private void DoReset()
{
var rnd = random.Value;
HSBPalette palette = new HSBPalette();
// Create a new array of points
for (int i = 0; i < _pointCount; i++)
{
var point = new Point(rnd.NextDouble(), rnd.NextDouble());
_points[i] = point;
var vertices = SharpDXHelper.MakeRectangle((float)point.X, (float)point.Y, 0.05f, 0.05f);
for (var j = 0; j < vertices.Count; j++)
{
_currentArray[i * 6 + j] = vertices[j];
}
}
// Replace the old array of points with the new array
Points = _points;
var temp = (Positions as DxVertex[]) ?? new DxVertex[_pointCount * 6];
Positions = _currentArray;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Positions)));
_currentArray = temp;
}
public DxInstancedRectangleTexturedSampleViewModel()
{
Geometry = SharpDXHelper.MakeRectangle(0f, 0f, 0.05f, 0.05f);
StartArrayUpdate();
}
private void StartArrayUpdate()
{
Task.Factory.StartNew(() =>
{
// Create the random directions
var rnd = random.Value;
Vector[] directions = Enumerable.Range(0, _pointCount).Select(i =>
{
var angle = rnd.NextDouble() * Math.PI * 2;
Vector dxdy = new Vector(Math.Sin(angle), Math.Cos(angle));
return(dxdy);
}).ToArray();
while (!_hasBeenDisposed)
{
if (_doReset)
{
DoReset();
_doReset = false;
}
if (_animationRunning)
{
// Update the position of every point according to its direction
for (int i = 0; i < Points.Count(); i++)
{
var dxdy = new Vector(directions[i].X * Width1Px, directions[i].Y * Height1Px);
var newX = dxdy.X + _points[i].X;
var newY = dxdy.Y + _points[i].Y;
// Point has hit an east or west wall. Reverse direction vector X component
if (newX < 0 || newX > 1)
{
newX = Math.Min(1, Math.Max(0, newX));
directions[i] = new Vector(-directions[i].X, directions[i].Y);
}
// Point has hit a north or south wall. Reverse direction vector Y component
if (newY < 0 || newY > 1)
{
newY = Math.Min(1, Math.Max(0, newY));
directions[i] = new Vector(directions[i].X, -directions[i].Y);
}
_points[i] = new Point(newX, newY);
var rectangle = SharpDXHelper.MakeRectangle((float)newX, (float)newY, 0.05f, 0.05f);
for (var j = 0; j < 6; j++)
{
_currentArray[i * 6 + j] = rectangle[j];
}
}
Points = _points;
var temp = (Positions as DxVertex[]) ?? new DxVertex[_pointCount * 6];
Positions = _currentArray;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Positions)));
_currentArray = temp;
}
Thread.Sleep(10);
}
});
}