static void GenerateJoining(JoiningInfo joinInfo, PathCorner corner, float halfThickness, float tippedCornerLimit, TessellationOptions tessellateOptions, List <Vector2> verts, List <UInt16> inds)
{
// The joining generates the vertices at both ends as well as the joining itself
if (verts.Count == 0)
{
// Starting a path with a joining (meaning a loop)
verts.Add(joinInfo.RoundPosThickness ? joinInfo.PosThicknessEnd : joinInfo.InnerCornerVertex);
verts.Add(joinInfo.RoundPosThickness ? joinInfo.InnerCornerVertex : joinInfo.NegThicknessEnd);
}
System.Diagnostics.Debug.Assert(verts.Count >= 2);
int indexStart = verts.Count - 2; // Using the last two vertices
// Convert a tipped corner to a beveled one if tippedCornerLimit ratio is reached
if (corner == PathCorner.Tipped && tippedCornerLimit >= 1.0f)
{
var theta = Vector2.Angle(-joinInfo.TanAtEnd, joinInfo.TanAtStart) * Mathf.Deg2Rad;
var ratio = 1.0f / Mathf.Sin(theta / 2.0f);
if (ratio > tippedCornerLimit)
{
corner = PathCorner.Beveled;
}
}
if (joinInfo.SimpleJoin)
{
// TODO
}
else if (corner == PathCorner.Tipped)
{
verts.Add(joinInfo.PosThicknessClosingPoint);
verts.Add(joinInfo.NegThicknessClosingPoint);
verts.Add(joinInfo.RoundPosThickness ? joinInfo.PosThicknessStart : joinInfo.InnerCornerVertex);
verts.Add(joinInfo.RoundPosThickness ? joinInfo.InnerCornerVertex : joinInfo.NegThicknessStart);
// Ending to tip
inds.Add((UInt16)(indexStart + 0));
inds.Add((UInt16)(indexStart + 3));
inds.Add((UInt16)(indexStart + 1));
inds.Add((UInt16)(indexStart + 0));
inds.Add((UInt16)(indexStart + 2));
inds.Add((UInt16)(indexStart + 3));
// Tip to starting
inds.Add((UInt16)(indexStart + 4));
inds.Add((UInt16)(indexStart + 3));
inds.Add((UInt16)(indexStart + 2));
inds.Add((UInt16)(indexStart + 4));
inds.Add((UInt16)(indexStart + 5));
inds.Add((UInt16)(indexStart + 3));
return;
}
else if (corner == PathCorner.Beveled)
{
verts.Add(joinInfo.RoundPosThickness ? joinInfo.PosThicknessEnd : joinInfo.InnerCornerVertex); // 2
verts.Add(joinInfo.RoundPosThickness ? joinInfo.InnerCornerVertex : joinInfo.NegThicknessEnd); // 3
verts.Add(joinInfo.RoundPosThickness ? joinInfo.PosThicknessStart : joinInfo.InnerCornerVertex); // 4
verts.Add(joinInfo.RoundPosThickness ? joinInfo.InnerCornerVertex : joinInfo.NegThicknessStart); // 5
// Ending to tip
inds.Add((UInt16)(indexStart + 0));
inds.Add((UInt16)(indexStart + 2));
inds.Add((UInt16)(indexStart + 1));
inds.Add((UInt16)(indexStart + 1));
inds.Add((UInt16)(indexStart + 2));
inds.Add((UInt16)(indexStart + 3));
// Bevel
if (joinInfo.RoundPosThickness)
{
inds.Add((UInt16)(indexStart + 2));
inds.Add((UInt16)(indexStart + 4));
inds.Add((UInt16)(indexStart + 3));
}
else
{
inds.Add((UInt16)(indexStart + 3));
inds.Add((UInt16)(indexStart + 2));
inds.Add((UInt16)(indexStart + 5));
}
return;
}
if (corner == PathCorner.Round)
{
float sweepAngle = Mathf.Acos(Vector2.Dot(joinInfo.NormAtEnd, joinInfo.NormAtStart));
bool flipArc = false;
if (!PointOnTheLeftOfLine(Vector2.zero, joinInfo.NormAtEnd, joinInfo.NormAtStart))
{
sweepAngle = -sweepAngle;
flipArc = true;
}
UInt16 innerCornerVertexIndex = (UInt16)verts.Count;
verts.Add(joinInfo.InnerCornerVertex);
int arcSegments = CalculateArcSteps(halfThickness, 0, sweepAngle, tessellateOptions);
for (int i = 0; i <= arcSegments; i++)
{
float angle = sweepAngle * (i / (float)arcSegments);
Vector2 nrm = Matrix2D.RotateLH(angle) * joinInfo.NormAtEnd;
if (flipArc)
{
nrm = -nrm;
}
verts.Add(nrm * halfThickness + joinInfo.JoinPos);
if (i == 0)
{
inds.Add((UInt16)(indexStart + 0));
inds.Add((UInt16)(indexStart + 3));
inds.Add((UInt16)(indexStart + (joinInfo.RoundPosThickness ? 2 : 1)));
inds.Add((UInt16)(indexStart + 0));
inds.Add((UInt16)(indexStart + 2));
inds.Add((UInt16)(indexStart + (joinInfo.RoundPosThickness ? 1 : 3)));
}
else
{
if (joinInfo.RoundPosThickness)
{
inds.Add((UInt16)(indexStart + i + (flipArc ? 3 : 2)));
inds.Add((UInt16)(indexStart + i + (flipArc ? 2 : 3)));
inds.Add(innerCornerVertexIndex);
}
else
{
inds.Add((UInt16)(indexStart + i + (flipArc ? 3 : 2)));
inds.Add((UInt16)(indexStart + i + (flipArc ? 2 : 3)));
inds.Add(innerCornerVertexIndex);
}
}
}
// Manually add the last segment, maintain the expected vertex positioning
int endingVerticesIndex = verts.Count;
if (joinInfo.RoundPosThickness)
{
verts.Add(joinInfo.PosThicknessStart);
verts.Add(joinInfo.InnerCornerVertex);
}
else
{
verts.Add(joinInfo.InnerCornerVertex);
verts.Add(joinInfo.NegThicknessStart);
}
inds.Add((UInt16)(endingVerticesIndex - 1));
inds.Add((UInt16)(endingVerticesIndex + 0));
inds.Add(innerCornerVertexIndex);
}
}
private static void BuildTestColumnWithProperties(float x, float width, PathEnding ending, PathCorner corners, VectorUtils.TessellationOptions options)
{
var sprites = new List <Sprite>();
var angles = new float[] {
-Mathf.PI + Mathf.PI / 8,
-Mathf.PI + Mathf.PI / 4,
Mathf.PI - Mathf.PI / 4,
Mathf.PI - Mathf.PI / 8
};
foreach (var angle in angles)
{
var path = LinesWithAngle(angle, width);
var pathProps = path.PathProps;
pathProps.Head = ending;
pathProps.Tail = ending;
pathProps.Corners = corners;
path.PathProps = pathProps;
var geoms = new List <VectorUtils.Geometry>();
TessellatePath(path.Contours[0], path.PathProps, geoms, options);
sprites.Add(SpriteFromGeometry(geoms));
}
var pos = new Vector2(x, 0.0f);
foreach (var sprite in sprites)
{
var go = new GameObject("Path");
go.transform.position = pos;
var sr = go.AddComponent <SpriteRenderer>();
sr.sprite = sprite;
pos.y += 0.25f;
}
}
