1 files changed, 80 insertions, 0 deletions

diff --git a/ingrex/utils.py b/ingrex/utils.py
new file mode 100755
index 0000000..8090f15
--- /dev/null
+++ b/ingrex/utils.py
@@ -0,0 +1,80 @@
+"Map Utils"
+from math import pi, sin, cos, tan, asin, radians, sqrt, log
+
+def calc_tile(lng, lat, zoomlevel):
+    tilecounts = [1,1,1,40,40,80,80,320,1E3,2E3,2E3,4E3,8E3,16E3,16E3,32E3]
+    rlat = radians(lat)
+    tilecount = tilecounts[zoomlevel]
+    xtile = int((lng + 180.0) / 360.0 * tilecount)
+    ytile = int((1.0 - log(tan(rlat) + (1 / cos(rlat))) / pi) / 2.0 * tilecount)
+    return xtile, ytile
+
+def calc_dist(lat1, lng1, lat2, lng2):
+    lat1, lng1, lat2, lng2 = map(radians, [lat1, lng1, lat2, lng2])
+    dlat = lat1 - lat2
+    dlng = lng1 - lng2
+    a = sin(dlat/2)**2 + cos(lat1) * cos(lat2) * sin(dlng/2)**2
+    c = 2* asin(sqrt(a))
+    m = 6367.0 * c * 1000
+    return m
+
+def point_in_poly(x, y, poly):
+    n = len(poly)
+    inside = False
+    p1x,p1y = poly[0]
+    for i in range(n+1):
+        p2x,p2y = poly[i % n]
+        if y > min(p1y, p2y):
+            if y <= max(p1y, p2y):
+                if x <= max(p1x, p2x):
+                    if p1y != p2y:
+                        xints = (y - p1y) * (p2x - p1x) / (p2y - p1y) + p1x
+                    if p1x == p2x or x <= xints:
+                        inside = not inside
+        p1x,p1y = p2x,p2y
+    return inside
+
+def transform(wgLat, wgLon):
+    """
+    transform(latitude,longitude) , WGS84
+    return (latitude,longitude) , GCJ02
+    """
+    a = 6378245.0
+    ee = 0.00669342162296594323
+    if (outOfChina(wgLat, wgLon)):
+        mgLat = wgLat
+        mgLon = wgLon
+        return mgLat,mgLon
+    dLat = transformLat(wgLon - 105.0, wgLat - 35.0)
+    dLon = transformLon(wgLon - 105.0, wgLat - 35.0)
+    radLat = wgLat / 180.0 * pi
+    magic = sin(radLat)
+    magic = 1 - ee * magic * magic
+    sqrtMagic = sqrt(magic)
+    dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi)
+    dLon = (dLon * 180.0) / (a / sqrtMagic * cos(radLat) * pi)
+    mgLat = wgLat + dLat
+    mgLon = wgLon + dLon
+    return mgLat,mgLon
+
+def outOfChina(lat, lon):
+    if (lon < 72.004 or lon > 137.8347):
+        return True
+    if (lat < 0.8293 or lat > 55.8271):
+        return True
+    return False
+
+def transformLat(x, y):
+    ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * sqrt(abs(x))
+    ret += (20.0 * sin(6.0 * x * pi) + 20.0 * sin(2.0 * x * pi)) * 2.0 / 3.0
+    ret += (20.0 * sin(y * pi) + 40.0 * sin(y / 3.0 * pi)) * 2.0 / 3.0
+    ret += (160.0 * sin(y / 12.0 * pi) + 320 * sin(y * pi / 30.0)) * 2.0 / 3.0
+    return ret
+
+def transformLon(x, y):
+    ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * sqrt(abs(x))
+    ret += (20.0 * sin(6.0 * x * pi) + 20.0 * sin(2.0 * x * pi)) * 2.0 / 3.0
+    ret += (20.0 * sin(x * pi) + 40.0 * sin(x / 3.0 * pi)) * 2.0 / 3.0
+    ret += (150.0 * sin(x / 12.0 * pi) + 300.0 * sin(x / 30.0 * pi)) * 2.0 / 3.0
+    return ret
+