package de.intevation.gnv.jfreechart;

import java.io.Serializable;

/**
 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha Teichmann</a>
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class CompactXYItems
implements   Serializable
{
    protected double [] data;

    public CompactXYItems(double [] data) {
        this.data = data;
    }

    public double getX(int index) {
        return data[index << 1];
    }

    public double getY(int index) {
        return data[(index << 1)+1];
    }

    public void get(int index, double [] xy) {
        xy[0] = data[index = (index << 1) + 1];
        xy[1] = data[index + 1];
    }

    public double [] getData() {
        return data;
    }

    public void setData(double [] data) {
        this.data = data;
    }

    public int size() {
        return data.length >> 1;
    }

    public double [] calculateBoundingBox(double [] bbox)  {
        for (int i = 0; i < data.length;) {
            double x = data[i++];
            double y = data[i++];
            if (x < bbox[0]) bbox[0] = x;
            if (y < bbox[1]) bbox[1] = y;
            if (x > bbox[2]) bbox[2] = x;
            if (y > bbox[3]) bbox[3] = y;
        }
        return bbox;
    }

    public String toString() {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < data.length;) {
            if (i > 0) sb.append("; ");
            sb.append('(');
            sb.append(data[i++]);
            sb.append(", ");
            sb.append(data[i++]);
            sb.append(')');
        }
        return sb.toString();
    }


    public double getMinX() {
        double lower = Double.POSITIVE_INFINITY;

        for (int i = 0; i < data.length; i += 2) {
            double x = data[i];

            if (!Double.isNaN(x)) {
                lower = Math.min(lower, x);
            }
        }

        return lower;
    }


    public double getMaxX() {
        double upper = Double.NEGATIVE_INFINITY;

        for (int i = 0; i < data.length; i += 2) {
            double x = data[i];

            if (!Double.isNaN(x)) {
                upper = Math.max(upper, x);
            }
        }

        return upper;
    }


    public double getMinY() {
        double lower = Double.POSITIVE_INFINITY;

        for (int i = 1; i < data.length; i += 2) {
            double y = data[i];

            if (!Double.isNaN(y)) {
                lower = Math.min(lower, y);
            }
        }

        return lower;
    }


    public double getMaxY() {
        double upper = Double.NEGATIVE_INFINITY;

        for (int i = 1; i < data.length; i += 2) {
            double y = data[i];

            if (!Double.isNaN(y)) {
                upper = Math.max(upper, y);
            }
        }

        return upper;
    }
}
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