Waypoint radius and acceptance in Drone Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the waypoint acceptance radius to 5 meters.

Drone Programming

drone.set_waypoint_radius([1])

Drag options to blanks, or click blank then click option'

A10

B5

C0

D15

Attempts:

3 left

💡 Hint

Common Mistakes

Using zero as radius means no acceptance area.

Using too large a radius may cause early waypoint acceptance.

The waypoint acceptance radius is set to 5 meters by passing 5 as the argument.

2fill in blank

medium

Complete the code to check if the drone is within the acceptance radius.

Drone Programming

if drone.distance_to_waypoint() [1] drone.waypoint_radius():
    print('Waypoint reached')

Drag options to blanks, or click blank then click option'

A<=

B==

C>

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using > instead of <= causes wrong logic.

Using == may fail due to floating point precision.

The drone is considered to have reached the waypoint if its distance is less than or equal to the acceptance radius.

3fill in blank

hard

Fix the error in the code to correctly update the acceptance radius.

Drone Programming

drone.waypoint_radius = [1]

Drag options to blanks, or click blank then click option'

Adrone.waypoint_radius(10)

Bdrone.set_waypoint_radius(10)

C10

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Calling setter methods instead of assigning value.

Using incorrect method names.

Assigning 10 directly to the property updates the radius correctly.

4fill in blank

hard

Fill both blanks to create a dictionary of waypoints with their acceptance radius if the radius is greater than 3.

Drone Programming

accepted_waypoints = {wp: [1] for wp in waypoints if wp.radius [2] 3}

Drag options to blanks, or click blank then click option'

Awp.radius

B>

C<

Dwp.position

Attempts:

3 left

💡 Hint

Common Mistakes

Using position instead of radius as value.

Using less than operator instead of greater than.

The dictionary comprehension includes waypoints with radius greater than 3 and maps each waypoint to its radius.

5fill in blank

hard

Fill all three blanks to filter waypoints with radius less than 5 and create a dictionary with waypoint names in uppercase as keys and their radius as values.

Drone Programming

filtered = [1]: [2] for wp in waypoints if wp.radius [3] 5}

Drag options to blanks, or click blank then click option'

Awp.name.upper()

Bwp.radius

C<

Dwp.name

Attempts:

3 left

💡 Hint

Common Mistakes

Using original names instead of uppercase.

Using greater than operator instead of less than.

The dictionary comprehension uses uppercase waypoint names as keys, radius as values, and filters waypoints with radius less than 5.

Practice

1. What does the waypoint radius define in drone programming?

easy

A. The distance within which the drone considers it has reached a waypoint

B. The maximum speed the drone can fly between waypoints

C. The height at which the drone must fly over a waypoint

D. The time the drone must wait at each waypoint

Solution

1. Step 1: Understand the waypoint radius concept

   The waypoint radius is the area around a waypoint that the drone must enter to consider it reached.

2. Step 2: Match the definition to options

   The distance within which the drone considers it has reached a waypoint correctly describes this as the distance within which the drone accepts the waypoint as reached.

3. Final Answer:

   The distance within which the drone considers it has reached a waypoint -> Option A

4. Quick Check:

   Waypoint radius = acceptance distance [OK]

Hint: Waypoint radius means how close drone must get to accept point [OK]

Common Mistakes:

• Confusing radius with speed or height
• Thinking drone must stop exactly on the point
• Mixing radius with waiting time

2. Which of the following is the correct way to set a waypoint radius of 5 meters in a drone mission script?

easy

A. mission.waypointRadius = '5m'

B. mission.radiusWaypoint = 5

C. setRadius(waypoint=5)

D. mission.setWaypointRadius(5)

Solution

1. Step 1: Identify correct method syntax

   The common method to set waypoint radius is using a function like setWaypointRadius(value).

2. Step 2: Compare options

   mission.setWaypointRadius(5) uses mission.setWaypointRadius(5), which is a clear and correct syntax. Other options use incorrect property names or wrong formats.

3. Final Answer:

   mission.setWaypointRadius(5) -> Option D

4. Quick Check:

   Method call with numeric radius = correct syntax [OK]

Hint: Look for method call with numeric argument for radius [OK]

Common Mistakes:

• Using string instead of number for radius
• Incorrect property names
• Missing parentheses for method call

3. Given the code snippet:

drone.setWaypointRadius(3)
drone.moveTo(10, 10)
print(drone.hasReachedWaypoint())

If the drone is currently at (12, 12), what will be the output?

medium

A. False

B. True

C. Error

D. None

Solution

1. Step 1: Calculate distance from drone to waypoint

   The drone is at (12,12) and waypoint at (10,10). Distance = sqrt((12-10)^2 + (12-10)^2) = sqrt(4+4) = sqrt(8) ≈ 2.83 meters.

2. Step 2: Compare distance with waypoint radius

   The radius is set to 3 meters. Since 2.83 < 3, the drone is inside the radius and should have reached the waypoint.

3. Step 3: Check output of hasReachedWaypoint()

   Since the drone is inside the radius, hasReachedWaypoint() returns True.

4. Final Answer:

   True -> Option B

5. Quick Check:

   Distance 2.83 < radius 3 means reached = True [OK]

Hint: Calculate distance and compare with radius to decide True/False [OK]

Common Mistakes:

• Calculating distance incorrectly
• Confusing inside/outside radius logic
• Assuming exact position match needed

4. Identify the error in this drone waypoint acceptance code:

drone.setWaypointRadius = 4
if drone.distanceToWaypoint() < drone.waypointRadius:
    drone.acceptWaypoint()

medium

A. Incorrect method call syntax for setting radius

B. Comparison operator should be > instead of <

C. Missing parentheses in acceptWaypoint call

D. Variable drone.waypointRadius is undefined

Solution

1. Step 1: Check how waypoint radius is set

   The code uses drone.setWaypointRadius = 4, which assigns a number to a method name, overwriting it.

2. Step 2: Identify correct syntax

   The radius should be set by calling the method: drone.setWaypointRadius(4), not by assignment.

3. Final Answer:

   Incorrect method call syntax for setting radius -> Option A

4. Quick Check:

   Method call needs parentheses, not assignment [OK]

Hint: Use parentheses to call methods, not assignment [OK]

Common Mistakes:

• Assigning value to method name instead of calling it
• Confusing < and > in distance check
• Forgetting parentheses on method calls

5. You want a drone to fly through 3 waypoints smoothly without stopping exactly on each. The waypoints are at (0,0), (10,0), and (10,10). You set the waypoint radius to 2 meters. Which statement best describes the drone's behavior?

hard

A. The drone will ignore the radius and stop only when exactly on the waypoint coordinates

B. The drone will stop exactly at each waypoint because radius only affects altitude

C. The drone will consider each waypoint reached when within 2 meters, allowing smooth flight without stopping exactly on points

D. The drone will fly in a straight line ignoring waypoints due to radius setting

Solution

1. Step 1: Understand waypoint radius effect on flight

   Setting a radius of 2 meters means the drone accepts reaching a waypoint once it is within 2 meters of it.

2. Step 2: Analyze drone behavior with radius

   This acceptance allows the drone to continue flying smoothly without stopping exactly on each waypoint, improving flight flow.

3. Step 3: Eliminate incorrect options

   The drone will stop exactly at each waypoint because radius only affects altitude is wrong because radius affects horizontal acceptance, not altitude only. The drone will ignore the radius and stop only when exactly on the waypoint coordinates ignores radius effect. The drone will fly in a straight line ignoring waypoints due to radius setting is incorrect as radius does not cause ignoring waypoints.

4. Final Answer:

   The drone will consider each waypoint reached when within 2 meters, allowing smooth flight without stopping exactly on points -> Option C

5. Quick Check:

   Radius acceptance enables smooth waypoint transitions [OK]

Hint: Radius lets drone accept waypoint nearby, no exact stop needed [OK]

Common Mistakes:

• Thinking radius affects altitude only
• Assuming drone must stop exactly on waypoint
• Believing radius causes ignoring waypoints