basic-ability.txt

<<silently>>  /% StoryNexus BasicAbilities %/

<<set $broadScale to 60>>
<<set $narrowScale to 10>>

<<script>>

	var get = State.getVar || Wikifier.getValue
	var set = State.setVar || Wikifier.setValue

	window.BasicAbility = function(type, skill) {
		if(this instanceof BasicAbility) {
			this.type = type
			this.skill = skill || 0
			this.chance = BasicAbility.chance[type]
		} else return new BasicAbility(type, skill)
	}

	BasicAbility.prototype.ranges = [
		'almost impossible', 10,
		'high-risk', 30,
		'tough', 40,
		'very chancy', 50,
		'chancy', 60,
		'modest', 70,
		'very modest', 80,
		'low-risk', 90,
		'straightforward'
	]

	BasicAbility.prototype.changes = {
		'almost impossible': [-4, 6],
		'high-risk': [-3, 5],
		'tough': [-2, 4],
		'very chancy': [-1, 3],
		'chancy': [-1, 3],
		'modest': [-1, 2],
		'very modest': [-1, 2],
		'low-risk': [-1, 2],
		'straightforward': [-1, 1]
	}

	BasicAbility.chance = {
		broad: function(difficulty) {
			var percent = this.skill / difficulty * get('$broadScale')
			return Math.max(1, Math.min(99, percent))
		},
		narrow: function(difficulty) {
			var percent = (this.skill - difficulty) * get('$narrowScale')
			return Math.max(10, Math.min(99, percent + 50))
		}
	}

	BasicAbility.prototype.difficulty = function(difficulty) {
		return QBN.range(this.chance(difficulty), this.ranges)
	}

	BasicAbility.prototype.check = function(difficulty) {
		var percent = this.chance(difficulty)
		var success = State.random() * 100 < percent
		var range = QBN.range(percent, this.ranges)
		this.skill += this.changes[range][success|0]
		return success
	}

<</script>>

<</silently>>