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Racing turtles
Which turtle can reach the finish line first?
With multiple turtles and a random forward movement, a race can be simulated.
Make
Write a program that runs a race of up to 8 turtles moving up the screen 240 pixels from a starting position. Each turtle can move between 0-10 pixels in each turn. All the turtles will finish the race, but once a turtle has reached the finish line it will stop moving. The results of the race should be output.
Use this boilerplate code as a starting point:
Success Criteria
Remember to add a comment before a subprogram, condition or iteration to explain its purpose.
Extend the `main program` so that:
- A number of turtles equal to the constant `racing_turtles` are created. For each turtle it:
- Sets the pen colour using the equivalent `silk` constant. E.g. turtle 0 is red, turtle 1 is blue etc.
- Sets the pen size to be 3.
- Appends the new turtle to the list `t`.
- Appends the value 0 to the list `position`.
Complete the subprogram called `draw_finish_line` that:
- Creates a new turtle `referee` that moves up the screen to the `finish_line`.
- Draws a black horizontal line equal to the number of racing turtles multiplied by 50.
- Moves back to where it started drawing the line plus an additional 50 pixels. (This moves the referee to the left of the first racing turtle).
Complete the `main program` so that:
- The `draw_finish_line` subprogram is called.
- The `starters_orders` subprogram is called.
- The `race` subprogram is called.
Complete the subprogram called `starters_orders` that:
- Places each racing turtle 50 pixels apart (at the starting position).
- Each racing turtle is facing upwards.
Complete the subprogram called `race` that:
- Outputs the word, "Results:".
- Repeats until all the turtles have met or crossed the finish line.
- Moves each turtle forward a random number of pixels between 0 and the constant `speed` if it has not already finished the race.
- When a turtle reaches the finish line it's finishing position and colour are output. E.g. if green crossed the finish line first it would output, "1 : green".
Typical outputs from the program would be:
Results:
1 : salmon
2 : purple
3 : blue
4 : green
5 : red
6 : orange
Knowledge Organiser
Use these resources as a reference to help you meet the success criteria.
Programming guide:
Evaluate
Check that your program outputs the expected result and has met the success criteria.
Check that you have:
- Used comments within the code to describe the purpose of subprograms, conditions and iterations.
- Used meaningful identifier names. That means the names of subprograms and variables indicate what they are for.
