buttonpanel02 Class Reference

Display a panel of 4 buttons. More...

#include <buttonpanel02.h>

Inheritance diagram for buttonpanel02:

Collaboration diagram for buttonpanel02:

List of all members.

Public Member Functions
void	update ()
	Convert the ratio values to screen coordinate variables.
point2< int >	centerpos (uintc i) const
	Get button's center position.
	buttonpanel02 (zprmouse *zm_)
	Constructor.
void	draw ()
	Draw buttons.
void	process (bool &isclicked, uint &index, point2< int > const &p)
	Test if a button was clicked.
void	drawcircle (point2< int > const &c, point3< uint > const &color) const
	Draws circle at screen coordinates.
Public Attributes
point2< double >	ratio_center
	Center as a ratio.
double	ratio_centerdelta
	Relative to x-axis.
double	ratio_radius
	Radius of button as a ratio.
point2< int >	center
	Center of button panel in screen coordinates.
int	centerdelta
	Offset from center for buttons.
double	radius
	The button's radius in pixels.
point3< uint >	color [4]
	Color corresponds with position.
zprmouse *	zm
	Conversion programs.

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Detailed Description

Display a panel of 4 buttons.

In 2D screen coordinate space.

The buttons are defined in an order where 0 is top, right is 1, down is 2, left is 3.

Definition at line 16 of file buttonpanel02.h.

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Constructor & Destructor Documentation

buttonpanel02::buttonpanel02

(

zprmouse *

zm_

)

Constructor.

Definition at line 4 of file buttonpanel02.cpp.

References color, ratio_center, ratio_centerdelta, ratio_radius, and update().

  : zm(zm_)
{
  ratio_center = point2<double>(0.9,0.8);
  ratio_centerdelta = 0.012;
  ratio_radius = 0.008;

/*
  color[0] = point3<uint>(239,151,255);
  color[1] = point3<uint>(127,255,0);
  color[2] = point3<uint>(240,192,10);
  color[3] = point3<uint>(239,254,240);
*/
  color[0] = point3<uint>(255,0,0);
  color[1] = point3<uint>(0,255,0);
  color[2] = point3<uint>(0,0,255);
  color[3] = point3<uint>(127,127,127);

  update();
}

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Member Function Documentation

point2< int > buttonpanel02::centerpos

(

uintc

i

)

const

Get button's center position.

Definition at line 158 of file buttonpanel02.cpp.

References center, centerdelta, point2< T >::x, and point2< T >::y.

Referenced by draw().

{
  assert(i<4);

  if (i==0)
    return point2<int>(center.x,center.y-centerdelta);
  if (i==1)
    return point2<int>(center.x+centerdelta,center.y);
  if (i==2)
    return point2<int>(center.x,center.y+centerdelta);

  return point2<int>(center.x-centerdelta,center.y);
}

void buttonpanel02::draw

(

)

[virtual]

Draw buttons.

Implements gobj.

Definition at line 118 of file buttonpanel02.cpp.

References centerpos(), drawcircle(), zpr::height, zpr::width, zm, and zprmouse::zz.

{
  assert(zm);

  // Code taken from tutorial
  //   http://basic4gl.wikispaces.com/2D+Drawing+in+OpenGL

  glMatrixMode(GL_PROJECTION);
  glPushMatrix();
  glLoadIdentity();
  glOrtho(0,zm->zz.width,zm->zz.height,0,0,1);
  glDisable(GL_DEPTH_TEST);
  glMatrixMode(GL_MODELVIEW);
  glPushMatrix();
  glLoadIdentity();
  glTranslatef(0.375,0.375,0);

/*
  radius=5;
  int x1=320;
  int y1=240;

  drawcircle(x1,y1,point3<uint>(255,0,0)); 
*/

  drawcircle(centerpos(0),color[0]);
  drawcircle(centerpos(1),color[1]);
  drawcircle(centerpos(2),color[2]);
  drawcircle(centerpos(3),color[3]);

  // Returning to previous state.
  glPopMatrix();
  glMatrixMode(GL_PROJECTION);
  glPopMatrix();
  glMatrixMode(GL_MODELVIEW);

  glEnable(GL_DEPTH_TEST);
} 

void buttonpanel02::drawcircle	(	point2< int > const &	c,
		point3< uint > const &	color
	)			const

Draws circle at screen coordinates.

Definition at line 87 of file buttonpanel02.cpp.

References point3< T >::x, point2< T >::x, point3< T >::y, point2< T >::y, and point3< T >::z.

Referenced by draw().

{
  int x1=c.x;
  int y1=c.y;

  glPushAttrib(GL_CURRENT_BIT);
  glPushAttrib(GL_LIGHTING_BIT);
  glDisable(GL_LIGHTING);
  glColor3ub(color.x,color.y,color.z);

  doublec rad=3.141592*2.0/360.0;

  glBegin(GL_TRIANGLE_FAN);
  glVertex2f(x1,y1);
  for (double angle=0; angle<=360; angle+=2)
  {
    point2<double> x2(x1+ sin(rad*angle)*radius, y1 + cos(rad*angle)*radius);
//    cout << SHOW(x2) << " ";
    glVertex2d(x2.x,x2.y);
  }
  glEnd();

//cout << endl;

  glPopAttrib();
  glPopAttrib();
}

void buttonpanel02::process	(	bool &	isclicked,
		uint &	index,
		point2< int > const &	p
	)

Test if a button was clicked.

Definition at line 42 of file buttonpanel02.cpp.

References point2< T >::x, and point2< T >::y.

{
  assert(centerdelta>0);
  assert(radius>0);

  isclicked=false;

  assert(zm);
  // Pushing the button triggers two calls, one
  //   down and the other up.  This rejects up.
  if (zm->zz.mouseLeft==false)
    return;


  // Bounding box rejects most cases. 
  if (p.x < (center.x - centerdelta - radius))
    return;
  if (p.x > (center.x + centerdelta + radius))
    return;
  if (p.y < (center.y - centerdelta - radius))
    return;
  if (p.y > (center.y + centerdelta + radius))
    return;

  point2<double> current(p.x,p.y);
  double radius2 = radius*radius;

  for (uint i=0; i<4; ++i)
  {
    point2<double> b0(centerpos(i).x,centerpos(i).y);
    if ((b0-current).dot() < radius2)
    {
      isclicked=true;
      index=i;
      return;
    }
  }

}

void buttonpanel02::update

(

)

Convert the ratio values to screen coordinate variables.

eg ratio_radius set the radius variable.

Definition at line 25 of file buttonpanel02.cpp.

References center, centerdelta, zpr::height, radius, ratio_center, ratio_centerdelta, ratio_radius, zpr::width, point2< T >::x, point2< T >::y, zm, and zprmouse::zz.

Referenced by buttonpanel02(), and maze004::reshape01().

{
  assert(zm);
  if (zm==0)
    return;

  center.x = zm->zz.width * ratio_center.x; 
  center.y = zm->zz.height * ratio_center.y; 

  centerdelta = zm->zz.width * ratio_centerdelta;

  radius = zm->zz.width * ratio_radius;

}

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Member Data Documentation

point2<int> buttonpanel02::center

Center of button panel in screen coordinates.

Definition at line 35 of file buttonpanel02.h.

Referenced by centerpos(), and update().

int buttonpanel02::centerdelta

Offset from center for buttons.

Definition at line 38 of file buttonpanel02.h.

Referenced by centerpos(), and update().

point3<uint> buttonpanel02::color[4]

Color corresponds with position.

Definition at line 44 of file buttonpanel02.h.

Referenced by buttonpanel02().

double buttonpanel02::radius

The button's radius in pixels.

Definition at line 41 of file buttonpanel02.h.

Referenced by update().

point2<double> buttonpanel02::ratio_center

Center as a ratio.

Definition at line 21 of file buttonpanel02.h.

Referenced by buttonpanel02(), and update().

double buttonpanel02::ratio_centerdelta

Relative to x-axis.

Definition at line 24 of file buttonpanel02.h.

Referenced by buttonpanel02(), and update().

double buttonpanel02::ratio_radius

Radius of button as a ratio.

Definition at line 27 of file buttonpanel02.h.

Referenced by buttonpanel02(), and update().

zprmouse* buttonpanel02::zm

Conversion programs.

Definition at line 53 of file buttonpanel02.h.

Referenced by draw(), and update().

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

• maze/buttonpanel02.h
• maze/buttonpanel02.cpp