gramps
0f62e55474
`Controls/SegmentMeter` draws a 24-segment ladder in ONE OnRender pass — no per-segment elements updating on the UI thread, which is the difference between a meter and a UI thread tax. Level and peak are display fractions (what was MEASURED), never gain settings; vertical for the bay ladders, horizontal for the master strip. Bands come from `Helpers/MeterScale` (nominal/caution/peak, DESIGN.md thresholds) and live as dependencies of the control, so the painting logic is pure and testable: the band a segment paints is the level it measured. Brushes resolve from the theme tokens via SetResourceReference, so the ladder cannot drift from DESIGN.md. Peak-hold is the reason the header exists: a bar that follows the moment hides clipping, and clipping is the one audio fault that cannot be fixed after the stream. Guard: MeterScaleTests — band edges (inclusive at −12 and −3, as the standard states the ranges), the −60…0 display scale, and peak-hold rising instantly then decaying at 0.35/s.
36 lines
1.6 KiB
C#
36 lines
1.6 KiB
C#
using Xunit;
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using ytLive.Helpers;
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namespace ytLive.Tests;
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/// <summary>A segment ladder is only useful if the band it paints is the level it measured. The
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/// thresholds are DESIGN.md's (nominal / caution / peak), and peak-hold is what makes clipping
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/// visible — a bar that follows the moment hides the one audio fault that cannot be fixed later.
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/// </summary>
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public class MeterScaleTests
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{
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[Fact]
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public void Bands_peak_hold_and_the_display_scale_follow_the_standard()
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{
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// Bands at the documented thresholds.
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Assert.Equal(MeterBand.Nominal, MeterScale.BandFor(-30f));
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Assert.Equal(MeterBand.Nominal, MeterScale.BandFor(-12.1f));
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Assert.Equal(MeterBand.Caution, MeterScale.BandFor(-12f));
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Assert.Equal(MeterBand.Caution, MeterScale.BandFor(-6f));
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Assert.Equal(MeterBand.Peak, MeterScale.BandFor(-3f));
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Assert.Equal(MeterBand.Peak, MeterScale.BandFor(0f));
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// Display fraction: −60 dBFS is empty, 0 dBFS is full, −30 is halfway, and nothing escapes.
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Assert.Equal(0f, MeterScale.ToFraction(-60f));
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Assert.Equal(1f, MeterScale.ToFraction(0f));
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Assert.Equal(0.5f, MeterScale.ToFraction(-30f), 4);
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Assert.Equal(1f, MeterScale.ToFraction(+12f));
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Assert.Equal(0f, MeterScale.ToFraction(-120f));
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// Peak hold rises instantly, then decays at the stated rate.
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Assert.Equal(0.8f, MeterScale.NextPeak(0.2f, 0.8f, 0.05f));
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Assert.Equal(0.7f, MeterScale.NextPeak(0.8f, 0.1f, 0.1f / 0.35f), 3); // 0.1 fall at 0.35/s
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Assert.Equal(0f, MeterScale.NextPeak(0.1f, 0f, 10f)); // never negative
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}
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}
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