another take on z-index

1 files changed, 46 insertions, 0 deletions

diff --git a/test/z_index.rb b/test/z_index.rb
new file mode 100644
index 0000000..e3014f7
--- /dev/null
+++ b/test/z_index.rb
@@ -0,0 +1,46 @@
+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