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feat: add pierce clearance clamping for circle contour lead-ins

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Scales down lead-ins that would place the pierce point too close to the
opposite wall of small holes. Uses quadratic solve to find the maximum
safe distance inside a clearance-reduced radius. Adds Scale() method to
all LeadIn types and applies clamping in both the strategy and the
interactive preview.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
AJ Isaacs
2026-03-30 19:35:41 -04:00
parent a399c89f58
commit e860ca3f4a
9 changed files with 96 additions and 0 deletions
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OpenNest/Actions/ActionLeadIn.cs
+30
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@@ -2,6 +2,7 @@ using OpenNest.CNC.CuttingStrategy;
using OpenNest.Controls;
using OpenNest.Converters;
using OpenNest.Geometry;
using OpenNest.Math;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
@@ -148,6 +149,35 @@ namespace OpenNest.Actions
if (leadIn == null)
return;
// Clamp lead-in for circle contours so it stays inside the hole
if (snapContourType == ContourType.ArcCircle && snapEntity is Circle snapCircle
&& parameters.PierceClearance > 0)
{
var pierceCheck = leadIn.GetPiercePoint(snapPoint, snapNormal);
var distFromCenter = pierceCheck.DistanceTo(snapCircle.Center);
var maxRadius = snapCircle.Radius - parameters.PierceClearance;
if (maxRadius > 0 && distFromCenter > maxRadius)
{
var currentDist = snapPoint.DistanceTo(pierceCheck);
if (currentDist > Tolerance.Epsilon)
{
var dx = (pierceCheck.X - snapPoint.X) / currentDist;
var dy = (pierceCheck.Y - snapPoint.Y) / currentDist;
var vx = snapPoint.X - snapCircle.Center.X;
var vy = snapPoint.Y - snapCircle.Center.Y;
var b = 2.0 * (vx * dx + vy * dy);
var c = vx * vx + vy * vy - maxRadius * maxRadius;
var disc = b * b - 4.0 * c;
if (disc >= 0)
{
var t = (-b + System.Math.Sqrt(disc)) / 2.0;
if (t > 0 && t < currentDist)
leadIn = leadIn.Scale(t / currentDist);
}
}
}
}
// Get the pierce point (in local space)
var piercePoint = leadIn.GetPiercePoint(snapPoint, snapNormal);
var worldPierce = TransformToWorld(piercePoint);