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Issue #11: fix time mode.

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Add gradient color detection from the color scale for the given value.
This commit is contained in:
Sergey Vartanov 2020-09-20 23:52:24 +03:00
parent 604fd0d14c
commit aee36d0703
3 changed files with 57 additions and 35 deletions
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11
roentgen/flinger.py
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@ -1,12 +1,14 @@
"""
Author: Sergey Vartanov (me@enzet.ru)
Geo projection.
"""
import numpy as np
from roentgen.util import MinMax
EQUATOR_LENGTH: float = 40_075_017
EQUATOR_LENGTH: float = 40_075_017 # (in meters)
def pseudo_mercator(coordinates: np.array) -> np.array:
@ -51,6 +53,8 @@ class Flinger:
def fling(self, coordinates: np.array) -> np.array:
"""
Convert geo coordinates into SVG position points.
:param coordinates: vector to fling
"""
result: np.array = self.ratio * (
@ -63,5 +67,10 @@ class Flinger:
return result
def get_scale(self, coordinates: np.array) -> float:
"""
Return pixels per meter ratio for the given geo coordinates.
:param coordinates: geo coordinates
"""
scale_factor = 1 / np.cos(coordinates[0] / 180 * np.pi)
return self.pixels_per_meter * scale_factor