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def tick args
args.outputs.background_color = [ 0, 0, 0 ]
args.outputs.primitives << [640, 700, "Touch your screen.", 5, 1, 255, 255, 255].label
# If you don't want to get fancy, you can just look for finger_one
# (and _two, if you like), which are assigned in the order new touches hit
# the screen. If not nil, they are touching right now, and are just
# references to specific items in the args.input.touch hash.
# If finger_one lifts off, it will become nil, but finger_two, if it was
# touching, remains until it also lifts off. When all fingers lift off, the
# the next new touch will be finger_one again, but until then, new touches
# don't fill in earlier slots.
if !args.inputs.finger_one.nil?
args.outputs.primitives << [640, 650, "Finger #1 is touching at (#{args.inputs.finger_one.x}, #{args.inputs.finger_one.y}).", 5, 1, 255, 255, 255].label
end
if !args.inputs.finger_two.nil?
args.outputs.primitives << [640, 600, "Finger #2 is touching at (#{args.inputs.finger_two.x}, #{args.inputs.finger_two.y}).", 5, 1, 255, 255, 255].label
end
# Here's the more flexible interface: this will report as many simultaneous
# touches as the system can handle, but it's a little more effort to track
# them. Each item in the args.input.touch hash has a unique key (an
# incrementing integer) that exists until the finger lifts off. You can
# tell which order the touches happened globally by the key value, or
# by the touch[id].touch_order field, which resets to zero each time all
# touches have lifted.
args.state.colors ||= [
0xFF0000, 0x00FF00, 0x1010FF, 0xFFFF00, 0xFF00FF, 0x00FFFF, 0xFFFFFF
]
size = 100
args.inputs.touch.each { |k,v|
color = args.state.colors[v.touch_order % 7]
r = (color & 0xFF0000) >> 16
g = (color & 0x00FF00) >> 8
b = (color & 0x0000FF)
args.outputs.primitives << [v.x - (size / 2), v.y + (size / 2), size, size, r, g, b, 255].solid
args.outputs.primitives << [v.x, v.y + size, k.to_s, 0, 1, 0, 0, 0].label
}
end
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