package org.simantics.maps;

import java.awt.geom.AffineTransform;

public class MapScalingTransform {

    private MapScalingTransform() {
    }
    public static final double scale = 256.0d / 360.0d;
    public static final AffineTransform INSTANCE = AffineTransform.getScaleInstance(scale, scale);
    public static final AffineTransform INVERSE = AffineTransform.getScaleInstance(1/scale, 1/scale);

    public static double getScaleX() {
        return INSTANCE.getScaleX();
    }

    public static double getScaleY() {
        return INSTANCE.getScaleY();
    }
    
    public static int zoomLevel(AffineTransform current) {
        double org = INSTANCE.getScaleX();
        double cur = current.getScaleX();
        double f = cur / org;
        double zoomLevel = Math.log10(f) / Math.log10(2);
        if (zoomLevel < 0) {
            zoomLevel = 0;
        }
        return (int) zoomLevel;
    }
}