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feat: Add BlockRawFreeForgeRoundHeadDrawer class to implement drawing logic for free forge round head CAD blocks.

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sladro 2026-02-12 11:12:01 +08:00
parent 50a8e275dd
commit 2236372f05
1 changed files with 35 additions and 19 deletions
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54
Cad/BlockRawFreeForgeRoundHeadDrawer.cs
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@ -311,29 +311,45 @@ namespace CadParamPluging.Cad
double H = height;
double r = innerFilletR;
double xCurrentLeft = ox + arcHeight + r;
double xCurrentRight = ox + totalWidth - arcHeight - r;
double sagitta = arcHeight + r;
double halfChord = H / 2.0;
// Calculate geometric bounds
double xInnerLeft = ox + arcHeight;
double xInnerRight = ox + totalWidth - arcHeight;
double bulge = 0;
if (halfChord > 1e-3)
{
bulge = -(sagitta / halfChord);
}
double yBottomStraight = oy + r;
double yTopStraight = oy + H - r;
double chordLength = H - 2.0 * r;
if (chordLength < 0.1) return; // Should not happen for reasonable params
var poly = new Polyline();
double sagitta = arcHeight;
// Bulge calculation: bulge = 2 * sagitta / chord
// For a CCW arc, bulge is positive.
double bulge = (2.0 * sagitta) / chordLength;
poly.AddVertexAt(0, new Point2d(xCurrentRight, oy), 0, 0, 0);
poly.AddVertexAt(1, new Point2d(xCurrentLeft, oy), bulge, 0, 0);
poly.AddVertexAt(2, new Point2d(xCurrentLeft, oy + H), 0, 0, 0);
poly.AddVertexAt(3, new Point2d(xCurrentRight, oy + H), bulge, 0, 0);
poly.Closed = true;
// Left Arc: From Top to Bottom, bulging Left (CCW)
// Start: (xInnerLeft, yTopStraight)
// End: (xInnerLeft, yBottomStraight)
// Path: 12 o'clock -> 9 o'clock -> 6 o'clock direction is CCW.
var leftPoly = new Polyline();
leftPoly.AddVertexAt(0, new Point2d(xInnerLeft, yTopStraight), bulge, 0, 0);
leftPoly.AddVertexAt(1, new Point2d(xInnerLeft, yBottomStraight), 0, 0, 0);
ctx.Style?.Apply(leftPoly, DrawingStyleManager.Role.OutlineBold);
ctx.Btr.AppendEntity(leftPoly);
ctx.Tr.AddNewlyCreatedDBObject(leftPoly, true);
ctx.Style?.Apply(poly, DrawingStyleManager.Role.OutlineBold);
ctx.Btr.AppendEntity(poly);
ctx.Tr.AddNewlyCreatedDBObject(poly, true);
// Right Arc: From Bottom to Top, bulging Right (CCW)
// Start: (xInnerRight, yBottomStraight)
// End: (xInnerRight, yTopStraight)
// Path: 6 o'clock -> 3 o'clock -> 12 o'clock direction is CCW.
var rightPoly = new Polyline();
rightPoly.AddVertexAt(0, new Point2d(xInnerRight, yBottomStraight), bulge, 0, 0);
rightPoly.AddVertexAt(1, new Point2d(xInnerRight, yTopStraight), 0, 0, 0);
ctx.Style?.Apply(rightPoly, DrawingStyleManager.Role.OutlineBold);
ctx.Btr.AppendEntity(rightPoly);
ctx.Tr.AddNewlyCreatedDBObject(rightPoly, true);
}
catch { }
}