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factor out initial jump conditions

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This commit is contained in:
jason
2022-01-04 22:05:24 -08:00
parent c3a1b621b9
commit eba6c07fd0
1 changed files with 74 additions and 20 deletions
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94
81_Splat/java/src/Splat.java
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@@ -3,7 +3,7 @@ import java.util.Random;
import java.util.Scanner;
public class Splat {
private final Random random = new Random();
private static final Random random = new Random();
private final Scanner scanner = new Scanner(System.in);
public static void main(String[] args) {
@@ -19,19 +19,15 @@ public class Splat {
int K1 = 0;
while (true) {
System.out.print("\n\n");
int D1 = (int) (9001.0f * random.nextFloat() + 1000);
float terminalVelocity = promptTerminalVelocity();
float V = terminalVelocity + ((terminalVelocity * random.nextFloat()) / 20.0f) - ((terminalVelocity * random.nextFloat()) / 20.0f);
float gravitationalAcceleration = promptGravitationalAcceleration();
float A = gravitationalAcceleration + ((gravitationalAcceleration * random.nextFloat()) / 20.0f) - ((gravitationalAcceleration * random.nextFloat()) / 20.0f);
InitialJumpConditions jump = buildInitialConditions();
final float V = jump.getTerminalVelocity();
final float A = jump.getGravitationalAcceleration();
System.out.println();
System.out.printf(" ALTITUDE = %d FT\n", D1);
System.out.printf(" TERM. VELOCITY = %.2f FT/SEC +/-5%%\n", terminalVelocity);
System.out.printf(" ACCELERATION = %.2f FT/SEC/SEC +/-5%%\n", gravitationalAcceleration);
System.out.printf(" ALTITUDE = %d FT\n", jump.getAltitude());
System.out.printf(" TERM. VELOCITY = %.2f FT/SEC +/-5%%\n", jump.getOriginalTerminalVelocity());
System.out.printf(" ACCELERATION = %.2f FT/SEC/SEC +/-5%%\n", jump.getOriginalGravitationalAcceleration());
System.out.println("SET THE TIMER FOR YOUR FREEFALL.");
System.out.print("HOW MANY SECONDS ");
float T = scanner.nextFloat();
@@ -42,12 +38,11 @@ public class Splat {
boolean terminalReached = false;
float D = 0.0f;
for (float i = 0.0f; !splat && (i < T); i += T / 8) {
if (i > (V / A)) {
if (i > jump.getTimeOfTerminalAccelerationReached()) {
terminalReached = true;
System.out.printf("TERMINAL VELOCITY REACHED AT T PLUS %f SECONDS.\n", (V / A));
System.out.printf("TERMINAL VELOCITY REACHED AT T PLUS %f SECONDS.\n", jump.getTimeOfTerminalAccelerationReached());
for (i = i; i < T; i += T / 8) {
D = D1 - ((V * V / (2 * A)) + (V * (i - (V / A))));
// System.out.printf(" ......................................tv %f\n", D);
D = jump.getAltitude() - ((V * V / (2 * A)) + (V * (i - (V / A))));
if (D <= 0) {
splat = true;
break;
@@ -56,8 +51,7 @@ public class Splat {
}
break;
}
D = D1 - ((A / 2) * i * i);
// System.out.printf(" ......................................debug %f\n", D);
D = jump.getAltitude() - ((A / 2) * i * i);
if (D <= 0) {
splat = true;
break;
@@ -123,9 +117,9 @@ public class Splat {
} else {
if (terminalReached) {
System.out.printf("%.2f SPLAT\n", (V / A) + ((D1 - (V * V / (2 * A))) / V));
System.out.printf("%.2f SPLAT\n", (V / A) + ((jump.getAltitude() - (V * V / (2 * A))) / V));
} else {
System.out.printf("%.2f SPLAT\n", Math.sqrt(2 * D1 / A));
System.out.printf("%.2f SPLAT\n", Math.sqrt(2 * jump.getAltitude() / A));
}
switch (random.nextInt(10)) {
@@ -192,6 +186,13 @@ public class Splat {
}
private InitialJumpConditions buildInitialConditions() {
System.out.print("\n\n");
float terminalVelocity = promptTerminalVelocity();
float gravitationalAcceleration = promptGravitationalAcceleration();
return InitialJumpConditions.create(terminalVelocity, gravitationalAcceleration);
}
private void showIntroduction() {
System.out.printf("%33s%s\n", " ", "SPLAT");
System.out.printf("%15s%s\n", " ", "CREATIVE COMPUTING MORRISTOWN, NEW JERSEY");
@@ -241,6 +242,59 @@ public class Splat {
return planet.getAcceleration();
}
static class InitialJumpConditions {
private final float originalTerminalVelocity;
private final float originalGravitationalAcceleration;
private final float terminalVelocity;
private final float gravitationalAcceleration;
private final int altitude;
private InitialJumpConditions(float originalTerminalVelocity, float originalGravitationalAcceleration,
float terminalVelocity, float gravitationalAcceleration, int altitude) {
this.originalTerminalVelocity = originalTerminalVelocity;
this.originalGravitationalAcceleration = originalGravitationalAcceleration;
this.terminalVelocity = terminalVelocity;
this.gravitationalAcceleration = gravitationalAcceleration;
this.altitude = altitude;
}
// Create initial jump conditions with adjusted velocity/acceleration and a random initial altitude
private static InitialJumpConditions create(float terminalVelocity, float gravitationalAcceleration) {
final int altitude = (int) (9001.0f * random.nextFloat() + 1000);
return new InitialJumpConditions(terminalVelocity, gravitationalAcceleration,
plusMinus5Percent(terminalVelocity), plusMinus5Percent(gravitationalAcceleration), altitude);
}
private static float plusMinus5Percent(float value) {
return value + ((value * random.nextFloat()) / 20.0f) - ((value * random.nextFloat()) / 20.0f);
}
public float getOriginalTerminalVelocity() {
return originalTerminalVelocity;
}
public float getOriginalGravitationalAcceleration() {
return originalGravitationalAcceleration;
}
public float getTerminalVelocity() {
return terminalVelocity;
}
public float getGravitationalAcceleration() {
return gravitationalAcceleration;
}
public int getAltitude() {
return altitude;
}
public float getTimeOfTerminalAccelerationReached(){
return terminalVelocity / gravitationalAcceleration;
}
}
enum Planet {
MERCURY("FINE. YOU'RE ON MERCURY", 12.2f),
VENUS("ALL RIGHT. YOU'RE ON VENUS", 28.3f),