gobjMyCircle Class Reference

Sampled circle or ellipse. More...

#include <graphmisc.h>

Inheritance diagram for gobjMyCircle:

Collaboration diagram for gobjMyCircle:

List of all members.

Public Member Functions
	gobjMyCircle (doublec theta0, doublec theta1, doublec xaxislength, doublec yaxislength, uintc N_=360)
	General arcs can be created by changing the angle interval [theta0,theta1].
	gobjMyCircle (doublec theta0, doublec theta1, doublec radius=1.0, uintc N_=360)
	Create an arc.
	gobjMyCircle (uintc N_=360)
	Create a circle.
void	draw ()
	Dummy so that it can be placed on a gobj stack.
	~gobjMyCircle ()
	Cleanup.
Public Attributes
uintc	N
	The number of sampled points.
float *const	ptx
	The samples x values.
float *const	pty
	The samples y values.

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Detailed Description

Sampled circle or ellipse.

This can be used in drawing circles of different sizes by gobjMyCircleDraw .

Definition at line 645 of file graphmisc.h.

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Constructor & Destructor Documentation

gobjMyCircle::gobjMyCircle	(	doublec	theta0,
		doublec	theta1,
		doublec	xaxislength,
		doublec	yaxislength,
		uintc	N_ = 360
	)

General arcs can be created by changing the angle interval [theta0,theta1].

Ellipses can be made by changing the axis lengths.

Definition at line 268 of file graphmisc.cpp.

  : N(_N), ptx(new float[N]),
    pty(new float[N])
{
  //Just plot the curve 
  assert(theta1>theta0);  

  float t=theta0;
  float dt=(theta1-theta0)/(N-1);

  for (uint i=0; i<N; ++i)
  {
    ptx[i] = cos(t)*xaxislength;
    pty[i] = sin(t)*yaxislength;
    t += dt;
  }
}

gobjMyCircle::gobjMyCircle	(	doublec	theta0,
		doublec	theta1,
		doublec	radius = 1.0,
		uintc	N_ = 360
	)

Create an arc.

Definition at line 293 of file graphmisc.cpp.

  : N(_N), ptx(new float[N]),
    pty(new float[N])
{
  assert(radius>0.0);

  float t=theta0;
  float thetadiff = theta1-theta0;
  if (thetadiff<0.0)
    thetadiff += PI*2.0;
  float dt=thetadiff/(N-1);
/*
cout << SHOW(theta1-theta0) << " " << SHOW(thetadiff);
cout << " " << SHOW(dt) << endl;
*/

/*
  if (dt<0.0)
    dt += 2.0*PI;
*/

  for (uint i=0; i<N; ++i)
  {
    ptx[i] = cos(t)*radius;
    pty[i] = sin(t)*radius;
    t += dt;
  }

/*
cout << SHOW(theta1-theta0) << " " << SHOW(dt) << endl;
cout << SHOW(theta0) << " " << SHOW(theta1) << endl;
cout << SHOW(cos(theta0)) << " " << SHOW(sin(theta0)) << endl;
cout << SHOW(radius) << endl;
cout << "start: (" << ptx[0] << "," << pty[0] << ")" << endl;
cout << "end:   (" << ptx[N-1] << "," << pty[N-1] << ")" << endl;
*/

}

gobjMyCircle::gobjMyCircle

(

uintc

N_ = 360

)

Create a circle.

Definition at line 339 of file graphmisc.cpp.

  : N(_N), ptx(new float[N]),
    pty(new float[N])
{
  float t=0.0;
  float dt=2.0*PI/(N-1);

  for (uint i=0; i<N; ++i)
  {
    ptx[i] = cos(t);
    pty[i] = sin(t);
    t += dt;
  }
}

gobjMyCircle::~gobjMyCircle

(

)

Cleanup.

Definition at line 357 of file graphmisc.cpp.

References ptx, and pty.

{
  delete[] ptx; 
  delete[] pty;
}

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Member Function Documentation

void gobjMyCircle::draw

(

)

[inline, virtual]

Dummy so that it can be placed on a gobj stack.

Implements gobj.

Definition at line 683 of file graphmisc.h.

References GOBJDEBUGCODE.

{ GOBJDEBUGCODE }

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Member Data Documentation

uintc gobjMyCircle::N

The number of sampled points.

Definition at line 650 of file graphmisc.h.

Referenced by gobjMyCircleDraw::draw().

float* const gobjMyCircle::ptx

The samples x values.

Definition at line 653 of file graphmisc.h.

Referenced by gobjMyCircleDraw::draw(), and ~gobjMyCircle().

float* const gobjMyCircle::pty

The samples y values.

Definition at line 655 of file graphmisc.h.

Referenced by gobjMyCircleDraw::draw(), and ~gobjMyCircle().

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

• graphicslib/graphmisc.h
• graphicslib/graphmisc.cpp