org.swtchart.ext/src/org/swtchart/ext/internal/SelectionRectangle.java

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package org.swtchart.ext.internal;

import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;

public class SelectionRectangle {

    private Point startPoint;

    private Point endPoint;

    public void setStartPoint(int x, int y) {
        startPoint = new Point(x, y);
    }

    public void setEndPoint(int x, int y) {
        endPoint = new Point(x, y);
    }

    public Point getHorizontalRange() {
        if (startPoint == null || endPoint == null) {
            return null;
        }

        return new Point(startPoint.x, endPoint.x);
    }

    public Point getVerticalRange() {
        if (startPoint == null || endPoint == null) {
            return null;
        }

        return new Point(startPoint.y, endPoint.y);
    }

    public boolean isDisposed() {
        return startPoint == null;
    }

    public void dispose() {
        startPoint = null;
        endPoint = null;
    }

    public void draw(GC gc) {
        if (startPoint == null || endPoint == null) {
            return;
        }

        int minX;
        int maxX;
        if (startPoint.x > endPoint.x) {
            minX = endPoint.x;
            maxX = startPoint.x;
        } else {
            minX = startPoint.x;
            maxX = endPoint.x;
        }

        int minY;
        int maxY;
        if (startPoint.y > endPoint.y) {
            minY = endPoint.y;
            maxY = startPoint.y;
        } else {
            minY = startPoint.y;
            maxY = endPoint.y;
        }

        gc.drawRectangle(minX, minY, maxX - minX, maxY - minY);
    }

}

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