32 lines
899 B
Go
32 lines
899 B
Go
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// Copyright © 2016 Abcum Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package geof
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import (
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"github.com/abcum/surreal/sql"
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)
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func Contains(a *sql.Polygon, b *sql.Point) bool {
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beg := len(a.PS) - 1
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end := 0
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contains := raycast(b, a.PS[beg], a.PS[end])
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for i := 1; i < len(a.PS); i++ {
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if raycast(b, a.PS[i-1], a.PS[i]) {
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contains = !contains
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}
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}
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return contains
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}
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