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add top comment copied from readme (includes attribution) and reorganize methods for readability.

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jason
2022-01-05 00:12:43 -08:00
parent 11dba9dd92
commit 18b37bda81
1 changed files with 109 additions and 87 deletions
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178
81_Splat/java/src/Splat.java
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@@ -1,5 +1,22 @@
import java.util.*;
/**
* SPLAT simulates a parachute jump in which you try to open your parachute at the last possible moment without going
* splat! You may select your own terminal velocity or let the computer do it for you. You many also select the
* acceleration due to gravity or, again, let the computer do it in which case you might wind up on any of eight
* planets (out to Neptune), the moon, or the sun.
* <p>
* The computer then tells you the height you’re jumping from and asks for the seconds of free fall. It then divides
* your free fall time into eight intervals and gives you progress reports on your way down. The computer also keeps
* track of all prior jumps in the array A and lets you know how you compared with previous successful jumps. If you
* want to recall information from previous runs, then you should store array A in a disk or take file and read it
* before each run.
* <p>
* John Yegge created this program while at the Oak Ridge Associated Universities.
* <p>
* Ported from BASIC by jason plumb (@breedx2)
* </p>
*/
public class Splat {
private static final Random random = new Random();
private final Scanner scanner = new Scanner(System.in);
@@ -31,13 +48,74 @@ public class Splat {
JumpResult jump = executeJump(initial, freefallTime);
showJumpResults(initial, jump);
if(!playAgain()){
if (!playAgain()) {
System.out.println("SSSSSSSSSS.");
return;
}
}
}
private void showIntroduction() {
System.out.printf("%33s%s\n", " ", "SPLAT");
System.out.printf("%15s%s\n", " ", "CREATIVE COMPUTING MORRISTOWN, NEW JERSEY");
System.out.print("\n\n\n");
System.out.println("WELCOME TO 'SPLAT' -- THE GAME THAT SIMULATES A PARACHUTE");
System.out.println("JUMP. TRY TO OPEN YOUR CHUTE AT THE LAST POSSIBLE");
System.out.println("MOMENT WITHOUT GOING SPLAT.");
}
private InitialJumpConditions buildInitialConditions() {
System.out.print("\n\n");
float terminalVelocity = promptTerminalVelocity();
float acceleration = promptGravitationalAcceleration();
return InitialJumpConditions.create(terminalVelocity, acceleration);
}
private float promptTerminalVelocity() {
if (askYesNo("SELECT YOUR OWN TERMINAL VELOCITY")) {
System.out.print("WHAT TERMINAL VELOCITY (MI/HR) ");
return mphToFeetPerSec(scanner.nextFloat());
}
float terminalVelocity = (int) (1000 * random.nextFloat());
System.out.printf("OK. TERMINAL VELOCITY = %.2f MI/HR\n", terminalVelocity);
return mphToFeetPerSec(terminalVelocity);
}
private float promptGravitationalAcceleration() {
if (askYesNo("WANT TO SELECT ACCELERATION DUE TO GRAVITY")) {
System.out.print("WHAT ACCELERATION (FT/SEC/SEC) ");
return scanner.nextFloat();
}
return chooseRandomAcceleration();
}
private JumpResult executeJump(InitialJumpConditions initial, float chuteOpenTime) {
JumpResult jump = new JumpResult(initial.getAltitude());
for (float time = 0.0f; !jump.isSplat() && (time < chuteOpenTime); time += chuteOpenTime / 8) {
if (!jump.hasReachedTerminalVelocity() && time > initial.getTimeOfTerminalAccelerationReached()) {
jump.setReachedTerminalVelocity();
System.out.printf("TERMINAL VELOCITY REACHED AT T PLUS %f SECONDS.\n", initial.getTimeOfTerminalAccelerationReached());
}
float newDistance = computeDistance(initial, time, jump.hasReachedTerminalVelocity());
jump.setDistance(newDistance);
if (jump.isSplat()) {
return jump;
}
System.out.printf("%10.2f %f\n", time, jump.getDistance());
}
return jump;
}
private float computeDistance(InitialJumpConditions initial, float i, boolean hasReachedTerminalVelocity) {
final float V = initial.getTerminalVelocity();
final float A = initial.getAcceleration();
if (hasReachedTerminalVelocity) {
return initial.getAltitude() - ((V * V / (2 * A)) + (V * (i - (V / A))));
}
return initial.getAltitude() - ((A / 2) * i * i);
}
private void showJumpResults(InitialJumpConditions initial, JumpResult jump) {
if (jump.isSplat()) {
showSplatMessage(initial, jump);
@@ -85,6 +163,9 @@ public class Splat {
System.out.printf("%10.2f SPLAT\n", timeOfSplat);
}
/**
* Returns the number of jumps for which this jump was better
*/
private double computeTimeOfSplat(InitialJumpConditions initial, JumpResult jump) {
final float V = initial.getTerminalVelocity();
final float A = initial.getAcceleration();
@@ -94,47 +175,12 @@ public class Splat {
return Math.sqrt(2 * initial.getAltitude() / A);
}
// Returns the number of jumps for which this jump was better
private int countWorseHistoricalJumps(JumpResult jump) {
return (int) pastSuccessfulJumpDistances.stream()
.filter(distance -> jump.getDistance() < distance)
.count();
}
private JumpResult executeJump(InitialJumpConditions initial, float chuteOpenTime) {
JumpResult jump = new JumpResult(initial.getAltitude());
for (float time = 0.0f; !jump.isSplat() && (time < chuteOpenTime); time += chuteOpenTime / 8) {
if (!jump.hasReachedTerminalVelocity() && time > initial.getTimeOfTerminalAccelerationReached()) {
jump.setReachedTerminalVelocity();
System.out.printf("TERMINAL VELOCITY REACHED AT T PLUS %f SECONDS.\n", initial.getTimeOfTerminalAccelerationReached());
}
float newDistance = computeDistance(initial, time, jump.hasReachedTerminalVelocity());
jump.setDistance(newDistance);
if (jump.isSplat()) {
return jump;
}
System.out.printf("%10.2f %f\n", time, jump.getDistance());
}
return jump;
}
private float computeDistance(InitialJumpConditions initial, float i, boolean hasReachedTerminalVelocity) {
final float V = initial.getTerminalVelocity();
final float A = initial.getAcceleration();
if(hasReachedTerminalVelocity) {
return initial.getAltitude() - ((V * V / (2 * A)) + (V * (i - (V / A))));
}
return initial.getAltitude() - ((A / 2) * i * i);
}
private boolean playAgain() {
if (askYesNo("DO YOU WANT TO PLAY AGAIN ")) {
return true;
}
return askYesNo("PLEASE");
}
private void showCleverSplatMessage() {
List<String> messages = Arrays.asList(
"REQUIESCAT IN PACE.",
@@ -151,52 +197,28 @@ public class Splat {
System.out.println(messages.get(random.nextInt(10)));
}
private InitialJumpConditions buildInitialConditions() {
System.out.print("\n\n");
float terminalVelocity = promptTerminalVelocity();
float acceleration = promptGravitationalAcceleration();
return InitialJumpConditions.create(terminalVelocity, acceleration);
private boolean playAgain() {
if (askYesNo("DO YOU WANT TO PLAY AGAIN ")) {
return true;
}
return askYesNo("PLEASE");
}
private void showIntroduction() {
System.out.printf("%33s%s\n", " ", "SPLAT");
System.out.printf("%15s%s\n", " ", "CREATIVE COMPUTING MORRISTOWN, NEW JERSEY");
System.out.print("\n\n\n");
System.out.println("WELCOME TO 'SPLAT' -- THE GAME THAT SIMULATES A PARACHUTE");
System.out.println("JUMP. TRY TO OPEN YOUR CHUTE AT THE LAST POSSIBLE");
System.out.println("MOMENT WITHOUT GOING SPLAT.");
}
private float promptTerminalVelocity() {
if(askYesNo("SELECT YOUR OWN TERMINAL VELOCITY")){
System.out.print("WHAT TERMINAL VELOCITY (MI/HR) ");
return mphToFeetPerSec(scanner.nextFloat());
}
float terminalVelocity = (int) (1000 * random.nextFloat());
System.out.printf("OK. TERMINAL VELOCITY = %.2f MI/HR\n", terminalVelocity);
return mphToFeetPerSec(terminalVelocity);
}
private float promptGravitationalAcceleration() {
if(askYesNo("WANT TO SELECT ACCELERATION DUE TO GRAVITY")){
System.out.print("WHAT ACCELERATION (FT/SEC/SEC) ");
return scanner.nextFloat();
}
return chooseRandomAcceleration();
}
private float mphToFeetPerSec(float speed){
private float mphToFeetPerSec(float speed) {
return speed * (5280.0f / 3600.0f);
}
private boolean askYesNo(String prompt){
private boolean askYesNo(String prompt) {
System.out.printf("%s (YES OR NO) ", prompt);
while (true) {
String answer = scanner.next();
switch(answer){
case "YES": return true;
case "NO": return false;
default: System.out.print("YES OR NO ");
switch (answer) {
case "YES":
return true;
case "NO":
return false;
default:
System.out.print("YES OR NO ");
}
}
}
@@ -228,7 +250,7 @@ public class Splat {
this.acceleration = acceleration;
}
static Planet pickRandom(){
static Planet pickRandom() {
return values()[random.nextInt(Planet.values().length)];
}
@@ -262,11 +284,11 @@ public class Splat {
return distance;
}
void setDistance(float distance){
void setDistance(float distance) {
this.distance = distance;
}
void setReachedTerminalVelocity(){
void setReachedTerminalVelocity() {
reachedTerminalVelocity = true;
}
}
@@ -319,7 +341,7 @@ public class Splat {
return altitude;
}
float getTimeOfTerminalAccelerationReached(){
float getTimeOfTerminalAccelerationReached() {
return terminalVelocity / acceleration;
}
}