Package org.jCharts.axisChart.axis.scale

Class ScaleCalculator

  • Direct Known Subclasses:
    AutomaticScaleCalculator, UserDefinedScaleCalculator
    public abstract class ScaleCalculator
extends java.lang.Object
    Base class for the logic used to compute the scale on the charts. There are two implementations provided and you are free to implement your own if you do not like the default implementations provided.

    • Field Detail

      • minValue

        private double minValue

      • maxValue

        private double maxValue

      • roundingPowerOfTen

        private int roundingPowerOfTen

      • numberOfScaleItems

        private int numberOfScaleItems

      • increment

        protected double increment

    • Constructor Detail

      • ScaleCalculator

        public ScaleCalculator()

    • Method Detail

      • computeIncrement

        protected abstract void computeIncrement()
        Computes the scale increment.

      • computeScaleValues

        public final void computeScaleValues()
        Drives the computation of the axis increment and related values taking into account the user specified rounding criteria. So if you specify to round to the nearest 100 and give an increment of 2.5, the increment will become 100.

      • setMinValue

        public final void setMinValue​(double minValue)

      • getMinValue

        public final double getMinValue()

      • setMaxValue

        public final void setMaxValue​(double maxValue)

      • getMaxValue

        public final double getMaxValue()

      • getIncrement

        public final double getIncrement()

      • getNumberOfScaleItems

        public int getNumberOfScaleItems()

      • setNumberOfScaleItems

        public void setNumberOfScaleItems​(int numberOfScaleItems)

      • setRoundingPowerOfTen

        public final void setRoundingPowerOfTen​(int powerOfTen)
        Sets the exponent power of ten to round values to.
        Parameters:
        powerOfTen - exponent of ten to round to: 1=10, 2=100, -2=.01

      • getRoundingPowerOfTen

        public final int getRoundingPowerOfTen()

      • round

        protected double round​(double value,
                       double powerOfTen)
        Rounds the passed value by the power of ten specified
        Parameters:
        value - the value to round
        powerOfTen - the product of 10 times the rounding property.
        Returns:
        double the rounded result

      • roundTheIncrement

        protected void roundTheIncrement​(double powerOfTen)
        Rounds the scale increment up by the power of ten specified in the properties.
        Parameters:
        powerOfTen - the value of 10 times the rounding property.

      • toString

        public java.lang.String toString()
        Overrides:
        toString in class java.lang.Object
        Returns: