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clip_test.go
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clip_test.go
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package geography
import (
"reflect"
"testing"
)
func TestClipLine(t *testing.T) {
cases := []struct {
name string
bound Bound
input LineString
output MultiLineString
}{
{
name: "clip line",
bound: Bound{Min: Point{0, 0}, Max: Point{30, 30}},
input: LineString{
{-10, 10}, {10, 10}, {10, -10}, {20, -10}, {20, 10}, {40, 10},
{40, 20}, {20, 20}, {20, 40}, {10, 40}, {10, 20}, {5, 20}, {-10, 20},
},
output: MultiLineString{
{{0, 10}, {10, 10}, {10, 0}},
{{20, 0}, {20, 10}, {30, 10}},
{{30, 20}, {20, 20}, {20, 30}},
{{10, 30}, {10, 20}, {5, 20}, {0, 20}},
},
},
{
name: "clips line crossign many times",
bound: Bound{Min: Point{0, 0}, Max: Point{20, 20}},
input: LineString{
{10, -10}, {10, 30}, {20, 30}, {20, -10},
},
output: MultiLineString{
{{10, 0}, {10, 20}},
{{20, 20}, {20, 0}},
},
},
{
name: "no changes if all inside",
bound: Bound{Min: Point{0, 0}, Max: Point{20, 20}},
input: LineString{
{1, 1}, {2, 2}, {3, 3},
},
output: MultiLineString{
{{1, 1}, {2, 2}, {3, 3}},
},
},
{
name: "empty if nothing in bound",
bound: Bound{Min: Point{0, 0}, Max: Point{2, 2}},
input: LineString{
{10, 10}, {20, 20}, {30, 30},
},
output: nil,
},
{
name: "floating point example",
bound: Bound{Min: Point{-91.93359375, 42.29356419217009}, Max: Point{-91.7578125, 42.42345651793831}},
input: LineString{
{-86.66015624999999, 42.22851735620852}, {-81.474609375, 38.51378825951165},
{-85.517578125, 37.125286284966776}, {-85.8251953125, 38.95940879245423},
{-90.087890625, 39.53793974517628}, {-91.93359375, 42.32606244456202},
{-86.66015624999999, 42.22851735620852},
},
output: MultiLineString{
{
{-91.91208030440808, 42.29356419217009},
{-91.93359375, 42.32606244456202},
{-91.7578125, 42.3228109416169},
},
},
},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
result := line(tc.bound, tc.input, false)
if !reflect.DeepEqual(result, tc.output) {
t.Errorf("incorrect clip")
t.Logf("%v", result)
t.Logf("%v", tc.output)
}
})
}
}
func TestClipRing(t *testing.T) {
cases := []struct {
name string
bound Bound
input LineString
output LineString
}{
{
name: "clips polygon",
bound: Bound{Min: Point{0, 0}, Max: Point{30, 30}},
input: LineString{
{-10, 10}, {0, 10}, {10, 10}, {10, 5}, {10, -5},
{10, -10}, {20, -10}, {20, 10}, {40, 10}, {40, 20},
{20, 20}, {20, 40}, {10, 40}, {10, 20}, {5, 20},
{-10, 20}},
// note: we allow duplicate points if polygon endpoints are
// on the box boundary.
output: LineString{
{0, 10}, {0, 10}, {10, 10}, {10, 5}, {10, 0},
{20, 0}, {20, 10}, {30, 10}, {30, 20}, {20, 20},
{20, 30}, {10, 30}, {10, 20}, {5, 20}, {0, 20},
},
},
{
name: "completely inside bound",
bound: Bound{Min: Point{0, 0}, Max: Point{10, 10}},
input: LineString{
{3, 3}, {5, 3}, {5, 5}, {3, 5}, {3, 3},
},
output: LineString{
{3, 3}, {5, 3}, {5, 5}, {3, 5}, {3, 3},
},
},
{
name: "completely around bound",
bound: Bound{Min: Point{1, 1}, Max: Point{2, 2}},
input: LineString{
{0, 0}, {3, 0}, {3, 3}, {0, 3}, {0, 0},
},
output: LineString{{1, 2}, {1, 1}, {2, 1}, {2, 2}, {1, 2}},
},
{
name: "completely around touching corners",
bound: Bound{Min: Point{1, 1}, Max: Point{3, 3}},
input: LineString{
{0, 2}, {2, 0}, {4, 2}, {2, 4}, {0, 2},
},
output: LineString{{1, 1}, {1, 1}, {3, 1}, {3, 1}, {3, 3}, {3, 3}, {1, 3}, {1, 3}, {1, 1}},
},
{
name: "around but cut corners",
bound: Bound{Min: Point{0.5, 0.5}, Max: Point{3.5, 3.5}},
input: LineString{
{0, 2}, {2, 4}, {4, 2}, {2, 0}, {0, 2},
},
output: LineString{{0.5, 2.5}, {1.5, 3.5}, {2.5, 3.5}, {3.5, 2.5}, {3.5, 1.5}, {2.5, 0.5}, {1.5, 0.5}, {0.5, 1.5}, {0.5, 2.5}},
},
{
name: "unclosed ring",
bound: Bound{Min: Point{1, 1}, Max: Point{4, 4}},
input: LineString{
{2, 0}, {3, 0}, {3, 5}, {2, 5},
},
output: LineString{{3, 1}, {3, 4}},
},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
result := ring(tc.bound, tc.input)
if !reflect.DeepEqual(result, tc.output) {
t.Errorf("incorrect clip")
t.Logf("%v", result)
t.Logf("%v", tc.output)
}
})
}
}