gopatterns/pkg/point/between_point_test.go

package point_test

import (
	"math"
	"testing"

	"git.wtrh.nl/patterns/gopatterns/pkg/point"
	"git.wtrh.nl/patterns/gopatterns/pkg/position"
	"git.wtrh.nl/patterns/gopatterns/pkg/position/testutil"
	"git.wtrh.nl/patterns/gopatterns/pkg/vector"
	"github.com/tdewolff/canvas"
)

func TestBetweenPoint_Position(t *testing.T) {
	p1 := point.NewAbsolutePoint(0, 0, 0, "1")
	p2 := point.NewAbsolutePoint(1, 1, 0, "2")
	p3 := point.NewBetweenPoint(p1, p2, 0.5, "3")
	testutil.EqualPosition(t, position.Position{
		Vector: vector.Vector{
			X: 0.5,
			Y: 0.5,
		},
		Rotation: -math.Pi / 4,
	}, p3.Position(), 1e-10)

	matrix := p3.Matrix()
	EqualMatrix(t, canvas.Matrix{
		{math.Cos(-math.Pi / 4), -math.Sin(-math.Pi / 4), 0.5},
		{math.Sin(-math.Pi / 4), math.Cos(-math.Pi / 4), 0.5},
	}, matrix, 1e-10)

	p4 := point.NewAbsolutePoint(0, 1, 0, "4")
	p5 := point.NewBetweenPoint(p3, p4, 0.5, "5")

	testutil.EqualPosition(t, position.Position{
		Vector: vector.Vector{
			X: 0.25,
			Y: 0.75,
		},
		Rotation: math.Pi / 4,
	}, p5.Position(), 1e-10)

	matrix2 := p5.Matrix()
	EqualMatrix(t, canvas.Matrix{
		{math.Cos(math.Pi / 4), -math.Sin(math.Pi / 4), 0.25},
		{math.Sin(math.Pi / 4), math.Cos(math.Pi / 4), 0.75},
	}, matrix2, 1e-10)
}