the given point is inside this rectangle, false otherwise
*/
bool contains(const Point &p) const {
return contains(p.x, p.y);
}
/*! @brief check if given rectangle intersects with this rectangle
@param r the rectangle to check
@return true if the given rectangle is inside the rectangle, false otherwise
*/
bool intersects(const Rect &r) const {
return (left < r.right) && (r.left < right) && (top < r.bottom) && (r.top < bottom);
}
/*! @brief extend this rectangle so that it contains r
@param r the rectangle to extend by
*/
void extend(const Rect &r) {
left = MIN(left, r.left);
right = MAX(right, r.right);
top = MIN(top, r.top);
bottom = MAX(bottom, r.bottom);
}
/*! @brief extend this rectangle in all four directions by the given number of pixels
@param offset the size to grow by
*/
void grow(int16 offset) {
top -= offset;
left -= offset;
bottom += offset;
right += offset;
}
void clip(const Rect &r) {
assert(isValidRect());
assert(r.isValidRect());
if (top < r.top) top = r.top;
else if (top > r.bottom) top = r.bottom;
if (left < r.left) left = r.left;
else if (left > r.right) left = r.right;
if (bottom > r.bottom) bottom = r.bottom;
else if (bottom < r.top) bottom = r.top;
if (right > r.right) right = r.right;
else if (right < r.left) right = r.left;
}
void clip(int maxw, int maxh) {
clip(Rect(0, 0, maxw, maxh));
}
bool isValidRect() const {
return (left <= right && top <= bottom);
}
void moveTo(int16 x, int16 y) {
bottom += y - top;
right += x - left;
top = y;
left = x;
}
void translate(int16 dx, int16 dy) {
left += dx; right += dx;
top += dy; bottom += dy;
}
void moveTo(const Point &p) {
moveTo(p.x, p.y);
}
void debugPrint(int debuglevel = 0, const char *caption = "Rect:") const {
debug(debuglevel, "%s %d, %d, %d, %d", caption, left, top, right, bottom);
}
};
} // End of namespace Common
#endif
|
