protected override void UpdateRenderPoints()
{
// TODO
// Dirty system
ComputeLayout();
RenderPoints.Clear();
m_LineSegmentIndex.Clear();
Vector2 p0 = parent.ChangeCoordinatesTo(this, from);
Vector2 p3 = parent.ChangeCoordinatesTo(this, to);
for (var index = 0; index < m_BezierSegments.Count; index++)
{
var bezierSegment = m_BezierSegments[index];
m_LineSegmentIndex.Add(RenderPoints.Count);
Vector2 p1 = parent.ChangeCoordinatesTo(this, bezierSegment.m_P1);
Vector2 p2 = parent.ChangeCoordinatesTo(this, bezierSegment.m_P2);
p3 = parent.ChangeCoordinatesTo(this, bezierSegment.m_P3);
int deepness = 0;
GenerateRenderPoints(p0, p1, p2, p3, deepness);
p0 = p3;
}
RenderPoints.Add(p3);
m_LineSegmentIndex.Add(RenderPoints.Count);
}
void GenerateRenderPoints(Vector2 p0, Vector2 p1, Vector2 p2, Vector2 p3, int deepness)
{
if (StraightEnough(p0, p1, p2, p3) || deepness > 6)
{
RenderPoints.Add(p0);
return;
}
// DeCasteljau algorithm.
var midpoint = (p1 + p2) * 0.5f;
var left1 = (p0 + p1) * 0.5f;
var right2 = (p2 + p3) * 0.5f;
var left2 = (left1 + midpoint) * 0.5f;
var right1 = (right2 + midpoint) * 0.5f;
var split = (left2 + right1) * 0.5f;
GenerateRenderPoints(p0, left1, left2, split, deepness + 1);
GenerateRenderPoints(split, right1, right2, p3, deepness + 1);
}
