CG_ConstrainedDelaunayTriangles
戻る  8.3. SFCGAL 処理関数および関係関数  次へ

名前

CG_ConstrainedDelaunayTriangles — 入力ジオメトリーの周りの制約付きドロネー三角形を返します。

概要

geometry CG_ConstrainedDelaunayTriangles(geometry g1);

説明

入力ジオメトリーの周りの制約付きドロネー三角形 (Constrained Delaunay triangulation) を返します。出力は TIN です。

このメソッドには SFCGAL バックエンドが必要です。

Availability: 3.0.0

この関数は3次元に対応し、Z値を削除しません。

例

ポリゴンとバッファーを施したポイントの制約付きドロネー三角形。

コード
SELECT
  CG_ConstrainedDelaunayTriangles(
    ST_Union(
      'POLYGON((175 150,20 40,50 60,125 100,175 150))'::geometry,
      ST_Buffer('POINT(110 170)'::geometry, 20)
    )
  );
出力
TIN(((50 60,175 150,20 40,50 60)),((125 100,50 60,20 40,125 100)),((50 60,125 100,175 150,50 60)),((130 170,129.6 166.1,175 150,130 170)),((128.5 162.3,175 150,129.6 166.1,128.5 162.3)),((130 170,124.1 155.9,129.6 166.1,130 170)),((126.6 158.9,175 150,128.5 162.3,126.6 158.9)),((129.6 166.1,126.6 158.9,128.5 162.3,129.6 166.1)),((124.1 155.9,175 150,126.6 158.9,124.1 155.9)),((129.6 166.1,124.1 155.9,126.6 158.9,129.6 166.1)),((121.1 153.4,175 150,124.1 155.9,121.1 153.4)),((110 150,121.1 153.4,124.1 155.9,110 150)),((117.7 151.5,175 150,121.1 153.4,117.7 151.5)),((113.9 150.4,117.7 151.5,121.1 153.4,113.9 150.4)),((113.9 150.4,175 150,117.7 151.5,113.9 150.4)),((20 40,113.9 150.4,110 150,20 40)),((20 40,175 150,113.9 150.4,20 40)),((20 40,110 150,106.1 150.4,20 40)),((113.9 150.4,121.1 153.4,110 150,113.9 150.4)),((20 40,106.1 150.4,102.3 151.5,20 40)),((110 150,124.1 155.9,128.5 177.7,110 150)),((20 40,102.3 151.5,98.9 153.4,20 40)),((106.1 150.4,110 150,98.9 153.4,106.1 150.4)),((20 40,98.9 153.4,95.9 155.9,20 40)),((102.3 151.5,106.1 150.4,98.9 153.4,102.3 151.5)),((20 40,95.9 155.9,93.4 158.9,20 40)),((98.9 153.4,110 150,95.9 155.9,98.9 153.4)),((20 40,93.4 158.9,91.5 162.3,20 40)),((95.9 155.9,110 150,102.3 188.5,95.9 155.9)),((20 40,91.5 162.3,90.4 166.1,20 40)),((93.4 158.9,95.9 155.9,91.5 162.3,93.4 158.9)),((20 40,90.4 166.1,90 170,20 40)),((91.5 162.3,95.9 155.9,90 170,91.5 162.3)),((20 40,90 170,90.4 173.9,20 40)),((90.4 166.1,91.5 162.3,90 170,90.4 166.1)),((20 40,90.4 173.9,91.5 177.7,20 40)),((90 170,95.9 155.9,102.3 188.5,90 170)),((90.4 173.9,90 170,91.5 177.7,90.4 173.9)),((91.5 177.7,90 170,102.3 188.5,91.5 177.7)),((93.4 181.1,91.5 177.7,95.9 184.1,93.4 181.1)),((95.9 184.1,91.5 177.7,102.3 188.5,95.9 184.1)),((98.9 186.6,95.9 184.1,102.3 188.5,98.9 186.6)),((102.3 188.5,110 150,128.5 177.7,102.3 188.5)),((106.1 189.6,102.3 188.5,110 190,106.1 189.6)),((110 190,102.3 188.5,117.7 188.5,110 190)),((113.9 189.6,110 190,117.7 188.5,113.9 189.6)),((117.7 188.5,102.3 188.5,128.5 177.7,117.7 188.5)),((121.1 186.6,124.1 184.1,175 150,121.1 186.6)),((121.1 186.6,117.7 188.5,124.1 184.1,121.1 186.6)),((124.1 184.1,126.6 181.1,175 150,124.1 184.1)),((124.1 184.1,117.7 188.5,128.5 177.7,124.1 184.1)),((126.6 181.1,128.5 177.7,175 150,126.6 181.1)),((126.6 181.1,124.1 184.1,128.5 177.7,126.6 181.1)),((128.5 177.7,129.6 173.9,175 150,128.5 177.7)),((128.5 177.7,124.1 155.9,130 170,128.5 177.7)),((129.6 173.9,130 170,175 150,129.6 173.9)),((129.6 173.9,128.5 177.7,130 170,129.6 173.9)))
図
Geometry figure for visual-cg-constraineddelaunaytriangles-01

ST_DelaunayTriangles を同じ入力に適用する。三角形の辺はポリゴン境界とクロスします。

コード
SELECT
  ST_DelaunayTriangles(
    ST_Union(
      'POLYGON((175 150,20 40,50 60,125 100,175 150))'::geometry,
      ST_Buffer('POINT(110 170)'::geometry, 20)
    )
  );
出力
GEOMETRYCOLLECTION(POLYGON((95.9 184.1,93.4 181.1,95.9 155.9,95.9 184.1)), POLYGON((95.9 184.1,95.9 155.9,102.3 188.5,95.9 184.1)), POLYGON((95.9 184.1,102.3 188.5,98.9 186.6,95.9 184.1)), POLYGON((102.3 188.5,95.9 155.9,98.9 153.4,102.3 188.5)), POLYGON((102.3 188.5,98.9 153.4,102.3 151.5,102.3 188.5)), POLYGON((102.3 188.5,102.3 151.5,106.1 189.6,102.3 188.5)), POLYGON((106.1 189.6,102.3 151.5,106.1 150.4,106.1 189.6)), POLYGON((106.1 189.6,106.1 150.4,110 190,106.1 189.6)), POLYGON((110 190,106.1 150.4,110 150,110 190)), POLYGON((110 190,110 150,117.7 188.5,110 190)), POLYGON((110 190,117.7 188.5,113.9 189.6,110 190)), POLYGON((117.7 188.5,110 150,121.1 153.4,117.7 188.5)), POLYGON((117.7 188.5,121.1 153.4,121.1 186.6,117.7 188.5)), POLYGON((121.1 186.6,121.1 153.4,124.1 155.9,121.1 186.6)), POLYGON((121.1 186.6,124.1 155.9,124.1 184.1,121.1 186.6)), POLYGON((121.1 186.6,124.1 184.1,175 150,121.1 186.6)), POLYGON((175 150,124.1 184.1,126.6 181.1,175 150)), POLYGON((175 150,126.6 181.1,128.5 177.7,175 150)), POLYGON((175 150,128.5 177.7,129.6 173.9,175 150)), POLYGON((175 150,129.6 173.9,130 170,175 150)), POLYGON((175 150,130 170,129.6 166.1,175 150)), POLYGON((175 150,129.6 166.1,128.5 162.3,175 150)), POLYGON((175 150,128.5 162.3,126.6 158.9,175 150)), POLYGON((175 150,126.6 158.9,124.1 155.9,175 150)), POLYGON((175 150,124.1 155.9,125 100,175 150)), POLYGON((125 100,124.1 155.9,121.1 153.4,125 100)), POLYGON((125 100,121.1 153.4,117.7 151.5,125 100)), POLYGON((125 100,117.7 151.5,113.9 150.4,125 100)), POLYGON((125 100,113.9 150.4,110 150,125 100)), POLYGON((125 100,110 150,106.1 150.4,125 100)), POLYGON((125 100,106.1 150.4,102.3 151.5,125 100)), POLYGON((125 100,102.3 151.5,98.9 153.4,125 100)), POLYGON((125 100,98.9 153.4,50 60,125 100)), POLYGON((125 100,50 60,20 40,125 100)), POLYGON((20 40,50 60,90.4 166.1,20 40)), POLYGON((20 40,90.4 166.1,90 170,20 40)), POLYGON((20 40,90 170,90.4 173.9,20 40)), POLYGON((20 40,90.4 173.9,91.5 177.7,20 40)), POLYGON((91.5 177.7,90.4 173.9,90 170,91.5 177.7)), POLYGON((91.5 177.7,90 170,91.5 162.3,91.5 177.7)), POLYGON((91.5 177.7,91.5 162.3,93.4 158.9,91.5 177.7)), POLYGON((91.5 177.7,93.4 158.9,93.4 181.1,91.5 177.7)), POLYGON((93.4 181.1,93.4 158.9,95.9 155.9,93.4 181.1)), POLYGON((95.9 155.9,93.4 158.9,50 60,95.9 155.9)), POLYGON((95.9 155.9,50 60,98.9 153.4,95.9 155.9)), POLYGON((50 60,93.4 158.9,91.5 162.3,50 60)), POLYGON((50 60,91.5 162.3,90.4 166.1,50 60)), POLYGON((90.4 166.1,91.5 162.3,90 170,90.4 166.1)), POLYGON((110 150,113.9 150.4,121.1 153.4,110 150)), POLYGON((121.1 153.4,113.9 150.4,117.7 151.5,121.1 153.4)), POLYGON((124.1 155.9,126.6 158.9,129.6 166.1,124.1 155.9)), POLYGON((124.1 155.9,129.6 166.1,128.5 177.7,124.1 155.9)), POLYGON((124.1 155.9,128.5 177.7,124.1 184.1,124.1 155.9)), POLYGON((124.1 184.1,128.5 177.7,126.6 181.1,124.1 184.1)), POLYGON((128.5 177.7,129.6 166.1,130 170,128.5 177.7)), POLYGON((128.5 177.7,130 170,129.6 173.9,128.5 177.7)), POLYGON((129.6 166.1,126.6 158.9,128.5 162.3,129.6 166.1)))
図
Geometry figure for visual-cg-constraineddelaunaytriangles-02