CrystalSpace

Public API Reference

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 csVector2Max () 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 csVector2Min () 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.
csBox2operator *= (const csBox2 &box)
 Compute the intersection of two bounding boxes.
csBox2operator+= (const csVector2 &point)
 Compute the union of a point with this bounding box.
csBox2operator+= (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 101 of file box.h.


Constructor & Destructor Documentation

csBox2::csBox2 (  )  [inline]

Initialize this box to empty.

Definition at line 394 of file box.h.

csBox2::csBox2 ( const csVector2 v  )  [inline]

Initialize this box with one point.

Definition at line 399 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 403 of file box.h.

csBox2::csBox2 ( const csRect r  )  [inline]

Initialize this box from the given csRect.

Definition at line 408 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 317 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 310 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 338 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 327 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 388 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 372 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 361 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 347 of file box.h.

float csBox2::Area (  )  const [inline]

Compute area of box.

Definition at line 136 of file box.h.

bool csBox2::Contains ( const csBox2 box  )  const [inline]

Test if this box contains the other box.

Definition at line 248 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 255 of file box.h.

csVector2 csBox2::GetCenter (  )  const [inline]

Get the center of this box.

Definition at line 151 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 187 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 178 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 168 of file box.h.

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

Test if the given coordinate is in this box.

Definition at line 234 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 226 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 220 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 208 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 134 of file box.h.

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

Get Max component for 0 (x) or 1 (y).

Definition at line 130 of file box.h.

float csBox2::MaxX (  )  const [inline]

Get the maximum X value of the box.

Definition at line 124 of file box.h.

float csBox2::MaxY (  )  const [inline]

Get the maximum Y value of the box.

Definition at line 126 of file box.h.

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

Get the 2d vector of minimum (x, y) values.

Definition at line 132 of file box.h.

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

Get Min component for 0 (x) or 1 (y).

Definition at line 128 of file box.h.

float csBox2::MinX (  )  const [inline]

Get the minimum X value of the box.

Definition at line 120 of file box.h.

float csBox2::MinY (  )  const [inline]

Get the minimum Y value of the box.

Definition at line 122 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 240 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 419 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 412 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 433 of file box.h.

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

Set Min component for 0 (x) or 1 (y).

Definition at line 426 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 303 of file box.h.

References csVector2::x.

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

Initialize this box to one vertex.

Definition at line 296 of file box.h.

void csBox2::StartBoundingBox (  )  [inline]

Initialize this box to empty.

Definition at line 289 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

The bottom-right coordinate of the bounding box.

Definition at line 116 of file box.h.

Referenced by Contains(), and Overlap().

The top-left coordinate of the bounding box.

Definition at line 114 of file box.h.

Referenced by Contains(), and Overlap().


The documentation for this class was generated from the following file:
Generated for Crystal Space 1.0.2 by doxygen 1.4.7