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area_test.go
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package geom
import "testing"
func TestArea(t *testing.T) {
tests := []struct {
test Polygonal
expected float64
}{
{
test: Polygon{{
Point{X: 0, Y: 0}, Point{X: 2, Y: 0},
Point{X: 2, Y: 2}, Point{X: 0, Y: 2},
Point{X: 0, Y: 0}}},
expected: 4.,
},
{ // backwards square.
test: Polygon{{
Point{X: 0, Y: 0}, Point{X: 0, Y: 2},
Point{X: 2, Y: 2}, Point{X: 2, Y: 0},
Point{X: 0, Y: 0}}},
expected: 4.,
},
{ // Square without closing point
test: Polygon{{
Point{X: 0, Y: 0}, Point{X: 0, Y: 2},
Point{X: 2, Y: 2}, Point{X: 2, Y: 0}}},
expected: 4.,
},
{ // Square with hole
test: Polygon{
{
Point{X: 0, Y: 0}, Point{X: 2, Y: 0},
Point{X: 2, Y: 2}, Point{X: 0, Y: 2},
Point{X: 0, Y: 0},
},
{
Point{X: 0.5, Y: 0.5}, Point{X: 0.5, Y: 1.5},
Point{X: 1.5, Y: 1.5}, Point{X: 1.5, Y: 0.5},
Point{X: 0.5, Y: 0.5},
},
},
expected: 3.,
},
{ // Square with backwards hole.
test: Polygon{
{
Point{X: 0, Y: 0}, Point{X: 2, Y: 0},
Point{X: 2, Y: 2}, Point{X: 0, Y: 2},
Point{X: 0, Y: 0},
},
{
Point{X: 0.5, Y: 0.5}, Point{X: 1.5, Y: 0.5},
Point{X: 1.5, Y: 1.5}, Point{X: 0.5, Y: 1.5},
Point{X: 0.5, Y: 0.5},
},
},
expected: 3.,
},
{
test: MultiPolygon{
{{
Point{X: 0, Y: 0}, Point{X: 2, Y: 0},
Point{X: 2, Y: 2}, Point{X: 0, Y: 2},
Point{X: 0, Y: 0},
}},
{{
Point{X: 2, Y: 2}, Point{X: 4, Y: 2},
Point{X: 4, Y: 4}, Point{X: 2, Y: 4},
Point{X: 2, Y: 2},
}},
},
expected: 8.,
},
{
// Polygon with inner ring that touches edge.
test: Polygon{
[]Point{
Point{X: 0, Y: 1},
Point{X: 1, Y: 0},
Point{X: 2, Y: 1},
Point{X: 1, Y: 2},
},
[]Point{
Point{X: 0, Y: 1},
Point{X: 1, Y: 0.5},
Point{X: 2, Y: 1},
Point{X: 1, Y: 1.5},
},
},
expected: 2. - 1.,
},
{
// Polygon with inner ring where all points of the inner ring
// touch the edge.
test: Polygon{
[]Point{
Point{X: 0, Y: 0},
Point{X: 2, Y: 0},
Point{X: 2, Y: 2},
Point{X: 0, Y: 2},
},
[]Point{
Point{X: 0, Y: 1},
Point{X: 1, Y: 0},
Point{X: 2, Y: 1},
Point{X: 1, Y: 2},
},
},
expected: 4. - 2.,
},
{
// Polygon with inner ring where all points of the inner ring
// touch the edge.
test: Polygon{
[]Point{
Point{X: 0, Y: 0},
Point{X: 2, Y: 0},
Point{X: 2, Y: 2},
Point{X: 0, Y: 2},
},
[]Point{
Point{X: 1, Y: 0},
Point{X: 2, Y: 2},
Point{X: 0, Y: 2},
},
},
expected: 4. - 2.,
},
{
// Polygon with outer ring where some of points of the inner ring
// touch the edge.
test: Polygon{
[]Point{
Point{X: 0, Y: 0},
Point{X: 2, Y: 0},
Point{X: 2, Y: 2},
Point{X: 0, Y: 2},
},
[]Point{
Point{X: 0, Y: 0},
Point{X: 0, Y: 1},
Point{X: 0, Y: 2},
Point{X: -1, Y: 1},
},
},
expected: 4. + 1.,
},
}
for i, test := range tests {
result := test.test.Area()
if result != test.expected {
t.Errorf("%d: expected %g, got %g", i, test.expected, result)
}
}
}