/// <summary>
///
/// </summary>
/// <param name="p_spriteObj"></param>
/// <param name="p_sprite"></param>
/// <param name="p_point1"></param>
/// <param name="p_point2"></param>
/// <returns></returns>
public OneCut.CutResult CutSpriteToMesh(OneCutObject p_spriteObj, Vector2 selfPos, Vector2 p_point1, Vector2 p_point2)
{
List <Triangle> exp_trig = new List <Triangle>(p_spriteObj.triangles);
List <Vector2> intersectionPoints = new List <Vector2>();
Sprite sprite = p_spriteObj.sprite;
Vector2[] vertices = p_spriteObj.meshVert;
VerticesSegmentor verticesSegmentor = new VerticesSegmentor(p_point1, p_point2);
for (int i = 0; i < exp_trig.Count; i++)
{
if (exp_trig[i].pairs.Count == 3)
{
HandleTrigIntersection(intersectionPoints, exp_trig[i], verticesSegmentor, selfPos, p_point1, p_point2);
}
}
List <Triangle> newTrigCol = TrigBuilder.Build(exp_trig);
//always contain 2 trig result
var segmentResult = ResegmentTriangle(newTrigCol, verticesSegmentor, selfPos);
return(new OneCut.CutResult(
GetSprite(segmentResult[0]),
GetSprite(segmentResult[1]),
GetSprite(exp_trig),
intersectionPoints
));
//ResegmentVertices(vertices, verticesSegmentor);
}
/// <summary>
/// Segment raw triangles into two according to cutting line
/// </summary>
/// <param name="p_triangles"></param>
/// <param name="verticesSegmentor"></param>
/// <returns></returns>
private List <Triangle>[] ResegmentTriangle(List <Triangle> p_triangles, VerticesSegmentor verticesSegmentor, Vector2 selfPos)
{
List <Triangle> segmentOne = new List <Triangle>();
List <Triangle> segmentTwo = new List <Triangle>();
float segmentA_area = 0, segmentB_area = 0;
for (int i = 0; i < p_triangles.Count; i++)
{
if (verticesSegmentor.CompareInputWithAverageLine(p_triangles[i].center + selfPos))
{
p_triangles[i].segmentID = "A";
segmentA_area += p_triangles[i].area;
segmentOne.Add(p_triangles[i]);
}
else
{
p_triangles[i].segmentID = "B";
segmentB_area += p_triangles[i].area;
segmentTwo.Add(p_triangles[i]);
}
}
List <Triangle> mainTrig = (segmentA_area > segmentB_area) ? segmentOne : segmentTwo;
List <Triangle> subTrig = (mainTrig == segmentOne) ? segmentTwo : segmentOne;
return(new List <Triangle>[] { mainTrig, subTrig });
}
private Triangle.Fragment FindVerticesSegment(VerticesSegmentor verticesSegmentor, Vector2 vertices, Vector2 worldVert)
{
//Triangle.Fragment fragment = new Triangle.Fragment(vertices,);
string segmentID = (verticesSegmentor.CompareInputWithAverageLine(worldVert)) ? "A" : "B";
Triangle.Fragment fragment = new Triangle.Fragment(vertices, segmentID, Triangle.Fragment.Type.Original);
return(fragment);
}
private void HandleTrigIntersection(List <Vector2> intersectList, Triangle triangle, VerticesSegmentor verticesSegmentor, Vector2 selfPos, Vector2 p_pointA, Vector2 p_pointB)
{
int pairNum = triangle.pairs.Count;
for (int i = pairNum - 1; i >= 0; i--)
{
TrigPairs pair = triangle.pairs[i];
Vector2 point = AddIntersectPoint(
pair.nodeA + selfPos,
pair.nodeB + selfPos,
p_pointA, p_pointB
);
//Intersection has occur
if (!point.Equals(Vector2.positiveInfinity))
{
Triangle.Fragment fragmentA = FindVerticesSegment(verticesSegmentor, pair.nodeA, pair.nodeA + selfPos);
Triangle.Fragment fragmentB = FindVerticesSegment(verticesSegmentor, pair.nodeB, pair.nodeB + selfPos);
Triangle.Fragment fragmentC = new Triangle.Fragment(point - selfPos, "", Triangle.Fragment.Type.Cutted);
triangle.AddFragment(new Triangle.Fragment[] { fragmentA, fragmentB, fragmentC });
intersectList.Add(point);
}
}
}