#include "franca.h" // c52001.cpp

#include <math.h>

const float pi=3.14159;

void polarxy(float r,float teta,float x0,

float y0,float &x,float &y)

{

x=r*cos(teta)+x0;

y=r*sin(teta)+y0;

}

void mainprog()

{

const float earthradius=160.,moonradius=40.;

const float earthsize= 30., moonsize=16., sunsize = 80.;

Stage universe;

universe.origin(240.,240.);

universe.scale(1.,-1.);

Square sky;

sky.place(80,0);

sky.resize(480,640);

sky.color(7,7);

 

// set Sun's data:

Circle sun; // declare sun shape

float xsun=0,ysun=0; // initial coordinates;

sun.resize(sunsize);

sun.color(6,6);

sun.place(xsun,ysun);

universe.insert(sun);

// set Earth's data:

Circle earth; // declare earth's shape

float xearth=earthradius,yearth=0.; // initial coordinates

float wearth=(2*pi)/365.25;// angular speed radians per day

earth.resize(earthsize);

earth.color(4,4);

earth.place(xsun+earthradius,ysun);

universe.insert(earth);

// set moon's data:

Circle moon;

float xmoon=moonradius,ymoon=0;

float wmoon=(2*pi)/27.; // angular speed

moon.resize(moonsize);

moon.color(0,0);

moon.place(xsun+earthradius+moonradius,ysun);

universe.insert(moon);

// Special effects:

sky.show();

Circle light;

light.place(0,0);

light.color(3,3);

light.resize(2);

int grow=2;

for (;grow<=480;grow++)

{

Clock timer;

light.resize(grow);

sun.resize(grow/6);

light.show();

sun.show();

timer.watch(0.03);

timer.reset();

}

//sky.place(80,0);

//sky.resize(480,640);

sky.color(3,3);

sky.show();

//universe.insert(sky);

//

 

//float orbitradius,angle,lastframetime;

float time,timescale=10.;

Box day("Day:");

Clock sideral;

Clock stopwatch;

time=sideral.time()*timescale;

for (;time<365.25;)

{

//universe.erase();

//sky.show();

polarxy(earthradius,wearth*time,xsun,ysun,xearth,yearth);

earth.place(xearth,yearth);

polarxy(moonradius,wmoon*time,xearth,yearth,xmoon,ymoon);

moon.place(xmoon,ymoon);

//day.say(time);

sky.show();

universe.show();

stopwatch.watch(.033);

stopwatch.reset();

time=sideral.time()*timescale;

}

}