Release 1.0.0

.editorconfig

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+# EditorConfig is awesome: http://editorconfig.org
+root = true
+
+[*.cs]
+end_of_line = crlf
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+
+#Roslyn naming styles
+
+#PascalCase for public and protected members
+dotnet_naming_style.pascalcase.capitalization = pascal_case
+dotnet_naming_symbols.public_members.applicable_accessibilities = public,internal,protected,protected_internal,private_protected
+dotnet_naming_symbols.public_members.applicable_kinds = property,method,field,event
+dotnet_naming_rule.public_members_pascalcase.severity = error
+dotnet_naming_rule.public_members_pascalcase.symbols = public_members
+dotnet_naming_rule.public_members_pascalcase.style = pascalcase
+
+#camelCase for private members
+dotnet_naming_style.camelcase.capitalization = camel_case
+
+dotnet_naming_symbols.private_members.applicable_accessibilities = private
+dotnet_naming_symbols.private_members.applicable_kinds = property,method,field,event
+dotnet_naming_rule.private_members_camelcase.severity = warning
+dotnet_naming_rule.private_members_camelcase.symbols = private_members
+dotnet_naming_rule.private_members_camelcase.style = camelcase
+
+dotnet_naming_symbols.local_function.applicable_kinds = local_function
+dotnet_naming_rule.local_function_camelcase.severity = warning
+dotnet_naming_rule.local_function_camelcase.symbols = local_function
+dotnet_naming_rule.local_function_camelcase.style = camelcase
+
+#all_lower for private and local constants/static readonlys
+dotnet_naming_style.all_lower.capitalization = all_lower
+dotnet_naming_style.all_lower.word_separator = _
+
+dotnet_naming_symbols.private_constants.applicable_accessibilities = private
+dotnet_naming_symbols.private_constants.required_modifiers = const
+dotnet_naming_symbols.private_constants.applicable_kinds = field
+dotnet_naming_rule.private_const_all_lower.severity = warning
+dotnet_naming_rule.private_const_all_lower.symbols = private_constants
+dotnet_naming_rule.private_const_all_lower.style = all_lower
+
+dotnet_naming_symbols.private_static_readonly.applicable_accessibilities = private
+dotnet_naming_symbols.private_static_readonly.required_modifiers = static,readonly
+dotnet_naming_symbols.private_static_readonly.applicable_kinds = field
+dotnet_naming_rule.private_static_readonly_all_lower.severity = warning
+dotnet_naming_rule.private_static_readonly_all_lower.symbols = private_static_readonly
+dotnet_naming_rule.private_static_readonly_all_lower.style = all_lower
+
+dotnet_naming_symbols.local_constants.applicable_kinds = local
+dotnet_naming_symbols.local_constants.required_modifiers = const
+dotnet_naming_rule.local_const_all_lower.severity = warning
+dotnet_naming_rule.local_const_all_lower.symbols = local_constants
+dotnet_naming_rule.local_const_all_lower.style = all_lower
+
+#ALL_UPPER for non private constants/static readonlys
+dotnet_naming_style.all_upper.capitalization = all_upper
+dotnet_naming_style.all_upper.word_separator = _
+
+dotnet_naming_symbols.public_constants.applicable_accessibilities = public,internal,protected,protected_internal,private_protected
+dotnet_naming_symbols.public_constants.required_modifiers = const
+dotnet_naming_symbols.public_constants.applicable_kinds = field
+dotnet_naming_rule.public_const_all_upper.severity = warning
+dotnet_naming_rule.public_const_all_upper.symbols = public_constants
+dotnet_naming_rule.public_const_all_upper.style = all_upper
+
+dotnet_naming_symbols.public_static_readonly.applicable_accessibilities = public,internal,protected,protected_internal,private_protected
+dotnet_naming_symbols.public_static_readonly.required_modifiers = static,readonly
+dotnet_naming_symbols.public_static_readonly.applicable_kinds = field
+dotnet_naming_rule.public_static_readonly_all_upper.severity = warning
+dotnet_naming_rule.public_static_readonly_all_upper.symbols = public_static_readonly
+dotnet_naming_rule.public_static_readonly_all_upper.style = all_upper
+
+#Roslyn formating options
+
+#Formatting - indentation options
+csharp_indent_case_contents = true
+csharp_indent_case_contents_when_block = false
+csharp_indent_labels = one_less_than_current
+csharp_indent_switch_labels = true
+
+#Formatting - new line options
+csharp_new_line_before_catch = true
+csharp_new_line_before_else = true
+csharp_new_line_before_finally = true
+csharp_new_line_before_open_brace = all
+#csharp_new_line_before_members_in_anonymous_types = true
+#csharp_new_line_before_members_in_object_initializers = true # Currently no effect in VS/dotnet format (16.4), and makes Rider confusing
+csharp_new_line_between_query_expression_clauses = true
+
+#Formatting - organize using options
+dotnet_sort_system_directives_first = true
+
+#Formatting - spacing options
+csharp_space_after_cast = false
+csharp_space_after_colon_in_inheritance_clause = true
+csharp_space_after_keywords_in_control_flow_statements = true
+csharp_space_before_colon_in_inheritance_clause = true
+csharp_space_between_method_call_empty_parameter_list_parentheses = false
+csharp_space_between_method_call_name_and_opening_parenthesis = false
+csharp_space_between_method_call_parameter_list_parentheses = false
+csharp_space_between_method_declaration_empty_parameter_list_parentheses = false
+csharp_space_between_method_declaration_parameter_list_parentheses = false
+
+#Formatting - wrapping options
+csharp_preserve_single_line_blocks = true
+csharp_preserve_single_line_statements = true
+
+#Roslyn language styles
+
+#Style - this. qualification
+dotnet_style_qualification_for_field = false:warning
+dotnet_style_qualification_for_property = false:warning
+dotnet_style_qualification_for_method = false:warning
+dotnet_style_qualification_for_event = false:warning
+
+#Style - type names
+dotnet_style_predefined_type_for_locals_parameters_members = true:warning
+dotnet_style_predefined_type_for_member_access = true:warning
+csharp_style_var_when_type_is_apparent = true:none
+csharp_style_var_for_built_in_types = true:none
+csharp_style_var_elsewhere = true:silent
+
+#Style - modifiers
+dotnet_style_require_accessibility_modifiers = for_non_interface_members:warning
+csharp_preferred_modifier_order = public,private,protected,internal,new,abstract,virtual,sealed,override,static,readonly,extern,unsafe,volatile,async:warning
+
+#Style - parentheses
+# Skipped because roslyn cannot separate +-*/ with << >>
+
+#Style - expression bodies
+csharp_style_expression_bodied_accessors = true:warning
+csharp_style_expression_bodied_constructors = false:none
+csharp_style_expression_bodied_indexers = true:warning
+csharp_style_expression_bodied_methods = false:silent
+csharp_style_expression_bodied_operators = true:warning
+csharp_style_expression_bodied_properties = true:warning
+csharp_style_expression_bodied_local_functions = true:silent
+
+#Style - expression preferences
+dotnet_style_object_initializer = true:warning
+dotnet_style_collection_initializer = true:warning
+dotnet_style_prefer_inferred_anonymous_type_member_names = true:warning
+dotnet_style_prefer_auto_properties = true:warning
+dotnet_style_prefer_conditional_expression_over_assignment = true:silent
+dotnet_style_prefer_conditional_expression_over_return = true:silent
+dotnet_style_prefer_compound_assignment = true:warning
+
+#Style - null/type checks
+dotnet_style_coalesce_expression = true:warning
+dotnet_style_null_propagation = true:warning
+csharp_style_pattern_matching_over_is_with_cast_check = true:warning
+csharp_style_pattern_matching_over_as_with_null_check = true:warning
+csharp_style_throw_expression = true:silent
+csharp_style_conditional_delegate_call = true:warning
+
+#Style - unused
+dotnet_style_readonly_field = true:silent
+dotnet_code_quality_unused_parameters = non_public:silent
+csharp_style_unused_value_expression_statement_preference = discard_variable:silent
+csharp_style_unused_value_assignment_preference = discard_variable:warning
+
+#Style - variable declaration
+csharp_style_inlined_variable_declaration = true:warning
+csharp_style_deconstructed_variable_declaration = true:warning
+
+#Style - other C# 7.x features
+dotnet_style_prefer_inferred_tuple_names = true:warning
+csharp_prefer_simple_default_expression = true:warning
+csharp_style_pattern_local_over_anonymous_function = true:warning
+dotnet_style_prefer_is_null_check_over_reference_equality_method = true:silent
+
+#Style - C# 8 features
+csharp_prefer_static_local_function = true:warning
+csharp_prefer_simple_using_statement = true:silent
+csharp_style_prefer_index_operator = true:warning
+csharp_style_prefer_range_operator = true:warning
+csharp_style_prefer_switch_expression = false:none
+
+#Supressing roslyn built-in analyzers
+# Suppress: EC112
+
+#Private method is unused
+dotnet_diagnostic.IDE0051.severity = silent
+#Private member is unused
+dotnet_diagnostic.IDE0052.severity = silent
+
+#Rules for disposable
+dotnet_diagnostic.IDE0067.severity = none
+dotnet_diagnostic.IDE0068.severity = none
+dotnet_diagnostic.IDE0069.severity = none

Pettanko.Tests/CalculatorTests.cs

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+using Pettanko.Difficulty;
+using Pettanko.Performance;
+using Xunit;
+
+namespace Pettanko.Tests
+{
+    public class CalculatorTests
+    {
+        [Fact]
+        public void TestOsuCalculator()
+        {
+            var result = Pettanko.Calculate(
+                new OsuDifficultyAttributes
+                {
+                    AimDifficulty = 2.9864489908605893,
+                    SpeedDifficulty = 3.1111283473891254,
+                    FlashlightDifficulty = 3.54341969421949,
+                    SliderFactor = 0.99796469139376365,
+                    ApproachRate = 9.50,
+                    OverallDifficulty = 9.00,
+                    MaxCombo = 3220,
+                    HitCircleCount = 1534,
+                    SliderCount = 587,
+                    SpinnerCount = 5
+                }, 
+                new Score
+                {
+                    RulesetId = 0,
+                    Accuracy = 1.0,
+                    MaxCombo = 3220,
+                    Statistics = new Statistics
+                    {
+                        Count300 = 2126
+                    }
+                });
+
+            var osuPerfAttributes = result as OsuPerformanceAttributes;
+
+            Assert.NotNull(osuPerfAttributes);
+            Assert.Equal(455.90599187959032, osuPerfAttributes.Total);
+            Assert.Equal(141.45654132294621, osuPerfAttributes.Aim);
+            Assert.Equal(167.49667236961548, osuPerfAttributes.Speed);
+            Assert.Equal(140.70696717850745, osuPerfAttributes.Accuracy);
+            Assert.Equal(0.0000, osuPerfAttributes.Flashlight);
+            Assert.Equal(0.0000, osuPerfAttributes.EffectiveMissCount);
+        }
+    }
+}

Pettanko.Tests/Pettanko.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.5.0" />
+    <PackageReference Include="xunit" Version="2.4.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
+    <PackageReference Include="coverlet.collector" Version="1.2.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Pettanko\Pettanko.csproj" />
+  </ItemGroup>
+
+</Project>

Pettanko.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31912.275
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Pettanko", "Pettanko\Pettanko.csproj", "{A5154878-72F7-4E36-9FB7-25B5C9E2B884}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Pettanko.Tests", "Pettanko.Tests\Pettanko.Tests.csproj", "{1D2CD22C-6716-4707-8A6E-007F7D1A9FB4}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A5154878-72F7-4E36-9FB7-25B5C9E2B884}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A5154878-72F7-4E36-9FB7-25B5C9E2B884}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A5154878-72F7-4E36-9FB7-25B5C9E2B884}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A5154878-72F7-4E36-9FB7-25B5C9E2B884}.Release|Any CPU.Build.0 = Release|Any CPU
+		{1D2CD22C-6716-4707-8A6E-007F7D1A9FB4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1D2CD22C-6716-4707-8A6E-007F7D1A9FB4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1D2CD22C-6716-4707-8A6E-007F7D1A9FB4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1D2CD22C-6716-4707-8A6E-007F7D1A9FB4}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {73ADA6B4-4B6C-439B-89F6-49B0BC85CE5B}
+	EndGlobalSection
+EndGlobal

Pettanko/Calculators/CatchPerformanceCalculator.cs

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+// Copyright (c) ppy Pty Ltd <[email protected]>. Licensed under the MIT Licence.
+
+using System;
+using System.Linq;
+using Pettanko.Difficulty;
+using Pettanko.Mods;
+using Pettanko.Performance;
+
+namespace Pettanko.Calculators
+{
+    public class CatchPerformanceCalculator : IPerformanceCalculator
+    {
+        private int fruitsHit;
+        private int ticksHit;
+        private int tinyTicksHit;
+        private int tinyTicksMissed;
+        private int misses;
+
+        public PerformanceAttributes Calculate(DifficultyAttributes difficultyAttributes, Score scoreData)
+        {
+            var catchAttributes = (CatchDifficultyAttributes)difficultyAttributes;
+
+            fruitsHit = scoreData.Statistics.Count300;
+            ticksHit = scoreData.Statistics.Count100;
+            tinyTicksHit = scoreData.Statistics.Count50;
+            tinyTicksMissed = scoreData.Statistics.CountKatu;
+            misses = scoreData.Statistics.CountMiss;
+
+            // We are heavily relying on aim in catch the beat
+            double value = Math.Pow(5.0 * Math.Max(1.0, catchAttributes.StarRating / 0.0049) - 4.0, 2.0) / 100000.0;
+
+            // Longer maps are worth more. "Longer" means how many hits there are which can contribute to combo
+            int numTotalHits = totalComboHits();
+
+            double lengthBonus =
+                0.95 + 0.3 * Math.Min(1.0, numTotalHits / 2500.0) +
+                (numTotalHits > 2500 ? Math.Log10(numTotalHits / 2500.0) * 0.475 : 0.0);
+            value *= lengthBonus;
+
+            value *= Math.Pow(0.97, misses);
+
+            // Combo scaling
+            if (catchAttributes.MaxCombo > 0)
+                value *= Math.Min(Math.Pow(scoreData.MaxCombo, 0.8) / Math.Pow(catchAttributes.MaxCombo, 0.8), 1.0);
+
+            double approachRate = catchAttributes.ApproachRate;
+            double approachRateFactor = 1.0;
+            if (approachRate > 9.0)
+                approachRateFactor += 0.1 * (approachRate - 9.0); // 10% for each AR above 9
+            if (approachRate > 10.0)
+                approachRateFactor += 0.1 * (approachRate - 10.0); // Additional 10% at AR 11, 30% total
+            else if (approachRate < 8.0)
+                approachRateFactor += 0.025 * (8.0 - approachRate); // 2.5% for each AR below 8
+
+            value *= approachRateFactor;
+
+            if (scoreData.Mods.Any(m => m is ModHidden))
+            {
+                // Hiddens gives almost nothing on max approach rate, and more the lower it is
+                if (approachRate <= 10.0)
+                    value *= 1.05 + 0.075 * (10.0 - approachRate); // 7.5% for each AR below 10
+                else if (approachRate > 10.0)
+                    value *= 1.01 + 0.04 * (11.0 - Math.Min(11.0, approachRate)); // 5% at AR 10, 1% at AR 11
+            }
+
+            if (scoreData.Mods.Any(m => m is ModFlashlight))
+                value *= 1.35 * lengthBonus;
+
+            value *= Math.Pow(accuracy(), 5.5);
+
+            if (scoreData.Mods.Any(m => m is ModNoFail))
+                value *= 0.90;
+
+            return new CatchPerformanceAttributes
+            {
+                Total = value
+            };
+        }
+        private double accuracy() => totalHits() == 0 ? 0 : Extensions.Clamp((double)totalSuccessfulHits() / totalHits(), 0, 1);
+        private int totalHits() => tinyTicksHit + ticksHit + fruitsHit + misses + tinyTicksMissed;
+        private int totalSuccessfulHits() => tinyTicksHit + ticksHit + fruitsHit;
+        private int totalComboHits() => misses + ticksHit + fruitsHit;
+    }
+}

Pettanko/Calculators/IPerformanceCalculator.cs

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+using Pettanko.Difficulty;
+using Pettanko.Performance;
+
+namespace Pettanko.Calculators
+{
+    public interface IPerformanceCalculator
+    {
+        PerformanceAttributes Calculate(DifficultyAttributes difficultyAttributes, Score scoreData);
+    }
+}