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# csBox2 Class Reference
[Geometry utilities]

A bounding box in 2D space. More...

`#include <csgeom/box.h>`

List of all members.

## Public Member Functions

void | AddBoundingVertex (const csVector2 &v)
| Add a new vertex and recalculate the bounding box.
void | AddBoundingVertex (float x, float y)
| Add a new vertex and recalculate the bounding box.
void | AddBoundingVertexSmart (const csVector2 &v)
| Add a new vertex and recalculate the bounding box.
void | AddBoundingVertexSmart (float x, float y)
| Add a new vertex and recalculate the bounding box.
bool | AddBoundingVertexSmartTest (const csVector2 &v)
| Add a new vertex and recalculate the bounding box.
bool | AddBoundingVertexSmartTest (float x, float y)
| Add a new vertex and recalculate the bounding box.
bool | AddBoundingVertexTest (const csVector2 &v)
| Add a new vertex and recalculate the bounding box.
bool | AddBoundingVertexTest (float x, float y)
| Add a new vertex and recalculate the bounding box.
float | Area () const
| Compute area of box.
bool | Contains (const csBox2 &box) const
| Test if this box contains the other box.
| csBox2 (const csRect &r)
| Initialize this box from the given csRect.
| csBox2 (float x1, float y1, float x2, float y2)
| Initialize this box with the given values.
| csBox2 (const csVector2 &v)
| Initialize this box with one point.
| csBox2 ()
| Initialize this box to empty.
csString | Description () const
| Return a textual representation of the box in the form "(minx,miny)-(maxx,maxy)".
bool | Empty () const
| Test if this box is empty.
csVector2 | GetCenter () const
| Get the center of this box.
csVector2 | GetCorner (int corner) const
| Return every corner of this bounding box from 0 to 3.
void | GetEdge (int edge, csSegment2 &e) const
| Return every edge (segment) of this bounding box from 0 to 7 (CS_BOX_EDGE_xy_Xy etc.
csSegment2 | GetEdge (int edge) const
| Return every edge (segment) of this bounding box from 0 to 7 (CS_BOX_EDGE_xy_Xy etc.
void | GetEdgeInfo (int edge, int &v1, int &v2) const
| Given an edge index (CS_BOX_EDGE_xy_Xy etc.
bool | In (const csVector2 &v) const
| Test if the given coordinate is in this box.
bool | In (float x, float y) const
| Test if the given coordinate is in this box.
bool | Intersect (csVector2 *poly, int num_poly) const
| Test if a polygon if visible in the box.
const csVector2 & | Max () const
| Get the 2d vector of maximum (x, y) values.
float | Max (int idx) const
| Get Max component for 0 (x) or 1 (y).
float | MaxX () const
| Get the maximum X value of the box.
float | MaxY () const
| Get the maximum Y value of the box.
const csVector2 & | Min () const
| Get the 2d vector of minimum (x, y) values.
float | Min (int idx) const
| Get Min component for 0 (x) or 1 (y).
float | MinX () const
| Get the minimum X value of the box.
float | MinY () const
| Get the minimum Y value of the box.
csBox2 & | operator *= (const csBox2 &box)
| Compute the intersection of two bounding boxes.
csBox2 & | operator+= (const csVector2 &point)
| Compute the union of a point with this bounding box.
csBox2 & | operator+= (const csBox2 &box)
| Compute the union of two bounding boxes.
bool | Overlap (const csBox2 &box) const
| Test if this box overlaps with the given box.
void | Set (float x1, float y1, float x2, float y2)
| Sets the bounds of the box with the given values.
void | Set (const csVector2 &bmin, const csVector2 &bmax)
| Sets the bounds of the box with the given values.
void | SetCenter (const csVector2 &c)
| Set the center of this box.
void | SetMax (int idx, float val)
| Set Max component for 0 (x) or 1 (y).
void | SetMin (int idx, float val)
| Set Min component for 0 (x) or 1 (y).
void | SetSize (const csVector2 &s)
| Set the size of the box but keep the center intact.
float | SquaredOriginDist () const
| Calculate the squared distance between (0,0) and the box This routine is extremely efficient.
float | SquaredOriginMaxDist () const
| Calculate the squared distance between (0,0) and the point on the box which is furthest away from (0,0).
float | SquaredPosDist (const csVector2 &pos) const
| Calculate the squared distance between pos and the box This routine is extremely efficient.
float | SquaredPosMaxDist (const csVector2 &pos) const
| Calculate the squared distance between pos and the point on the box which is furthest away from pos.
void | StartBoundingBox (float x, float y)
| Same but given some coordinates.
void | StartBoundingBox (const csVector2 &v)
| Initialize this box to one vertex.
void | StartBoundingBox ()
| Initialize this box to empty.
bool | TestIntersect (const csBox2 &box) const
| Test if the two boxes have an intersection.

## Static Public Member Functions

static bool | Intersect (const csVector2 &minbox, const csVector2 &maxbox, csVector2 *poly, int num_poly)
| Test if a polygon if visible in the box.
static bool | Intersect (float minx, float miny, float maxx, float maxy, csVector2 *poly, int num_poly)
| Test if a polygon if visible in the box.

## Protected Attributes

csVector2 | maxbox
| The bottom-right coordinate of the bounding box.
csVector2 | minbox
| The top-left coordinate of the bounding box.

## Friends

csBox2 | operator * (const csBox2 &box1, const csBox2 &box2)
| Compute the intersection of two bounding boxes.
bool | operator!= (const csBox2 &box1, const csBox2 &box2)
| Tests if two bounding boxes are unequal.
csBox2 | operator+ (const csBox2 &box, const csVector2 &point)
| Compute the union of a bounding box and a point.
csBox2 | operator+ (const csBox2 &box1, const csBox2 &box2)
| Compute the union of two bounding boxes.
bool | operator< (const csVector2 &point, const csBox2 &box)
| Tests if a point is contained in a box.
bool | operator< (const csBox2 &box1, const csBox2 &box2)
| Tests if box1 is a subset of box2.
bool | operator== (const csBox2 &box1, const csBox2 &box2)
| Tests if two bounding boxes are equal.
bool | operator> (const csBox2 &box1, const csBox2 &box2)
| Tests if box1 is a superset of box2.

## Detailed Description

A bounding box in 2D space.

In order to operate correctly, this bounding box assumes that all values entered or compared against lie within the range (-CS_BOUNDINGBOX_MAXVALUE, CS_BOUNDINGBOX_MAXVALUE). It is not recommended to use points outside of this range.

Definition at line 100 of file box.h.

## Constructor & Destructor Documentation

csBox2::csBox2 | ( |  | ) | `[inline]`

| Initialize this box to empty. Definition at line 393 of file box.h.

csBox2::csBox2 | ( | const csVector2 & | v | ) | `[inline]`

| Initialize this box with one point. Definition at line 398 of file box.h.

csBox2::csBox2 | ( | float | x1,
|  | float | y1,
|  | float | x2,
|  | float | y2
| ) | `[inline]`

| Initialize this box with the given values. Definition at line 402 of file box.h.

csBox2::csBox2 | ( | const csRect & | r | ) | `[inline]`

| Initialize this box from the given csRect. Definition at line 407 of file box.h.

## Member Function Documentation

void csBox2::AddBoundingVertex | ( | const csVector2 & | v | ) | `[inline]`

| Add a new vertex and recalculate the bounding box. Definition at line 316 of file box.h. References csVector2::x, and csVector2::y.

void csBox2::AddBoundingVertex | ( | float | x,
|  | float | y
| ) | `[inline]`

| Add a new vertex and recalculate the bounding box. Definition at line 309 of file box.h.

void csBox2::AddBoundingVertexSmart | ( | const csVector2 & | v | ) | `[inline]`

| Add a new vertex and recalculate the bounding box. This version is a little more optimal. It assumes however that at least one point has been added to the bounding box. Definition at line 337 of file box.h. References csVector2::x, and csVector2::y.

void csBox2::AddBoundingVertexSmart | ( | float | x,
|  | float | y
| ) | `[inline]`

| Add a new vertex and recalculate the bounding box. This version is a little more optimal. It assumes however that at least one point has been added to the bounding box. Definition at line 326 of file box.h.

bool csBox2::AddBoundingVertexSmartTest | ( | const csVector2 & | v | ) | `[inline]`

| Add a new vertex and recalculate the bounding box. This version is a little more optimal. It assumes however that at least one point has been added to the bounding box. Return true if the box was modified. Definition at line 387 of file box.h. References csVector2::x, and csVector2::y.

bool csBox2::AddBoundingVertexSmartTest | ( | float | x,
|  | float | y
| ) | `[inline]`

| Add a new vertex and recalculate the bounding box. This version is a little more optimal. It assumes however that at least one point has been added to the bounding box. Return true if the box was modified. Definition at line 371 of file box.h.

bool csBox2::AddBoundingVertexTest | ( | const csVector2 & | v | ) | `[inline]`

| Add a new vertex and recalculate the bounding box. Return true if the box was modified. Definition at line 360 of file box.h. References csVector2::x, and csVector2::y.

bool csBox2::AddBoundingVertexTest | ( | float | x,
|  | float | y
| ) | `[inline]`

| Add a new vertex and recalculate the bounding box. Return true if the box was modified. Definition at line 346 of file box.h.

float csBox2::Area | ( |  | ) | const`[inline]`

| Compute area of box. Definition at line 135 of file box.h.

bool csBox2::Contains | ( | const csBox2 & | box | ) | const`[inline]`

| Test if this box contains the other box. Definition at line 247 of file box.h. References maxbox, minbox, csVector2::x, and csVector2::y.

csString csBox2::Description | ( |  | ) | const

| Return a textual representation of the box in the form "(minx,miny)-(maxx,maxy)".

bool csBox2::Empty | ( |  | ) | const`[inline]`

| Test if this box is empty. Definition at line 254 of file box.h.

csVector2 csBox2::GetCenter | ( |  | ) | const`[inline]`

| Get the center of this box. Definition at line 150 of file box.h.

csVector2 csBox2::GetCorner | ( | int | corner | ) | const

| Return every corner of this bounding box from 0 to 3. This contrasts with Min() and Max() because those are only the min and max corners. Corner 0 = xy, 1 = xY, 2 = Xy, 3 = XY. Use CS_BOX_CORNER_xy etc. defines. CS_BOX_CENTER2 also works.

void csBox2::GetEdge | ( | int | edge,
|  | csSegment2 & | e
| ) | const`[inline]`

| Return every edge (segment) of this bounding box from 0 to 7 (CS_BOX_EDGE_xy_Xy etc. ). Definition at line 186 of file box.h. References csSegment2::SetEnd(), and csSegment2::SetStart().

csSegment2 csBox2::GetEdge | ( | int | edge | ) | const`[inline]`

| Return every edge (segment) of this bounding box from 0 to 7 (CS_BOX_EDGE_xy_Xy etc. ). Definition at line 177 of file box.h.

void csBox2::GetEdgeInfo | ( | int | edge,
|  | int & | v1,
|  | int & | v2
| ) | const`[inline]`

| Given an edge index (CS_BOX_EDGE_xy_Xy etc. ) return the two vertices (index CS_BOX_CORNER_xy etc.). Definition at line 167 of file box.h.

bool csBox2::In | ( | const csVector2 & | v | ) | const`[inline]`

| Test if the given coordinate is in this box. Definition at line 233 of file box.h. References csVector2::x, and csVector2::y.

bool csBox2::In | ( | float | x,
|  | float | y
| ) | const`[inline]`

| Test if the given coordinate is in this box. Definition at line 225 of file box.h.

bool csBox2::Intersect | ( | csVector2 * | poly,
|  | int | num_poly
| ) | const`[inline]`

| Test if a polygon if visible in the box. This function does not test the case where the box is fully contained in the polygon. But all other cases are tested. Definition at line 219 of file box.h.

static bool csBox2::Intersect | ( | const csVector2 & | minbox,
|  | const csVector2 & | maxbox,
|  | csVector2 * | poly,
|  | int | num_poly
| ) | `[inline, static]`

| Test if a polygon if visible in the box. This function does not test the case where the box is fully contained in the polygon. But all other cases are tested. Definition at line 207 of file box.h. References csVector2::x, and csVector2::y.

static bool csBox2::Intersect | ( | float | minx,
|  | float | miny,
|  | float | maxx,
|  | float | maxy,
|  | csVector2 * | poly,
|  | int | num_poly
| ) | `[static]`

| Test if a polygon if visible in the box. This function does not test the case where the box is fully contained in the polygon. But all other cases are tested.

const csVector2& csBox2::Max | ( |  | ) | const`[inline]`

| Get the 2d vector of maximum (x, y) values. Definition at line 133 of file box.h.

float csBox2::Max | ( | int | idx | ) | const`[inline]`

| Get Max component for 0 (x) or 1 (y). Definition at line 129 of file box.h.

float csBox2::MaxX | ( |  | ) | const`[inline]`

| Get the maximum X value of the box. Definition at line 123 of file box.h.

float csBox2::MaxY | ( |  | ) | const`[inline]`

| Get the maximum Y value of the box. Definition at line 125 of file box.h.

const csVector2& csBox2::Min | ( |  | ) | const`[inline]`

| Get the 2d vector of minimum (x, y) values. Definition at line 131 of file box.h.

float csBox2::Min | ( | int | idx | ) | const`[inline]`

| Get Min component for 0 (x) or 1 (y). Definition at line 127 of file box.h.

float csBox2::MinX | ( |  | ) | const`[inline]`

| Get the minimum X value of the box. Definition at line 119 of file box.h.

float csBox2::MinY | ( |  | ) | const`[inline]`

| Get the minimum Y value of the box. Definition at line 121 of file box.h.

csBox2& csBox2::operator *= | ( | const csBox2 & | box | ) |

| Compute the intersection of two bounding boxes.

csBox2& csBox2::operator+= | ( | const csVector2 & | point | ) |

| Compute the union of a point with this bounding box.

csBox2& csBox2::operator+= | ( | const csBox2 & | box | ) |

| Compute the union of two bounding boxes.

bool csBox2::Overlap | ( | const csBox2 & | box | ) | const`[inline]`

| Test if this box overlaps with the given box. Definition at line 239 of file box.h. References maxbox, minbox, csVector2::x, and csVector2::y.

void csBox2::Set | ( | float | x1,
|  | float | y1,
|  | float | x2,
|  | float | y2
| ) | `[inline]`

| Sets the bounds of the box with the given values. Definition at line 418 of file box.h.

void csBox2::Set | ( | const csVector2 & | bmin,
|  | const csVector2 & | bmax
| ) | `[inline]`

| Sets the bounds of the box with the given values. Definition at line 411 of file box.h.

void csBox2::SetCenter | ( | const csVector2 & | c | ) |

| Set the center of this box. This will not change the size of the box but just relocate the center.

void csBox2::SetMax | ( | int | idx,
|  | float | val
| ) | `[inline]`

| Set Max component for 0 (x) or 1 (y). Definition at line 432 of file box.h.

void csBox2::SetMin | ( | int | idx,
|  | float | val
| ) | `[inline]`

| Set Min component for 0 (x) or 1 (y). Definition at line 425 of file box.h.

void csBox2::SetSize | ( | const csVector2 & | s | ) |

| Set the size of the box but keep the center intact.

float csBox2::SquaredOriginDist | ( |  | ) | const

| Calculate the squared distance between (0,0) and the box This routine is extremely efficient.

float csBox2::SquaredOriginMaxDist | ( |  | ) | const

| Calculate the squared distance between (0,0) and the point on the box which is furthest away from (0,0). This routine is extremely efficient.

float csBox2::SquaredPosDist | ( | const csVector2 & | pos | ) | const

| Calculate the squared distance between pos and the box This routine is extremely efficient.

float csBox2::SquaredPosMaxDist | ( | const csVector2 & | pos | ) | const

| Calculate the squared distance between pos and the point on the box which is furthest away from pos. This routine is extremely efficient.

void csBox2::StartBoundingBox | ( | float | x,
|  | float | y
| ) | `[inline]`

| Same but given some coordinates. Definition at line 302 of file box.h. References csVector2::x.

void csBox2::StartBoundingBox | ( | const csVector2 & | v | ) | `[inline]`

| Initialize this box to one vertex. Definition at line 295 of file box.h.

void csBox2::StartBoundingBox | ( |  | ) | `[inline]`

| Initialize this box to empty. Definition at line 288 of file box.h. References CS_BOUNDINGBOX_MAXVALUE.

bool csBox2::TestIntersect | ( | const csBox2 & | box | ) | const

| Test if the two boxes have an intersection.

## Friends And Related Function Documentation

csBox2 operator * | ( | const csBox2 & | box1,
|  | const csBox2 & | box2
| ) | `[friend]`

| Compute the intersection of two bounding boxes.

bool operator!= | ( | const csBox2 & | box1,
|  | const csBox2 & | box2
| ) | `[friend]`

| Tests if two bounding boxes are unequal.

csBox2 operator+ | ( | const csBox2 & | box,
|  | const csVector2 & | point
| ) | `[friend]`

| Compute the union of a bounding box and a point.

csBox2 operator+ | ( | const csBox2 & | box1,
|  | const csBox2 & | box2
| ) | `[friend]`

| Compute the union of two bounding boxes.

bool operator< | ( | const csVector2 & | point,
|  | const csBox2 & | box
| ) | `[friend]`

| Tests if a point is contained in a box.

bool operator< | ( | const csBox2 & | box1,
|  | const csBox2 & | box2
| ) | `[friend]`

| Tests if box1 is a subset of box2.

bool operator== | ( | const csBox2 & | box1,
|  | const csBox2 & | box2
| ) | `[friend]`

| Tests if two bounding boxes are equal.

bool operator> | ( | const csBox2 & | box1,
|  | const csBox2 & | box2
| ) | `[friend]`

| Tests if box1 is a superset of box2.

## Member Data Documentation

csVector2 csBox2::maxbox `[protected]`

| The bottom-right coordinate of the bounding box. Definition at line 115 of file box.h. Referenced by Contains(), and Overlap().

csVector2 csBox2::minbox `[protected]`

| The top-left coordinate of the bounding box. Definition at line 113 of file box.h. Referenced by Contains(), and Overlap().

The documentation for this class was generated from the following file:

- csgeom/box.h