Arch In Rectangle
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Create a historically common arch shape within a rectangle. The geometric definition of most arch types includes an angle, which controls some crucial aspect of the shape. Note that the angle will mean very different things for different arch types, so an angle which works well for Trefoil arches will yield very awkward results for Horseshoe arches.
| Value | Name | Info |
|---|---|---|
0 |
Flat | An arch with a horizontal and flat top. Arguably not an arch at all. The angle parameter is ignored. |
1 |
Triangular | An arch with a triangular top. The angle parameter is the tip angle; 180° gives a flat top, lower values give a sharper point. |
2 |
Round | An arch with a semi circular top, which is tangent to both sides. The angle parameter is ignored. |
3 |
Segmental | An arch with a partial circular top. The angle parameter is the arc sweep; 180° gives a round arch and 0° degenerates to flat. |
4 |
Horseshoe | An arch with a circular top extending past vertical. 180° gives a round arch, lower values give a more pronounced horseshoe. Limited by the rectangle dimensions. |
5 |
Three pointed | An arch with two circular arcs meeting at a point. The angle parameter is the tip angle; 180° gives a round arch, lower values give a sharper point. |
6 |
Tudor | A four−centred arch composed of paired tangent arcs per side. The angle parameter is the apex tip angle; 180° gives a round arch. |
7 |
Ogee | A pointed arch with S−curved sides; each side is a concave arc joined tangentially to a convex arc. The angle parameter is the apex tip angle. |
8 |
Trefoil | An arch from three circular arcs. The angle parameter is the angle between adjacent arcs; 180° gives a round arch. |
9 |
Cinquefoil | An arch from five circular arcs. The angle parameter is the angle between adjacent arcs; 180° gives a round arch. |
