FBDL - Agent simulation

universe "has_noise"
description "Has the target noise?"
    "false" 0 0
    "true" 1 1
end

universe "distance"
description "The distance from the target."
    "close" 0 0
    "middle" 0.1 1
    "far" 1 1
end

universe "rest_distance"
description "The distance from the rest position."
    "close" 0 0
    "middle" 0.1 1
    "far" 1 1
end

universe "tiredness"
description "The measure of tiredness."
    "low" 0 0
    "small" 0.3 0.5	
	"middle" 0.7 0.5
    "high" 1 1
end

universe "rest_demand"
description "The measure of demand for the rest."
    "low" 0 0
    "small" 0.3 0
	"middle" 0.7 1
    "high" 1 1
end

universe "speed"
description "The speed of the agent."
    "forward" 1 1
    "stop" 0 0
    "backward" -1 -1
end

universe "approach"
description "The speed how the agent approaching the target."
    "low" 0 0
    "high" 1 1
end

universe "go_to_rest"
description "The speed how the agent go to the rest position."
    "low" 0 0
    "high" -1 -1
end

universe "interest"
description "The measure how the agent interested about the target."
    "low" 0 0
    "small" 0.3 0
	"middle" 0.7 1
    "high" 1 1
end

rulebase "interest"
description "The agent is interested when the target has noise."
    rule "low" when "distance" is "close" end
    dominates
       rule "high" when "has_noise" is "true" end
       rule "high" when "interest" is "high" end
       dominates
           rule "low" end
        end
    end
end

rulebase "rest_demand"
description "The agent requires rest if it is tired."
	rule "high" when "tiredness" is "high" end
    rule "low" when "tiredness" is "low" end
	rule "high" when "rest_demand" is "high" and "tiredness" is "small" end
	rule "low" when "rest_demand" is "low" and "tiredness" is "middle" end
end

rulebase "approach"
description "Approach when there is a closer interesting target."
    rule "high" when "distance" is "far" end
    dominates
        rule "low" end
    end
end

rulebase "go_to_rest"
description "Go to rest position when the target is tired."
    rule "high" when "rest_distance" is "far" end
    dominates
        rule "low" end
    end
end

rulebase "speed"
description "The speed fusioned from approach and go_to_rest values."
    rule use "go_to_rest" when "rest_demand" is "high" end
    dominates
       rule use "approach" when "interest" is "high" end
       dominates
           rule "stop" end
       end
    end
end

The previous FBDL code describes the behavior of an agent which can move an a line. First, we need to compile the code by clicking the "compile" button. The left side there is a rest position and a target on the right side. When the agent hears a noise its interest level increases and go to closer the target. When the target is close enough the interest level is decreasing. We can simulate the noise by clicking on the animation below. We can follow the current state below the animation.