Examples of org.jfree.data.general.ValueDataset

org.jfree.data.general.ValueDataset
An interface for a dataset that returns a single value.

     * @param index  the dataset index.
     *
     * @return The dataset (possibly <code>null</code>).
     */
    public ValueDataset getDataset(int index) {
        ValueDataset result = null;
        if (this.datasets.size() > index) {
            result = (ValueDataset) this.datasets.get(index);
        }
        return result;
    }

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     * @param index  the dataset index.
     * @param dataset  the dataset (<code>null</code> permitted).
     */
    public void setDataset(int index, ValueDataset dataset) {
        
        ValueDataset existing = (ValueDataset) this.datasets.get(index);
        if (existing != null) {
            existing.removeChangeListener(this);
        }
        this.datasets.set(index, dataset);
        if (dataset != null) {
            dataset.addChangeListener(this);
        }

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     * 
     * @return The data value.
     */
    public double getValue(int datasetIndex) {
        double result = Double.NaN;
        ValueDataset dataset = getDataset(datasetIndex);
        if (dataset != null) {
            Number n = dataset.getValue();
            if (n != null) {
                result = n.doubleValue();
            }
        }
        return result;

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     */
    public void setDataset(ValueDataset dataset) {


        // if there is an existing dataset, remove the plot from the list
        // of change listeners...
        ValueDataset existing = this.dataset;
        if (existing != null) {
            existing.removeChangeListener(this);
        }


        // set the new dataset, and register the chart as a change listener...
        this.dataset = dataset;
        if (dataset != null) {

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        double meterMiddleX = meterArea.getCenterX();
        double meterMiddleY = meterArea.getCenterY();


        // plot the data (unless the dataset is null)...
        ValueDataset data = getDataset();
        if (data != null) {
            double dataMin = this.range.getLowerBound();
            double dataMax = this.range.getUpperBound();


            Shape savedClip = g2.getClip();
            g2.clip(originalArea);
            Composite originalComposite = g2.getComposite();
            g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,
                    getForegroundAlpha()));


            if (this.dialBackgroundPaint != null) {
                fillArc(g2, originalArea, dataMin, dataMax,
                        this.dialBackgroundPaint, true);
            }
            drawTicks(g2, meterArea, dataMin, dataMax);
            drawArcForInterval(g2, meterArea, new MeterInterval("", this.range,
                    this.dialOutlinePaint, new BasicStroke(1.0f), null));


            for (MeterInterval interval : this.intervals) {
                drawArcForInterval(g2, meterArea, interval);
            }


            Number n = data.getValue();
            if (n != null) {
                double value = n.doubleValue();
                drawValueLabel(g2, meterArea);


                if (this.range.contains(value)) {

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     */
    public void setDataset(ValueDataset dataset) {


        // if there is an existing dataset, remove the plot from the list of
        // change listeners...
        ValueDataset existing = this.dataset;
        if (existing != null) {
            existing.removeChangeListener(this);
        }


        // set the new dataset, and register the chart as a change listener...
        this.dataset = dataset;
        if (dataset != null) {

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        int x = this.seriesNeedle.length;
        int current = 0;
        double value = 0;
        int i = (this.datasets.length - 1);
        for (; i >= 0; --i) {
            ValueDataset data = this.datasets[i];


            if (data != null && data.getValue() != null) {
                value = (data.getValue().doubleValue())
                    % this.revolutionDistance;
                value = value / this.revolutionDistance * 360;
                current = i % x;
                this.seriesNeedle[current].draw(g2, needleArea, value);
            }

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     * @param index  the dataset index.
     *
     * @return The dataset (possibly {@code null}).
     */
    public ValueDataset getDataset(int index) {
        ValueDataset result = null;
        if (this.datasets.size() > index) {
            result = (ValueDataset) this.datasets.get(index);
        }
        return result;
    }

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     * @param index  the dataset index.
     * @param dataset  the dataset ({@code null} permitted).
     */
    public void setDataset(int index, ValueDataset dataset) {


        ValueDataset existing = (ValueDataset) this.datasets.get(index);
        if (existing != null) {
            existing.removeChangeListener(this);
        }
        this.datasets.set(index, dataset);
        if (dataset != null) {
            dataset.addChangeListener(this);
        }

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     *
     * @return The data value.
     */
    public double getValue(int datasetIndex) {
        double result = Double.NaN;
        ValueDataset dataset = getDataset(datasetIndex);
        if (dataset != null) {
            Number n = dataset.getValue();
            if (n != null) {
                result = n.doubleValue();
            }
        }
        return result;

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