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boid.cpp
142 lines (110 loc) · 2.89 KB
/
boid.cpp
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#include "boid.hpp"
#include <math.h>
#include <QBrush>
#include <QPolygonF>
#include <QPainter>
#include <QPolygonF>
#include <QDebug>
#define PI 3.14159265
#define NUM_TRAIL_POINTS 250
Boid::Boid(int id, QPointF position)
{
id_ = id;
count_ = 0;
trail_.fill(position, NUM_TRAIL_POINTS);
setPos(position.x(), position.y());
velocity_ = QPointF( 0.1, 0.1 );
tailOn_ = true;
}
Boid::~Boid()
{}
QPointF Boid::velocity() const
{
return velocity_;
}
void Boid::setVelocity( QPointF velocity )
{
velocity_ = velocity;
}
QRectF Boid::boundingRect() const
{
return QRectF( -1, -1, 2, 2 );
}
void Boid::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
QWidget *widget)
{
Q_UNUSED( option ); Q_UNUSED( widget );
painter->setRenderHints( QPainter::Antialiasing );
QPen pen;
int baseHue = msSinceStart_ % 359;
int trailLength = trail_.size()-1;
for ( int pointIndex = 0; pointIndex < trailLength; pointIndex++ )
{
if ( trail_.at(pointIndex+1).isNull() ) {
continue;
}
int value;
int saturation;
// The 'head' of the trail.
if ( pointIndex < 50 )
{
pen.setWidthF( sin( pointIndex ) + 2 );
saturation = 255 - ( pow( sin( 50*static_cast<float>(NUM_TRAIL_POINTS-pointIndex) ), 2 ) * 200);
value = (static_cast<float>(NUM_TRAIL_POINTS-pointIndex)/NUM_TRAIL_POINTS)*255;
pen.setBrush( QColor::fromHsv( std::min( baseHue+7*id_, 359 ), saturation, value ) );
painter->setPen( pen );
painter->drawLine( mapFromScene( trail_[pointIndex] ), mapFromScene( trail_[pointIndex+1] ) );
} else if ( pointIndex >= 50 && tailOn_ ) // The rest of the trail.
{
pen.setWidth( 1 );
value = (static_cast<float>(NUM_TRAIL_POINTS-pointIndex)/NUM_TRAIL_POINTS)*150;
saturation = value;
pen.setBrush( QColor::fromHsv( std::min( baseHue+7*id_, 359 ), saturation, value ) );
painter->setPen( pen );
painter->drawLine( mapFromScene( trail_[pointIndex] ), mapFromScene( trail_[pointIndex+1] ) );
}
// if ( pointIndex > ( NUM_TRAIL_POINTS-150 ) ) {
// pen.setWidthF( ( float( (pointIndex-(NUM_TRAIL_POINTS-150)) )/NUM_TRAIL_POINTS ) *160 );
// }
}
pen.setWidth( 1 );
pen.setBrush( Qt::yellow );
pen.setColor( Qt::yellow );
painter->setPen( pen );
painter->drawEllipse( -2, -2, 4, 4 );
}
void Boid::addToTrail( int x, int y )
{
QPointF point( x, y );
trail_.pop_back();
trail_.prepend( point );
}
void Boid::limitVelocity()
{
int vlim = 10;
float magnitude = sqrt( pow(velocity_.x(),2) + pow(velocity_.y(),2) );
if ( magnitude > vlim )
{
setVelocity( ( velocity_ / magnitude ) * vlim );
}
}
void Boid::setVelocityX( int velX )
{
velocity_.setX( velX );
}
void Boid::setVelocityY( int velY )
{
velocity_.setY( velY );
}
void Boid::setMsSinceStart( int msSinceStart )
{
msSinceStart_ = msSinceStart;
}
void Boid::setTail( bool tailOn )
{
tailOn_ = tailOn;
if ( tailOn == true )
trail_.resize( NUM_TRAIL_POINTS );
else
trail_.resize( 50 );
}