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Merge pull request #422 from breedx2/add_81_splat_java
Add 81 Splat.java
This commit is contained in:
Jeff Atwood
@@ -1,3 +1,3 @@
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Original source downloaded [from Vintage Basic](http://www.vintage-basic.net/games.html)
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Conversion to [Oracle Java](https://openjdk.java.net/)
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Conversion to [Java](https://openjdk.java.net/)
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348
81_Splat/java/src/Splat.java
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348
81_Splat/java/src/Splat.java
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@@ -0,0 +1,348 @@
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import java.util.*;
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/**
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* SPLAT simulates a parachute jump in which you try to open your parachute at the last possible moment without going
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* splat! You may select your own terminal velocity or let the computer do it for you. You many also select the
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* acceleration due to gravity or, again, let the computer do it in which case you might wind up on any of eight
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* planets (out to Neptune), the moon, or the sun.
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* <p>
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* The computer then tells you the height you’re jumping from and asks for the seconds of free fall. It then divides
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* your free fall time into eight intervals and gives you progress reports on your way down. The computer also keeps
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* track of all prior jumps in the array A and lets you know how you compared with previous successful jumps. If you
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* want to recall information from previous runs, then you should store array A in a disk or take file and read it
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* before each run.
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* <p>
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* John Yegge created this program while at the Oak Ridge Associated Universities.
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* <p>
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* Ported from BASIC by jason plumb (@breedx2)
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* </p>
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*/
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public class Splat {
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private static final Random random = new Random();
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private final Scanner scanner = new Scanner(System.in);
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private final List<Float> pastSuccessfulJumpDistances = new ArrayList<>();
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public static void main(String[] args) {
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new Splat().run();
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}
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public void run() {
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showIntroduction();
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while (true) {
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InitialJumpConditions initial = buildInitialConditions();
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System.out.println();
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System.out.printf(" ALTITUDE = %d FT\n", initial.getAltitude());
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System.out.printf(" TERM. VELOCITY = %.2f FT/SEC +/-5%%\n", initial.getOriginalTerminalVelocity());
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System.out.printf(" ACCELERATION = %.2f FT/SEC/SEC +/-5%%\n", initial.getOriginalAcceleration());
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System.out.println("SET THE TIMER FOR YOUR FREEFALL.");
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System.out.print("HOW MANY SECONDS ");
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float freefallTime = scanner.nextFloat();
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System.out.println("HERE WE GO.\n");
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System.out.println("TIME (SEC) DIST TO FALL (FT)");
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System.out.println("========== =================");
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JumpResult jump = executeJump(initial, freefallTime);
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showJumpResults(initial, jump);
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if (!playAgain()) {
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System.out.println("SSSSSSSSSS.");
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return;
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}
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}
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}
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private void showIntroduction() {
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System.out.printf("%33s%s\n", " ", "SPLAT");
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System.out.printf("%15s%s\n", " ", "CREATIVE COMPUTING MORRISTOWN, NEW JERSEY");
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System.out.print("\n\n\n");
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System.out.println("WELCOME TO 'SPLAT' -- THE GAME THAT SIMULATES A PARACHUTE");
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System.out.println("JUMP. TRY TO OPEN YOUR CHUTE AT THE LAST POSSIBLE");
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System.out.println("MOMENT WITHOUT GOING SPLAT.");
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}
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private InitialJumpConditions buildInitialConditions() {
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System.out.print("\n\n");
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float terminalVelocity = promptTerminalVelocity();
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float acceleration = promptGravitationalAcceleration();
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return InitialJumpConditions.create(terminalVelocity, acceleration);
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}
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private float promptTerminalVelocity() {
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if (askYesNo("SELECT YOUR OWN TERMINAL VELOCITY")) {
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System.out.print("WHAT TERMINAL VELOCITY (MI/HR) ");
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return mphToFeetPerSec(scanner.nextFloat());
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}
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float terminalVelocity = (int) (1000 * random.nextFloat());
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System.out.printf("OK. TERMINAL VELOCITY = %.2f MI/HR\n", terminalVelocity);
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return mphToFeetPerSec(terminalVelocity);
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}
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private float promptGravitationalAcceleration() {
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if (askYesNo("WANT TO SELECT ACCELERATION DUE TO GRAVITY")) {
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System.out.print("WHAT ACCELERATION (FT/SEC/SEC) ");
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return scanner.nextFloat();
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}
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return chooseRandomAcceleration();
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}
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private JumpResult executeJump(InitialJumpConditions initial, float chuteOpenTime) {
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JumpResult jump = new JumpResult(initial.getAltitude());
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for (float time = 0.0f; time < chuteOpenTime; time += chuteOpenTime / 8) {
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if (!jump.hasReachedTerminalVelocity() && time > initial.getTimeOfTerminalAccelerationReached()) {
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jump.setReachedTerminalVelocity();
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System.out.printf("TERMINAL VELOCITY REACHED AT T PLUS %f SECONDS.\n", initial.getTimeOfTerminalAccelerationReached());
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}
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float newDistance = computeDistance(initial, time, jump.hasReachedTerminalVelocity());
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jump.setDistance(newDistance);
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if (jump.isSplat()) {
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return jump;
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}
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System.out.printf("%10.2f %f\n", time, jump.getDistance());
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}
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return jump;
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}
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private float computeDistance(InitialJumpConditions initial, float i, boolean hasReachedTerminalVelocity) {
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final float V = initial.getTerminalVelocity();
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final float A = initial.getAcceleration();
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if (hasReachedTerminalVelocity) {
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return initial.getAltitude() - ((V * V / (2 * A)) + (V * (i - (V / A))));
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}
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return initial.getAltitude() - ((A / 2) * i * i);
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}
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private void showJumpResults(InitialJumpConditions initial, JumpResult jump) {
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if (jump.isSplat()) {
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showSplatMessage(initial, jump);
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showCleverSplatMessage();
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return;
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}
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System.out.println("CHUTE OPEN");
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int worseJumpCount = countWorseHistoricalJumps(jump);
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int successfulJumpCt = pastSuccessfulJumpDistances.size();
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pastSuccessfulJumpDistances.add(jump.getDistance());
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if (pastSuccessfulJumpDistances.size() <= 2) {
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List<String> ordinals = Arrays.asList("1ST", "2ND", "3RD");
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System.out.printf("AMAZING!!! NOT BAD FOR YOUR %s SUCCESSFUL JUMP!!!\n", ordinals.get(successfulJumpCt));
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return;
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}
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int betterThanCount = successfulJumpCt - worseJumpCount;
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if (betterThanCount <= 0.1 * successfulJumpCt) {
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System.out.printf("WOW! THAT'S SOME JUMPING. OF THE %d SUCCESSFUL JUMPS\n", successfulJumpCt);
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System.out.printf("BEFORE YOURS, ONLY %d OPENED THEIR CHUTES LOWER THAN\n", betterThanCount);
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System.out.println("YOU DID.");
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} else if (betterThanCount <= 0.25 * successfulJumpCt) {
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System.out.printf("PRETTY GOOD! %d SUCCESSFUL JUMPS PRECEDED YOURS AND ONLY\n", successfulJumpCt);
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System.out.printf("%d OF THEM GOT LOWER THAN YOU DID BEFORE THEIR CHUTES\n", betterThanCount);
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System.out.println("OPENED.");
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} else if (betterThanCount <= 0.5 * successfulJumpCt) {
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System.out.printf("NOT BAD. THERE HAVE BEEN %d SUCCESSFUL JUMPS BEFORE YOURS.\n", successfulJumpCt);
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System.out.printf("YOU WERE BEATEN OUT BY %d OF THEM.\n", betterThanCount);
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} else if (betterThanCount <= 0.75 * successfulJumpCt) {
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System.out.printf("CONSERVATIVE, AREN'T YOU? YOU RANKED ONLY %d IN THE\n", betterThanCount);
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System.out.printf("%d SUCCESSFUL JUMPS BEFORE YOURS.\n", successfulJumpCt);
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} else if (betterThanCount <= -0.9 * successfulJumpCt) {
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System.out.println("HUMPH! DON'T YOU HAVE ANY SPORTING BLOOD? THERE WERE");
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System.out.printf("%d SUCCESSFUL JUMPS BEFORE YOURS AND YOU CAME IN %d JUMPS\n", successfulJumpCt, worseJumpCount);
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System.out.println("BETTER THAN THE WORST. SHAPE UP!!!\n");
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} else {
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System.out.printf("HEY! YOU PULLED THE RIP CORD MUCH TOO SOON. %d SUCCESSFUL\n", successfulJumpCt);
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System.out.printf("JUMPS BEFORE YOURS AND YOU CAME IN NUMBER %d! GET WITH IT!\n", betterThanCount);
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}
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}
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private void showSplatMessage(InitialJumpConditions initial, JumpResult jump) {
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double timeOfSplat = computeTimeOfSplat(initial, jump);
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System.out.printf("%10.2f SPLAT\n", timeOfSplat);
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}
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/**
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* Returns the number of jumps for which this jump was better
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*/
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private double computeTimeOfSplat(InitialJumpConditions initial, JumpResult jump) {
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final float V = initial.getTerminalVelocity();
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final float A = initial.getAcceleration();
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if (jump.hasReachedTerminalVelocity()) {
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return (V / A) + ((initial.getAltitude() - (V * V / (2 * A))) / V);
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}
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return Math.sqrt(2 * initial.getAltitude() / A);
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}
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private int countWorseHistoricalJumps(JumpResult jump) {
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return (int) pastSuccessfulJumpDistances.stream()
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.filter(distance -> jump.getDistance() < distance)
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.count();
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}
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private void showCleverSplatMessage() {
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List<String> messages = Arrays.asList(
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"REQUIESCAT IN PACE.",
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"MAY THE ANGEL OF HEAVEN LEAD YOU INTO PARADISE.",
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"REST IN PEACE.",
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"SON-OF-A-GUN.",
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"#$%&&%!$",
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"A KICK IN THE PANTS IS A BOOST IF YOU'RE HEADED RIGHT.",
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"HMMM. SHOULD HAVE PICKED A SHORTER TIME.",
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"MUTTER. MUTTER. MUTTER.",
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"PUSHING UP DAISIES.",
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"EASY COME, EASY GO."
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);
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System.out.println(messages.get(random.nextInt(10)));
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}
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private boolean playAgain() {
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if (askYesNo("DO YOU WANT TO PLAY AGAIN ")) {
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return true;
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}
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return askYesNo("PLEASE");
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}
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private float mphToFeetPerSec(float speed) {
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return speed * (5280.0f / 3600.0f);
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}
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private boolean askYesNo(String prompt) {
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System.out.printf("%s (YES OR NO) ", prompt);
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while (true) {
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String answer = scanner.next();
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switch (answer) {
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case "YES":
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return true;
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case "NO":
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return false;
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default:
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System.out.print("YES OR NO ");
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}
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}
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}
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private float chooseRandomAcceleration() {
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Planet planet = Planet.pickRandom();
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System.out.printf("%s %s. ACCELERATION=%.2f FT/SEC/SEC.\n", planet.getMessage(), planet.name(), planet.getAcceleration());
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return planet.getAcceleration();
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}
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enum Planet {
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MERCURY("FINE. YOU'RE ON", 12.2f),
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VENUS("ALL RIGHT. YOU'RE ON", 28.3f),
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EARTH("THEN YOU'RE ON", 32.16f),
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MOON("FINE. YOU'RE ON THE", 5.15f),
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MARS("ALL RIGHT. YOU'RE ON", 12.5f),
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JUPITER("THEN YOU'RE ON", 85.2f),
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SATURN("FINE. YOU'RE ON", 37.6f),
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URANUS("ALL RIGHT. YOU'RE ON", 33.8f),
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NEPTUNE("THEN YOU'RE ON", 39.6f),
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SUN("FINE. YOU'RE ON THE", 896.0f);
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private static final Random random = new Random();
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private final String message;
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private final float acceleration;
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Planet(String message, float acceleration) {
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this.message = message;
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this.acceleration = acceleration;
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}
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static Planet pickRandom() {
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return values()[random.nextInt(Planet.values().length)];
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}
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String getMessage() {
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return message;
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}
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float getAcceleration() {
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return acceleration;
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}
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}
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// Mutable
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static class JumpResult {
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private boolean reachedTerminalVelocity = false;
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private float distance; // from the ground
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public JumpResult(float distance) {
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this.distance = distance;
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}
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boolean isSplat() {
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return distance <= 0;
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}
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boolean hasReachedTerminalVelocity() {
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return reachedTerminalVelocity;
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}
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float getDistance() {
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return distance;
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}
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void setDistance(float distance) {
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this.distance = distance;
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}
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void setReachedTerminalVelocity() {
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reachedTerminalVelocity = true;
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}
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}
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// Immutable
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static class InitialJumpConditions {
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private final float originalTerminalVelocity;
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private final float originalAcceleration;
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private final float terminalVelocity;
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private final float acceleration;
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private final int altitude;
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private InitialJumpConditions(float originalTerminalVelocity, float originalAcceleration,
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float terminalVelocity, float acceleration, int altitude) {
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this.originalTerminalVelocity = originalTerminalVelocity;
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this.originalAcceleration = originalAcceleration;
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this.terminalVelocity = terminalVelocity;
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this.acceleration = acceleration;
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this.altitude = altitude;
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}
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// Create initial jump conditions with adjusted velocity/acceleration and a random initial altitude
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private static InitialJumpConditions create(float terminalVelocity, float gravitationalAcceleration) {
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final int altitude = (int) (9001.0f * random.nextFloat() + 1000);
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return new InitialJumpConditions(terminalVelocity, gravitationalAcceleration,
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plusMinus5Percent(terminalVelocity), plusMinus5Percent(gravitationalAcceleration), altitude);
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}
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private static float plusMinus5Percent(float value) {
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return value + ((value * random.nextFloat()) / 20.0f) - ((value * random.nextFloat()) / 20.0f);
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}
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float getOriginalTerminalVelocity() {
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return originalTerminalVelocity;
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}
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float getOriginalAcceleration() {
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return originalAcceleration;
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}
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float getTerminalVelocity() {
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return terminalVelocity;
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}
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float getAcceleration() {
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return acceleration;
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}
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int getAltitude() {
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return altitude;
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}
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float getTimeOfTerminalAccelerationReached() {
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return terminalVelocity / acceleration;
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}
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}
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}
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