private static Vector2 BezierCalculatorAdjustVector(float adjustment, BezierCalculatorControlPointDirection dir)
{
switch (dir)
{
case BezierCalculatorControlPointDirection.Down:
return(Utils.Down(adjustment));
case BezierCalculatorControlPointDirection.Up:
return(Utils.Up(adjustment));
case BezierCalculatorControlPointDirection.Left:
return(Utils.Left(adjustment));
case BezierCalculatorControlPointDirection.Right:
return(Utils.Right(adjustment));
case BezierCalculatorControlPointDirection.UpRight:
return(Utils.UpRight(adjustment));
case BezierCalculatorControlPointDirection.UpLeft:
return(Utils.UpLeft(adjustment));
case BezierCalculatorControlPointDirection.DownRight:
return(Utils.DownRight(adjustment));
case BezierCalculatorControlPointDirection.DownLeft:
return(Utils.DownLeft(adjustment));
}
return(new Vector2(0, 0));
}
public static CalcResult Calc(
float bezierLengthRequired,
Vector2 start,
Vector2 end,
BezierCalculatorControlPointDirection dir1,
BezierCalculatorControlPointDirection dir2,
Vector2 p1Adj = new Vector2(),
Vector2 p2Adj = new Vector2(),
int rangeMin = 1,
int rangeMax = 200)
{
if (layoutOnly)
{
return(new CalcResult());
}
int currentIterationValue = ((rangeMax - rangeMin) / 2) + rangeMin;
int previousIterationValue = 0;
CalcResult lengthFound = new CalcResult();
for (int i = 1; i < 51; i++)
{
lengthFound = CalcLength(start, end, dir1, dir2, p1Adj, p2Adj, currentIterationValue);
if (Math.Abs(bezierLengthRequired - lengthFound.FoundLength) <= 0.3F)
{
//System.Diagnostics.Debug.WriteLine(" BezierCalculator requiredLength=" + bezierLengthRequired + " foundLength=" + lengthFound.FoundLength + " i=" + i);
lengthFound.SolutionFound = true;
return(lengthFound);
}
if (lengthFound.FoundLength > bezierLengthRequired)
{
rangeMax = currentIterationValue;
}
if (lengthFound.FoundLength < bezierLengthRequired)
{
rangeMin = currentIterationValue;
}
currentIterationValue = ((rangeMax - rangeMin) / 2) + rangeMin;
if (currentIterationValue == previousIterationValue)
{
break;
}
previousIterationValue = currentIterationValue;
//System.Diagnostics.Debug.WriteLine("currentIterationValue="+currentIterationValue);
}
//System.Diagnostics.Debug.WriteLine(description + " Warning - BezierCalculator, no soltion found after 50 iterations");
lengthFound.SolutionFound = false;
return(lengthFound);// new CalcResult();
}
public static CalcResult CalcLength(
Vector2 start,
Vector2 end,
BezierCalculatorControlPointDirection dir1,
BezierCalculatorControlPointDirection dir2,
float p1Adj,
float p2Adj)
{
Vector2 firstpoint = BezierCalculatorAdjustVector(p1Adj, dir1);
Vector2 secondPoint = BezierCalculatorAdjustVector(p2Adj, dir2);
float foundLength = new PartEntityBezier(start, end, start + firstpoint, end + secondPoint).Length;
return(new CalcResult(firstpoint, secondPoint, foundLength));
}
private static CalcResult CalcLength(
Vector2 start,
Vector2 end,
BezierCalculatorControlPointDirection dir1,
BezierCalculatorControlPointDirection dir2,
Vector2 p1Adj,
Vector2 p2Adj,
int i)
{
Vector2 firstpoint = BezierCalculatorAdjustVector(i, dir1) + p1Adj;
Vector2 secondPoint = BezierCalculatorAdjustVector(i, dir2) + p2Adj;
float foundLength = new PartEntityBezier(start, end, start + firstpoint, end + secondPoint).Length;
return(new CalcResult(firstpoint, secondPoint, foundLength));
}