// 规范地讲 round时其实只需要一个半径
public static void Round(ref CornerInfo cornerInfo, Vector3 center, Vector3 arcPoint1, Vector3 arcPoint2)
{
cornerInfo.isRounded = true;
cornerInfo.arcCenter = center;
cornerInfo.arcPoint1 = arcPoint1;
cornerInfo.arcPoint2 = arcPoint2;
}
private static void AnglesToArcs(CornerRounderContext context)
{
PrepareRadiusInfo(context);
CornerRounderConfig config = context.config;
RadiusStrategy strategy = config.radiusStrategy;
if (strategy == RadiusStrategy.Never)
{
return;
}
LinkedList <CornerInfo> cornerInfo = context.cornerInfo;
LinkedListNode <CornerInfo> current = cornerInfo.First;
while (current != null)
{
if (current.Previous != null && current.Next != null)
{
CornerInfo c0 = current.Previous.Value;
CornerInfo c1 = current.Value;
CornerInfo c2 = current.Next.Value;
Vector3 p0 = c0.vertex;
Vector3 p1 = c1.vertex;
Vector3 p2 = c2.vertex;
float radius = c1.radiusAdjusted;
if (radius != 0)
{
float halfAngle = c1.angle * 0.5f;
float tan = Mathf.Tan(halfAngle);
float cutLen = radius / tan;
// 截断点
Vector3 cut1 = p1 + (p0 - p1).normalized * cutLen;
Vector3 cut2 = p1 + (p2 - p1).normalized * cutLen;
// 顶点到圆心距离
float vertexToCenter = radius / Mathf.Sin(halfAngle);
// 圆心
Vector3 center = ((cut1 - p1) + (cut2 - p1)).normalized * vertexToCenter + p1;
CornerInfo value = current.Value;
CornerInfo.Round(ref value, center, cut1, cut2);
current.Value = value;
}
}
current = current.Next;
}
}
public static void EnsureNeighbourInfo(ref CornerInfo first, ref CornerInfo second)
{
//if (first.toNext.dirty || second..toPrevious.dirty)
{
float dist = Vector3.Distance(first.vertex, second.vertex);
first.toNext.distance = second.toPrevious.distance = dist;
first.toNext.direction = second.vertex - first.vertex;
second.toPrevious.direction = first.vertex - second.vertex;
first.toNext.dirty = false;
second.toPrevious.dirty = false;
}
}
private static bool RadiusAdjust(ref CornerInfo c0, ref CornerInfo c1, ref CornerInfo c2)
{
float radiusExpected = c1.radiusExpected;
CornerInfo.EnsureNeighbourInfo(ref c0, ref c1);
CornerInfo.EnsureNeighbourInfo(ref c1, ref c2);
float angle = c1.angle;
float tanHalf = Mathf.Tan(angle * 0.5f);
float radiusAdjusted = Mathf.Min(
radiusExpected,
c1.toPrevious.distance * 0.5f * tanHalf,
c1.toNext.distance * 0.5f * tanHalf);
c1.radiusAdjusted = Mathf.Max(radiusAdjusted, 0);
/*
*
* bool isEnough0 = c1.previous.distance > c0.radiusExpected + c1.radiusExpected;
* bool isEnough2 = c1.next.distance > c2.radiusExpected + c1.radiusExpected;
*
*
* // 两边的距离都充足
* if (isEnough0 && isEnough2)
* {
* c1.radiusAdjusted = c1.radiusExpected;
* return false;
* }
*
* float radiusCorner0 = (c0.radiusAdjusted == CornerInfo.Uninitiated) ? 0 : c0.radiusAdjusted;
* float radiusCorner2 = (c2.radiusAdjusted == CornerInfo.Uninitiated) ? 0 : c2.radiusAdjusted;
*
* float radiusP = Mathf.Clamp(radiusExpected, 0, c1.previous.distance - radiusCorner0);
* float radiusN = Mathf.Clamp(radiusExpected, 0, c1.next.distance - radiusCorner2);
*
* float radiusAdjusted = Mathf.Min(radiusP, radiusN);
* c1.radiusAdjusted = radiusAdjusted;
* c0.radiusAdjusted = (c0.radiusAdjusted == CornerInfo.Uninitiated) ? radiusAdjusted : c0.radiusAdjusted;
* c2.radiusAdjusted = (c2.radiusAdjusted == CornerInfo.Uninitiated) ? radiusAdjusted : c2.radiusAdjusted;
*
*/
return(false);
}
private static void RemoveAcuteAngle(CornerRounderContext context)
{
CornerRounderConfig config = context.config;
if (config.acuteAngleStrategy == AcuteAngleStrategy.Keep)
{
return;
}
LinkedList <CornerInfo> cornerInfo = context.cornerInfo;
LinkedListNode <CornerInfo> current = cornerInfo.First;
float acuteAngle = Mathf.Deg2Rad * config.acuteAngleThreshold;
// 填充corner 同时填充angle
while (current != null)
{
if (current.Previous == null || current.Next == null)
{
current = current.Next;
continue;
}
CornerInfo corner = current.Value;
corner.angle = MathUtils.Angle(
current.Previous.Value.vertex,
current.Value.vertex,
current.Next.Value.vertex);
current.Value = corner;
if (corner.angle <= acuteAngle)
{
var toRemove = current;
current = current.Previous;
cornerInfo.Remove(toRemove);
continue;
}
current = current.Next;
}
}
public static void Round(ref CornerInfo cornerInfo, float radius)
{
float angle = cornerInfo.angle;
float halfAngle = angle * 0.5f;
float tan = Mathf.Tan(halfAngle);
float cutLen = radius / tan;
/*
*
* // 截断点
* Vector3 cut1 = p1 + (p0 - p1).normalized * cutLen;
* Vector3 cut2 = p1 + (p2 - p1).normalized * cutLen;
*
* // 顶点到圆心距离
* float vertexToCenter = radius / Mathf.Sin(halfAngle);
*
* // 圆心
* Vector3 center = ((cut1 - p1) + (cut2 - p1)).normalized * vertexToCenter + p1;
* CornerInfo value = current.Value;
* CornerInfo.Round(ref value, center, cut1, cut2);
*
*/
}
public static void ArcToPoints(CornerInfo corner, float step, IList <Vector3> points)
{
Vector3 cut1 = corner.arcPoint1;
Vector3 cut2 = corner.arcPoint2;
Vector3 center = corner.arcCenter;
Vector3 vec1 = cut1 - center;
Vector3 vec2 = cut2 - center;
step = Mathf.Clamp(step, 0.001f, 1);
float t = 0;
while (true)
{
points.Add(Vector3.Slerp(vec1, vec2, t) + center);
t += step;
if (t > 1)
{
points.Add(Vector3.Slerp(vec1, vec2, t) + center);
break;
}
}
}
private static void PrepareRadiusInfo(CornerRounderContext context)
{
CornerRounderConfig config = context.config;
RadiusStrategy strategy = config.radiusStrategy;
if (strategy == RadiusStrategy.Never)
{
return;
}
LinkedList <CornerInfo> cornerInfo = context.cornerInfo;
LinkedListNode <CornerInfo> current = cornerInfo.First;
while (current != null)
{
if (current.Previous != null && current.Next != null)
{
CornerInfo info = current.Value;
float angle = MathUtils.Angle(current.Previous.Value, current.Value, current.Next.Value);
info.angle = angle;
switch (strategy)
{
case RadiusStrategy.Unified:
info.radiusExpected = config.radiusTarget;
break;
case RadiusStrategy.Adaptive:
info.radiusExpected = Mathf.Lerp(config.radiusMin, config.radiusMax, angle / 3.14f);
break;
}
current.Value = info;
}
current = current.Next;
}
// 重置 再循环一遍
current = cornerInfo.First;
while (current != null)
{
if (current.Previous != null && current.Next != null)
{
CornerInfo c0 = current.Previous.Value;
CornerInfo c1 = current.Value;
CornerInfo c2 = current.Next.Value;
bool previousIsDirty = RadiusAdjust(ref c0, ref c1, ref c2);
current.Previous.Value = c0;
current.Value = c1;
current.Next.Value = c2;
if (previousIsDirty)
{
current = current.Previous;
}
}
current = current.Next;
}
}