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/*
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
 */
package com.ocs.jasperreports.chart;

import org.jfree.chart.axis.ValueAxis;
import org.jfree.data.Range;

public class AbstractChartCustomizer {
	protected void expandRange(ChartCustomizer.XYMarker rangeMarker, ValueAxis rangeAxis) {
		if (!rangeMarker.isExpandAxis()) {
			return;
		}

		final double rangeMarkerValue = rangeMarker.getValue();

		// always 15% extra to show text
		final double extraSpace = rangeMarkerValue / 100 * 15;
		final double rangeMarkerUpper = rangeMarkerValue + extraSpace;
		final double rangeMarkerLower = rangeMarkerValue - extraSpace;

		final Range axisRange = rangeAxis.getRange();

		// if it does not fit in range, expand
		if (rangeMarkerLower < axisRange.getLowerBound()) {
			setLowerBound(rangeMarkerLower, rangeAxis);
		}

		if (rangeMarkerValue > axisRange.getUpperBound()) {
			setUpperBound(rangeMarkerUpper, rangeAxis);
		}
	}

	private void setLowerBound(double min, ValueAxis rangeAxis) {
		if (rangeAxis.getUpperBound() > min) {
			rangeAxis.setRange(new Range(min, rangeAxis.getUpperBound()), true, false);
		} else {
			rangeAxis.setRange(new Range(min, min + 1.0), true, false);
		}
	}

	private void setUpperBound(double max, ValueAxis rangeAxis) {
		if (rangeAxis.getLowerBound() < max) {
			rangeAxis.setRange(new Range(rangeAxis.getLowerBound(), max), true, false);
		} else {
			rangeAxis.setRange(new Range(max - 1.0, max), true, false);
		}
	}
}