mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-27 12:16:59 +00:00
272 lines
7.4 KiB
C++
272 lines
7.4 KiB
C++
/* ScummVM - Graphic Adventure Engine
|
|
*
|
|
* ScummVM is the legal property of its developers, whose names
|
|
* are too numerous to list here. Please refer to the COPYRIGHT
|
|
* file distributed with this source distribution.
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#ifndef COMMON_RECT_H
|
|
#define COMMON_RECT_H
|
|
|
|
#include "common/scummsys.h"
|
|
#include "common/util.h"
|
|
#include "common/debug.h"
|
|
|
|
namespace Common {
|
|
|
|
/**
|
|
* Simple class for handling both 2D position and size.
|
|
*/
|
|
struct Point {
|
|
int16 x; ///< The horizontal part of the point
|
|
int16 y; ///< The vertical part of the point
|
|
|
|
Point() : x(0), y(0) {}
|
|
Point(int16 x1, int16 y1) : x(x1), y(y1) {}
|
|
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; }
|
|
Point operator+(const Point &delta) const { return Point(x + delta.x, y + delta.y); }
|
|
Point operator-(const Point &delta) const { return Point(x - delta.x, y - delta.y); }
|
|
|
|
void operator+=(const Point &delta) {
|
|
x += delta.x;
|
|
y += delta.y;
|
|
}
|
|
|
|
void operator-=(const Point &delta) {
|
|
x -= delta.x;
|
|
y -= delta.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 uint(diffx * diffx + diffy * diffy);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Simple class for handling a rectangular zone.
|
|
*
|
|
* 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.
|
|
*
|
|
* Conceptually, 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());
|
|
}
|
|
bool operator==(const Rect &rhs) const { return equals(rhs); }
|
|
bool operator!=(const Rect &rhs) const { return !equals(rhs); }
|
|
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
/**
|
|
* Check if the given rect is contained inside this rectangle.
|
|
*
|
|
* @param r The rectangle to check
|
|
*
|
|
* @return true if the given rect is inside, false otherwise
|
|
*/
|
|
bool contains(const Rect &r) const {
|
|
return (left <= r.left) && (r.right <= right) && (top <= r.top) && (r.bottom <= bottom);
|
|
}
|
|
|
|
/**
|
|
* Check if the given rect is equal to this one.
|
|
*
|
|
* @param r The rectangle to check
|
|
*
|
|
* @return true if the given rect is equal, false otherwise
|
|
*/
|
|
bool equals(const Rect &r) const {
|
|
return (left == r.left) && (right == r.right) && (top == r.top) && (bottom == r.bottom);
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
/**
|
|
* Find the intersecting rectangle between this rectangle and the given rectangle
|
|
*
|
|
* @param r the intersecting rectangle
|
|
*
|
|
* @return the intersection of the rectangles or an empty rectangle if not intersecting
|
|
*/
|
|
Rect findIntersectingRect(const Rect &r) const {
|
|
if (!intersects(r))
|
|
return Rect();
|
|
|
|
return Rect(MAX(r.left, left), MAX(r.top, top), MIN(r.right, right), MIN(r.bottom, bottom));
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
/**
|
|
* 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(int16 maxw, int16 maxh) {
|
|
clip(Rect(0, 0, maxw, maxh));
|
|
}
|
|
|
|
bool isEmpty() const {
|
|
return (left >= right || top >= bottom);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* Create a rectangle around the given center.
|
|
* @note the center point is rounded up and left when given an odd width and height
|
|
*/
|
|
static Rect center(int16 cx, int16 cy, int16 w, int16 h) {
|
|
int x = cx - w / 2, y = cy - h / 2;
|
|
return Rect(x, y, x + w, y + h);
|
|
}
|
|
};
|
|
|
|
} // End of namespace Common
|
|
|
|
#endif
|