第三回 冬のスイッチ大勉強会 - Particle編 -

1. Switch_lecture
Simple particle

2. Create class
( Xcode )
“src” -> control + click
New File...
Select “C++ File” & Next
Set name “particle” & Next
Create

3. Simple particle
( 0, 0 )
y
x
position
( ofVec2f )
velocity
( ofVec2f )
radius
( float )
color( ofColor )
lifeSpan( float )
dead( bool )

4. Structure of class
Particle()
~Particle()
set******()
get******()
Constructor
Call when creating object
Call when deleting object
Set property
Get property
Destructor
Setter
Getter
position
private
public
Property
Method
Particle()
setPosition()
getPosition()
~Particle()
velocity
radius
color
lifeSpan
dead

5. Class
( openFrameworks )
Property Setter & Getter
ofVec2f position
ofVec2f velocity
float radius
ofColor color
bool dead
ofApp
ofVec2f
ofVec2f
ofVec2f
ofVec2f
float
float
ofColor
ofColor
bool
void setPosition( ofVec2f _p )
ofVec2f getPosition()
void setVelocity( ofVec2f _v )
ofVec2f getVelocity()
void setRadius( float _r )
float getRadius()
void setColor( float _c )
ofColor getColor()
bool isDead()

6. Simple particle class
( openFrameworks )
particle.h
Property
Constructor
Destructor
Setter
Getter
particle.cpp
#include "ofMain.h"
class Particle
{
private:
ofVec2f pos;
ofVec2f vel;
float radius;
ofColor color;
float lifeSpan;
bool dead;
public:
Particle();
~Particle();
void setPosition( ofVec2f _p );
void setVelocity( ofVec2f _v );
void setRadius( float _r );
void setColor( ofColor _c );
ofVec2f getPosition();
ofVec2f getVelocity();
float getRadius();
ofColor getColor();
bool isDead();
void update();
void draw();
};
#include “particle.h”
Particle::Particle()
{
pos.set( 0, 0 );
float angle = ofRandom( TWO_PI );
vel.set( cos( angle ), sin( angle ) );
radius = ofRandom( 1, 6 );
color.set( 0, 0, 0 );
lifeSpan = ofGetElapsedTimef() + ofRandom( 2, 4 );
dead = false;
}
Particle::~Particle(){}
void Particle::setPosition( ofVec2f _p ){ pos = _p; }
void Particle::setVelocity( ofVec2f _v ){ vel = _v; }
void Particle::setRadius( float _r ){ radius = _r; }
void Particle::setColor( ofColor _c ){ color = _c; }
ofVec2f Particle::getPosition(){ return pos; }
ofVec2f Particle::getVelocity(){ return vel; }
float Particle::getRadius(){ return radius; }
ofColor Particle::getColor(){ return color; }
bool Particle::isDead(){ return dead; }
void Particle::update()
{
pos += vel;
if( ofGetElapsedTimef() > lifeSpan ) dead = true;
}
void Particle::draw()
{
ofSetColor( color );
ofFill();
ofCircle( pos, radius );
}
Constructor
Setter
Getter
Destructor

7. Simple particle class
( openFrameworks )
Update & Delete
particles
Draw particles
Add particles
ofApp.h ofApp.cpp
#include "ofMain.h"
#include "particle.h"
class ofApp : public ofBaseApp
{
public:
void setup();
void update();
void draw();
void mouseDragged( int x, int y, int button );
vector< Particle > particles;
};
void ofApp::setup()
{
ofBackground( 255 );
}
void ofApp::update()
{
for( vector< Particle >::iterator itr = particles.begin(); itr != particles.end(); )
{
( *itr ).update();
if( ( *itr ).isDead() ) particles.erase( itr );
else ++itr;
}
}
void ofApp::draw()
{
for( int i = 0; i < particles.size(); ++i ) particles.at( i ).draw();
}
void ofApp::mouseDragged( int x, int y, int button )
{
Particle p;
p.setPosition( ofVec2f( x, y ) );
particles.push_back( p );
}