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namespace UnityEngine.UI
{
[RequireComponent(typeof(CanvasRenderer))]
public partial class RaycastOnlyPolygonGraphic : MaskableGraphic, ICanvasRaycastFilter
{
[SerializeField]
private List<Vector2> m_innerPoints;
public IReadOnlyList<Vector2> PointList => m_innerPoints;
public int PointCount => null == m_innerPoints ? 0 : m_innerPoints.Count;
public override void SetMaterialDirty() { return; }
public override void SetVerticesDirty() { return; }
public bool IsRaycastLocationValid(Vector2 screenPoint, Camera eventCamera)
{
if (RectTransformUtility.ScreenPointToLocalPointInRectangle(rectTransform, screenPoint, eventCamera, out Vector2 local))
{
Vector2 bottomLeft = GetLocalRectPosition(rectTransform, Vector2.zero);
Vector2 localDelta = new(local.x - bottomLeft.x, local.y - bottomLeft.y);
#if UNITY_EDITOR
Debug.DrawLine(rectTransform.TransformPoint(bottomLeft), rectTransform.TransformPoint(local), Color.red);
#endif
Rect rect = rectTransform.rect;
Vector2 normalizedLocalPoint = new(localDelta.x / rect.width, localDelta.y / rect.height);
bool result = RaycastCheckPointInPolygon(normalizedLocalPoint);
return result;
}
return false;
}
[ContextMenu(nameof(CreateNewPoint))]
public void CreateNewPoint()
{
m_innerPoints ??= new List<Vector2>();
if (2 > m_innerPoints.Count)
{
m_innerPoints.Add(Vector2.zero);
return;
}
int pointCount = m_innerPoints.Count;
Vector2 newPoint = m_innerPoints[pointCount - 1];
Vector2 tempDir = m_innerPoints[0] - m_innerPoints[pointCount - 1];
newPoint += 0.5f * tempDir;
m_innerPoints.Add(newPoint);
}
public Vector2 GetPoint(int index)
{
if (null == m_innerPoints)
{
return Vector2.zero;
}
return m_innerPoints[index];
}
public void SetPoint(int index, Vector2 point)
{
if (0 > index || m_innerPoints.Count <= index)
{
Debug.LogError($"Index {index} is out of range for points list.");
return;
}
m_innerPoints[index] = point;
}
protected override void OnPopulateMesh(VertexHelper vh)
{
vh.Clear();
}
private Vector2 GetLocalRectPosition(RectTransform target, Vector2 normalizedRectPosition)
{
Vector2 result = Vector2.zero;
Vector2 targetSize = target.rect.size;
Vector2 targetPivot = target.pivot;
Vector2 pivotOffset = Vector2.one * 0.5f - targetPivot;
pivotOffset.x *= targetSize.x;
pivotOffset.y *= targetSize.y;
result += pivotOffset;
result.x -= targetSize.x * 0.5f;
result.y -= targetSize.y * 0.5f;
result.x += normalizedRectPosition.x * targetSize.x;
result.y += normalizedRectPosition.y * targetSize.y;
return result;
}
private bool RaycastCheckPointInPolygon(Vector2 normalizedPoint)
{
int pointCount = m_innerPoints.Count;
if (3 > pointCount)
{
return false;
}
if (3 == pointCount)
{
return PointInTriangle
(
normalizedPoint,
m_innerPoints[0],
m_innerPoints[1],
m_innerPoints[2]
);
}
int intersectionCount = 0;
for (int i = 0, length = pointCount; i < length; i++)
{
Vector2 upPoint = m_innerPoints[i];
Vector2 downPoint = m_innerPoints[(i + 1) % length];
if (upPoint.y < downPoint.y)
{
(upPoint, downPoint) = (downPoint, upPoint);
}
Vector2 edge = new(1f, normalizedPoint.y);
if (Mathf.Max(upPoint.x, downPoint.x) < normalizedPoint.x ||
upPoint.y < normalizedPoint.y ||
downPoint.y > normalizedPoint.y)
{
continue;
}
Vector2 p2up = upPoint - normalizedPoint;
Vector2 down2up = upPoint - downPoint;
if ((Mathf.Approximately(upPoint.x, normalizedPoint.x) && Mathf.Approximately(upPoint.y, normalizedPoint.y)) ||
(Mathf.Approximately(downPoint.x, normalizedPoint.x) && Mathf.Approximately(downPoint.y, normalizedPoint.y)) ||
0 == Vector3.Cross(p2up, down2up).z)
{
return true;
}
Vector2 p2edge = edge - normalizedPoint;
Vector2 p2down = downPoint - normalizedPoint;
Vector3 cross1 = Vector3.Cross(p2up, p2edge);
Vector3 cross2 = Vector3.Cross(p2down, p2edge);
Vector2 edge2p = normalizedPoint - edge;
Vector2 edge2up = upPoint - edge;
Vector2 edge2down = downPoint - edge;
Vector3 cross3 = Vector3.Cross(edge2up, edge2p);
Vector3 cross4 = Vector3.Cross(edge2down, edge2p);
if (0 >= cross1.z * cross2.z &&
0 >= cross3.z * cross4.z &&
0 < Vector3.Cross(p2down, p2up).z)
{
intersectionCount++;
}
}
return intersectionCount % 2 == 1;
}
private bool PointInTriangle(Vector2 p, Vector2 a, Vector2 b, Vector2 c)
{
Vector3 p2a = a - p;
Vector3 p2b = b - p;
Vector3 p2c = c - p;
Vector3 cross1 = Vector3.Cross(p2a, p2b);
Vector3 cross2 = Vector3.Cross(p2b, p2c);
Vector3 cross3 = Vector3.Cross(p2c, p2a);
float dot1 = Vector3.Dot(cross1, cross2);
float dot2 = Vector3.Dot(cross2, cross3);
float dot3 = Vector3.Dot(cross3, cross1);
return dot1 >= 0 &&
dot2 >= 0 &&
dot3 >= 0;
}
}
}
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