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#include <iostream>
#include <mbgl/test/util.hpp>
#include <mbgl/style/function.hpp>
#include <mbgl/style/function_evaluator.hpp>
#include <mbgl/style/style_calculation_parameters.hpp>
using namespace mbgl;
TEST(Function, Constant) {
NormalFunctionEvaluator<float> evaluate;
EXPECT_EQ(2.0f, evaluate(Function<float>(2), StyleCalculationParameters(0)));
EXPECT_EQ(3.8f, evaluate(Function<float>(3.8), StyleCalculationParameters(0)));
EXPECT_EQ(22.0f, evaluate(Function<float>(22), StyleCalculationParameters(0)));
EXPECT_EQ(2.0f, evaluate(Function<float>(2), StyleCalculationParameters(4)));
EXPECT_EQ(3.8f, evaluate(Function<float>(3.8), StyleCalculationParameters(4)));
EXPECT_EQ(22.0f, evaluate(Function<float>(22), StyleCalculationParameters(4)));
EXPECT_EQ(2.0f, evaluate(Function<float>(2), StyleCalculationParameters(22)));
EXPECT_EQ(3.8f, evaluate(Function<float>(3.8), StyleCalculationParameters(22)));
EXPECT_EQ(22.0f, evaluate(Function<float>(22), StyleCalculationParameters(22)));
}
TEST(Function, Stops) {
NormalFunctionEvaluator<float> evaluate;
// Explicit constant slope in fringe regions.
Function<float> slope_1({ { 0, 1.5 }, { 6, 1.5 }, { 8, 3 }, { 22, 3 } }, 1.75);
EXPECT_EQ(1.5, evaluate(slope_1, StyleCalculationParameters(0)));
EXPECT_EQ(1.5, evaluate(slope_1, StyleCalculationParameters(4)));
EXPECT_EQ(1.5, evaluate(slope_1, StyleCalculationParameters(6)));
ASSERT_FLOAT_EQ(2.0454545454545454, evaluate(slope_1, StyleCalculationParameters(7)));
EXPECT_EQ(3.0, evaluate(slope_1, StyleCalculationParameters(8)));
EXPECT_EQ(3.0, evaluate(slope_1, StyleCalculationParameters(9)));
EXPECT_EQ(3.0, evaluate(slope_1, StyleCalculationParameters(15)));
EXPECT_EQ(3.0, evaluate(slope_1, StyleCalculationParameters(22)));
// Test constant values in fringe regions.
Function<float> slope_2({ { 6, 1.5 }, { 8, 3 } }, 1.75);
EXPECT_EQ(1.5, evaluate(slope_2, StyleCalculationParameters(0)));
EXPECT_EQ(1.5, evaluate(slope_2, StyleCalculationParameters(4)));
EXPECT_EQ(1.5, evaluate(slope_2, StyleCalculationParameters(6)));
ASSERT_FLOAT_EQ(2.0454545454545454, evaluate(slope_2, StyleCalculationParameters(7)));
EXPECT_EQ(3.0, evaluate(slope_2, StyleCalculationParameters(8)));
EXPECT_EQ(3.0, evaluate(slope_2, StyleCalculationParameters(9)));
EXPECT_EQ(3.0, evaluate(slope_2, StyleCalculationParameters(15)));
EXPECT_EQ(3.0, evaluate(slope_2, StyleCalculationParameters(22)));
// Test no values.
Function<float> slope_3({}, 1.75);
EXPECT_EQ(1, evaluate(slope_3, StyleCalculationParameters(2)));
EXPECT_EQ(1, evaluate(slope_3, StyleCalculationParameters(6)));
EXPECT_EQ(1, evaluate(slope_3, StyleCalculationParameters(12)));
// Explicit constant slope in fringe regions.
Function<float> slope_4({ { 0, 2 }, { 8, 10 } }, 1);
EXPECT_EQ(2, evaluate(slope_4, StyleCalculationParameters(0)));
EXPECT_EQ(3, evaluate(slope_4, StyleCalculationParameters(1)));
EXPECT_EQ(4, evaluate(slope_4, StyleCalculationParameters(2)));
EXPECT_EQ(4.75, evaluate(slope_4, StyleCalculationParameters(2.75)));
EXPECT_EQ(10, evaluate(slope_4, StyleCalculationParameters(8)));
}
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