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Line Class Reference

#include <GeometricalObjects.h>

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Public Member Functions

 Line ()
 Line (const Vector2D &sp, const Vector2D &d, const double len, const double th)
 Line (const Vector2D &sp, const Vector2D &d, const double len, const double th, const double b_c, const double hardn)
virtual ~Line ()
double get_distance (const Vector2D &pos, const Vector2D &vel, const double size)
bool within_distance (const Vector2D &pos, const double size)
Vector2D get_normal (const Vector2D &pos)
void draw_shape (bool erase)
Vector2D get_start_point ()
Vector2D get_direction ()
double get_length ()
double get_thickness ()

Protected Attributes

Vector2D start_point
Vector2D direction
double length
double thickness
Vector2D last_drawn_start_point
Vector2D last_drawn_direction
double last_drawn_length
double last_drawn_thickness

Constructor & Destructor Documentation

Line::Line (   ) 
 

Definition at line 35 of file GeometricalObjects.cc.

References direction, infinity, last_drawn_direction, last_drawn_length, last_drawn_start_point, last_drawn_thickness, length, start_point, and thickness.

00036 {
00037   start_point = Vector2D(0.0, 0.0);
00038   direction = Vector2D(0.0, 0.0);
00039   length = 0.0;
00040   thickness = 0.0;
00041   last_drawn_start_point = Vector2D(-infinity,-infinity);
00042   last_drawn_direction = Vector2D(-infinity,-infinity);
00043   last_drawn_length = 0.0;
00044   last_drawn_thickness = 0.0;
00045 }

Line::Line (  const Vector2D &  sp,
const Vector2D &  d,
const double  len,
const double  th
) 
 

Definition at line 47 of file GeometricalObjects.cc.

References direction, last_drawn_direction, last_drawn_length, last_drawn_start_point, last_drawn_thickness, length, start_point, and thickness.

00048 {
00049   last_drawn_start_point = start_point = sp;
00050   last_drawn_direction = direction = d;
00051   last_drawn_length = length = len;
00052   last_drawn_thickness = thickness = th;
00053 }

Line::Line (  const Vector2D &  sp,
const Vector2D &  d,
const double  len,
const double  th,
const double  b_c,
const double  hardn
) 
 

virtual Line::~Line (   )  [inline, virtual]
 

Definition at line 35 of file GeometricalObjects.h.

00035 {}

Member Function Documentation

void Line::draw_shape (  bool  erase  )  [virtual]
 

Implements Shape.

Definition at line 115 of file GeometricalObjects.cc.

References direction, ArenaWindow::draw_line(), Gui::get_arenawindow_p(), Gui::get_bg_gdk_colour_p(), last_drawn_direction, last_drawn_length, last_drawn_start_point, last_drawn_thickness, length, start_point, the_gui, and thickness.

00116 {
00117   if( erase )
00118     the_gui.get_arenawindow_p()->draw_line( last_drawn_start_point,
00119                                             last_drawn_direction,
00120                                             last_drawn_length,
00121                                             last_drawn_thickness,
00122                                             *(the_gui.get_bg_gdk_colour_p()) );
00123   last_drawn_start_point = start_point;
00124   last_drawn_direction = direction;
00125   last_drawn_length = length;
00126   last_drawn_thickness = thickness;
00127   the_gui.get_arenawindow_p()->draw_line( start_point, direction,
00128                                           length, thickness,
00129                                           gdk_colour );
00130 }

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Vector2D Line::get_direction (   )  [inline]
 

Definition at line 46 of file GeometricalObjects.h.

00046 { return direction; }

double Line::get_distance (  const Vector2D &  pos,
const Vector2D &  vel,
const double  size
)  [inline, virtual]
 

Implements Shape.

Definition at line 67 of file GeometricalObjects.cc.

References direction, dot(), max, start_point, and vedge().

00068 {
00069   double det, s, t, d, t_middle;
00070 
00071   Vector2D y = start_point - pos;
00072 
00073   det = 1.0 / vedge(direction, vel);  
00074   t_middle = vedge(direction, y) * det;
00075 
00076   if( t_middle < 0 ) return infinity;
00077 
00078   d = size + thickness;
00079   if( det > 0 )
00080     {
00081       t = (vedge(direction, y) - d) * det;
00082       s = (vedge(vel,y) - d * dot(vel, direction)) * det;
00083     }
00084   else
00085     {
00086       t = (vedge(direction, y) + d) * det;
00087       s = (vedge(vel,y) + d * dot(vel, direction)) * det;
00088     }
00089   if( s < 0 || s > length ) return infinity;
00090   if( t < 0 && ((d=-dot(y, direction)) < 0.0 || d > length ) ) return infinity;
00091 
00092   return max(t, 0);
00093 }

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double Line::get_length (   )  [inline]
 

Definition at line 47 of file GeometricalObjects.h.

00047 { return length; }

Vector2D Line::get_normal (  const Vector2D &  pos  )  [virtual]
 

Implements Shape.

Definition at line 96 of file GeometricalObjects.cc.

References direction, rotate90(), start_point, and vedge().

00097 {
00098   if( vedge( direction , pos-start_point ) > 0.0 )
00099     return rotate90(direction);
00100   else
00101     return -rotate90(direction);
00102 }

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Vector2D Line::get_start_point (   )  [inline]
 

Definition at line 45 of file GeometricalObjects.h.

00045 { return start_point; }

double Line::get_thickness (   )  [inline]
 

Definition at line 48 of file GeometricalObjects.h.

00048 { return thickness; }

bool Line::within_distance (  const Vector2D &  pos,
const double  size
)  [virtual]
 

Implements Shape.

Definition at line 105 of file GeometricalObjects.cc.

References direction, dot(), start_point, and vedge().

00106 {
00107   Vector2D y = start_point - pos;
00108   
00109   return ((fabs(vedge(y, direction)) <= (size+thickness)) &&
00110           (-dot(y,direction) >= 0 && -dot(y,direction) <= length));
00111 }

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Field Documentation

Vector2D Line::direction [protected]
 

Definition at line 52 of file GeometricalObjects.h.

Referenced by draw_shape(), get_distance(), get_normal(), Line(), and within_distance().

Vector2D Line::last_drawn_direction [protected]
 

Definition at line 57 of file GeometricalObjects.h.

Referenced by draw_shape(), and Line().

double Line::last_drawn_length [protected]
 

Definition at line 58 of file GeometricalObjects.h.

Referenced by draw_shape(), and Line().

Vector2D Line::last_drawn_start_point [protected]
 

Definition at line 56 of file GeometricalObjects.h.

Referenced by draw_shape(), and Line().

double Line::last_drawn_thickness [protected]
 

Definition at line 59 of file GeometricalObjects.h.

Referenced by draw_shape(), and Line().

double Line::length [protected]
 

Definition at line 53 of file GeometricalObjects.h.

Referenced by draw_shape(), and Line().

Vector2D Line::start_point [protected]
 

Definition at line 51 of file GeometricalObjects.h.

Referenced by draw_shape(), get_distance(), get_normal(), Line(), and within_distance().

double Line::thickness [protected]
 

Definition at line 54 of file GeometricalObjects.h.

Referenced by draw_shape(), and Line().

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