47 lines
2.0 KiB
C#
47 lines
2.0 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using OpenNest.Geometry;
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namespace OpenNest.Diagnostics;
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/// <summary>Read-only pair presentation; no geometry preparation or collision queries.</summary>
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public static class OverlapPairPresentation
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{
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public static string Label(PlateOverlapPair pair) => $"{pair.PartAId + 1}/{pair.PartBId + 1}";
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public static string Details(PlateOverlapPair pair, Units capturedUnits, IFormatProvider provider = null)
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{
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var units = UnitsHelper.GetShortString(capturedUnits);
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return $"Pair {Label(pair)}: {pair.PartAName} / {pair.PartBName}\n"
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+ $"Shared area ≈ {Number(pair.Area, provider)} {units}²\n"
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+ $"Centroid: ({Number(pair.Centroid.X, provider)}, {Number(pair.Centroid.Y, provider)}) {units}";
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}
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// Significant figures adapt to scale: a positive sliver must never read as zero.
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public static string Number(double value, IFormatProvider provider = null) =>
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value.ToString("G6", provider ?? CultureInfo.CurrentCulture);
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public static double MarkerHalfSize(int deviceDpi) => 6.0 * deviceDpi / 96;
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public static double HitRadius(int deviceDpi) => 10.0 * deviceDpi / 96;
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/// <summary>
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/// Projects cached centroids into a screen-pixel coordinate space. The pointer must
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/// use that same space; view zoom never scales the DPI-adjusted hit radius.
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/// Coincident or nearby markers return every matching pair in stable ID order.
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/// </summary>
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public static IReadOnlyList<PlateOverlapPair> HitTest(IEnumerable<PlateOverlapPair> pairs,
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Func<Vector, Vector> worldToScreen, Vector pointer, int deviceDpi)
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{
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var radius = HitRadius(deviceDpi);
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return pairs.Where(pair =>
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{
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var center = worldToScreen(pair.Centroid);
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var dx = pointer.X - center.X;
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var dy = pointer.Y - center.Y;
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return dx * dx + dy * dy <= radius * radius;
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}).OrderBy(pair => pair.PartAId).ThenBy(pair => pair.PartBId).ToArray();
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}
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}
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