protected override void Draw()
{
GraphicsDeviceManager.GraphicsDevice.Clear(Color.FromNonPremultiplied(64, 64, 64, 255));
if (_effect == null)
{
return;
}
if (_batch == null)
{
_batch = new SpriteBatch(GraphicsDeviceManager.GraphicsDevice);
}
FarTransform transform;
transform.Matrix = Matrix.Identity;
transform.Translation.X = Width / 2;
transform.Translation.Y = Height / 2;
_renderer.RenderEffect(_effect, ref transform);
}
public void OnDraw(Draw message)
{
if (!Enabled)
{
return;
}
// Get global transform.
var transform = GetTransform();
var translation = GetTranslation();
// Get delta to keep update speed constant regardless of framerate.
var delta = (message.ElapsedMilliseconds / 1000f) * _simulationSpeed();
// Get the interpolation system to get an interpolated position for the effect generator.
var interpolation = (InterpolationSystem)Manager.GetSystem(InterpolationSystem.TypeId);
// Handle particle effects attached to entities.
foreach (var component in Components)
{
// Skip disabled components.
if (!component.Enabled)
{
continue;
}
// Handle each effect per component.
foreach (var effect in component.Effects)
{
// Get info for triggering and rendering.
FarPosition position;
float angle;
interpolation.GetInterpolatedTransform(component.Entity, out position, out angle);
// Load / initialize particle effects if they aren't yet.
if (effect.Effect == null)
{
var content = ((ContentSystem)Manager.GetSystem(ContentSystem.TypeId)).Content;
effect.Effect = content.Load <ParticleEffect>(effect.AssetName).DeepCopy();
effect.Effect.LoadContent(content);
effect.Effect.Initialise();
}
// Only do the triggering work if the effect is actually enabled.
// ALWAYS RENDER, to allow already triggered effects to play out (and not
// instantly disappear).
if (effect.Enabled && effect.Scale * effect.Intensity > 0.1f)
{
// Check if it's in bounds, i.e. whether we have to trigger it at all.
var localTranslation = Vector2.Transform((Vector2)(position + translation), transform);
var bounds = _renderer.GraphicsDeviceService.GraphicsDevice.Viewport.Bounds;
bounds.Inflate(256, 256);
if (bounds.Contains((int)localTranslation.X, (int)localTranslation.Y))
{
// Move the offset according to rotation.
var cosRadians = (float)Math.Cos(angle);
var sinRadians = (float)Math.Sin(angle);
FarPosition offset;
offset.X = effect.Offset.X * cosRadians - effect.Offset.Y * sinRadians;
offset.Y = effect.Offset.X * sinRadians + effect.Offset.Y * cosRadians;
// Adjust emitting rotation.
angle += effect.Direction;
// Trigger.
effect.Effect.Trigger(offset, angle, effect.Scale * effect.Intensity);
}
}
// Render at owning entity's position.
FarTransform localTransform;
localTransform.Matrix = transform;
localTransform.Translation = FarUnitConversion.ToScreenUnits(translation + position);
_renderer.RenderEffect(effect.Effect, ref localTransform);
// Update after rendering.
effect.Effect.Update(delta);
}
}
// Render and update all known unbound effects (not attached to an entity).
FarTransform globalTransform;
globalTransform.Matrix = transform;
globalTransform.Translation = FarUnitConversion.ToScreenUnits(translation);
foreach (var effect in _effects.Values)
{
_renderer.RenderEffect(effect, ref globalTransform);
effect.Update(delta);
}
}