Class: Bestguigui::Particle

Inherits:
Object
  • Object
show all
Defined in:
lib/bestguigui/particle.rb

Overview

Une particule qui se déplace en ligne droite (angle + vitesse) et meurt soit par fondu (fade_speed, en alpha perdu par seconde), soit selon une condition externe (dead_when), soit les deux.

Bestguigui::Particle.new(x: 100, y: 100, angle: Gosu.random(0, 360),
                        speed: Gosu.random(10, 200), size: 3,
                        fade_speed: 800)

Bestguigui::Particle.new(x: x, y: -100, angle: 180, speed: 150, size: 3,
                        color: Gosu::Color.new(128, 255, 255, 255),
                        dead_when: ->(p) { p.y >= 600 })

Utilisée seule ou via Particles pour gérer une collection.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(x:, y:, angle:, speed:, size:, color: Gosu::Color::WHITE, fade_speed: nil, z: 0, dead_when: nil) ⇒ Particle

Returns a new instance of Particle.



18
19
20
21
22
23
24
25
26
27
28
29
 
# File 'lib/bestguigui/particle.rb', line 18

def initialize(x:, y:, angle:, speed:, size:, color: Gosu::Color::WHITE,
               fade_speed: nil, z: 0, dead_when: nil)
  @x = x
  @y = y
  @angle = angle
  @speed = speed
  @size = size
  @color = color
  @fade_speed = fade_speed
  @z = z
  @dead_when = dead_when
end

Instance Attribute Details

#x ⇒ Object

Returns the value of attribute x.



16
17
18
 
# File 'lib/bestguigui/particle.rb', line 16

def x
  @x
end

#y ⇒ Object

Returns the value of attribute y.



16
17
18
 
# File 'lib/bestguigui/particle.rb', line 16

def y
  @y
end

Instance Method Details

#dead? ⇒ Boolean

Returns:

  • (Boolean) 


41
42
43
44
45
46
 
# File 'lib/bestguigui/particle.rb', line 41

def dead?
  return true if @fade_speed && @color.alpha <= 0
  return true if @dead_when&.call(self)

  false
end

#draw ⇒ Object 



48
49
50
 
# File 'lib/bestguigui/particle.rb', line 48

def draw
  Gosu.draw_rect(@x - @size / 2, @y - @size / 2, @size, @size, @color, @z)
end

#update(dt) ⇒ Object 



31
32
33
34
35
36
37
38
39
 
# File 'lib/bestguigui/particle.rb', line 31

def update(dt)
  @x += Gosu.offset_x(@angle, @speed * dt)
  @y += Gosu.offset_y(@angle, @speed * dt)

  return unless @fade_speed

  alpha = [@color.alpha - (@fade_speed * dt).floor, 0].max
  @color = Gosu::Color.new(alpha, @color.red, @color.green, @color.blue)
end