public class ThresholdScale extends DiscreteQuantitativeScale<ThresholdScale>
The input domain is still continuous, and divided into slices based on a set of threshold values.
The input domain is typically a dimension of the data that you want to visualize, such as the height of students (measured in meters) in a sample population.
The output range is typically a dimension of the desired output visualization, such as a set of colors (represented as strings).
A new threshold scale has the default domain [.5] and the default range [0,1]. Thus, the default thresold scale is equivalent to the round function for numbers; for example threshold(0.49) returns 0, and threshold(0.51) returns 1.
The values in the domain array must be in sorted ascending order, or the behavior of the scale is undefined. The values are typically numbers, but any naturally ordered values (such as strings) will work. Thus, a threshold scale can be used to encode any type that is ordered. If the number of values in the scale's range is N + 1, the number of values in the scale's domain must be N. If there are fewer than N elements in the domain, the additional values in the range are ignored. If there are more than N elements in the domain, the scale may return undefined for some inputs.
The elements in the output range array need not be numbers; any value or type will work.
| Modifier | Constructor and Description |
|---|---|
protected |
ThresholdScale() |
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