public void updatePosition(float dt) {
if (fixed) {
netForce.reset(); // Shouldn't accumulate forces if fixed
return;
}
updateAcceleration(dt);
updateVelocity(dt);
Point prev = new Point(pos.x, pos.y);
pos.add(vel.copy().scale(dt, dt));
ensureInBounds();
}
private Point getOffset(Rect r) {
Point screenCenter = new Point((bounds.x + bounds.w / 2), (bounds.y + bounds.h / 2));
Point rectCenter = r.getCenter();
Point diff = rectCenter.diff(screenCenter).scale(PERCENT_DIST, PERCENT_DIST);
return diff;
}
private void ensureInBounds() {
if (bounds == null) {
bounds = new Rect(0, 0, width, height);
}
float xMin = bounds.x + radius;
float xMax = bounds.w + bounds.x - radius;
float yMin = bounds.y + radius;
float yMax = (bounds.h + bounds.y) - radius;
if (pos.x < xMin) {
pos.x = xMin;
vel.x *= COLLISION_SCALE;
} else if (pos.x > xMax) {
pos.x = xMax;
vel.x *= COLLISION_SCALE;
}
if (pos.y < yMin) {
pos.y = yMin;
vel.y *= COLLISION_SCALE;
} else if (pos.y > yMax) {
pos.y = yMax;
vel.y *= COLLISION_SCALE;
}
Float p1 = new Float(pos.x);
Float p2 = new Float(pos.y);
Float v1 = new Float(vel.x);
Float v2 = new Float(vel.y);
// If anything is NaN -- make new Point and Velocity
if (p1.isNaN(p1) || p2.isNaN(p2) || v1.isNaN(v1) || v2.isNaN(v2)) {
pos = new Point(random(width), random(height)); // Place new point randomly
vel = new Vector(0.0f, 0.0f); // Start it out with no movement
}
}