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package spirals;
import processing.core.*;

public class Main extends PApplet
{
    float x;
    float y;
    int i = 1;
    int dia = 1;
    
    float angle = 0.0f;
    float speed = 0.05f;
    float orbit = 0f;
    
    //color palette
    int gray = 0x0444444;
    int blue = 0x07cb5f7;
    int pink = 0x0f77cb5;
    int green = 0x0b5f77c;
    
    public Main(){}
    
    public static void main( String[] args )
    {
        PApplet.main( new String[] { "spirals.Main" } );
    }
    
    public void setup()
    {
        background( gray );
        size( 400, 400 );
        fill( gray );
        stroke( gray );
        strokeWeight( 4 );
        smooth();
    }
    
    public void draw()
    {   
        //take the mod of i and decide what to
        //set as the fill color
        if( i % 11 == 0 )
            fill( green );
        else if( i % 13 == 0 )
            fill( blue );
        else if( i % 15 == 0 )
            fill( pink );
        else if( i % 17 == 0 )
            fill( gray );
        
        orbit += 0.1f; //ever so slightly increase the orbit
        //speed += 0.00001f; acceleration
        angle += speed % ( width * height );
        
        float sinval = sin( angle );
        float cosval = cos( angle );
        
        //calculate the (x, y) to produce an orbit
        x = ( width / 2 ) + ( cosval * orbit );
        y = ( height / 2 ) + ( sinval * orbit );
        
        dia %= 11; //keep the diameter within bounds.
        ellipse( x, y, dia, dia );
        dia++;
        i++;
    }
}