Example usage for java.lang Math PI

Introduction

In this page you can find the example usage for java.lang Math PI.

Prototype

double PI

To view the source code for java.lang Math PI.

Click Source Link

Document

The double value that is closer than any other to pi, the ratio of the circumference of a circle to its diameter.

Usage

From source file:edu.purdue.cc.bionet.ui.layout.MultipleCirclesLayout.java

/**
 * Sets the initial position of the Graph nodes.
 *///w  w  w.  j a  v a2  s .co m
public void initialize() {
    if (this.sampleGroups != null) {
        Dimension d = this.getSize();
        List<List<V>> moleculeGroups = new ArrayList<List<V>>();
        for (int i = 0; i < 3; i++) {
            moleculeGroups.add(new ArrayList<V>());
        }
        if (d != null) {
            double height = d.getHeight();
            double width = d.getWidth();

            String groupName;
            for (V v : this.getGraph().getVertices()) {
                if (this.isUpRegulated(sampleGroups, v))
                    moleculeGroups.get(1).add(v);
                else if (this.isDownRegulated(sampleGroups, v))
                    moleculeGroups.get(2).add(v);
                else
                    moleculeGroups.get(0).add(v);
            }

            this.radius = (Math.min(height, width)) * 0.3;
            int groupRadius = (int) (this.radius / Math.sqrt(moleculeGroups.size()));

            int j = 0, x, y;
            Point2D.Double graphCenter = new Point2D.Double(width / 2.0, height / 2.0);
            PolarPoint2D center = new PolarPoint2D(0, 0, graphCenter);
            PolarPoint2D coord = new PolarPoint2D(0, 0, center);
            double theta;

            for (List<V> group : moleculeGroups) {
                theta = (2 * Math.PI * j) / moleculeGroups.size();
                j++;
                center.setLocation(this.radius, theta, PolarPoint2D.POLAR);
                int i = 0;
                for (V vertex : group) {
                    theta = (2 * Math.PI * i) / group.size();
                    coord.setLocation(groupRadius, theta, PolarPoint2D.POLAR);
                    this.setLocation(vertex, coord);
                    i++;
                }
            }
        }
    }
}

---

From source file:org.jfree.graphics2d.demo.ImageTest.java

private static double[] calculateReferenceArc(double angle) {
    double a = (angle / 180 * Math.PI) / 2.0;
    double x0 = Math.cos(a);
    double y0 = Math.sin(a);
    double x1 = (4 - x0) / 3;
    double y1 = (1 - x0) * (3 - x0) / (3 * y0);
    double x2 = x1;
    double y2 = -y1;
    double x3 = x0;
    double y3 = -y0;
    return new double[] { x0, y0, x1, y1, x2, y2, x3, y3 };
}

---

From source file:org.jfree.demo.DrawStringDemo.java

/**
 * Receives change event notification from the slider.
 *
 * @param event  the event./*from   w w  w.  ja va2 s.  c o m*/
 */
public void stateChanged(ChangeEvent event) {
    int r = this.slider.getValue();
    double angle = Math.PI * 2.0 * (r / 360.0);
    this.drawStringPanel2.setAngle(angle);
    this.drawStringPanel2.invalidate();
    this.drawStringPanel2.repaint();
}

---

From source file:de.berlios.statcvs.xml.chart.SymbolicNameAnnotation.java

/**
 * @see org.jfree.chart.annotations.XYAnnotation#draw(java.awt.Graphics2D, org.jfree.chart.plot.XYPlot, java.awt.geom.Rectangle2D, org.jfree.chart.axis.ValueAxis, org.jfree.chart.axis.ValueAxis)
 *///from   www .  j  a v a 2s  .c  om
public void draw(Graphics2D g2d, XYPlot xyPlot, Rectangle2D dataArea, ValueAxis domainAxis,
        ValueAxis rangeAxis) {
    PlotOrientation orientation = xyPlot.getOrientation();

    // don't draw the annotation if symbolic names date is out of axis' bounds.
    if (domainAxis.getUpperBound() < symbolicName.getDate().getTime()
            || domainAxis.getLowerBound() > symbolicName.getDate().getTime()) {

        return;
    }

    RectangleEdge domainEdge = Plot.resolveDomainAxisLocation(xyPlot.getDomainAxisLocation(), orientation);
    RectangleEdge rangeEdge = Plot.resolveRangeAxisLocation(xyPlot.getRangeAxisLocation(), orientation);

    float x = (float) domainAxis.translateValueToJava2D(symbolicName.getDate().getTime(), dataArea, domainEdge);
    float y1 = (float) rangeAxis.translateValueToJava2D(rangeAxis.getUpperBound(), dataArea, rangeEdge);
    float y2 = (float) rangeAxis.translateValueToJava2D(rangeAxis.getLowerBound(), dataArea, rangeEdge);

    g2d.setPaint(linePaint);
    g2d.setStroke(stroke);

    Line2D line = new Line2D.Float(x, y1, x, y2);
    g2d.draw(line);

    float anchorX = x;
    float anchorY = y1 + 2;

    g2d.setFont(font);
    g2d.setPaint(textPaint);

    /*g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, 
                     RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);*/

    RefineryUtilities.drawRotatedString(symbolicName.getName(), g2d, anchorX, anchorY, TextAnchor.BOTTOM_RIGHT,
            TextAnchor.BOTTOM_RIGHT, -Math.PI / 2);
}

---

From source file:org.mili.jmibs.jfree.JFreeChartBarIterationObjectLoadBenchmarkSuiteResultRenderer.java

private JFreeChart createChart(String title, CategoryDataset dataset) {
    JFreeChart chart = ChartFactory.createBarChart(title, "Benchmark (Iteration/Object Loading)", "Time in ns",
            dataset, PlotOrientation.HORIZONTAL, true, true, false);
    chart.setBackgroundPaint(Color.white);
    CategoryPlot plot = (CategoryPlot) chart.getPlot();
    NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
    rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
    BarRenderer renderer = (BarRenderer) plot.getRenderer();
    renderer.setDrawBarOutline(false);/*from ww  w .ja  v  a  2 s. c o m*/
    GradientPaint gp0 = new GradientPaint(0.0f, 0.0f, Color.blue, 0.0f, 0.0f, new Color(0, 0, 64));
    GradientPaint gp1 = new GradientPaint(0.0f, 0.0f, Color.green, 0.0f, 0.0f, new Color(0, 64, 0));
    GradientPaint gp2 = new GradientPaint(0.0f, 0.0f, Color.red, 0.0f, 0.0f, new Color(64, 0, 0));
    renderer.setSeriesPaint(0, gp0);
    renderer.setSeriesPaint(1, gp1);
    renderer.setSeriesPaint(2, gp2);
    CategoryAxis domainAxis = plot.getDomainAxis();
    domainAxis.setCategoryLabelPositions(CategoryLabelPositions.createUpRotationLabelPositions(Math.PI / 6.0));
    return chart;
}

---

From source file:edu.jhuapl.graphs.jfreechart.utils.RotatedTickDateAxis.java

@SuppressWarnings("unchecked")
@Override//from   w  w w  .j  a  v  a 2 s . c o m
protected List refreshTicksHorizontal(Graphics2D g2, Rectangle2D dataArea, RectangleEdge edge) {
    double rotationAngleInRad = Math.toRadians(tickLabelAngle);
    //Template types are specified here for additional type safety.
    List<Tick> ticks = (List<Tick>) super.refreshTicksHorizontal(g2, dataArea, edge);
    List<Tick> ret = new ArrayList<Tick>();
    for (Tick tick : ticks) {
        if (tick instanceof DateTick) {
            DateTick dateTick = (DateTick) tick;

            //The anchor used depends on the label angle, as follows:
            TextAnchor textAnchor, rotationAnchor;

            double modRadians = rotationAngleInRad % (2 * Math.PI);
            //Handle case where user provided a negative angle value.
            if (modRadians < 0) {
                modRadians += 2 * Math.PI;
            }

            //For angles between 0-180 degrees:
            if (modRadians <= Math.PI) {
                textAnchor = TextAnchor.CENTER_LEFT;
                rotationAnchor = TextAnchor.CENTER_LEFT;
            }
            //For angles between 180-360 degrees:
            else {
                textAnchor = TextAnchor.CENTER_RIGHT;
                rotationAnchor = TextAnchor.CENTER_RIGHT;
            }
            ret.add(new DateTick(dateTick.getDate(), dateTick.getText(), textAnchor, rotationAnchor,
                    rotationAngleInRad));
        } else {
            ret.add(tick);
        }
    }

    return ret;
}

---

From source file:org.fhcrc.cpl.toolbox.gui.chart.PanelWithBarChart.java

/**
 * Angle the labels on the category (x) axis to a nice, jaunty 30 degrees
 */
public void setCategoryLabelAngle30Degrees() {
    setCategoryLabelAngle(Math.PI / 6.0);
}

---

From source file:eagle.security.userprofile.model.kde.UserProfileKDEModeler.java

private void computeProbabilityDensityEstimation(RealMatrix inputMat) {

    probabilityEstimation = new double[inputMat.getRowDimension()];
    for (int i = 0; i < probabilityEstimation.length; i++)
        probabilityEstimation[i] = 1.0;//from  w ww.  ja va2s .c o m

    for (int i = 0; i < inputMat.getRowDimension(); i++) {
        for (int j = 0; j < inputMat.getColumnDimension(); j++) {
            if (statistics[j].getStddev() > 0) {
                double stddev = statistics[j].getStddev();
                double mean = statistics[j].getMean();
                double sqrt2PI = Math.sqrt(2.0 * Math.PI);
                double denominatorFirstPart = sqrt2PI * stddev;
                double squareMeanNormal = Math.pow((inputMat.getEntry(i, j) - mean), 2);
                double twoPowStandardDev = Math.pow(stddev, 2);
                double twoTimesTwoPowStandardDev = 2.0 * twoPowStandardDev;
                probabilityEstimation[i] *= ((1.00 / denominatorFirstPart)
                        * (Math.exp(-(squareMeanNormal / twoTimesTwoPowStandardDev))));
            }
        }
    }

    java.util.List<Double> listProb = new ArrayList<Double>();
    for (int i = 0; i < probabilityEstimation.length; i++) {
        probabilityEstimation[i] = Math.log10(probabilityEstimation[i]);
        listProb.add(probabilityEstimation[i]);
    }

    Collections.sort(listProb);
    int i = 0;
    for (double d : listProb)
        probabilityEstimation[i++] = d;

    minProbabilityEstimate = probabilityEstimation[probabilityEstimation.length - 1];
    maxProbabilityEstimate = probabilityEstimation[0];

    int len = probabilityEstimation.length;
    int nintyFivePercentIndex = (int) Math.round(0.05 * len);
    int medianPercentIndex = (int) Math.round(0.5 * len);
    if (medianPercentIndex >= len)
        medianProbabilityEstimate = probabilityEstimation[medianPercentIndex - 1];
    else
        medianProbabilityEstimate = probabilityEstimation[medianPercentIndex];
    nintyFivePercentileEstimate = probabilityEstimation[nintyFivePercentIndex];
}

---

From source file:org.jfree.chart.swt.demo.SWTBarChartDemo1.java

/**
 * Creates a sample chart.//from   w w  w .  j av  a2 s.  c o m
 *
 * @param dataset  the dataset.
 *
 * @return The chart.
 */
private static JFreeChart createChart(CategoryDataset dataset) {

    // create the chart...
    JFreeChart chart = ChartFactory.createBarChart("SWTBarChartDemo1", // chart title
            "Category", // domain axis label
            "Value", // range axis label
            dataset);

    // NOW DO SOME OPTIONAL CUSTOMISATION OF THE CHART...

    // get a reference to the plot for further customisation...
    CategoryPlot plot = (CategoryPlot) chart.getPlot();

    // set the range axis to display integers only...
    NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
    rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());

    // disable bar outlines...
    BarRenderer renderer = (BarRenderer) plot.getRenderer();
    renderer.setDrawBarOutline(false);

    // the SWTGraphics2D class doesn't handle GradientPaint well, so
    // replace the gradient painter from the default theme with a
    // standard painter...
    renderer.setBarPainter(new StandardBarPainter());

    CategoryAxis domainAxis = plot.getDomainAxis();
    domainAxis.setCategoryLabelPositions(CategoryLabelPositions.createUpRotationLabelPositions(Math.PI / 6.0));
    // OPTIONAL CUSTOMISATION COMPLETED.

    return chart;

}

---

From source file:TextureImage.java

public BranchGroup createSceneGraph() {
    // Create the root of the branch graph
    BranchGroup objRoot = new BranchGroup();

    // Create the transform group node and initialize it to the
    // identity. Enable the TRANSFORM_WRITE capability so that
    // our behavior code can modify it at runtime. Add it to the
    // root of the subgraph.
    TransformGroup objTrans = new TransformGroup();
    objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    objRoot.addChild(objTrans);/* w  w  w.  ja v a  2  s .c o m*/

    // Create appearance object for textured cube
    Appearance app = new Appearance();
    Texture tex = new TextureLoader(texImage, this).getTexture();
    app.setTexture(tex);
    TextureAttributes texAttr = new TextureAttributes();
    texAttr.setTextureMode(TextureAttributes.MODULATE);
    app.setTextureAttributes(texAttr);

    // Create textured cube and add it to the scene graph.
    Box textureCube = new Box(0.4f, 0.4f, 0.4f, Box.GENERATE_TEXTURE_COORDS, app);
    objTrans.addChild(textureCube);

    // Create a new Behavior object that will perform the desired
    // operation on the specified transform object and add it into
    // the scene graph.
    Transform3D yAxis = new Transform3D();
    Alpha rotationAlpha = new Alpha(-1, Alpha.INCREASING_ENABLE, 0, 0, 4000, 0, 0, 0, 0, 0);

    RotationInterpolator rotator = new RotationInterpolator(rotationAlpha, objTrans, yAxis, 0.0f,
            (float) Math.PI * 2.0f);
    BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0);
    rotator.setSchedulingBounds(bounds);
    objTrans.addChild(rotator);

    // Have Java 3D perform optimizations on this scene graph.
    objRoot.compile();

    return objRoot;
}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36
• 37
• 38
• 39
• 40
• 41
• 42
• 43
• 44
• 45
• 46
• 47
• 48
• 49
• 50
• »