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factor out JumpResult and executeJump()

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jason
2022-01-04 22:53:32 -08:00
parent 42f57024fe
commit 347558b966
1 changed files with 72 additions and 39 deletions
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111
81_Splat/java/src/Splat.java
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@@ -20,65 +20,41 @@ public class Splat {
int K1 = 0; int K1 = 0;
while (true) { while (true) {
InitialJumpConditions jump = buildInitialConditions(); InitialJumpConditions initial = buildInitialConditions();
System.out.println(); System.out.println();
System.out.printf(" ALTITUDE = %d FT\n", jump.getAltitude()); System.out.printf(" ALTITUDE = %d FT\n", initial.getAltitude());
System.out.printf(" TERM. VELOCITY = %.2f FT/SEC +/-5%%\n", jump.getOriginalTerminalVelocity()); System.out.printf(" TERM. VELOCITY = %.2f FT/SEC +/-5%%\n", initial.getOriginalTerminalVelocity());
System.out.printf(" ACCELERATION = %.2f FT/SEC/SEC +/-5%%\n", jump.getOriginalAcceleration()); System.out.printf(" ACCELERATION = %.2f FT/SEC/SEC +/-5%%\n", initial.getOriginalAcceleration());
System.out.println("SET THE TIMER FOR YOUR FREEFALL."); System.out.println("SET THE TIMER FOR YOUR FREEFALL.");
System.out.print("HOW MANY SECONDS "); System.out.print("HOW MANY SECONDS ");
float T = scanner.nextFloat(); float freefallTime = scanner.nextFloat();
System.out.println("HERE WE GO.\n"); System.out.println("HERE WE GO.\n");
System.out.println("TIME (SEC) DIST TO FALL (FT)"); System.out.println("TIME (SEC) DIST TO FALL (FT)");
System.out.println("========== ================="); System.out.println("========== =================");
final float V = jump.getTerminalVelocity(); final float V = initial.getTerminalVelocity();
final float A = jump.getAcceleration(); final float A = initial.getAcceleration();
boolean splat = false; JumpResult jump = executeJump(initial, freefallTime);
boolean terminalReached = false;
float D = 0.0f;
for (float i = 0.0f; !splat && (i < T); i += T / 8) {
if (i > jump.getTimeOfTerminalAccelerationReached()) {
terminalReached = true;
System.out.printf("TERMINAL VELOCITY REACHED AT T PLUS %f SECONDS.\n", jump.getTimeOfTerminalAccelerationReached());
for (i = i; i < T; i += T / 8) {
D = jump.getAltitude() - ((V * V / (2 * A)) + (V * (i - (V / A))));
if (D <= 0) {
splat = true;
break;
}
System.out.printf("%10.2f %f\n", i, D);
}
break;
}
D = jump.getAltitude() - ((A / 2) * i * i);
if (D <= 0) {
splat = true;
break;
}
System.out.printf("%10.2f %f\n", i, D);
}
if (splat) { if (jump.isSplat()) {
if (terminalReached) { if (jump.hasReachedTerminalVelocity()) {
System.out.printf("%.2f SPLAT\n", (V / A) + ((jump.getAltitude() - (V * V / (2 * A))) / V)); System.out.printf("%.2f SPLAT\n", (V / A) + ((initial.getAltitude() - (V * V / (2 * A))) / V));
} else { } else {
System.out.printf("%.2f SPLAT\n", Math.sqrt(2 * jump.getAltitude() / A)); System.out.printf("%.2f SPLAT\n", Math.sqrt(2 * initial.getAltitude() / A));
} }
showRandomSplatMessage(); showRandomSplatMessage();
} else { } else {
System.out.println("CHUTE OPEN"); System.out.println("CHUTE OPEN");
int J = 0; int J = 0;
for (J = 0; J < 42; J++) { for (J = 0; J < 42; J++) {
if (Arr[J] == 0) { if (Arr[J] == 0) {
Arr[J] = D; Arr[J] = jump.getDistance();
break; break;
} }
K = K + 1; K = K + 1;
if (D > Arr[J]) { if (jump.getDistance() > Arr[J]) {
continue; continue;
} }
K1 = K1 + 1; K1 = K1 + 1;
@@ -98,7 +74,7 @@ public class Splat {
System.out.printf("YOU WERE BEATEN OUT BY %d OF THEM.\n", K - K1); System.out.printf("YOU WERE BEATEN OUT BY %d OF THEM.\n", K - K1);
} else if (K - K1 <= 0.75 * K) { } else if (K - K1 <= 0.75 * K) {
System.out.printf("CONSERVATIVE, AREN'T YOU? YOU RANKED ONLY %d IN THE\n", K - K1); System.out.printf("CONSERVATIVE, AREN'T YOU? YOU RANKED ONLY %d IN THE\n", K - K1);
System.out.printf("%d SUCCESSFUL JUMPS BEFORE YOURS.", K); System.out.printf("%d SUCCESSFUL JUMPS BEFORE YOURS.\n", K);
} else if (K - K1 <= -0.9 * K) { } else if (K - K1 <= -0.9 * K) {
System.out.println("HUMPH! DON'T YOU HAVE ANY SPORTING BLOOD? THERE WERE"); System.out.println("HUMPH! DON'T YOU HAVE ANY SPORTING BLOOD? THERE WERE");
System.out.printf("%d SUCCESSFUL JUMPS BEFORE YOURS AND YOU CAME IN %d JUMPS\n", K, K1); System.out.printf("%d SUCCESSFUL JUMPS BEFORE YOURS AND YOU CAME IN %d JUMPS\n", K, K1);
@@ -130,6 +106,33 @@ public class Splat {
} }
private JumpResult executeJump(InitialJumpConditions initial, float T) {
final float V = initial.getTerminalVelocity();
final float A = initial.getAcceleration();
JumpResult jump = new JumpResult(initial.getAltitude());
for (float i = 0.0f; !jump.isSplat() && (i < T); i += T / 8) {
if (i > initial.getTimeOfTerminalAccelerationReached()) {
jump.setReachedTerminalVelocity();
System.out.printf("TERMINAL VELOCITY REACHED AT T PLUS %f SECONDS.\n", initial.getTimeOfTerminalAccelerationReached());
for (i = i; i < T; i += T / 8) {
jump.setDistance(initial.getAltitude() - ((V * V / (2 * A)) + (V * (i - (V / A)))));
if (jump.isSplat()) {
break;
}
System.out.printf("%10.2f %f\n", i, jump.getDistance());
}
break;
}
jump.setDistance( initial.getAltitude() - ((A / 2) * i * i));
if (jump.isSplat()) {
break;
}
System.out.printf("%10.2f %f\n", i, jump.getDistance());
}
return jump;
}
private boolean playAgain() { private boolean playAgain() {
if (askYesNo("DO YOU WANT TO PLAY AGAIN ")) { if (askYesNo("DO YOU WANT TO PLAY AGAIN ")) {
return true; return true;
@@ -213,6 +216,36 @@ public class Splat {
return planet.getAcceleration(); return planet.getAcceleration();
} }
// Mutable
static class JumpResult {
private boolean reachedTerminalVelocity = false;
private float distance; // from the ground
public JumpResult(float distance) {
this.distance = distance;
}
public boolean isSplat() {
return distance <= 0;
}
public boolean hasReachedTerminalVelocity() {
return reachedTerminalVelocity;
}
public float getDistance() {
return distance;
}
public void setDistance(float distance){
this.distance = distance;
}
public void setReachedTerminalVelocity(){
reachedTerminalVelocity = true;
}
}
// Immutable // Immutable
static class InitialJumpConditions { static class InitialJumpConditions {
private final float originalTerminalVelocity; private final float originalTerminalVelocity;