public void Run()
{
Vec v = new Vec(1.0,1.0);
Console.WriteLine("v={0}", v);
v = v.Scale(5.0).Add(new Vec(3.0,-2.0));
Console.WriteLine("v={0}", v);
}
public void TestSort()
{
var list = new List<Vec>();
const int len = 10;
list.Capacity = len;
for (int i = 0; i < len; ++i) {
var s = new Vec(GetF(100.0), GetF(50.0));
list.Add(s);
}
Console.WriteLine("The list is [{0}]", string.Join(", ", list));
list.Sort(this.compareVecByX);
Console.WriteLine("The list is [{0}]", string.Join(", ", list));
Assert.That(false);
}
public RibRect(Rib r)
{
var radius = r.Sprite.Radius;
min = r.StartPos;
max = r.EndPos;
if (max.X < min.X) {
var t = max.X;
max.X = min.X;
min.X = t;
}
if (max.Y < min.Y) {
var t = max.Y;
max.Y = min.Y;
min.Y = t;
}
min.X -= radius;
min.Y -= radius;
max.X += radius;
max.Y += radius;
}
public Vec Add(Vec x)
{
var tmp = this;
tmp.X += x.X;
tmp.Y += x.Y;
return tmp;
}
public Vec Rotate(Vec a)
{
return Rotate(a.X, a.Y);
}
void OnMouseUp(object sender, MouseEventArgs a)
{
if (a.Button == MouseButtons.Left && !mouseDownLocation.IsEmpty) {
U.show("OnMouseUp");
var s = new Sprite(images[curimage], 0.0F);
s.Position = new Vec(mouseDownLocation);
Vec spd = new Vec(a.Location).Subtract(s.Position).Scale(0.4);
var speedlen = spd.Length;
if (speedlen > U.maxspeed) {
spd = spd.Scale(U.maxspeed/speedlen);
} else if (speedlen < U.minspeed) {
// make random speed
double alpha = Math.PI * 2.0 * random.NextDouble();
speedlen = (random.NextDouble() * (U.maxspeed-U.minspeed) + U.minspeed);
spd = Vec.Dir(alpha).Scale(speedlen);
}
s.Speed = spd;
s.Rotation = (float)(random.NextDouble() - 0.5) * 10.0F;
sprites.Add(s);
mouseDownLocation = new Point();
mouseLastLocation = mouseDownLocation;
} else if (a.Button == MouseButtons.Right) {
curimage += 1;
if (curimage >= images.Count) {
curimage = 0;
}
prototype = new Sprite(images[curimage], 0.0F);
}
}
public Vec Subtract(Vec x)
{
var tmp = this;
tmp.X -= x.X;
tmp.Y -= x.Y;
return tmp;
}
public Rot(double alpha)
{
rot = new Vec(Math.Cos(alpha), Math.Sin(alpha));
}
// return a tangental projection
public Vec Project(Vec v)
{
return v.Scale(this.Scalar(v)/v.Length2);
}
public double Scalar(Vec v)
{
return X * v.X + Y * v.Y;
}
private int compareVecByX(Vec a, Vec b)
{
return (a.X < b.X) ? -1 : ((a.X > b.X) ? 1 : 0);
}
public Vec Normal(Vec v)
{
return this.Subtract(Project(v));
}
public Sprite(Bitmap theimg, double themass)
: this()
{
image = theimg;
Speed = new Vec();
alpha = omega = 0.0;
// init is the initial radius
var init = Math.Min(image.Size.Width, image.Size.Height) * 0.5;
if (themass <= 0.001) {
themass = init * init;
}
mass = themass;
radius = Math.Sqrt(mass);
scale = radius / init * 0.5;
Position = new Vec(image.Size).Scale(scale);
}
public void Update(Rib rib)
{
Position = rib.EndPos;
Speed = rib.Speed;
alpha += omega * rib.DeltaTime;
}
public void Update(Rib rib)
{
Position = rib.EndPos;
Speed = rib.Speed;
alpha += omega * rib.DeltaTime;
}
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 Sprite(Bitmap theimg, Sprite one, Sprite two)
: this(theimg, one.mass + two.mass)
{
// now calculate the position, speed and rotation
double invertmass = 1.0/mass;
Position = one.Position.Scale(one.Mass).Add(two.Position.Scale(two.Mass)).Scale(invertmass);
Speed = one.Speed.Scale(one.Mass).Add(two.Speed.Scale(two.mass)).Scale(invertmass);
alpha = (Math.IEEERemainder(one.alpha,Math.PI*2) * one.AngularMass + Math.IEEERemainder(two.alpha,Math.PI*2) * two.AngularMass) / AngularMass;
// sum up all moments of rotation
double totalRotationMomentum =
one.Mass * one.Position.Subtract(Position).Normal(one.Speed).Length +
two.Mass * two.Position.Subtract(Position).Normal(two.Speed).Length +
one.AngularMass * one.omega + two.AngularMass * two.omega;
omega = totalRotationMomentum / AngularMass;
}
