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Simonstrator
API
Commits
cc0f748c
Commit
cc0f748c
authored
Apr 18, 2018
by
Tobias Meuser
Browse files
Updated Geohash features
parent
8f511c27
Changes
1
Show whitespace changes
Inline
Side-by-side
src/de/tudarmstadt/maki/simonstrator/api/util/Geohash.java
View file @
cc0f748c
...
@@ -45,14 +45,14 @@ public class Geohash {
...
@@ -45,14 +45,14 @@ public class Geohash {
double
currentCellY
=
pLocation
.
getLatitude
()
-
offsetY
;
double
currentCellY
=
pLocation
.
getLatitude
()
-
offsetY
;
boolean
nextBit
;
boolean
nextBit
;
if
(
i
%
2
==
0
)
{
if
((
i
+
j
)
%
2
==
0
)
{
nextBit
=
getNextBit
(
currentCellX
,
cellSize
.
getSizeX
());
nextBit
=
getNextBit
(
currentCellX
,
cellSize
.
getSizeX
());
}
else
{
}
else
{
nextBit
=
getNextBit
(
currentCellY
,
cellSize
.
getSizeY
());
nextBit
=
getNextBit
(
currentCellY
,
cellSize
.
getSizeY
());
}
}
if
(
nextBit
)
{
if
(
nextBit
)
{
if
(
i
%
2
==
0
)
{
if
(
(
i
+
j
)
%
2
==
0
)
{
offsetX
+=
cellSize
.
getSizeX
()
/
2.0
;
offsetX
+=
cellSize
.
getSizeX
()
/
2.0
;
}
else
{
}
else
{
offsetY
+=
cellSize
.
getSizeY
()
/
2.0
;
offsetY
+=
cellSize
.
getSizeY
()
/
2.0
;
...
@@ -70,27 +70,141 @@ public class Geohash {
...
@@ -70,27 +70,141 @@ public class Geohash {
}
}
}
}
return
encode
(
bytes
);
return
encode
(
bytes
);
}
}
public
static
String
[]
getAdjacentGeohashes
(
String
pGeohash
)
{
String
[]
geohashes
=
new
String
[]
{
getAdjacentGeohash
(
pGeohash
,
1
,
0
),
getAdjacentGeohash
(
pGeohash
,
-
1
,
0
),
getAdjacentGeohash
(
pGeohash
,
0
,
1
),
getAdjacentGeohash
(
pGeohash
,
0
,
-
1
)
};
return
geohashes
;
}
/**
* @param pGeohash
* @param pX
* @param pY
* @return
*/
public
static
String
getAdjacentGeohash
(
String
pGeohash
,
int
pX
,
int
pY
)
{
byte
[]
decode
=
decode
(
pGeohash
);
if
(
pX
!=
0
)
{
boolean
reduce
=
pX
<
0
;
outer:
for
(
int
i
=
decode
.
length
-
1
;
i
>=
0
;
i
--)
{
for
(
int
j
=
0
;
j
<
5
;
j
++)
{
if
((
i
+
j
)
%
2
==
0
)
{
boolean
bitSet
=
isBitSet
(
decode
[
i
],
j
);
if
(
reduce
)
{
decode
[
i
]
=
toogleBit
(
decode
[
i
],
j
);
if
(
bitSet
)
{
break
outer
;
}
}
else
{
decode
[
i
]
=
toogleBit
(
decode
[
i
],
j
);
if
(!
bitSet
)
{
break
outer
;
}
}
}
}
}
}
if
(
pY
!=
0
)
{
boolean
reduce
=
pY
<
0
;
outer:
for
(
int
i
=
decode
.
length
-
1
;
i
>=
0
;
i
--)
{
for
(
int
j
=
0
;
j
<
5
;
j
++)
{
if
((
i
+
j
)
%
2
==
1
)
{
boolean
bitSet
=
isBitSet
(
decode
[
i
],
j
);
if
(
reduce
)
{
decode
[
i
]
=
toogleBit
(
decode
[
i
],
j
);
if
(
bitSet
)
{
break
outer
;
}
}
else
{
decode
[
i
]
=
toogleBit
(
decode
[
i
],
j
);
if
(!
bitSet
)
{
break
outer
;
}
}
}
}
}
}
return
encode
(
decode
);
}
private
static
boolean
isBitSet
(
byte
b
,
int
offset
)
{
return
getBit
(
b
,
offset
)
==
1
;
}
private
static
byte
getBit
(
byte
b
,
int
offset
)
{
return
(
byte
)
((
b
%
Math
.
pow
(
2
,
offset
+
1
))
/
Math
.
pow
(
2
,
offset
));
}
private
static
byte
setBit
(
byte
b
,
int
offset
,
int
value
)
{
return
(
byte
)
(
b
+
Math
.
pow
(
2
,
offset
)
*
(
value
-
getBit
(
b
,
offset
)));
}
private
static
byte
toogleBit
(
byte
b
,
int
offset
)
{
if
(
isBitSet
(
b
,
offset
))
{
return
setBit
(
b
,
offset
,
0
);
}
else
{
return
setBit
(
b
,
offset
,
1
);
}
}
private
static
String
encode
(
byte
[]
pBytes
)
{
private
static
String
encode
(
byte
[]
pBytes
)
{
StringBuffer
buffer
=
new
StringBuffer
();
StringBuffer
buffer
=
new
StringBuffer
();
for
(
int
i
=
0
;
i
<
pBytes
.
length
;
i
++)
{
for
(
int
i
=
0
;
i
<
pBytes
.
length
;
i
++)
{
if
(
pBytes
[
i
]
<=
9
)
{
byte
b
=
pBytes
[
i
];
buffer
.
append
(
pBytes
[
i
]);
buffer
.
append
(
encodeByte
(
b
));
}
else
if
(
pBytes
[
i
]
<=
16
)
{
}
buffer
.
append
((
char
)
(
pBytes
[
i
]
+
'b'
-
10
));
return
buffer
.
toString
();
}
else
if
(
pBytes
[
i
]
<=
18
)
{
}
buffer
.
append
((
char
)
(
pBytes
[
i
]
+
'j'
-
17
));
}
else
if
(
pBytes
[
i
]
<=
20
)
{
private
static
char
encodeByte
(
byte
b
)
{
buffer
.
append
((
char
)
(
pBytes
[
i
]
+
'j'
-
19
));
if
(
b
<=
9
)
{
}
else
if
(
pBytes
[
i
]
<=
32
)
{
return
(
char
)
(
b
+
'0'
);
buffer
.
append
((
char
)
(
pBytes
[
i
]
+
'p'
-
21
));
}
else
if
(
b
<=
16
)
{
return
(
char
)
(
b
+
'b'
-
10
);
}
else
if
(
b
<=
18
)
{
return
(
char
)
(
b
+
'j'
-
17
);
}
else
if
(
b
<=
20
)
{
return
(
char
)
(
b
+
'm'
-
19
);
}
else
if
(
b
<=
32
)
{
return
(
char
)
(
b
+
'p'
-
21
);
}
else
{
}
else
{
throw
new
IllegalArgumentException
(
"Must not have a value greater than 32 in Base32 encoding!"
);
throw
new
IllegalArgumentException
(
"Must not have a value greater than 32 in Base32 encoding!"
);
}
}
}
}
return
buffer
.
toString
();
private
static
byte
decodeByte
(
char
c
)
{
if
(
c
>=
'p'
)
{
return
(
byte
)
(
c
-
'p'
+
21
);
}
else
if
(
c
>=
'm'
)
{
return
(
byte
)
(
c
-
'm'
+
19
);
}
else
if
(
c
>=
'j'
)
{
return
(
byte
)
(
c
-
'j'
+
17
);
}
else
if
(
c
>=
'b'
)
{
return
(
byte
)
(
c
-
'b'
+
10
);
}
else
if
(
c
>=
'0'
)
{
return
(
byte
)
(
c
-
'0'
+
0
);
}
return
-
1
;
}
public
static
byte
[]
decode
(
String
pGeohash
)
{
byte
[]
bytes
=
new
byte
[
pGeohash
.
length
()];
for
(
int
i
=
0
;
i
<
pGeohash
.
length
();
i
++)
{
bytes
[
i
]
=
decodeByte
(
pGeohash
.
charAt
(
i
));
}
return
bytes
;
}
}
private
static
boolean
getNextBit
(
double
currentCellPosition
,
double
currentCellSize
)
{
private
static
boolean
getNextBit
(
double
currentCellPosition
,
double
currentCellSize
)
{
...
...
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