" # Darts # Description Calculate the points scored in a single toss of a Darts game. [Darts][darts] is a game where players throw darts at a [target][darts-target]. In our particular instance of the game, the target rewards 4 different amounts of points, depending on where the dart lands: ![Our dart scoreboard with values from a complete miss to a bullseye](https://assets.exercism.org/images/exercises/darts/darts-scoreboard.svg) - If the dart lands outside the target, player earns no points (0 points). - If the dart lands in the outer circle of the target, player earns 1 point. - If the dart lands in the middle circle of the target, player earns 5 points. - If the dart lands in the inner circle of the target, player earns 10 points. The outer circle has a radius of 10 units (this is equivalent to the total radius for the entire target), the middle circle a radius of 5 units, and the inner circle a radius of 1. Of course, they are all centered at the same point — that is, the circles are [concentric][] defined by the coordinates (0, 0). Given a point in the target (defined by its [Cartesian coordinates][cartesian-coordinates] `x` and `y`, where `x` and `y` are [real][real-numbers]), calculate the correct score earned by a dart landing at that point. ## Credit The scoreboard image was created by [habere-et-dispertire][habere-et-dispertire] using [Inkscape][inkscape]. [darts]: https://en.wikipedia.org/wiki/Darts [darts-target]: https://en.wikipedia.org/wiki/Darts#/media/File:Darts_in_a_dartboard.jpg [concentric]: https://mathworld.wolfram.com/ConcentricCircles.html [cartesian-coordinates]: https://www.mathsisfun.com/data/cartesian-coordinates.html [real-numbers]: https://www.mathsisfun.com/numbers/real-numbers.html [habere-et-dispertire]: https://exercism.org/profiles/habere-et-dispertire [inkscape]: https://en.wikipedia.org/wiki/Inkscape ## Hint The Pythagorean theorum will help. " Class { #name : 'DartsTest', #superclass : 'ExercismTest', #instVars : [ 'darts' ], #category : 'Exercise@Darts', #package : 'Exercise@Darts' } { #category : 'config' } DartsTest class >> exercise [ "Answer the configured exercise meta data for this exercise, an ExercismExercise" ^ (ExercismExercise for: self) difficulty: 2; topics: #('conditionals' 'math'); yourself ] { #category : 'config' } DartsTest class >> uuid [ "Answer a unique id for this exercise" ^'a0df4a77-8720-4e1a-ac52-8060f1425a2b' ] { #category : 'config' } DartsTest class >> version [ "Generated from specification: 14 April 2019" ^'1.2.1' ] { #category : 'running' } DartsTest >> setUp [ super setUp. darts := Darts new ] { #category : 'tests' } DartsTest >> test01_MissedTarget [ "Tip: Remember to review the class [Comment] tab" | result | result := darts scoreX: -9 y: 9 . self assert: result equals: 0 ] { #category : 'tests' } DartsTest >> test02_OnTheOuterCircle [ | result | result := darts scoreX: 0 y: 10 . self assert: result equals: 1 ] { #category : 'tests' } DartsTest >> test03_OnTheMiddleCircle [ | result | result := darts scoreX: -5 y: 0 . self assert: result equals: 5 ] { #category : 'tests' } DartsTest >> test04_OnTheInnerCircle [ | result | result := darts scoreX: 0 y: -1 . self assert: result equals: 10 ] { #category : 'tests' } DartsTest >> test05_ExactlyOnCenter [ | result | result := darts scoreX: 0 y: 0 . self assert: result equals: 10 ] { #category : 'tests' } DartsTest >> test06_NearTheCenter [ | result | result := darts scoreX: -0.1 y: -0.1 . self assert: result equals: 10 ] { #category : 'tests' } DartsTest >> test07_JustWithinTheInnerCircle [ | result | result := darts scoreX: 0.7 y: 0.7 . self assert: result equals: 10 ] { #category : 'tests' } DartsTest >> test08_JustOutsideTheInnerCircle [ | result | result := darts scoreX: 0.8 y: -0.8 . self assert: result equals: 5 ] { #category : 'tests' } DartsTest >> test09_JustWithinTheMiddleCircle [ | result | result := darts scoreX: -3.5 y: 3.5 . self assert: result equals: 5 ] { #category : 'tests' } DartsTest >> test10_JustOutsideTheMiddleCircle [ | result | result := darts scoreX: -3.6 y: -3.6 . self assert: result equals: 1 ] { #category : 'tests' } DartsTest >> test11_JustWithinTheOuterCircle [ | result | result := darts scoreX: -7.0 y: 7.0 . self assert: result equals: 1 ] { #category : 'tests' } DartsTest >> test12_JustOutsideTheOuterCircle [ | result | result := darts scoreX: 7.1 y: -7.1 . self assert: result equals: 0 ] { #category : 'tests' } DartsTest >> test13_AsymmetricPositionBetweenTheInnerAndMiddleCircles [ | result | result := darts scoreX: 0.5 y: -4 . self assert: result equals: 5 ]