ocelot-desktop/src/main/scala/ocelot/desktop/node/OcelotLogParticleNode.scala

package ocelot.desktop.node

import ocelot.desktop.ColorScheme
import ocelot.desktop.entity.traits.OcelotInterface
import ocelot.desktop.geometry.FloatUtils.ExtendedFloat
import ocelot.desktop.geometry.Vector2D
import ocelot.desktop.graphics.Graphics
import ocelot.desktop.node.OcelotLogParticleNode._
import ocelot.desktop.ui.UiHandler
import ocelot.desktop.ui.event.BrainEvent
import ocelot.desktop.ui.particle.Particle

import scala.util.Random

trait OcelotLogParticleNode extends Node {
  eventHandlers += {
    case BrainEvent(OcelotInterface.LogEvent.CardToUser(_, _)) =>
      val system = UiHandler.root.workspaceView.particleSystem
      if (system.count[LogParticle](Some(this)) < MaxLogParticles) {
        system.add(new LogParticle)
      }
  }

  private class LogParticle extends Particle(-LogParticleGrow, origin = Some(this)) {
    private val angle: Float = Random.between(0f, 2 * math.Pi.toFloat * LogParticleMaxAngle)
    override def update(dt: Float): Unit = {
      time += LogParticleMoveSpeed * dt
    }
    override def draw(g: Graphics): Unit = {
      val size = (1 + time / LogParticleGrow).clamp() * LogParticleSize
      val offset = time.clamp() * LogParticleMoveDistance
      val alpha = 1 - time.clamp()

      val r1 = (bounds.w max bounds.h) / math.sqrt(2) + offset + LogParticlePadding
      val r2 = r1 + size

      for (i <- 0 until LogParticleCount) {
        val a = angle + (2 * math.Pi).toFloat * i / LogParticleCount
        val v = Vector2D.unit(a)
        val p1 = v * r1 + bounds.center
        val p2 = v * r2 + bounds.center
        g.line(p1, p2, 1f, ColorScheme("LogParticle").mapA(_ => alpha))
      }
    }
  }
}

object OcelotLogParticleNode {
  private val MaxLogParticles: Int = 15
  private val LogParticleMaxAngle: Float = 0.25f
  private val LogParticleCount: Int = 12
  private val LogParticleGrow: Float = 0.25f
  private val LogParticlePadding: Float = 2f
  private val LogParticleSize: Float = 10f
  private val LogParticleMoveSpeed: Float = 1f
  private val LogParticleMoveDistance: Float = 20f
}