public static void BuildRope(int x, int y, int len, double e, double m, double r)
{
Particle prev = null;
//Particle last = null;
int X = x;
for (int i = 0; x < X + len; i++)
{
Particle p = new Particle();
World.AddParticle(p);
p.Radius = r;
p.Position = new Vector(x, y);
p.Mass = m;
p.Restitution = e;
if (prev != null)
{
ParticleConnection c = new ParticleConnection(prev, p);
c.SpringConstant = 300;
c.RestLength = p.Radius * 1.3;
c.DampingConstant = 50;
World.Connections.Add(c);
}
prev = p;
x += (int)(2 * r);
}
}
private void simForm_MouseDown(object sender, MouseEventArgs e)
{
if (particle != null)
{
particle.Unmark();
}
if (line != null)
{
line.Unmark();
}
if (connection != null)
{
connection.Unmark();
}
a = new Vector(e.X, e.Y);
particle = null;
foreach (Particle p in World.Particles)
{
if ((p.Position - a).Length < (p.Radius / 2) + 1)
{
particle = p;
particle.Mark();
break;
}
}
if (true)
{
line = null;
foreach (Line l in World.Lines)
{
if (l.Distance(a) < 5)
{
line = l;
line.Mark();
break;
}
}
}
if (true)
{
connection = null;
foreach (ParticleConnection c in World.Connections)
{
Line temp = new Line(c.Particle1.Position, c.Particle2.Position);
if (temp.Distance(a) < 5)
{
connection = c;
connection.Mark();
break;
}
}
}
}
public static void BuildCircle(int x, int y, int r, int R)
{
Particle mid = new Particle();
mid.Position = new Vector(x, y);
mid.Radius = R;
World.AddParticle(mid);
Particle prev = null;
Particle first = null;
Vector rv = new Vector(r, 0);
int k = (int)((2 * 3.14 * r) / (mid.Radius * 3));
k += 1;
for (int i = 0; i < k; i++)
{
Particle p = new Particle();
p.Radius = R;
p.Mass = 1;
if (first == null)
{
first = p;
}
p.Position = new Vector(x + rv.X, y + rv.Y);
Vector n = rv.Orthogonal();
n.Normalize();
n *= (p.Radius * 3);
rv += n;
rv.Normalize();
rv *= r;
World.AddParticle(p);
ParticleConnection cm = new ParticleConnection(mid, p);
//cm.RestLength = r - r / 8;
cm.SpringConstant = 200;
//cm.DampingConstant = 100;
World.Connections.Add(cm);
if (prev != null)
{
ParticleConnection c = new ParticleConnection(prev, p);
c.RestLength /= 1.1;
c.SpringConstant = 300;
c.DampingConstant = 40;
World.Connections.Add(c);
}
prev = p;
}
ParticleConnection cc = new ParticleConnection(prev, first);
cc.SpringConstant = 300;
cc.DampingConstant = 40;
cc.RestLength /= 1.1;
//cc.RestLength = (prev.Position - first.Position).Length;
World.Connections.Add(cc);
}
public static void BuildChain(int x, int y, int l, int r, int m, bool xory, bool pin)
{
Particle prev = null;
Particle last = null;
int xx = x;
int yy = y;
for (int i = 0; true; i++)
{
Particle p = new Particle();
World.AddParticle(p);
p.Radius = r;
p.Position = new Vector(x, y);
p.Mass = m;
if (prev != null)
{
ParticleConnection c = new ParticleConnection(prev, p);
c.SpringConstant = 2000;
c.RestLength -= p.Radius * 2;
World.Connections.Add(c);
}
if (i == 0)
{
p.SimulateOn = false;
p.Mass = double.PositiveInfinity;
}
last = p;
prev = p;
if (xory)
{
x += 4 * r;
if (x > xx + l)
{
break;
}
}
else
{
y += 4 * r;
if (y > yy + l)
{
break;
}
}
}
if (pin && last != null)
{
last.SimulateOn = false;
last.Mass = double.PositiveInfinity;
}
}
public static void BuildSquare(int x, int y, int a, int b)
{
Particle p1 = new Particle();
p1.Position = new Vector(x, y);
Particle p2 = new Particle();
p2.Position = new Vector(x + a, y);
Particle p3 = new Particle();
p3.Position = new Vector(x + a, y + b);
Particle p4 = new Particle();
p4.Position = new Vector(x, y + b);
p1.Radius = p2.Radius = p3.Radius = p4.Radius = 2;
World.AddParticle(p1);
World.AddParticle(p2);
World.AddParticle(p3);
World.AddParticle(p4);
ParticleConnection c12 = new ParticleConnection(p1, p2);
ParticleConnection c23 = new ParticleConnection(p2, p3);
ParticleConnection c34 = new ParticleConnection(p3, p4);
ParticleConnection c41 = new ParticleConnection(p4, p1);
ParticleConnection c24 = new ParticleConnection(p2, p4);
ParticleConnection c13 = new ParticleConnection(p1, p3);
c12.RenderOn = true;
c23.RenderOn = true;
c34.RenderOn = true;
c41.RenderOn = true;
World.Connections.Add(c12);
World.Connections.Add(c23);
World.Connections.Add(c34);
World.Connections.Add(c41);
World.Connections.Add(c24);
World.Connections.Add(c13);
}
private void simForm_MouseUp(object sender, MouseEventArgs e)
{
if (a == null)
{
return;
}
Vector b = new Vector(e.X, e.Y);
Line line = null;
if (this.mode == Keys.L)
{
line = new Line(a, b);
}
else
{
if ((a - b).Length > 40)
{
line = new Segment(a, b);
}
}
dv = b - a;
if (particle != null)
{
Particle p2 = null;
foreach (Particle p in World.Particles)
{
if ((p.Position - b).Length < p.Radius * 4)
{
p2 = p;
p2.Pen = new Pen(Brushes.Green, 1.0f);
break;
}
}
if (p2 != null)
{
if ((particle.Position - p2.Position).Length > 10)
{
ParticleConnection c = new ParticleConnection(particle, p2);
c.RestLength = dv.Length;
if (p2 != particle)
{
World.Connections.Add(c);
}
}
}
else
{
particle.Position += dv;
}
}
else
{
if (line != null && line.Length > 40)
{
World.Lines.Add(line);
}
}
Invalidate();
}
