Java, Simulation, Programming, Science, Coding.
if (this == that) return Double.POSITIVE_INFINITY; double dx = that.rx - this.rx; double dy = that.ry - this.ry; double dvx = that.vx - this.vx; double dvy = that.vy - this.vy; double dvdr = dx * dvx + dy * dvy; if (dvdr > 0) return Double.POSITIVE_INFINITY; double dvdv = dvx * dvx + dvy * dvy; if