public Collider(float x, float y, float sizeX, float sizeY)
{
Box = new Box2D(x, y, sizeX, sizeY);
//make a hsb color sweep in polar coordinates
var polar = MathHelper.ToPolar(new Vector2(x, y));
var rgb = ColorSystems.Hsb2rgb(polar.X / MathHelper.TWO_PI + 0.5f, polar.Y, 1);
Color = ColorSystems.ToSystemColor(rgb);
Velocity = Vector2.Zero;
}
private void InitParticles()
{
var rnd = new Random(12);
Func <float> Rnd01 = () => (float)rnd.NextDouble();
Func <float> RndCoord = () => (Rnd01() - 0.5f) * 2.0f;
Func <float> RndSpeed = () => (Rnd01() - 0.5f) * 0.1f;
bufferParticles = new BufferObject(BufferTarget.ShaderStorageBuffer);
var data = new Particle[particelCount];
for (int i = 0; i < particelCount; ++i)
{
data[i].position = new Vector2(RndCoord(), RndCoord());
data[i].velocity = new Vector2(RndSpeed(), RndSpeed());
var polar = MathHelper.ToPolar(data[i].position);
var color = ColorSystems.Hsb2rgb(polar.X / MathHelper.TWO_PI + 0.5f, polar.Y, 1);
var byteColor = ColorSystems.ToSystemColor(color);
data[i].color = color;
data[i].size = (Rnd01() + 1) * 10;
}
bufferParticles.Set(data, BufferUsageHint.StaticCopy);
}