Я делаю игру и застрял с обнаружением столкновения не с вертикальной или горизонтальной линией с мячом. У меня есть класс для обнаружения столкновения с шарика на шар
мой источник:
private boolean calcCollision(balls i, balls j) {
double x, y, d2;
// displacement from i to j
y = (j.y - i.y);
x = (j.x - i.x);
// distance squared
d2 = x * x + y * y;
// dividing by 0 is bad
if (d2 == 0.)
return false;
// if d^2 < (25)^2, the ballss have collided
if (d2 < 625.) {
double kii, kji, kij, kjj;
kji = (x * i.dx + y * i.dy) / d2; // k of j due to i
kii = (x * i.dy - y * i.dx) / d2; // k of i due to i
kij = (x * j.dx + y * j.dy) / d2; // k of i due to j
kjj = (x * j.dy - y * j.dx) / d2; // k of j due to j
// set velocity of i
i.dy = kij * y + kii * x;
i.dx = kij * x - kii * y;
// set velocity of j
j.dy = kji * y + kjj * x;
j.dx = kji * x - kjj * y;
return true;
}
return false;
}
private void calcFriction(balls d) {
double k = (d.dx * d.dx + d.dy * d.dy);
k = Math.sqrt(k) * 26;
// dividng by zero is bad
if (k == 0)
return;
// set ddx and ddy
d.ddy = -d.dy / k;
d.ddx = -d.dx / k;
}
private void fixOverlap(balls i, balls j) {
double x, y, k;
// the real displacement from i to j
y = (j.y - i.y);
x = (j.x - i.x);
// the ratio between what it should be and what it really is
k = 25.1 / Math.sqrt(x * x + y * y);
// difference between x and y component of the two vectors
y *= (k - 1) / 2.;
x *= (k - 1) / 2;
// set new coordinates of ballss
j.y += y;
j.x += x;
i.y -= y;
i.x -= x;
}
private void doFriction(balls d) {
d.dy += d.ddy;
d.dx += d.ddx;
// if dx and ddx now have the same sign then stop
if (d.dx > 0 == d.ddx > 0) {
d.dx = 0;
checkReady(); // check ready after stopping
} if (d.dy > 0 == d.ddy > 0) {
d.dy = 0;
checkReady();
}
}
private void checkBounds(balls d) {
// hit top or bottom
if (d.y > board.getHeight() - ballRadius) {
d.dy = -Math.abs(d.dy);
d.ddy = Math.abs(d.ddy);
} else if (d.y < 0.) {
d.dy = Math.abs(d.dy);
d.ddy = -Math.abs(d.ddy);
}
// hit left or right side
if (d.x > board.getWidth() - ballRadius) {
d.dx = -Math.abs(d.dx);
d.ddx = Math.abs(d.ddx);
} else if (d.x < 0.) {
d.dx = Math.abs(d.dx);
d.ddx = -Math.abs(d.ddx);
}
}
private void calcPositions() {
try {
int a, b;
balls i, j;
for (a = 0; a < balls.size(); a++) {
i = balls.elementAt(a);
// check if balls is moving
if (i.dy != 0 || i.dx != 0) {
// move balls
i.y += i.dy;
i.x += i.dx;
if (friction)
doFriction(i);
}
// check fall off the board
checkBounds(i);
// check if balls has collided with any balls after it
for (b = a + 1; b < balls.size(); b++) {
j = balls.elementAt(b);
// if they collided
if (calcCollision(i, j)) {
// fix possible overlapping
if (overlap)
fixOverlap(i, j);
// calc new friction of ballss i and j
calcFriction(i);
calcFriction(j);
}
}
}
} catch (Exception ex) {
System.out.println(ex.getMessage());
}
}
Может быть, кто-то может помочь