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package render
import "math"
// Temperature bands. The two ends are IMGW's own warning criteria, so a red
// temperature means the met office would issue a warning about it rather than
// that it looked hot to whoever wrote this:
//
// Tmin <= -15 silny mroz, stopien 1 -> bright blue
// Tmax >= 30 upal, stopien 1 -> red
// Tmax > 35 the higher heat level -> bright red
//
// The splits between (0, 10, 20) are round numbers, not thresholds from any
// source; they only subdivide the range nobody warns about.
var tempBands = []struct {
below float64
code string
}{
{0, Blue}, {10, Cyan}, {20, Green}, {30, Yellow},
}
// Deg rounds to whole degrees. Rounding through int conversion avoids "-0",
// which is arithmetically fine and visually wrong.
func Deg(t float64) int {
return int(math.Round(t))
}
// TempStyle is the ANSI code for a temperature in Celsius.
//
// The warning edges are written out rather than folded into tempBands so they
// match IMGW's criteria exactly, inclusive and exclusive included.
//
// The value is rounded first, so the colour always matches the number printed
// beside it: otherwise -14.6 prints as "-15" in a different colour than a true
// -15 and looks like a rendering bug.
func TempStyle(celsius float64) string {
t := float64(Deg(celsius))
switch {
case t <= -15:
return BrightBlue
case t > 35:
return BrightRed
case t >= 30:
return Red
}
for _, b := range tempBands {
if t < b.below {
return b.code
}
}
return Yellow
}
// Pollen bands in grains/m3, from Polish clinical sources. Each entry is an
// upper bound (exclusive) and a band key; a nil bound means "everything above".
//
// grass -- alergen.info.pl symptom table: 20 = first nasal symptoms in 25%
// of sufferers, 50 = symptoms in all tested, 65 = intensified in
// over 75%, 120 = dyspnoea after 30 minutes of exposure.
// birch -- mp.pl: 80 provokes symptoms in over 95% of allergics.
// mugwort -- mp.pl: over 70 counts as high, intensified symptoms.
//
// Birch and mugwort have a single published anchor each, so they get a two-way
// split rather than four bands: their "low" is weaker evidence than grass's.
// Alder, olive and ragweed have no Polish threshold that could be sourced and
// are deliberately left unbanded rather than banded on a guess.
var pollenBands = map[string][]struct {
below float64
band string
}{
"grass": {{20, "low"}, {50, "medium"}, {65, "high"}, {math.Inf(1), "very high"}},
"birch": {{80, "low"}, {math.Inf(1), "high"}},
"mugwort": {{70, "low"}, {math.Inf(1), "high"}},
}
// PollenBand is the qualitative level for a count, or "" where no threshold
// exists for that species.
func PollenBand(species string, value float64) string {
if value < 1 {
return "none"
}
bands, ok := pollenBands[species]
if !ok {
return ""
}
for _, b := range bands {
if value < b.below {
return b.band
}
}
return ""
}
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