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package simplify
import (
"reflect"
"testing"
"github.com/paulmach/orb"
)
func TestDouglasPeucker(t *testing.T) {
cases := []struct {
name string
threshold float64
ls orb.LineString
expected orb.LineString
indexMap []int
}{
{
name: "no reduction",
threshold: 0.1,
ls: orb.LineString{{0, 0}, {0.5, 0.2}, {1, 0}},
expected: orb.LineString{{0, 0}, {0.5, 0.2}, {1, 0}},
indexMap: []int{0, 1, 2},
},
{
name: "reduction",
threshold: 1.1,
ls: orb.LineString{{0, 0}, {0.5, 0.2}, {1, 0}},
expected: orb.LineString{{0, 0}, {1, 0}},
indexMap: []int{0, 2},
},
{
name: "removes coplanar points",
threshold: 0,
ls: orb.LineString{{0, 0}, {0, 1}, {0, 2}},
expected: orb.LineString{{0, 0}, {0, 2}},
indexMap: []int{0, 2},
},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
v, im := DouglasPeucker(tc.threshold).simplify(tc.ls, true)
if !v.Equal(tc.expected) {
t.Log(v)
t.Log(tc.expected)
t.Errorf("incorrect line")
}
if !reflect.DeepEqual(im, tc.indexMap) {
t.Log(im)
t.Log(tc.indexMap)
t.Errorf("incorrect index map")
}
})
}
}
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