Mercurial > dive4elements > river
comparison flys-backend/src/main/java/de/intevation/flys/importer/XY.java @ 5083:7bbee0cfc171 slt-simplify-cross-sections
Added experimental Douglas Peuker simplification of cross sections.
| author | Sascha L. Teichmann <teichmann@intevation.de> |
|---|---|
| date | Sun, 24 Feb 2013 17:29:52 +0100 |
| parents | 2b0426b79a92 |
| children |
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| 5082:fb4d87274f28 | 5083:7bbee0cfc171 |
|---|---|
| 10 protected double x; | 10 protected double x; |
| 11 protected double y; | 11 protected double y; |
| 12 protected int index; | 12 protected int index; |
| 13 | 13 |
| 14 public XY() { | 14 public XY() { |
| 15 } | |
| 16 | |
| 17 public XY(XY other) { | |
| 18 this(other.x, other.y, other.index); | |
| 15 } | 19 } |
| 16 | 20 |
| 17 public XY(double x, double y, int index) { | 21 public XY(double x, double y, int index) { |
| 18 this.x = x; | 22 this.x = x; |
| 19 this.y = y; | 23 this.y = y; |
| 50 } | 54 } |
| 51 | 55 |
| 52 public void setIndex(int index) { | 56 public void setIndex(int index) { |
| 53 this.index = index; | 57 this.index = index; |
| 54 } | 58 } |
| 59 | |
| 60 public double dot(double ox, double oy) { | |
| 61 return x*ox + y*oy; | |
| 62 } | |
| 63 | |
| 64 public double dot(XY other) { | |
| 65 return dot(other.x, other.y); | |
| 66 } | |
| 67 | |
| 68 public XY sub(XY other) { | |
| 69 x -= other.x; | |
| 70 y -= other.y; | |
| 71 return this; | |
| 72 } | |
| 73 | |
| 74 public XY ortho() { | |
| 75 double z = x; | |
| 76 x = y; | |
| 77 y = -z; | |
| 78 return this; | |
| 79 } | |
| 80 | |
| 81 public XY normalize() { | |
| 82 double len = dot(this); | |
| 83 | |
| 84 if (len > 1e-6) { | |
| 85 len = 1d/Math.sqrt(len); | |
| 86 x *= len; | |
| 87 y *= len; | |
| 88 } | |
| 89 | |
| 90 return this; | |
| 91 } | |
| 92 | |
| 93 // x*nx + y*ny + d = 0 <=> d = -x*nx -y*ny | |
| 94 public double lineOffset(XY p) { | |
| 95 return -x*p.x -y*p.y; | |
| 96 } | |
| 55 } | 97 } |
| 56 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : | 98 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |