/** Centres the particle view on the currently visible nodes. */
private void updateCentroid() {
float xMax = Float.NEGATIVE_INFINITY,
xMin = Float.POSITIVE_INFINITY,
yMin = Float.POSITIVE_INFINITY,
yMax = Float.NEGATIVE_INFINITY;
for (int i = 0; i < physics.getNumParticles(); ++i) {
Particle p = physics.getParticle(i);
xMax = Math.max(xMax, p.position().x());
xMin = Math.min(xMin, p.position().x());
yMin = Math.min(yMin, p.position().y());
yMax = Math.max(yMax, p.position().y());
}
float xRange = xMax - xMin;
float yRange = yMax - yMin;
if ((xRange == 0) && (yRange == 0)) {
xRange = Math.max(1, xMax);
yRange = Math.max(1, yMax);
}
float zScale = (float) Math.min(height / (yRange * 1.2), width / (xRange * 1.2));
centroid.setTarget(xMin + 0.5f * xRange, yMin + 0.5f * yRange, zScale);
}
