Initial project import

tools/v/examples/fireworks/modules/objects/color.v

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+module objects
+
+import gg
+import rand
+
+pub fn random_color() gg.Color {
+	return gg.Color{
+		r: rand.u8()
+		g: rand.u8()
+		b: rand.u8()
+	}
+}

tools/v/examples/fireworks/modules/objects/constants.v

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+module objects
+
+pub struct UIParams {
+pub mut:
+	dpi_scale       f32    = 1.0
+	width           int    = 800
+	height          int    = 800
+	gravity         Vector = Vector{0, -0.03}
+	age_rate        int    = 1
+	offspring_count int    = 100
+	rocket_radius   int    = 5
+	particle_radius f32    = 2.5
+	drag            f32    = 0.98
+}
+
+const params = &UIParams{}
+
+pub fn get_params() &UIParams {
+	return params
+}

tools/v/examples/fireworks/modules/objects/particle.v

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+module objects
+
+import gg
+
+pub struct Particle {
+pub mut:
+	color    gg.Color
+	pos      Vector
+	vel      Vector
+	accel    Vector
+	lifespan f32 = 255
+}
+
+pub fn (particle Particle) draw(mut ctx gg.Context) {
+	ctx.draw_circle_filled(particle.pos.x, get_params().height - particle.pos.y,
+		get_params().particle_radius, particle.color)
+}
+
+pub fn (mut particle Particle) tick(mut rocket Rocket, mut ctx gg.Context) {
+	particle.lifespan -= get_params().age_rate
+	particle.color.a = u8(particle.lifespan)
+
+	if particle.lifespan <= 0 {
+		rocket.dead = true
+		return
+	}
+
+	particle.accel += get_params().gravity
+	particle.vel += particle.accel
+	particle.vel = particle.vel.mult(get_params().drag)
+	particle.pos += particle.vel
+	particle.draw(mut ctx)
+
+	particle.accel = Vector{}
+}

tools/v/examples/fireworks/modules/objects/rocket.v

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+module objects
+
+import gg
+import rand
+
+pub struct Rocket {
+pub mut:
+	color     gg.Color
+	pos       Vector
+	vel       Vector
+	accel     Vector
+	exploded  bool
+	particles []Particle
+	dead      bool
+}
+
+pub fn (rocket Rocket) draw(mut ctx gg.Context) {
+	ctx.draw_circle_filled(rocket.pos.x, get_params().height - rocket.pos.y,
+		get_params().rocket_radius, rocket.color)
+}
+
+pub fn (mut rocket Rocket) explode() {
+	rocket.exploded = true
+
+	for _ in 0 .. get_params().offspring_count {
+		rocket.spawn_particle()
+	}
+}
+
+pub fn (mut rocket Rocket) tick(mut ctx gg.Context) {
+	if !rocket.exploded {
+		if rocket.vel.y <= 1 {
+			rocket.explode()
+		}
+
+		rocket.accel += get_params().gravity
+		rocket.vel += rocket.accel
+		rocket.pos += rocket.vel
+		rocket.draw(mut ctx)
+
+		rocket.accel = Vector{}
+	}
+
+	for mut particle in rocket.particles {
+		particle.tick(mut rocket, mut ctx)
+	}
+}
+
+pub fn new_rocket() Rocket {
+	return Rocket{
+		color: random_color()
+		pos:   Vector{
+			x: rand.f32_in_range(50, get_params().width - 50) or { 50 }
+		}
+		vel:   Vector{
+			x: rand.f32_in_range(-1.5, 1.5) or { -1.5 }
+			y: rand.f32_in_range(5, 7) or { 5 }
+		}
+	}
+}
+
+pub fn (mut rocket Rocket) spawn_particle() {
+	rocket.particles << Particle{
+		color: rocket.color
+		pos:   rocket.pos
+		accel: random_vector_in_circle().mult(2)
+	}
+}

tools/v/examples/fireworks/modules/objects/vector.v

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+module objects
+
+import math
+import rand
+
+pub struct Vector {
+pub mut:
+	x f32
+	y f32
+}
+
+pub fn (a Vector) + (b Vector) Vector {
+	return Vector{a.x + b.x, a.y + b.y}
+}
+
+pub fn (vector Vector) mult(scalar f32) Vector {
+	return Vector{vector.x * scalar, vector.y * scalar}
+}
+
+pub fn random_vector_in_circle() Vector {
+	theta := rand.f32n(2 * math.pi) or { 0 }
+	y := rand.f32()
+
+	return Vector{
+		x: f32(y * math.sin(theta))
+		y: f32(y * math.cos(theta))
+	}
+}