1 files changed, 93 insertions, 0 deletions
diff --git a/widgets/hourly.lua b/widgets/hourly.lua
new file mode 100644
index 0000000..9566823
--- /dev/null
+++ b/widgets/hourly.lua
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+-- Hourly: the next 24 hours as a temperature curve over rain-chance bars.
+--
+-- Adapted from the Conky-Mirage theme's hourly tile by alexsson-xexpanderx
+-- (see lib/weather.lua), redrawn in this repo's palette, glyphs and fonts.
+
+local card = require 'lib.card'
+local data = require 'lib.data'
+local weather = require 'lib.weather'
+
+local M = {}
+
+-- The band, top to bottom: glyph line, temperature line, curve, hour line.
+-- Every third hour is labelled; all 24 shape the curve.
+local function draw_curve(cr, x, y, w, h, colors, hours, S)
+  local n = #hours
+  local label = math.max(9, math.min(S * 0.30, h * 0.11))
+  local glyph = label * 1.5
+  local slot = w / n
+  local function px(i) return x + (i - 0.5) * slot end
+  local top = y + glyph + label * 1.6
+  local base = y + h - label * 1.6
+  if base - top < label * 2 then return end   -- no room: no curve beats a broken one
+
+  local lo, hi = math.huge, -math.huge
+  for _, hr in ipairs(hours) do
+    if hr.temp then lo, hi = math.min(lo, hr.temp), math.max(hi, hr.temp) end
+  end
+  if lo > hi then return end
+  -- A flat day still needs a span to divide by; 1 degree keeps it mid-band.
+  local span = math.max(hi - lo, 1)
+  local function py(t) return base - (base - top) * (0.15 + 0.7 * (t - lo) / span) end
+
+  -- Rain chance as bars rising from the baseline, under the curve.
+  card.rgba(cr, colors.rule, 0.5)
+  for i, hr in ipairs(hours) do
+    if hr.precip and hr.precip > 0 then
+      local bh = (base - top) * 0.5 * hr.precip / 100
+      cairo_rectangle(cr, px(i) - slot * 0.3, base - bh, slot * 0.6, bh)
+    end
+  end
+  cairo_fill(cr)
+
+  card.rgba(cr, colors.rule, 0.6)
+  cairo_set_line_width(cr, 1)
+  cairo_move_to(cr, x, base)
+  cairo_line_to(cr, x + w, base)
+  cairo_stroke(cr)
+
+  -- The curve, broken where an hour has no temperature rather than bridged.
+  card.rgba(cr, colors.highlight)
+  cairo_set_line_width(cr, math.max(1.5, label * 0.15))
+  local pen = false
+  for i, hr in ipairs(hours) do
+    if hr.temp then
+      if pen then cairo_line_to(cr, px(i), py(hr.temp))
+      else cairo_move_to(cr, px(i), py(hr.temp)) end
+      pen = true
+    else
+      pen = false
+    end
+  end
+  cairo_stroke(cr)
+
+  for i = 1, n, 3 do
+    local hr = hours[i]
+    card.font(cr, card.FONT_MONO, glyph, false)
+    card.rgba(cr, colors.highlight)
+    card.text_centre(cr, px(i), y + glyph, weather.icon(hr.code, hr.is_day))
+    card.font(cr, card.FONT_MONO, label, false)
+    card.rgba(cr, colors.value)
+    card.text_centre(cr, px(i), y + glyph + label * 1.3, weather.deg(hr.temp))
+    card.rgba(cr, colors.label)
+    card.text_centre(cr, px(i), y + h - label * 0.2,
+      hr.t and os.date('%H', hr.t) or '--')
+  end
+end
+
+function M.draw(cr, rect, colors)
+  local inner = card.card(cr, rect, colors)
+  local w = weather.parse(data.slurp(weather.CACHE))
+  if not w then
+    card.notice(cr, inner, colors, 'NEXT 24H', 'no weather data', 'bin/weather-fetch.sh')
+    return
+  end
+  -- hours[1] is the current hour, so the big value is the one after it.
+  local y, S = card.standard(cr, inner, colors, {
+    icon = card.ICON.hourly, title = 'NEXT 24H',
+    big = weather.deg((w.hours[2] or {}).temp), share = 0.3,
+  })
+  draw_curve(cr, inner.x, y, inner.w, inner.y + inner.h - y, colors, w.hours, S)
+end
+
+return M