IntegerTickMarkCalculator.java

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 * as represented by the Administrator of the National Aeronautics and Space 
 * Administration. All rights reserved.
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 * The MCT platform is licensed under the Apache License, Version 2.0 (the 
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package plotter;


/**
 * Creates tick marks on integer values.
 * @author Adam Crume
 */
public class IntegerTickMarkCalculator implements TickMarkCalculator {
	private static final double[] EMPTY = new double[0];

	@Override
	public double[][] calculateTickMarks(Axis axis) {
		double axisStart = axis.getStart();
		double axisEnd = axis.getEnd();
		double min;
		double max;
		if(axisStart < axisEnd) {
			min = axisStart;
			max = axisEnd;
		} else {
			min = axisEnd;
			max = axisStart;
		}
		int start = (int) Math.ceil(min);
		int end = (int) Math.floor(max);
		int count = end - start + 1;
		double[] majorVals;
		if(count > 0) {
			majorVals = new double[count];
			for(int i = 0; i < count; i++) {
				majorVals[i] = start + i;
			}
		} else {
			majorVals = EMPTY;
		}

		return new double[][] { majorVals, EMPTY };
	}
}