/*
* Ext GWT - Ext for GWT
* Copyright(c) 2007-2009, Ext JS, LLC.
* licensing@extjs.com
*
* http://extjs.com/license
*/
package com.extjs.gxt.charts.client.model;
/**
* Provides the chart scale given a minimum and maximum value.
*/
public interface ScaleProvider {
public static ScaleProvider DEFAULT_SCALE_PROVIDER = new ScaleProvider() {
public Scale calcScale(double min, double max) {
if (min == 0 && max == 0) {
return new Scale(-1, 1, 1);
}
min = Math.floor(min * (min > 0 ? .9 : 1.1));
max = Math.round(max * (max > 0 ? 1.1 : .9));
return new Scale(min, max, Math.max(min > 0 ? min : min * -1, max > 0 ? max : max * -1) / 10);
}
};
public static ScaleProvider ROUNDED_NEAREST_SCALE_PROVIDER = new ScaleProvider() {
public Scale calcScale(double min, double max) {
Scale scale = DEFAULT_SCALE_PROVIDER.calcScale(min, max);
scale.setInterval(Math.round(scale.getInterval()));
return scale;
}
};
/**
* Returns the scale for the given minimum and maximum value.
*
* @param min the minimum value
* @param max the maximum value
* @return the scale
*/
public Scale calcScale(double min, double max);
}
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