public virtual bool CreateMetaball(float radius1, Vector2 center1)
{
var distance = Vector2.Distance(center1, Center);
float u1;
float u2;
// Check if balls are intersecting
if (distance > (Attached ? 100 : distanceBeforeDissolve) ||
distance <= Mathf.Abs(radius1 - ballRadius))
{
return(false);
}
if (distance < radius1 + ballRadius)
{
// case circles are overlapping
u1 = Mathf.Acos((radius1 * radius1 + distance * distance - ballRadius * ballRadius) /
(2 * radius1 * distance));
u2 = Mathf.Acos((ballRadius * ballRadius + distance * distance - radius1 * radius1) /
(2 * ballRadius * distance));
}
else
{
u1 = 0;
u2 = 0;
}
// Calculate all angles needed
var angleBetweenCenters = AngleBetweenCenters(Center, center1);
var maxSpread = Mathf.Acos((radius1 - ballRadius) / distance);
// Circle 1 (left)
var angle1 = angleBetweenCenters + u1 + (maxSpread - u1) * v;
var angle2 = angleBetweenCenters - (u1 + (maxSpread - u1) * v);
// Circle 2 (right)
var angle3 = angleBetweenCenters + Mathf.PI - u2 - (Mathf.PI - u2 - maxSpread) * v;
var angle4 = angleBetweenCenters - (Mathf.PI - u2 - (Mathf.PI - u2 - maxSpread) * v);
// Calculate the four bezier points
var point1 = GetPoint(center1, angle1, radius1);
var point2 = GetPoint(center1, angle2, radius1);
var point3 = GetPoint(Center, angle3, ballRadius);
var point4 = GetPoint(Center, angle4, ballRadius);
// Calculate the four handles
var totalRadius = radius1 + ballRadius;
var d2 = Mathf.Min(v * 10, Vector2.Distance(point1, point3) / totalRadius);
var r1 = radius1 * d2;
var r2 = ballRadius * d2;
var handle1 = GetPoint(point1, angle1 - Mathf.PI / 2, r1);
var handle2 = GetPoint(point2, angle2 + Mathf.PI / 2, r1);
var handle3 = GetPoint(point3, angle3 + Mathf.PI / 2, r2);
var handle4 = GetPoint(point4, angle4 - Mathf.PI / 2, r2);
// Define the bezier segments
if (BezierCurveUtils.CheckIBezierCurveIntersection(
new BezierSegment {
P0 = point1, P1 = handle1, P2 = handle3, P3 = point3
},
new BezierSegment {
P0 = point2, P1 = handle2, P2 = handle4, P3 = point4
}))
{
return(false);
}
var bezierSegments = new[]
{
new BezierPathSegment
{
P0 = point1 - (Vector2)transform.parent.position,
P1 = handle1 - (Vector2)transform.parent.position,
P2 = handle3 - (Vector2)transform.parent.position
},
new BezierPathSegment
{
P0 = point3 - (Vector2)transform.parent.position,
P1 = point3 - (Vector2)transform.parent.position,
P2 = point4 - (Vector2)transform.parent.position
},
new BezierPathSegment
{
P0 = point4 - (Vector2)transform.parent.position,
P1 = handle4 - (Vector2)transform.parent.position,
P2 = handle2 - (Vector2)transform.parent.position
},
new BezierPathSegment
{
P0 = point2 - (Vector2)transform.parent.position,
P1 = point2 - (Vector2)transform.parent.position,
P2 = point1 - (Vector2)transform.parent.position
}
};
// Define the bezier contour for the shape
var bezierContour = new BezierContour
{
Segments = bezierSegments,
Closed = false
};
// Unite everything together
GenerateBezierCurve(new[] { bezierContour });
return(true);
}
public override bool CreateMetaball(float radius1, Vector2 center1)
{
var distance = Vector2.Distance(center1, center);
float u1;
var point1 = GameFieldManager.Instance.GetPointOnWall(point1Index);
var point2 = GameFieldManager.Instance.GetPointOnWall(point2Index);
var perpendicularLine = Vector2.Perpendicular(point1 - point2);
var point5 = center1 + perpendicularLine.normalized * radius1;
// Check if balls are intersecting
if (distance > (Attached ? 100 : distanceBeforeDissolve))
{
return(false);
}
if (distance < radius1 + ballRadius)
{
if (CheckSide(point2, point1, point5) > 0)
{
return(false);
}
// case circles are overlapping
u1 = Mathf.Acos((radius1 * radius1 + distance * distance - ballRadius * ballRadius) /
(2 * radius1 * distance));
}
else
{
if (CheckSide(point2, point1, point5) > 0)
{
return(false);
}
u1 = 0;
}
// Calculate all angles needed
var angleBetweenCenters = AngleBetweenCenters(center, center1);
var maxSpread = Mathf.Acos((radius1 - ballRadius) / distance);
// Circle 1 (left)
var angle1 = angleBetweenCenters + u1 + (maxSpread - u1) * v;
var angle2 = angleBetweenCenters - (u1 + (maxSpread - u1) * v);
// Calculate the four bezier points
var point3 = GetPoint(center1, angle1, radius1);
var point4 = GetPoint(center1, angle2, radius1);
var tangentPoint1 = GameFieldManager.Instance.GetPointOnWall(point1Index - 1);
var tangentPoint2 = GameFieldManager.Instance.GetPointOnWall(point2Index + 1);
// Calculate the four handles
var totalRadius = radius1 + ballRadius;
var d2 = Mathf.Min(v * 10f, Vector2.Distance(point1, point3) / totalRadius);
if (float.IsNaN(d2))
{
d2 = lastD2;
}
lastD2 = d2;
var r1 = radius1 * d2;
var r2 = ballRadius * d2;
// Handle point 1 Right surface
var handle1 = GetPoint(point1, AngleBetweenCenters(tangentPoint1, point1), r1);
// Handle point 2 Left surface
var handle2 = GetPoint(point2, AngleBetweenCenters(tangentPoint2, point2), r1);
// Handle point 3 Right Ball
var handle3 = GetPoint(point3, angle1 - Mathf.PI / 2, r2);
// Handle point 4 Left Ball
var handle4 = GetPoint(point4, angle2 + Mathf.PI / 2, r2);
// Handle point 5 Right
var handle5 = point5 + Vector2.Perpendicular(point5).normalized *radius1;
// Handle point 5 Left
var handle6 = point5 - Vector2.Perpendicular(point5).normalized *radius1;
// Define the bezier segments
var numberOfPoints = point1Index - point2Index;
int index;
BezierPathSegment[] bezierSegments;
if (distance <= Mathf.Abs(radius1 - ballRadius))
{
bezierSegments = new BezierPathSegment[2 + numberOfPoints];
// return true;
bezierSegments[0] = new BezierPathSegment
{
P0 = point1,
P1 = handle1,
P2 = handle5
};
bezierSegments[1] = new BezierPathSegment
{
P0 = point5,
P1 = handle6,
P2 = handle2
};
index = 2;
}
else
{
if (BezierCurveUtils.CheckIBezierCurveIntersection(
new BezierSegment {
P0 = point1, P1 = handle1, P2 = handle3, P3 = point3
},
new BezierSegment {
P0 = point2, P1 = handle2, P2 = handle4, P3 = point4
}))
{
return(false);
}
bezierSegments = new BezierPathSegment[3 + numberOfPoints];
bezierSegments[0] = new BezierPathSegment
{
P0 = point1,
P1 = handle1,
P2 = handle3
};
bezierSegments[1] = new BezierPathSegment
{
P0 = point3,
P1 = point3,
P2 = point4
};
bezierSegments[2] = new BezierPathSegment
{
P0 = point4,
P1 = handle4,
P2 = handle2
};
index = 3;
}
for (var i = 0; i < numberOfPoints; i++)
{
var bezierPointToAdd = GameFieldManager.Instance.GetPointOnWall(point2Index + i);
var nextBezierPoint = GameFieldManager.Instance.GetPointOnWall(point2Index + i + 1);
bezierSegments[index++] = new BezierPathSegment
{
P0 = bezierPointToAdd,
P1 = bezierPointToAdd,
P2 = nextBezierPoint
};
}
var bezierContour = new BezierContour
{
Segments = bezierSegments,
Closed = false
};
// Draw the bezier curve
GenerateBezierCurve(new[] { bezierContour });
return(true);
}