gobjMyArrow Class Reference

Draw a primitive flat arrow in 3D space. More...

#include <graphmisc.h>

Inheritance diagram for gobjMyArrow:

Collaboration diagram for gobjMyArrow:

List of all members.

Public Member Functions

gobjMyArrow (point3< double > const &p0_, point3< double > const &p1_, doublec headlength_, doublec headwidth_, doublec delta_)

void draw ()

Draw the object.

Public Attributes

point3< double > p0

The start of the arrow.

point3< double > p1

The end of the arrow.

doublec headlength

The length of the head.

doublec headwidth

The width or height of the arrow head.

double delta

Detailed Description

Draw a primitive flat arrow in 3D space.

Definition at line 819 of file graphmisc.h.

Constructor & Destructor Documentation

gobjMyArrow::gobjMyArrow	(	point3< double > const &	p0_,
		point3< double > const &	p1_,
		doublec	headlength_,
		doublec	headwidth_,
		doublec	delta_
	)

Definition at line 212 of file graphmisc.cpp.

References delta.

00219   : p0(_p0), p1(_p1), headlength(_headlength),
00220     headwidth(_headwidth), delta(_delta)
00221 {
00222   assert(delta>=0.0);
00223   assert(delta*2.0<1.0);
00224   // The arrow head length must be <= the arrow length.
00225   double len = (p1-p0).distance();
00226   assert(headlength <= len*(1.0-2.0*delta));
00227 }

Member Function Documentation

void gobjMyArrow::draw ( ) [virtual]

Draw the object.

Implements gobj.

Definition at line 229 of file graphmisc.cpp.

References delta, point3< T >::distance(), GOBJDEBUGCODE, headlength, headwidth, p0, p1, point3< T >::x, point3< T >::y, and point3< T >::z.

00230 {
00231   GOBJDEBUGCODE
00232   point3<double> p01 = p1 - p0;
00233   double len = p01.distance();
00234 
00235   if (len==0.0)
00236     return;
00237 
00238   p01 *= 1.0/len;
00239 
00240   // p2 is the start of the arrow.
00241   point3<double> p2 = p0 + p01*delta;
00242   // p3 is the end of the arrow.
00243   point3<double> p3 = p0 + p01*(1.0-delta);
00244 
00245   point3<double> q(-p01.y,p01.x,p01.z);
00246   //q.normalize();
00247   point3<double> p4 = p3 - p01*headlength;
00248   point3<double> p5 = p4 + q*headwidth;
00249   point3<double> p6 = p4 - q*headwidth;
00250 
00251   glBegin(GL_LINES);
00252   glVertex3f(p2.x,p2.y,p2.z);
00253   glVertex3f(p3.x,p3.y,p3.z);
00254   glEnd();
00255 
00256   glBegin(GL_TRIANGLES);
00257   glVertex3f(p3.x,p3.y,p3.z);
00258   glVertex3f(p5.x,p5.y,p5.z);
00259   glVertex3f(p6.x,p6.y,p6.z);
00260   glVertex3f(p6.x,p6.y,p6.z);
00261   glVertex3f(p5.x,p5.y,p5.z);
00262   glVertex3f(p3.x,p3.y,p3.z);
00263   glEnd();
00264 }

Member Data Documentation

double gobjMyArrow::delta

Definition at line 831 of file graphmisc.h.

Referenced by draw().

doublec gobjMyArrow::headlength

The length of the head.

Definition at line 828 of file graphmisc.h.

Referenced by draw().

doublec gobjMyArrow::headwidth

The width or height of the arrow head.

Definition at line 830 of file graphmisc.h.

Referenced by draw().

point3<double> gobjMyArrow::p0

The start of the arrow.

Definition at line 824 of file graphmisc.h.

Referenced by draw().

point3<double> gobjMyArrow::p1

The end of the arrow.

Definition at line 826 of file graphmisc.h.

Referenced by draw().

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

graphicslib/graphmisc.h
graphicslib/graphmisc.cpp


Public Member Functions
	gobjMyArrow (point3< double > const &p0_, point3< double > const &p1_, doublec headlength_, doublec headwidth_, doublec delta_)
void	draw ()
	Draw the object.
Public Attributes
point3< double >	p0
	The start of the arrow.
point3< double >	p1
	The end of the arrow.
doublec	headlength
	The length of the head.
doublec	headwidth
	The width or height of the arrow head.
double	delta