private void Draw(WriteableBitmap writeableBmp, Branch branch)
{
int[] pts = new int[]
{
branch.Start.X, branch.Start.Y,
branch.Middle.X, branch.Middle.Y,
branch.End.X, branch.End.Y,
};
// Draw with cardinal spline
writeableBmp.DrawCurve(pts, Tension, this.Color);
foreach (var b in branch.Branches)
{
Draw(writeableBmp, b);
}
}
private void Grow(Branch branch, int generation)
{
if (generation <= MaxGenerations)
{
if (branch.End.Y >= 0 && branch.End.Y <= MaxHeight
&& branch.End.X >= 0 && branch.End.X <= MaxWidth)
{
// Grow it
branch.Grow();
// Branch?
foreach (var bp in BranchPoints)
{
if (!branchesPerGen.ContainsKey(generation))
{
branchesPerGen.Add(generation, 0);
}
if (branchesPerGen[generation] < MaxBranchesPerGeneration)
{
if (branch.Life >= bp.Time && branch.Life <= bp.Time + branch.GrowthRate)
{
// Length and angle of the branch
var branchLen = rand.Next(BranchLenMin, BranchLenMax);
branchLen -= (int)(branchLen * 0.01f * generation);
// In radians
var angle = rand.Next(bp.Angle - BranchAngleVariance, bp.Angle + BranchAngleVariance) * 0.017453292519943295769236907684886;
// Desired end of new branch
var endTarget = new Vector(branch.End.X + ((int)(Math.Sin(angle) * branchLen) * Scale.X),
branch.End.Y + ((int)(Math.Cos(angle) * branchLen) * Scale.Y));
// Desired middle point
angle -= Math.Sign(bp.Angle) * BendingFactor;
var middleTarget = new Vector(endTarget.X - ((int)(Math.Sin(angle) * (branchLen >> 1)) * Scale.X),
endTarget.Y - ((int)(Math.Cos(angle) * (branchLen >> 1)) * Scale.Y));
// Add new branch
branch.Branches.Add(new Branch(branch.End, middleTarget, endTarget, GetRandomGrowthRate()));
branchesPerGen[generation]++;
}
}
}
}
// Grow the child branches
foreach (var b in branch.Branches)
{
Grow(b, generation+1);
}
}
}