Shooting firework effect

confetti/confetti.go

@@ -4,7 +4,6 @@ import (
 	"math/rand"
 	"time"
 
-	"github.com/charmbracelet/harmonica"
 	"github.com/maaslalani/confetty/array"
 	"github.com/maaslalani/confetty/simulation"
 
@@ -42,11 +41,11 @@ func Spawn(width, height int) []simulation.Particle {
 		y := float64(0)
 
 		p := simulation.Particle{
-			Physics: harmonica.NewProjectile(
+			Physics: simulation.NewProjectile(
-				harmonica.FPS(framesPerSecond),
+				simulation.FPS(framesPerSecond),
-				harmonica.Point{X: x + (float64(width/4) * (rand.Float64() - 0.5)), Y: y, Z: 0},
+				simulation.Point{X: x + (float64(width/4) * (rand.Float64() - 0.5)), Y: y, Z: 0},
-				harmonica.Vector{X: (rand.Float64() - 0.5) * 100, Y: rand.Float64() * 50, Z: 0},
+				simulation.Vector{X: (rand.Float64() - 0.5) * 100, Y: rand.Float64() * 50, Z: 0},
-				harmonica.Vector(harmonica.TerminalGravity),
+				simulation.Vector(simulation.TerminalGravity),
 			),
 			Char: lipgloss.NewStyle().
 				Foreground(lipgloss.Color(array.Sample(colors))).

fireworks/fireworks.go

@@ -5,7 +5,6 @@ import (
 	"math/rand"
 	"time"
 
-	"github.com/charmbracelet/harmonica"
 	"github.com/maaslalani/confetty/array"
 	"github.com/maaslalani/confetty/simulation"
 
@@ -21,6 +20,8 @@ const (
 var (
 	colors     = []string{"#a864fd", "#29cdff", "#78ff44", "#ff718d", "#fdff6a"}
 	characters = []string{"+", "*", "•"}
+	head_char  = "▄"
+	tail_char  = "│"
 )
 
 type frameMsg time.Time
@@ -35,24 +36,43 @@ type model struct {
 	system *simulation.System
 }
 
-func Spawn(width, height int) []simulation.Particle {
+func SpawnShoot(width, height int) simulation.Particle {
+	color := lipgloss.Color(array.Sample(colors))
+	v := float64(rand.Intn(15) + 15.0)
+
+	x := rand.Float64() * float64(width)
+
+	p := simulation.Particle{
+		Physics: simulation.NewProjectile(
+			simulation.FPS(framesPerSecond),
+			simulation.Point{X: x, Y: float64(height)},
+			simulation.Vector{X: 0, Y: -v},
+			simulation.Vector(simulation.TerminalGravity),
+		),
+		Char:          lipgloss.NewStyle().Foreground(color).Render(head_char),
+		TailChar:      lipgloss.NewStyle().Foreground(color).Render(tail_char),
+		Shooting:      true,
+		ExplosionCall: SpawnExplosion,
+	}
+	return p
+}
+
+func SpawnExplosion(x, y float64, width, height int) []simulation.Particle {
 	color := lipgloss.Color(array.Sample(colors))
 	v := float64(rand.Intn(10) + 20.0)
 
 	particles := []simulation.Particle{}
 
-	x := rand.Float64() * float64(width)
-	y := rand.Float64() * float64(height)
-
 	for i := 0; i < numParticles; i++ {
 		p := simulation.Particle{
-			Physics: harmonica.NewProjectile(
+			Physics: simulation.NewProjectile(
-				harmonica.FPS(framesPerSecond),
+				simulation.FPS(framesPerSecond),
-				harmonica.Point{X: x, Y: y},
+				simulation.Point{X: x, Y: y},
-				harmonica.Vector{X: math.Cos(float64(i)) * v, Y: math.Sin(float64(i)) * v / 2},
+				simulation.Vector{X: math.Cos(float64(i)) * v, Y: math.Sin(float64(i)) * v / 2},
-				harmonica.Vector(harmonica.TerminalGravity),
+				simulation.Vector(simulation.TerminalGravity),
 			),
 			Char:     lipgloss.NewStyle().Foreground(color).Render(array.Sample(characters)),
+			Shooting: false,
 		}
 		particles = append(particles, p)
 	}
@@ -61,7 +81,7 @@ func Spawn(width, height int) []simulation.Particle {
 
 func InitialModelWithSize(width, height int) model {
 	return model{system: &simulation.System{
-		Particles: Spawn(width, height),
+		Particles: []simulation.Particle{SpawnShoot(width, height)},
 		Frame: simulation.Frame{
 			Width:  width,
 			Height: height,
@@ -83,7 +103,7 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		case "ctrl+c", "q":
 			return m, tea.Quit
 		}
-		m.system.Particles = append(m.system.Particles, Spawn(m.system.Frame.Width, m.system.Frame.Height)...)
+		m.system.Particles = append(m.system.Particles, SpawnShoot(m.system.Frame.Width, m.system.Frame.Height))
 
 		return m, nil
 	case frameMsg:

go.mod

@@ -4,10 +4,8 @@ go 1.16
 
 require (
 	github.com/charmbracelet/bubbletea v0.19.0
-	github.com/charmbracelet/harmonica v0.1.1-0.20211027165653-ff7be1c0cd31
 	github.com/charmbracelet/lipgloss v0.4.0
-	github.com/containerd/console v1.0.3 // indirect
 	github.com/mattn/go-isatty v0.0.14 // indirect
-	golang.org/x/sys v0.0.0-20211025201205-69cdffdb9359 // indirect
+	golang.org/x/sys v0.0.0-20211031064116-611d5d643895 // indirect
 	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211
 )

go.sum

@@ -1,12 +1,9 @@
 github.com/charmbracelet/bubbletea v0.19.0 h1:1gz4rbxl3qZik/oP8QW2vUtul2gO8RDDzmoLGERpTQc=
 github.com/charmbracelet/bubbletea v0.19.0/go.mod h1:VuXF2pToRxDUHcBUcPmCRUHRvFATM4Ckb/ql1rBl3KA=
-github.com/charmbracelet/harmonica v0.1.1-0.20211027165653-ff7be1c0cd31 h1:SDIjOIg+gsaRt3vmfQ3hIP6KT4PCC2/ARbTU5hiy/Gg=
-github.com/charmbracelet/harmonica v0.1.1-0.20211027165653-ff7be1c0cd31/go.mod h1:KSri/1RMQOZLbw7AHqgcBycp8pgJnQMYYT8QZRqZ1Ao=
 github.com/charmbracelet/lipgloss v0.4.0 h1:768h64EFkGUr8V5yAKV7/Ta0NiVceiPaV+PphaW1K9g=
 github.com/charmbracelet/lipgloss v0.4.0/go.mod h1:vmdkHvce7UzX6xkyf4cca8WlwdQ5RQr8fzta+xl7BOM=
+github.com/containerd/console v1.0.2 h1:Pi6D+aZXM+oUw1czuKgH5IJ+y0jhYcwBJfx5/Ghn9dE=
 github.com/containerd/console v1.0.2/go.mod h1:ytZPjGgY2oeTkAONYafi2kSj0aYggsf8acV1PGKCbzQ=
-github.com/containerd/console v1.0.3 h1:lIr7SlA5PxZyMV30bDW0MGbiOPXwc63yRuCP0ARubLw=
-github.com/containerd/console v1.0.3/go.mod h1:7LqA/THxQ86k76b8c/EMSiaJ3h1eZkMkXar0TQ1gf3U=
 github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
 github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/mattn/go-isatty v0.0.13/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
@@ -23,6 +20,7 @@ github.com/muesli/reflow v0.3.0 h1:IFsN6K9NfGtjeggFP+68I4chLZV2yIKsXJFNZ+eWh6s=
 github.com/muesli/reflow v0.3.0/go.mod h1:pbwTDkVPibjO2kyvBQRBxTWEEGDGq0FlB1BIKtnHY/8=
 github.com/muesli/termenv v0.9.0 h1:wnbOaGz+LUR3jNT0zOzinPnyDaCZUQRZj9GxK8eRVl8=
 github.com/muesli/termenv v0.9.0/go.mod h1:R/LzAKf+suGs4IsO95y7+7DpFHO0KABgnZqtlyx2mBw=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
@@ -33,8 +31,8 @@ golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20211025201205-69cdffdb9359 h1:2B5p2L5IfGiD7+b9BOoRMC6DgObAVZV+Fsp050NqXik=
+golang.org/x/sys v0.0.0-20211031064116-611d5d643895 h1:iaNpwpnrgL5jzWS0vCNnfa8HqzxveCFpFx3uC/X4Tps=
-golang.org/x/sys v0.0.0-20211025201205-69cdffdb9359/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20211031064116-611d5d643895/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20210422114643-f5beecf764ed/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 h1:JGgROgKl9N8DuW20oFS5gxc+lE67/N3FcwmBPMe7ArY=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=

simulation/projectile.go

@@ -0,0 +1,33 @@
+package simulation
+
+type Projectile struct {
+	Position     Point
+	Velocity     Vector
+	Acceleration Vector
+	DeltaTime    float64
+}
+
+type Point struct {
+	X, Y, Z float64
+}
+
+type Vector struct {
+	X, Y, Z float64
+}
+
+var Gravity = Vector{0, -9.81, 0}
+var TerminalGravity = Vector{0, 9.81, 0}
+
+func NewProjectile(del float64, pos Point, vel, acc Vector) *Projectile {
+	return &Projectile{pos, vel, acc, del}
+}
+
+func (p *Projectile) Update() {
+	p.Position.X += (p.Velocity.X * p.DeltaTime)
+	p.Position.Y += (p.Velocity.Y * p.DeltaTime)
+	p.Position.Z += (p.Velocity.Z * p.DeltaTime)
+
+	p.Velocity.X += (p.Acceleration.X * p.DeltaTime)
+	p.Velocity.Y += (p.Acceleration.Y * p.DeltaTime)
+	p.Velocity.Z += (p.Acceleration.Z * p.DeltaTime)
+}

simulation/simulation.go

@@ -3,8 +3,7 @@ package simulation
 import (
 	"fmt"
 	"strings"
-
+	"time"
-	"github.com/charmbracelet/harmonica"
 )
 
 type System struct {
@@ -14,8 +13,11 @@ type System struct {
 
 type Particle struct {
 	Char          string
-	Physics *harmonica.Projectile
+	TailChar      string
+	Physics       *Projectile
 	Hidden        bool
+	Shooting      bool
+	ExplosionCall func(x, y float64, width, height int) []Particle
 }
 
 type Frame struct {
@@ -23,6 +25,10 @@ type Frame struct {
 	Height int
 }
 
+func FPS(n int) float64 {
+	return (time.Second / time.Duration(n)).Seconds()
+}
+
 func RemoveParticleFromArray(s []Particle, i int) []Particle {
 	s[i] = s[len(s)-1]
 	return s[:len(s)-1]
@@ -30,8 +36,19 @@ func RemoveParticleFromArray(s []Particle, i int) []Particle {
 
 func (s *System) Update() {
 	for i := len(s.Particles) - 1; i >= 0; i-- {
-		p := s.Particles[i].Physics.Position()
+		p := s.Particles[i]
-		if p.X > float64(s.Frame.Width) || p.X < 0 || p.Y > float64(s.Frame.Height) {
+		pos := p.Physics.Position
+
+		// if the shooting particle is slow enough then hide it and call the explosion function
+		if !p.Hidden && p.Shooting && p.Physics.Velocity.Y > -3 {
+			p.Hidden = true
+			if p.ExplosionCall != nil {
+				s.Particles = append(s.Particles, p.ExplosionCall(p.Physics.Position.X, p.Physics.Position.Y, s.Frame.Width, s.Frame.Height)...)
+			}
+		}
+
+		// remove particles that are hidden or out of the side/bottom of the frame
+		if p.Hidden || pos.X > float64(s.Frame.Width) || pos.X < 0 || pos.Y > float64(s.Frame.Height) {
 			s.Particles = RemoveParticleFromArray(s.Particles, i)
 		} else {
 			s.Particles[i].Physics.Update()
@@ -40,9 +57,9 @@ func (s *System) Update() {
 }
 
 func (s *System) Visible(p Particle) bool {
-	y := int(p.Physics.Position().Y)
+	y := int(p.Physics.Position.Y)
-	x := int(p.Physics.Position().X)
+	x := int(p.Physics.Position.X)
-	return y >= 0 && y < s.Frame.Height-1 && x >= 0 && x < s.Frame.Width-1
+	return !p.Hidden && y >= 0 && y < s.Frame.Height-1 && x >= 0 && x < s.Frame.Width-1
 }
 
 func (s *System) Render() string {
@@ -53,7 +70,16 @@ func (s *System) Render() string {
 	}
 	for _, p := range s.Particles {
 		if s.Visible(p) {
-			plane[int(p.Physics.Position().Y)][int(p.Physics.Position().X)] = p.Char
+			plane[int(p.Physics.Position.Y)][int(p.Physics.Position.X)] = p.Char
+			if p.Shooting {
+				l := -int(p.Physics.Velocity.Y)
+				for i := 1; i < l; i++ {
+					y := int(p.Physics.Position.Y) + i
+					if y > 0 && y < s.Frame.Height-1 {
+						plane[y][int(p.Physics.Position.X)] = p.TailChar
+					}
+				}
+			}
 		}
 	}
 	for i := range plane {