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| #ifndef hpp__Circle__hpp
#define hpp__Circle__hpp
#include<cmath>
#include<time.h>
#include <vector>
using namespace std;
#define CIRCLE_WIN_WIDTH 200
#define CIRCLE_WIN_HEIGHT 150
#define SIZE 10
class Circle
{
public :
int x, y, radius;
Colour color;
Circle() {}
Circle(int _x, int _y, int r, Colour _color)
: x(_x), y(_y), radius(r), color(_color)
{}
};
class Circles
{
private :
vector <Circle*> circles;
double speed;
int signum(int n)
{
if (n < 0)
return -1;
if (n > 0)
return 1;
return n;
}
int round (double n)
{
double result = n + .5;
if (result < 0)
--result;
return (int)result;
}
static int getRandomSize(int max)
{
return (rand() % max) + 1;
}
double max (double d1, double d2)
{
if (d1 > d2)
return d1;
return d2;
}
public :
Circles() : speed (.1)
{
/* srand(time(NULL));
for (int i = 0; i < SIZE; i++)
{
circles.push_back(new Circle(getRandomSize(CIRCLE_WIN_WIDTH), getRandomSize(CIRCLE_WIN_HEIGHT), getRandomSize(CIRCLE_WIN_WIDTH/2), Colour(i*10, 1, i)));
}*/
/*circles[0] = Circle(400, 500, 200, Colour(1, 1, 1));
circles[1] = Circle(300, 200, 300, Colour(5, 20, 2));
circles[2] = Circle(500, 700, 200, Colour(100, 0, 3)); */
}
~Circles() {}
Circle* getCircle(int i)
{
if (i >= (int)circles.size())
return NULL;
return circles[i];
}
int getSize ()
{
return circles.size();
}
bool move(double speed)
{
bool hasmoved = false;
// for each circle in the list
for (int i = 0; i < (int)circles.size(); i++) {
Circle ci = *circles[i];
// move remaining overlapping circles
for (int j = 1+j; j < (int)circles.size(); j++) {
Circle cj = *circles[j];
int dcenter = (int) sqrt((ci.x - cj.x) * (ci.x - cj.x) + (ci.y - cj.y) * (ci.y - cj.y));
int sumradius = ci.radius + cj.radius;
int recover = sumradius - dcenter;
if (recover < 0) continue;
// move both circles (one in each direction, half the distance)
int delta = recover/2;
delta = (int) max(1.0, speed * delta);
double dx = (double) (ci.x - cj.x) / (double) dcenter;
double dy = (double) (ci.y - cj.y) / (double) dcenter;
(*circles[i]).x = (int) round(ci.x + delta * dx); // circle 1
(*circles[i]).y = (int) round(ci.y + delta * dy); //
(*circles[j]).x = (int) round(cj.x - delta * dx); // circle 2
(*circles[j]).y = (int) round(cj.y - delta * dy); //
hasmoved = true;
}
// limit to screen dimension
if (ci.x - ci.radius < 0) (*circles[i]).x = ci.radius;
if (ci.x + ci.radius > CIRCLE_WIN_WIDTH) (*circles[i]).x = CIRCLE_WIN_WIDTH - ci.radius;
if (ci.y - ci.radius < 0) (*circles[i]).y = ci.radius;
if (ci.y + ci.radius > CIRCLE_WIN_HEIGHT) (*circles[i]).y = CIRCLE_WIN_HEIGHT - ci.radius;
}
return hasmoved;
}
void add()
{
// random position & size
int r = getRandomSize(CIRCLE_WIN_HEIGHT/2);
int x = getRandomSize(CIRCLE_WIN_WIDTH - 2 * r) + r;
int y = getRandomSize(CIRCLE_WIN_HEIGHT - 2 * r) + r;
circles.push_back(new Circle(x, y, r, Colour(getRandomSize(100), getRandomSize(100), getRandomSize(100))));
Thread::sleep(300);
move();
}
private :
void move() {
for(int loop=0;loop<100;loop++) {
// speed up: fast -> slow
double t=loop/100.0;
double speed = (1.0)*(1-t) + (0.1)*(t);
if (!move(speed)) {
break;
}
}
}
};
#endif // hpp__Circle__hpp |
