tile38/geojson/poly/inside_test.go

package poly

import "testing"

func testRayInside(t *testing.T, p Point, ps []Point, expect bool) {
	res := insideshpext(p, ps, true)
	if res != expect {
		t.Fatalf("{%v,%v} = %t, expect %t", p.X, p.Y, res, expect)
	}
}

func TestRayInside(t *testing.T) {
	strange := []Point{P(0, 0), P(0, 3), P(4, -3), P(4, 0), P(0, 0)}

	// on the edge
	testRayInside(t, P(0, 0), strange, true)
	testRayInside(t, P(0, 3), strange, true)

	testRayInside(t, P(4, -3), strange, true)
	testRayInside(t, P(4, -2), strange, true)
	testRayInside(t, P(3, 0), strange, true)
	testRayInside(t, P(1, 0), strange, true)

	// ouside by just a tad
	testRayInside(t, P(-0.1, 0), strange, false)
	testRayInside(t, P(-0.1, -0.1), strange, false)
	testRayInside(t, P(0, 3.1), strange, false)
	testRayInside(t, P(0.1, 3.1), strange, false)
	testRayInside(t, P(-0.1, 3), strange, false)
	testRayInside(t, P(4, -3.1), strange, false)
	testRayInside(t, P(3.9, -3), strange, false)
	testRayInside(t, P(4.1, -2), strange, false)
	testRayInside(t, P(3, 0.1), strange, false)
	testRayInside(t, P(1, -0.1), strange, false)
}

var texterior = Polygon{
	P(0, 0),
	P(0, 6),
	P(12, -6),
	P(12, 0),
	P(0, 0),
}
var tholeA = Polygon{
	P(1, 1),
	P(1, 2),
	P(2, 2),
	P(2, 1),
}
var tholeB = Polygon{
	P(11, -1),
	P(11, -3),
	P(9, -1),
}
var tholes = []Polygon{tholeA, tholeB}

func TestRayExteriorHoles(t *testing.T) {

	type point struct {
		p  Point
		ok bool
	}

	points := []point{
		{P(.5, 3), true},
		{P(11.5, -4.5), true},
		{P(6, 0), true},

		{P(3.5, .5), true},
		{P(1.5, 1.5), false},
		{P(10.5, -1.5), false},
		{P(-2, 0), false},
		{P(0, -2), false},
		{P(8, -3), false},
		{P(8, 1), false},
		{P(14, -1), false},
	}
	// add the edges, all should be inside
	for i := 0; i < len(texterior); i++ {
		points = append(points, point{texterior[i], true})
	}
	for i := 0; i < len(tholeA); i++ {
		points = append(points, point{tholeA[i], true})
	}
	for i := 0; i < len(tholeB); i++ {
		points = append(points, point{tholeB[i], true})
	}

	for i := 0; i < len(points); i++ {
		ok := points[i].p.Inside(texterior, tholes)
		if ok != points[i].ok {
			t.Fatalf("{%v,%v} = %t, expect %t", points[i].p.X, points[i].p.Y, ok, points[i].ok)
		}
	}
}

func TestInsideShapes(t *testing.T) {
	if texterior.Inside(texterior, nil) == false {
		t.Fatalf("expect true, got false")
	}
	if texterior.Inside(texterior, tholes) == true {
		t.Fatalf("expect false, got true")
	}
	if tholeA.Inside(texterior, nil) == false {
		t.Fatalf("expect true, got false")
	}
	if tholeB.Inside(texterior, nil) == false {
		t.Fatalf("expect true, got false")
	}
	if tholeA.Inside(tholeB, nil) == true {
		t.Fatalf("expect false, got true")
	}
}