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CGVectorTests.m
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//
// CGVectorTests.m
// SMG
//
// Created by Sam Green on 3/25/14.
// Copyright (c) 2014 Sam Green. All rights reserved.
//
@import XCTest;
@interface CGVectorTests : XCTestCase
@end
@implementation CGVectorTests
- (void)testSum {
CGVector v1 = CGVectorMake(1, 2);
CGVector v2 = CGVectorMake(2, 3);
CGVector result = CGVectorSum(v1, v2);
XCTAssertEqualWithAccuracy(result.dx, 3, FLT_EPSILON);
XCTAssertEqualWithAccuracy(result.dy, 5, FLT_EPSILON);
}
- (void)testDifference {
CGVector v1 = CGVectorMake(5, 5);
CGVector v2 = CGVectorMake(1, 2);
CGVector result = CGVectorDifference(v1, v2);
XCTAssertEqualWithAccuracy(result.dx, 4, FLT_EPSILON);
XCTAssertEqualWithAccuracy(result.dy, 3, FLT_EPSILON);
}
- (void)testMultiply {
CGVector v1 = CGVectorMake(1, 2);
CGVector v2 = CGVectorMake(2, 3);
CGVector result = CGVectorMultiply(v1, v2);
XCTAssertEqualWithAccuracy(result.dx, 2, FLT_EPSILON);
XCTAssertEqualWithAccuracy(result.dy, 6, FLT_EPSILON);
}
- (void)testMultiplyByScalar {
CGVector v1 = CGVectorMake(1, 2);
CGVector result = CGVectorMultiplyByScalar(v1, 3);
XCTAssertEqualWithAccuracy(result.dx, 3, FLT_EPSILON);
XCTAssertEqualWithAccuracy(result.dy, 6, FLT_EPSILON);
}
- (void)testMakePerpendicular {
CGVector v1 = CGVectorMake(0, 1);
CGVector result = CGVectorMakePerpendicular(v1);
XCTAssertEqualWithAccuracy(result.dx, 1, FLT_EPSILON);
XCTAssertEqualWithAccuracy(result.dy, 0, FLT_EPSILON);
}
- (void)testAngleBetween {
CGVector v1 = CGVectorMake(1, 0);
CGVector v2 = CGVectorMake(0, 1);
CGFloat result = CGVectorAngleBetween(v1, v2);
XCTAssertEqualWithAccuracy(result, M_PI_2, FLT_EPSILON);
}
- (void)testAngle {
CGVector v1 = CGVectorMake(1, 1);
CGFloat result = CGVectorAngle(v1);
XCTAssertEqualWithAccuracy(result, M_PI_4, FLT_EPSILON);
}
- (void)testDotProduct {
// X·Y = 0 if X is perpendicular to Y.
{
CGVector v1 = CGVectorMake(0, 1);
CGVector v2 = CGVectorMake(1, 0);
CGFloat result = CGVectorDotProduct(v1, v2);
XCTAssertEqualWithAccuracy(result, 0, FLT_EPSILON);
}
{
CGVector v1 = CGVectorMake(1, 1);
CGVector v2 = CGVectorMake(1, 0);
CGFloat result = CGVectorDotProduct(v1, v2);
XCTAssertEqualWithAccuracy(result, 1, FLT_EPSILON);
}
{
CGVector v1 = CGVectorMake(0, -1);
CGVector v2 = CGVectorMake(0, 1);
CGFloat result = CGVectorDotProduct(v1, v2);
XCTAssertEqualWithAccuracy(result, -1, FLT_EPSILON);
}
}
- (void)testMagnitude {
CGVector v1 = CGVectorMake(1, 1);
CGFloat result = CGVectorMagnitude(v1);
static const CGFloat kSquareRootOfTwo = 1.4142f;
XCTAssertEqualWithAccuracy(result, kSquareRootOfTwo, 0.0001f);
}
- (void)testNormalize {
CGVector v1 = CGVectorMake(3, 3);
CGVector result = CGVectorNormalize(v1);
static const CGFloat kLengthOfDiagonal = 0.7071f;
XCTAssertEqualWithAccuracy(result.dx, kLengthOfDiagonal, 0.0001f);
XCTAssertEqualWithAccuracy(result.dy, kLengthOfDiagonal, 0.0001f);
}
- (void)testEquality {
CGVector v1 = CGVectorMake(1, 1);
CGVector v2 = CGVectorMake(1, 1);
BOOL result = CGVectorEqualToVector(v1, v2);
XCTAssertTrue(result);
}
- (void)testPerpendicularEquality {
CGVector v1 = CGVectorMake(0, 1);
CGVector v2 = CGVectorMake(1, 0);
BOOL result = CGVectorPerpendicularToVector(v1, v2);
XCTAssertTrue(result);
}
@end