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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(50, 50, 200, "red", @z_index_generator.get)
objects << Square.new(100, 50, 200, "blue", @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 - 100, y - 100, 200, "random", -objects.count)
end
end
show
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