small tweaks to firework sim

fireworks/fireworks.go

@@ -20,12 +20,12 @@ import (
 
 const (
 	framesPerSecond = 60.0
-	numParticles    = 75
+	numParticles    = 50
 )
 
 var (
 	colors     = []string{"#fdff6a", "#ff718d"}
-	characters = []string{"•"}
+	characters = []string{"+", "*", "•"}
 	// characters = []string{"▄", "▀"}
 )
 
@@ -53,7 +53,6 @@ type model struct {
 type Particle struct {
 	char    string
 	physics *physics.Physics
-	radius  float64
 }
 
 func spawn() []*Particle {
@@ -64,7 +63,6 @@ func spawn() []*Particle {
 
 	color := lipgloss.Color(array.Sample(colors))
 	v := float64(rand.Intn(10) + 20.0)
-	r := float64(rand.Intn(5) + 10)
 
 	particles := []*Particle{}
 
@@ -76,13 +74,12 @@ func spawn() []*Particle {
 			physics: physics.New(
 				physics.Point{X: x, Y: y},
 				physics.Vector{X: math.Cos(float64(i)) * v, Y: math.Sin(float64(i)) * v / 2},
-				physics.Vector{Y: 2},
+				physics.Vector(physics.Gravity),
 				framesPerSecond,
 			),
 			char: lipgloss.NewStyle().
 				Foreground(color).
 				Render(array.Sample(characters)),
-			radius: r,
 		}
 
 		particles = append(particles, p)
@@ -120,14 +117,6 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				particlesVisible -= 1
 				continue
 			}
-
-			// Particle has reached its distance from the radius.
-			// In the fireworks simulation, firework particles fade after reaching a certain point
-			// just like in real life, so we don't render them if they've passed a certain distance
-			if p.physics.Displacement() > p.radius {
-				particlesVisible -= 1
-				continue
-			}
 		}
 
 		if particlesVisible <= 0 {