From edf1af526fc34f84b01d9efc29c128a6ec333a84 Mon Sep 17 00:00:00 2001
From: XANTRONIX Industrial <xan@xantronix.com>
Date: Sun, 2 Mar 2025 16:27:28 -0500
Subject: [PATCH] Try to automatically zoom into hodograph activity
---
lib/xmet/hodograph.py | 37 +++++++++++++++++++++++++++++++++++--
1 file changed, 35 insertions(+), 2 deletions(-)
diff --git a/lib/xmet/hodograph.py b/lib/xmet/hodograph.py
index 008d770..b3f2100 100644
--- a/lib/xmet/hodograph.py
+++ b/lib/xmet/hodograph.py
@@ -22,8 +22,13 @@ def knots(ms: float) -> float:
class Hodograph():
def __init__(self, width, height):
self.zoom = 1.2
- self.offset_x = 0.1
- self.offset_y = 0.9
+ self.offset_x = 0.1 # Percentage of the upper left quadrant rendered
+ self.offset_y = 0.9 # Percentage of the upper right quadrant rendered
+
+ self.min_x = 0
+ self.min_y = 0
+ self.max_x = 0
+ self.max_y = 0
self.width = min(width, height)
self.height = min(width, height)
@@ -45,6 +50,32 @@ class Hodograph():
self.offset_y * self.height + gy
)
+ def find_extents(self, sounding: Sounding):
+ """
+ Determine the boundaries of the sounding to set the center and zoom
+ appropriately.
+ """
+ for sample in sounding.samples:
+ x, y = self.sample_to_graph(sample.wind_speed, sample.wind_dir)
+
+ if self.min_x > x:
+ self.min_x = x
+
+ if self.min_y > y:
+ self.min_y = y
+
+ if self.max_x < x:
+ self.max_x = x
+
+ if self.max_y < y:
+ self.max_y = y
+
+ self.offset_x = self.min_x / self.radius + 0.1
+ self.offset_y = (self.radius - self.max_y) / self.radius
+ self.zoom = min(self.width, self.height) / max(self.max_x - self.min_x,
+ self.max_y - self.min_y) / 2
+ self.radius = min(self.width, self.height) * self.zoom
+
def draw_speed_lines(self, cr: cairo.Context, x, y):
cr.save()
@@ -199,6 +230,8 @@ class Hodograph():
offset += interval
def draw(self, cr: cairo.Context, x, y, sounding: Sounding):
+ self.find_extents(sounding)
+
cr.rectangle(x, y, self.width, self.height)
cr.clip()