gui.cc

#include "antix.h"
using namespace Antix;

#if GRAPHICS
#include <GLUT/glut.h> // OS X users need <glut/glut.h> instead
#include "gltzpr/zpr.h" // zoom-pan-rotate GLUT utility

int Robot::winsize( 700 );

static double zoom(1.0);
// static double panx(0.0);
// static double pany(0.0);
static bool zooming(false);
//static int clickx(0), clicky(0);

// GLUT callback functions ---------------------------------------------------

// update the world - this is called whenever GLUT runs out of events
// to process
static void idle_func( void )
{
  Robot::UpdateAll();
}

static void timer_func( int dummy )
{
  glutPostRedisplay(); // force redraw
}

// draw the world - this is called whenever the window needs redrawn
static void display_func( void ) 
{  
  Robot::winsize = glutGet( GLUT_WINDOW_WIDTH );
  glClear( GL_COLOR_BUFFER_BIT );  
  Robot::DrawAll();
  glutSwapBuffers();
	
  // run this function again in about 50 msec
  glutTimerFunc( Robot::gui_interval, timer_func, 0 );
}


static void mouse_func(int button, int state, int x, int y) 
{  
  if( (button == GLUT_LEFT_BUTTON) && (state == GLUT_DOWN ) )
    {
      Robot::paused = !Robot::paused;
    }
  
  if( (button == GLUT_RIGHT_BUTTON) )
    {
      zooming = (state == GLUT_DOWN);
      //clickx = x;
      //clicky = y;
    }
}

static void motion_func( int x, int y) 
{  
  if( zooming )
    {
      static int lasty(0);		
      double scale = y > lasty ? 0.95 : 1.05;
      glScalef( scale, scale, 1 );
      lasty = y;
    }
}

// utility
void GlDrawCircle( double x, double y, double r, double count )
{
  glBegin(GL_LINE_LOOP);
  for( float a=0; a<(M_PI*2.0); a+=M_PI/count )
    glVertex2f( x + sin(a) * r, y + cos(a) * r );
  glEnd();
}


void RenderString(float x, float y, char* str )
{  
  glPushMatrix();

  glRasterPos2f(x, y);
  for( char* c = str; *c; c++ )
      glutBitmapCharacter( GLUT_BITMAP_TIMES_ROMAN_24, *c );
  
  glPopMatrix();
}

//
// Robot static member methods ---------------------------------------------

void Robot::InitGraphics( int argc, char* argv[] )
{
  zoom = 1.0 / Robot::worldsize;
  
  // initialize opengl graphics
  glutInit( &argc, argv );
  glutInitWindowSize( winsize, winsize );
  glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGBA );
  glutCreateWindow( argv[0] ); // program name
  glClearColor( 0.1,0.1,0.1,1 ); // dark grey
  glutDisplayFunc( display_func );
  glutTimerFunc( gui_interval, timer_func, 0 );
  glutMouseFunc( mouse_func );
  glutMotionFunc( motion_func );
  glutIdleFunc( idle_func );
  glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
  glEnable( GL_BLEND );
  glEnableClientState( GL_VERTEX_ARRAY );
  //  glEnableClientState( GL_COLOR_ARRAY ); // todo: code colors of pucks?
  glMatrixMode( GL_PROJECTION );
  glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
  glLoadIdentity();
  gluOrtho2D( 0,1,0,1 );
  glMatrixMode( GL_MODELVIEW );
  glLoadIdentity();
  glScalef( zoom, zoom, 1 ); 
  glPointSize( 2.0 );
  //zprInit(); // zoom & pan utilty
}

void Robot::UpdateGui()
{
  glutMainLoop();
}

// render all robots in OpenGL
void Robot::DrawAll()
{		
#if DEBUGVIS
  // draw the matrix 
  double d = worldsize / (double)(matrixwidth);

  glColor3f( 0.15,0.15,0.15 );

  glBegin( GL_LINES );
  for( unsigned int x(0); x < matrixwidth; x++ )
    {
      glVertex2f( x*d, 0 );
      glVertex2f( x*d, worldsize );
    }
  for( unsigned int y(0); y < matrixwidth; y++ )
    {
      glVertex2f( 0, y*d );
      glVertex2f( worldsize, y*d );
    }
  glEnd();
#endif
	
  // if robots are smaller than 4 pixels across, draw them as points
  if( (radius * (double)winsize/(double)worldsize) < 2.0 )
    {
      const size_t len( population.size() );
      // keep this buffer around between calls for speed
      static std::vector<GLfloat> pts;	
      static std::vector<GLfloat> colors;	
      pts.resize( len * 2 ); // fast on subsequent calls
      colors.resize( len * 3 );
			
      glVertexPointer( 2, GL_FLOAT, 0, &pts[0] );       

      glEnableClientState( GL_COLOR_ARRAY );
      glColorPointer( 3, GL_FLOAT, 0, &colors[0] );       
			
      for( unsigned int i(0); i<len; ++i )
	{
	  pts[2*i+0] = population[i]->pose.x;
	  pts[2*i+1] = population[i]->pose.y;

	  Home::Color& col = population[i]->home->color;
	  colors[3*i+0] = col.r;
	  colors[3*i+1] = col.g;
	  colors[3*i+2] = col.b;
	}
			
      glDrawArrays( GL_POINTS, 0, len );
      glDisableClientState( GL_COLOR_ARRAY );
    }
  else // more detailed drawing
    FOR_EACH( r, population )
      (*r)->Draw();
	
  FOR_EACH( it, homes )
    {
      Home* h = *it;
			
      glColor3f( h->color.r, 
		 h->color.g,
		 h->color.b );
			
      char buf[64];
      snprintf( buf, 63, "%lu", (long unsigned int) h->score );

      GlDrawCircle( h->x, h->y, h->r, 12 );
      RenderString( h->x, h->y+h->r, buf );
      
      if( h->x - h->r < 0 )
	{
	  GlDrawCircle( h->x+worldsize, h->y, h->r, 12 );
	  RenderString( h->x+worldsize, h->y+h->r, buf );
	}

      if( h->x + h->r > worldsize )
	{
	  GlDrawCircle( h->x-worldsize, h->y, h->r, 12 );
	  RenderString( h->x-worldsize, h->y+h->r, buf );
	}
      
      if( h->y - h->r < 0 )
	{
	  GlDrawCircle( h->x, h->y+worldsize, h->r, 12 );
	  RenderString( h->x, h->y+h->r+worldsize, buf );
	}
      
      if( h->y + h->r > worldsize )
	{
	  GlDrawCircle( h->x, h->y-worldsize, h->r, 12 );
	  RenderString( h->x, h->y+h->r-worldsize, buf );
	}
      
      // printf( "home %u pucks %u\n", h->id, (unsigned int)h->pucks.size() ); 
    }
	
  //glColor3f( 1,1,1 ); // green

  glPointSize( 1.0 );

	
  // pack the puck points into a vertex array for fast rendering
	
  std::vector<GLfloat> pts;		

  glColor3f( 1,0,0 ); // red
	
  FOR_EACH( c, matrix )
    FOR_EACH( p, c->pucks )
    {
      pts.push_back( (*p)->x );
      pts.push_back( (*p)->y );
	    
      if( (*p)->home )
	{
	  const float d = 0.005;
	  glRectf( (*p)->x-d, (*p)->y-d,
		   (*p)->x+d, (*p)->y+d );
	}

      // 	    if( (*p)->held )
      // 	      {
      // 		float d  = 0.002;
      // 		glColor3f( 0,1,0 ); // green
      // 		glRectf( (*p)->x-d, (*p)->y-d,
      // 			 (*p)->x+d, (*p)->y+d );
      //	      }
    } 

  glColor3f( 1,1,1 ); // white
  glVertexPointer( 2, GL_FLOAT, 0, &pts[0] );       
  glDrawArrays( GL_POINTS, 0, pts.size()/2 );	

  glPointSize( 2.0 );
}

// draw a robot
void Robot::Draw()
{
  glPushMatrix();

  // shift into this robot's local coordinate frame
  glTranslatef( pose.x, pose.y, 0 );
  glRotatef( rtod(pose.a), 0,0,1 );
  
  glColor3f( home->color.r, home->color.g, home->color.b ); 
	
  double radius = Robot::radius;
	
  // draw a circular body
  GlDrawCircle( 0,0, radius, 12 );
	
  // draw a nose indicating forward direction
  glBegin(GL_LINES);
  glVertex2f( 0, 0 );
  glVertex2f( Robot::radius, 0 );
  glEnd();

  if( Robot::show_data )
    {
      // draw a blue line to every robot I see
      glColor3f( 0,0,1 ); 
      FOR_EACH( it, see_robots )
	{
	  glBegin( GL_LINES );
	  glVertex2f( 0,0 );
	  glVertex2f( it->range * cos(it->bearing),
		      it->range * sin(it->bearing) );		      
	  glEnd();
	}
		

#if 1		
      // draw a light green line to every puck I see
      glColor3f( 0.3,0.8,0.3 ); // light green
      FOR_EACH( it, see_pucks )
	{
	  glBegin( GL_LINES );
	  glVertex2f( 0,0 );
	  glVertex2f( it->range * cos(it->bearing),
		      it->range * sin(it->bearing) );
	  glEnd();
	}
#endif
      
      glColor3f( 0.4,0.4,0.4 ); // grey
      
      // draw the sensor FOV as a pie slice
      glBegin(GL_LINE_LOOP);
      
      glVertex2f( 0, 0 );
      
      const double right( -fov/2.0 );
      const double left(  +fov/2.0 );
      const double incr(   fov/32.0 );
      
      for( double a(right); a<left; a+=incr)
	glVertex2f( cos(a) * range, 
		    sin(a) * range );
      
      glVertex2f( cos(left) * range, 
		  sin(left) * range );      
      glEnd();		
      
    }
	
  // shift out of local coordinate frame
  glPopMatrix();

  if( Robot::show_data )
    glRectf( sensor_bbox.x.min, sensor_bbox.y.min,
	     sensor_bbox.x.max, sensor_bbox.y.max );
  
#if DEBUGVIS
  
  if( first == this )
    {		
      glColor3f( 1,1,0 );
      
      double ep( Robot::range );      
      glRectf( pose.x+ep, pose.y+ep,
	       pose.x-ep, pose.y-ep );
      
      ep = Robot::radius;
      
      glColor3f( 1,0,1 );
      FOR_EACH( it, neighbors )
	glRectf( (*it)->pose.x+ep, (*it)->pose.y+ep,
		 (*it)->pose.x-ep, (*it)->pose.y-ep );
      
      glColor3f( 0,1,1 );
      FOR_EACH( it, neighbor_pucks )
	glRectf( (*it)->x+ep, (*it)->y+ep,
		 (*it)->x-ep, (*it)->y-ep );
            
      glColor3f( 0.5,0.1,0.1 );
      
      ep = worldsize / (double)matrixwidth;
  
      FOR_EACH( it, neighbor_cells )
	{
	  unsigned int index( *it );
	  unsigned int y( index / matrixwidth );
	  unsigned int x( index % matrixwidth );
	  
	  GlDrawCircle( x*ep+ep/2.0, y*ep+ep/2.0, ep/2.0, 8 );
	}		
    }
#endif
}

#endif // GRAPHICS