private void BuildEye(float openAmount)
{
var count = 32;
var left = new Vector2(-100, 0);
var right = -left;
var basePull = new Vector2(0, openAmount);
var curves = new CatmullRomCurve[6];
// top curve
var topPull = basePull - lookOffset * 5 * openAmount;
curves[0] = CatmullRomCurve.Create(count,
topPull,
left,
right,
topPull);
// bottom curve
var bottomPull = -basePull - lookOffset * 2 * openAmount;
curves[1] = CatmullRomCurve.Create(count,
bottomPull,
left,
right,
bottomPull);
CatmullRomCurve BuildIrisSegment(float progress, Vector2 pull)
{
var start = curves[0].GetPointAlong(progress);
var end = curves[1].GetPointAlong(progress);
return(CatmullRomCurve.Create(count,
pull,
start,
end,
pull));
}
var progressForIris = 0.4f * (this.aimTimer / 20 + 1);
var pullFactor = (1 + this.aimTimer);
curves[2] = BuildIrisSegment(Math.Clamp(progressForIris + lookOffset.X, 0.2f, 0.8f), right * pullFactor);
curves[3] = BuildIrisSegment(Math.Clamp(1 - progressForIris + lookOffset.X, 0.2f, 0.8f), left * pullFactor);
this.eyeCurves = curves;
}
public override void Draw(SpriteBatch spriteBatch)
{
var curve = CatmullRomCurve.Create(25,
transform.ChildAt(0).transform.Position,
transform.ChildAt(1).transform.Position,
transform.ChildAt(2).transform.Position,
transform.ChildAt(3).transform.Position);
for (int i = 0; i < curve.Count - 1; i++)
{
if (this.time > i && this.time < i + 1)
{
spriteBatch.DrawCircle(new CircleF(curve.points[i], 5f), 3, Color.White, 1f, transform.Depth);
}
}
if (time > curve.Count)
{
time = 0;
}
curve.Draw(spriteBatch, Vector2.Zero, transform.Depth, 1f);
}