Example usage for org.apache.commons.math.linear RealVector unitize

Introduction

In this page you can find the example usage for org.apache.commons.math.linear RealVector unitize.

Prototype

void unitize();

Source Link

Document

Converts this vector into a unit vector.

Usage

From source file:net.ostis.scpdev.scg.geometry.LayoutRunnable.java

private void calculateForces() {
    int n = nodes.size();

    RealVector[] forces = new RealVector[n];
    for (int i = 0; i < n; ++i)
        forces[i] = new ArrayRealVector(nullVector);

    Map<IFigure, Integer> obj_f = new HashMap<IFigure, Integer>();

    ///*w  w w  . j a  v  a  2  s. c  om*/
    // Calculation repulsion forces.
    //
    for (int idx = 0; idx < n; ++idx) {
        SCgNodeShape obj = nodes.get(idx);

        obj_f.put(obj, idx);

        Point p1 = translateToCenter(obj.getBounds().getLocation());

        RealVector p1v = new ArrayRealVector(2);
        p1v.setEntry(0, p1.x);
        p1v.setEntry(1, p1.y);

        double l = nullVector.getDistance(p1v);

        RealVector f = p1v.mapMultiply(gravity * (l - 3.0));

        forces[idx] = forces[idx].subtract(f);

        for (int jdx = idx + 1; jdx < n; ++jdx) {
            Point p2 = translateToCenter(nodes.get(jdx).getBounds().getLocation());

            RealVector p2v = new ArrayRealVector(2);
            p2v.setEntry(0, p2.x);
            p2v.setEntry(1, p2.y);

            l = p1v.getDistance(p2v) / 50;

            if (l > max_rep_length)
                continue;

            if (l > 0.5) {
                f = p1v.subtract(p2v).mapMultiply(repulsion / l / l);
            } else {
                f = new ArrayRealVector(new double[] { Math.cos(0.17 * idx) * length * 7,
                        Math.sin(0.17 * (idx + 1)) * length * 7 });
            }

            forces[idx] = forces[idx].add(f);
            forces[jdx] = forces[jdx].subtract(f);
        }
    }

    //
    // Calculation springs.
    //
    for (SCgPairConnection line : lines) {
        SCgPair pair = line.getModel();

        SCgObject begin = pair.getBegin();
        SCgObject end = pair.getEnd();

        if (begin == null || end == null)
            continue;

        IFigure beginFigure = obj2figure.get(begin);
        IFigure endFigure = obj2figure.get(end);

        Point p1 = translateToCenter(beginFigure.getBounds().getLocation());
        Point p2 = translateToCenter(endFigure.getBounds().getLocation());

        RealVector p1v = new ArrayRealVector(2);
        p1v.setEntry(0, p1.x);
        p1v.setEntry(1, p1.y);

        RealVector p2v = new ArrayRealVector(2);
        p2v.setEntry(0, p2.x);
        p2v.setEntry(1, p2.y);

        double l = p1v.getDistance(p2v) / 50;

        RealVector f = null;

        if (l > 0) {
            RealVector pv = p2v.subtract(p1v);
            pv.unitize();

            int cnt = begin.getInputCount() + end.getOutputCount();
            f = pv.mapMultiply(rigidity * (l - Math.max(length, cnt / 3.0)) / l);

            if (nullVector.getDistance(f) > 10)
                f = pv.mapMultiply(rigidity / l);
        } else {
            f = new ArrayRealVector(nullVector);
        }

        if (obj_f.containsKey(beginFigure)) {
            int index = obj_f.get(beginFigure);
            forces[index] = forces[index].add(f);
        }

        if (obj_f.containsKey(endFigure)) {
            int index = obj_f.get(endFigure);
            forces[index] = forces[index].subtract(f);
        }
    }

    double maxf = 0.0;

    for (int idx = 0; idx < n; ++idx) {
        RealVector f = forces[idx];
        f.mapMultiplyToSelf(stepSize);

        maxf = Math.max(maxf, nullVector.getDistance(f));

        IFigure node = nodes.get(idx);
        Point location = translateToCenter(node.getBounds().getLocation());
        location.x += f.getEntry(0);
        location.y += f.getEntry(1);
        node.setLocation(translateFromCenter(location));
    }

    if (maxf > maxForce) {
        stepSize = stepMaxSize;
    } else {
        stepSize *= 0.97;
    }

    needLayout = stepSize > stepMinSize;
}

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