private void UpdateVertices()
{
m_orientedRect2D = new OrientedRect2D(rectTransform);
var rect = rectTransform.rect;
rect.xMin += padding.left;
rect.yMax -= padding.top;
rect.xMax -= padding.right;
rect.yMin += padding.bottom;
m_offsetedOrientedRect2D = new OrientedRect2D((Vector2)rectTransform.position + Vector2.Scale(rect.center, rectTransform.lossyScale)
, Vector2.Scale(rect.size, rectTransform.lossyScale)
, rectTransform.rotation
);
if (m_vertices == null)
{
m_vertices = new List <UIVertex>(30);
}
else
{
m_vertices.Clear();
}
var rectVertices = GetVertices(m_orientedRect2D).ToArray();
var rectOffsetedVertices = GetVertices(m_offsetedOrientedRect2D).ToArray();
if (!VertexUtility.IsDegeneracy(rectOffsetedVertices[0], rectOffsetedVertices[1], rectOffsetedVertices[2]))
{
m_vertices.Add(CreateUIVertex(rectOffsetedVertices[0], 1.0f));
m_vertices.Add(CreateUIVertex(rectOffsetedVertices[1], 1.0f));
m_vertices.Add(CreateUIVertex(rectOffsetedVertices[2], 1.0f));
}
if (!VertexUtility.IsDegeneracy(rectOffsetedVertices[0], rectOffsetedVertices[2], rectOffsetedVertices[3]))
{
m_vertices.Add(CreateUIVertex(rectOffsetedVertices[0], 1.0f));
m_vertices.Add(CreateUIVertex(rectOffsetedVertices[2], 1.0f));
m_vertices.Add(CreateUIVertex(rectOffsetedVertices[3], 1.0f));
}
for (int i = 0, iMax = 4; i < iMax; ++i)
{
var iNext = i + 1;
if (iMax <= iNext)
{
iNext = 0;
}
if (!VertexUtility.IsDegeneracy(rectVertices[i], rectVertices[iNext], rectOffsetedVertices[i]))
{
m_vertices.Add(CreateUIVertex(rectVertices[i], 0.0f));
m_vertices.Add(CreateUIVertex(rectVertices[iNext], 0.0f));
m_vertices.Add(CreateUIVertex(rectOffsetedVertices[i], 1.0f));
}
if (!VertexUtility.IsDegeneracy(rectVertices[iNext], rectOffsetedVertices[iNext], rectOffsetedVertices[i]))
{
m_vertices.Add(CreateUIVertex(rectVertices[iNext], 0.0f));
m_vertices.Add(CreateUIVertex(rectOffsetedVertices[iNext], 1.0f));
m_vertices.Add(CreateUIVertex(rectOffsetedVertices[i], 1.0f));
}
}
}
public bool Overlaps(OrientedRect2D other)
{
var distanceAxis = position - other.position;
var thisUnitAxis = new AxisPack3(rotation);
var thisExtentsAxis = new AxisPack3(extents, rotation);
var otherUnitAxis = new AxisPack3(other.rotation);
var otherExtentsAxis = new AxisPack3(other.extents, other.rotation);
//this
for (int i = 0, iMax = 2; i < iMax; ++i)
{
var splitAxis = thisUnitAxis[i];
var distance = GetVectorLengthOfProjection(distanceAxis, splitAxis);
distance -= this.extents[i];
distance -= GetVectorLengthOfProjection(otherExtentsAxis, splitAxis);
if (0.0f < distance)
{
//NoHit
return(false);
}
}
//other
for (int i = 0, iMax = 2; i < iMax; ++i)
{
var splitAxis = otherUnitAxis[i];
var distance = GetVectorLengthOfProjection(distanceAxis, splitAxis);
distance -= GetVectorLengthOfProjection(thisExtentsAxis, splitAxis);
distance -= other.extents[i];
if (0.0f < distance)
{
//NoHit
return(false);
}
}
//3rd split axis
for (int i = 0, iMax = 2; i < iMax; ++i)
{
for (int k = 0, kMax = 2; k < kMax; ++k)
{
var splitAxis = Vector3.Cross(thisUnitAxis[i], otherUnitAxis[k]);
var distance = GetVectorLengthOfProjection(distanceAxis, splitAxis);
distance -= GetVectorLengthOfProjection(thisExtentsAxis, splitAxis);
distance -= GetVectorLengthOfProjection(otherExtentsAxis, splitAxis);
if (0.0f < distance)
{
//NoHit
return(false);
}
}
}
//Hit
return(true);
}
private static IEnumerable <Vector2> GetVertices(OrientedRect2D orientedRect)
{
var rotatedExtents = (Vector2)(orientedRect.rotation * orientedRect.extents);
for (int i = 0, iMax = 4; i < iMax; ++i)
{
var sign = new Vector2(((((i ^ (i >> 1)) & 0x1) == 0)? 1.0f: -1.0f), (((i >> 1) == 0)? 1.0f: -1.0f)); //xy:[++, -+, --, +-]
yield return(orientedRect.position + Vector2.Scale(rotatedExtents, sign));
}
yield break;
}
public OrientedRect2D(OrientedRect2D source)
{
this.position = source.position;
this.extents = source.extents;
this.rotation = source.rotation;
}
