Mercurial > gemma
comparison pkg/octree/vertex.go @ 4542:56f4e8cbfab7 iso-areas
Sew together triangles that totally inside a single class.
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Thu, 26 Sep 2019 18:11:38 +0200 |
| parents | 4233570de212 |
| children | aa2d0006e742 |
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| 4541:53b55f811666 | 4542:56f4e8cbfab7 |
|---|---|
| 625 binary.Write(buf, binary.LittleEndian, math.Float64bits(p.Y)) | 625 binary.Write(buf, binary.LittleEndian, math.Float64bits(p.Y)) |
| 626 } | 626 } |
| 627 } | 627 } |
| 628 | 628 |
| 629 return buf.Bytes() | 629 return buf.Bytes() |
| 630 } | |
| 631 | |
| 632 func (ls LineStringZ) CCW() bool { | |
| 633 var sum float64 | |
| 634 for i, v1 := range ls { | |
| 635 v2 := ls[(i+1)%len(ls)] | |
| 636 sum += (v2.X - v1.X) * (v2.Y + v1.Y) | |
| 637 } | |
| 638 return sum > 0 | |
| 630 } | 639 } |
| 631 | 640 |
| 632 // Join joins two lines leaving the first of the second out. | 641 // Join joins two lines leaving the first of the second out. |
| 633 func (ls LineStringZ) Join(other LineStringZ) LineStringZ { | 642 func (ls LineStringZ) Join(other LineStringZ) LineStringZ { |
| 634 nline := make(LineStringZ, len(ls)+len(other)-1) | 643 nline := make(LineStringZ, len(ls)+len(other)-1) |