framerate< period > Class Template Reference

Display a Glut applications framerate. More...

#include <graphmisc.h>

Collaboration diagram for framerate< period >:

List of all members.

Public Member Functions
	framerate (float xpos_=0.1, float ypos_=0.05)
	xpos and ypos position the framebuffer text.
void	update ()
	Call in idle function.
void	display ()
	Call inside general display routine.
Public Attributes
float	xpos
	Position x: [0,1.0].
float	ypos
	Position y: [0,1.0].

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Detailed Description

template<int period = 500>
class framerate< period >

Display a Glut applications framerate.

Usage

Call framerate::display() from within the display function. Call framerate::update() from the idle function.

Definition at line 277 of file graphmisc.h.

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Constructor & Destructor Documentation

template<int period = 500>

framerate< period >::framerate	(	float	xpos_ = 0.1,
		float	ypos_ = 0.05
	)			[inline]

xpos and ypos position the framebuffer text.

Without scaling a 2.0 by 2.0 square with origin at center.

Definition at line 293 of file graphmisc.h.

                                               :
    frame(0), time(0), timebase(0), fps(0.0), xpos(xpos_), ypos(ypos_) {}

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Member Function Documentation

template<int period = 500>

void framerate< period >::display

(

)

[inline]

Call inside general display routine.

Keeps count off and displays the frame rate.

Definition at line 319 of file graphmisc.h.

References framerate< period >::xpos, and framerate< period >::ypos.

Referenced by helixtestscope::helixtest::display01(), and integration< D, F >::draw().

  {
    //assuming GL_MODELVIEW
    glPushMatrix(); //save
    glLoadIdentity(); //clear

    myLightingTurnOff temp2;

    glMatrixMode(GL_PROJECTION);
    glPushMatrix(); //save
    glLoadIdentity(); //clear
    //gluOrtho2D(-1.0, 1.0, -1.0, 1.0);
    gluOrtho2D(0.0, 1.0, 0.0, 1.0);
    glMatrixMode(GL_MODELVIEW);

    ++frame;

    glColor3f(0.0,1.0,0.0);

//cout << SHOW(xpos) << " " << SHOW(ypos) << endl;

    glRasterPos2f(xpos,ypos);
    //glRasterPos2f(0.8,0.2);

//cout << SHOW(sr) << endl;
    int len = sr.length();
    for (int i = 0; i < len; ++i)
      glutBitmapCharacter(GLUT_BITMAP_HELVETICA_12, sr[i]);

    glMatrixMode(GL_PROJECTION);
    glPopMatrix(); //restore
    glMatrixMode(GL_MODELVIEW);
    glPopMatrix(); //restore
  }

template<int period = 500>

void framerate< period >::update

(

)

[inline]

Call in idle function.

Definition at line 297 of file graphmisc.h.

Referenced by animate(), and helixtestscope::helixtest::idle03().

  {
    // glutGet(GLUT_ELAPSED_TIME) returns the time in millisecond units. 
    //   1unit=1ms
    time = glutGet(GLUT_ELAPSED_TIME);

    // Has a period passed? 
    if (time - timebase > period ) 
    {
      fps = frame*((GLfloat)period)/(time-timebase);
      timebase = time;    
      frame = 0;

      stringstream ss;
      ss << fps;
      sr = ss.str();
      sr += "fps";
    }
  }

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Member Data Documentation

template<int period = 500>

float framerate< period >::xpos

Position x: [0,1.0].

Definition at line 287 of file graphmisc.h.

Referenced by framerate< period >::display().

template<int period = 500>

float framerate< period >::ypos

Position y: [0,1.0].

Definition at line 289 of file graphmisc.h.

Referenced by framerate< period >::display().

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

• graphicslib/graphmisc.h