wehub-resource-sync
108 lines
4.4 KiB
C#
108 lines
4.4 KiB
C#
using ImGuiNET;
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using T3.Editor.Gui.Input;
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using T3.Editor.Gui.Styling;
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namespace T3.Editor.Gui.UiHelpers;
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/// <summary>
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/// Provides shared audio level meter (VU meter) drawing functionality.
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/// </summary>
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internal static class AudioLevelMeter
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{
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private const float LedWidthBase = 20f;
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private const float LedSpacingBase = 5f;
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private const float DefaultDecayRate = 2f;
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private static float LedWidth => LedWidthBase * T3Ui.UiScaleFactor;
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private static float LedSpacing => LedSpacingBase * T3Ui.UiScaleFactor;
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private static float LedTotalWidth => LedWidth + LedSpacing;
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/// <summary>
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/// Draws an audio level meter with clipping indicator.
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/// </summary>
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internal static void Draw(string label, float currentLevel, ref float smoothedLevel, float decayRate = DefaultDecayRate, float leftPadding = 0f, float rightEdgeX = 0f)
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{
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var (min, max) = PrepareAndGetBounds(label, currentLevel, ref smoothedLevel, decayRate);
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min.X += leftPadding;
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var meterEndX = rightEdgeX > 0
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? rightEdgeX - LedTotalWidth
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: max.X - LedTotalWidth - 10f * T3Ui.UiScaleFactor;
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DrawMeterContent(min, max, meterEndX, currentLevel, smoothedLevel);
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}
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/// <summary>
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/// Draws an audio level meter where the entire meter (bar + LED) fits within the specified bounds.
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/// </summary>
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internal static void DrawAbsoluteWithinBounds(string label, float currentLevel, ref float smoothedLevel, float decayRate, float leftEdgeX, float rightEdgeX)
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{
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var meterWidth = rightEdgeX - leftEdgeX;
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// Position cursor at the left edge (convert from screen to window coordinates)
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var windowPos = ImGui.GetWindowPos();
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ImGui.SetCursorPosX(leftEdgeX - windowPos.X);
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var uniqueId = string.IsNullOrEmpty(label) ? "##levelMeter" : $"##{label}Meter";
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ImGui.InvisibleButton(uniqueId, new Vector2(meterWidth, ImGui.GetFrameHeight()));
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smoothedLevel = currentLevel > smoothedLevel
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? currentLevel
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: Math.Max(currentLevel, smoothedLevel - decayRate * ImGui.GetIO().DeltaTime);
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var min = ImGui.GetItemRectMin();
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var max = ImGui.GetItemRectMax();
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// Fit the entire meter (bar + LED) within bounds
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var meterEndX = min.X + meterWidth - LedTotalWidth;
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var ledRightX = min.X + meterWidth;
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DrawMeterContent(min, max, meterEndX, currentLevel, smoothedLevel, ledRightX);
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}
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private static (Vector2 min, Vector2 max) PrepareAndGetBounds(string label, float currentLevel, ref float smoothedLevel, float decayRate)
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{
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FormInputs.DrawInputLabel(label);
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var uniqueId = string.IsNullOrEmpty(label) ? "##levelMeter" : $"##{label}Meter";
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ImGui.InvisibleButton(uniqueId, new Vector2(-1, ImGui.GetFrameHeight()));
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smoothedLevel = currentLevel > smoothedLevel
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? currentLevel
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: Math.Max(currentLevel, smoothedLevel - decayRate * ImGui.GetIO().DeltaTime);
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return (ImGui.GetItemRectMin(), ImGui.GetItemRectMax());
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}
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private static void DrawMeterContent(Vector2 min, Vector2 max, float meterEndX, float currentLevel, float smoothedLevel, float? maxRightEdge = null)
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{
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var dl = ImGui.GetWindowDrawList();
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var meterWidth = meterEndX - min.X;
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var paddedHeight = (max.Y - min.Y) / 3f;
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var topY = min.Y + paddedHeight;
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var bottomY = max.Y - paddedHeight;
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// Gradient bar: green to orange
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dl.AddRectFilledMultiColor(
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new Vector2(min.X, topY),
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new Vector2(min.X + meterWidth, bottomY),
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UiColors.StatusControlled, UiColors.StatusWarning,
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UiColors.StatusWarning, UiColors.StatusControlled);
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// Cover unfilled portion
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var clampedLevel = Math.Min(smoothedLevel, 1f);
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var levelPosition = min.X + meterWidth * clampedLevel;
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dl.AddRectFilled(
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new Vector2(levelPosition, topY),
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new Vector2(min.X + meterWidth, bottomY),
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UiColors.BackgroundHover);
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// Clipping LED indicator
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var ledLeftX = meterEndX + LedSpacing;
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var ledRightX = maxRightEdge ?? (meterEndX + LedSpacing + LedWidth);
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dl.AddRectFilled(
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new Vector2(ledLeftX, topY),
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new Vector2(ledRightX, bottomY),
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currentLevel >= 1f ? UiColors.StatusError : UiColors.BackgroundHover);
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}
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}
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