public int x, y;

private int r;

public int vx, vy;

public boolean isFilled = false;

public Circle(int x, int y, int r, int vx, int vy) {

this.x = x;

this.y = y;

this.r = r;

this.vx = vx;

this.vy = vy;

}

public int getR() {

return r;

}

public void move(int minx, int miny, int maxx, int maxy) {

x += vx;

y += vy;

checkCollision(minx, miny, maxx, maxy);

}

private void checkCollision(int minx, int miny, int maxx, int maxy) {

if (x - r < minx) {

x = r;

vx = -vx;

}

if (x + r >= maxx) {

x = maxx - r;

vx = -vx;

}

if (y - r < miny) {

y = r;

vy = -vy;

}

if (y + r >= maxy) {

y = maxy - r;

vy = -vy;

}

}

public boolean contain(Point point) {

return (x - point.x) * (x - point.x) + (y - point.y) * (y - point.y) <= r * r;

}