1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
require 'ruby2d'
set title: "Hello z-index"
set width: 500, height: 500
class ZIndexGenerator
def initialize
@z_index = 0
end
def get
@z_index += 1
@z_index
end
end
@z_index_generator = ZIndexGenerator.new
class Ruby2D::Square
def contains?(x, y)
x > @x and x < @x + @width and y > @y and y < @y + @height
end
end
objects = []
objects << Square.new(
x: 50,
y: 50,
size: 200,
color: "red",
z: @z_index_generator.get
)
objects << Square.new(
x: 100,
y: 50,
size: 200,
color: "blue",
z: @z_index_generator.get
)
on :mouse_down do |event|
x = event.x
y = event.y
case event.button
when :left
# Find square that you clicked, and set it's z-index to highest one in set
objects.sort!{|a, b| -a.z <=> -b.z }
first_object = objects.find do |object|
object.contains?(x, y)
end
first_object.z = @z_index_generator.get if first_object
when :right
# Add new square with z-index of zero, with the middle at mouse position
objects << Square.new(
x: x - 100,
y: y - 100,
size: 200,
color: "random",
z: -objects.count
)
end
end
show
|
