public void Draw(Graphics g)
{
PointF[] dest = new PointF[3];
Rot rotation = new Rot(alpha);
Vec sz = new Vec(image.Size).Scale(scale);
// x + px*cosa+py*sina, y - px*sina + py*cosa
dest[0] = Position.Add(rotation.Rotate(-sz.X, -sz.Y)).Point;
dest[1] = Position.Add(rotation.Rotate(sz.X, -sz.Y)).Point;
dest[2] = Position.Add(rotation.Rotate(-sz.X, sz.Y)).Point;
g.DrawImage(image, dest);
}
public bool CollidesWith(Rib rib, out double hittime)
{
// we are working in the reference frame of this.pos0, moving with the speed this.speed
Vec ribpos = rib.pos0.Subtract(pos0);
Vec ribspd = rib.speed.Subtract(speed);
double time = time0;
if (time0 < rib.time0)
{
// correct the position
time = rib.time0;
ribpos = ribpos.Subtract(speed.Scale(time - time0));
}
else if (time0 > rib.time0)
{
ribpos = ribpos.Add(rib.speed.Scale(time - rib.time0));
}
var spd2 = ribspd.Length2;
if (spd2 <= 0.00001)
{
hittime = 0;
return(false);
}
// Let's only find the closest position
// Xclose = X - (X*V)*V / (V*V)
// Tclose = -(X*V) / (V*V)
hittime = -ribpos.Scalar(ribspd) / spd2;
if (hittime < time ||
hittime > time1 ||
hittime > rib.time1)
{
return(false);
}
return(true);
}
private void setSpeed(Vec spd)
{
speed = spd;
pos1 = pos0.Add(speed.Scale(DeltaTime));
collision = null;
}
