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Re-center hodographs on the upper right quadrant

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XANTRONIX 2025-02-26 15:36:29 -05:00
parent deb76959d5
commit 7d70effbd0
1 changed files with 57 additions and 17 deletions
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68
lib/xmet/hodograph.py
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@ -6,11 +6,11 @@ from typing import Iterable
from xmet.igra import IGRAReader
from xmet.sounding import Sounding, SoundingSample
WIND_SPEED_MAX = 90 # knots
WIND_SPEED_MAX = 100 # knots
WIND_SPEED_MIN = 10
WIND_SPEED_STEP = 10
WIND_DIR_STEP = 45 # degrees
WIND_DIR_STEP = 90 # degrees
PRESSURE_MIN = 100
@ -24,27 +24,39 @@ class Hodograph():
def __init__(self, width, height):
self.width = min(width, height)
self.height = min(width, height)
self.radius = min(width, height) / 2
self.radius = min(width, height) * 1.2
def sample_to_screen(self, wind_speed: dir, wind_dir: float) -> tuple:
r = self.radius * min(wind_speed, WIND_SPEED_MAX) / WIND_SPEED_MAX
return (
self.width / 2 + r * math.cos(radians(wind_dir)),
self.height / 2 + r * math.sin(radians(wind_dir))
0.1 * self.width + r * math.cos(radians(wind_dir)),
0.9 * self.height + r * math.sin(radians(wind_dir))
)
def draw_speed_lines(self, cr: cairo.Context, x, y):
cr.save()
cr.set_source_rgb(0.5, 0.5, 0.5)
cr.set_line_width(0.5)
cr.set_dash([5, 5], 1)
for speed in range(WIND_SPEED_MIN, WIND_SPEED_MAX+1, WIND_SPEED_STEP):
cr.arc(x + self.width / 2,
y + self.height / 2,
cr.arc(x + 0.1 * self.width,
y + 0.9 * self.height,
self.radius * min(speed, WIND_SPEED_MAX) / WIND_SPEED_MAX,
0,
2*math.pi)
cr.stroke()
cr.restore()
def draw_direction_lines(self, cr: cairo.Context, x, y):
cr.save()
cr.set_source_rgb(0.5, 0.5, 0.5)
for angle in range(0, 360+1, WIND_DIR_STEP):
sx1, sy1 = self.sample_to_screen(WIND_SPEED_MAX, angle)
sx2, sy2 = self.sample_to_screen(WIND_SPEED_MAX, angle + 180)
@ -53,6 +65,8 @@ class Hodograph():
cr.line_to(x + sx2, y + sy2)
cr.stroke()
cr.restore()
def draw_direction_legends(self, cr: cairo.Context, x, y):
cr.save()
@ -67,8 +81,8 @@ class Hodograph():
extents = cr.text_extents(text)
r = self.radius + ((extents.width + extents.height) / 2)
sx = self.width / 2 + r * math.cos(radians(angle))
sy = self.height / 2 + r * math.sin(radians(angle))
sx = 0.1 * self.width + r * math.cos(radians(angle))
sy = 0.9 * self.height + r * math.sin(radians(angle))
cr.move_to(x + sx - extents.width / 2, y + sy + extents.height / 2)
cr.show_text(text)
@ -80,7 +94,7 @@ class Hodograph():
cr.save()
x_offset_scale = 0.01190476
y_offset_scale = 0.02380952
y_offset_scale = 0.01
x_offset = x_offset_scale * self.radius
y_offset = y_offset_scale * self.radius
@ -157,27 +171,51 @@ class Hodograph():
def draw_height_legends(self, cr: cairo.Context, x, y):
width = 0.02380952 * self.width
interval = 0.05952380 * self.width
offset = 0
offset = 0.75 * self.width
cr.save()
cr.set_source_rgb(1, 1, 1)
cr.rectangle(offset + x - width / 2,
y + width,
interval * 4,
width * 3)
cr.fill()
cr.set_source_rgb(0.8, 0.8, 0.8)
cr.rectangle(offset + x - width / 2,
y + width,
interval * 4,
width * 3)
cr.stroke()
cr.restore()
for height in self.COLORS:
color = self.COLORS[height]
cr.save()
cr.set_source_rgb(*color)
cr.rectangle(offset + x, y, width, width)
cr.rectangle(offset + x, y + width * 1.5, width, width)
cr.fill()
cr.restore()
cr.rectangle(offset + x, y, width, width)
cr.rectangle(offset + x, y + width * 1.5, width, width)
cr.stroke()
cr.move_to(offset + x, y + 2*width)
cr.move_to(offset + x, y + 3.5*width)
cr.show_text("%dkm" % (height / 1000))
cr.stroke()
offset += interval
def draw(self, cr: cairo.Context, x, y, samples: Iterable[SoundingSample]):
cr.rectangle(x, y, self.width, self.height)
cr.clip()
cr.rectangle(x, y, self.width, self.height)
cr.stroke()
self.draw_speed_lines(cr, x, y)
self.draw_direction_lines(cr, x, y)
@ -186,3 +224,5 @@ class Hodograph():
self.draw_speed_legends(cr, x, y)
self.draw_direction_legends(cr, x, y)
self.draw_height_legends(cr, x, y)
cr.reset_clip()