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📄 xybarrenderer.java

📁 jfreechart安装程序和使用说明
💻 JAVA
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     * {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param draw  the flag.
     */
    public void setDrawBarOutline(boolean draw) {
        this.drawBarOutline = draw;
        notifyListeners(new RendererChangeEvent(this));
    }
    
    /**
     * Returns the gradient paint transformer (an object used to transform gradient paint objects
     * to fit each bar.
     * 
     * @return A transformer (<code>null</code> possible).
     */    
    public GradientPaintTransformer getGradientPaintTransformer() {
        return this.gradientPaintTransformer;    
    }
    
    /**
     * Sets the gradient paint transformer and sends a {@link RendererChangeEvent} to all registered
     * listeners.
     * 
     * @param transformer  the transformer (<code>null</code> permitted).
     */
    public void setGradientPaintTransformer(GradientPaintTransformer transformer) {
        this.gradientPaintTransformer = transformer;
        notifyListeners(new RendererChangeEvent(this));
    }
    
    /**
     * Initialises the renderer and returns a state object that should be passed to all subsequent
     * calls to the drawItem() method.  Here we calculate the Java2D y-coordinate for zero, since 
     * all the bars have their bases fixed at zero.
     *
     * @param g2  the graphics device.
     * @param dataArea  the area inside the axes.
     * @param plot  the plot.
     * @param dataset  the data.
     * @param info  an optional info collection object to return data back to the caller.
     *
     * @return A state object.
     */
    public XYItemRendererState initialise(Graphics2D g2, 
                                          Rectangle2D dataArea, 
                                          XYPlot plot, 
                                          XYDataset dataset,
                                          PlotRenderingInfo info) {

        XYBarRendererState state = new XYBarRendererState(info);
        ValueAxis rangeAxis = plot.getRangeAxisForDataset(plot.indexOf(dataset));
        state.setG2Base(rangeAxis.valueToJava2D(this.base, dataArea, plot.getRangeAxisEdge()));
        return state;

    }

    /**
     * Draws the visual representation of a single data item.
     *
     * @param g2  the graphics device.
     * @param state  the renderer state.
     * @param dataArea  the area within which the plot is being drawn.
     * @param info  collects information about the drawing.
     * @param plot  the plot (can be used to obtain standard color information etc).
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param dataset  the dataset.
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     * @param crosshairState  crosshair information for the plot (<code>null</code> permitted).
     * @param pass  the pass index.
     */
    public void drawItem(Graphics2D g2,
                         XYItemRendererState state,
                         Rectangle2D dataArea,
                         PlotRenderingInfo info,
                         XYPlot plot, 
                         ValueAxis domainAxis, 
                         ValueAxis rangeAxis,
                         XYDataset dataset, 
                         int series, 
                         int item,
                         CrosshairState crosshairState,
                         int pass) {

        IntervalXYDataset intervalDataset = (IntervalXYDataset) dataset;

        double value0;
        double value1;
        if (this.useYInterval) {
            value0 = intervalDataset.getStartYValue(series, item);
            value1 = intervalDataset.getEndYValue(series, item);
        }
        else {
            value0 = this.base;
            value1 = intervalDataset.getYValue(series, item);
        }
        if (Double.isNaN(value0) || Double.isNaN(value1)) {
            return;
        }

        double translatedValue0 = rangeAxis.valueToJava2D(
            value0, dataArea, plot.getRangeAxisEdge()
        );
        double translatedValue1 = rangeAxis.valueToJava2D(
            value1, dataArea, plot.getRangeAxisEdge()
        );

        RectangleEdge location = plot.getDomainAxisEdge();
        Number startXNumber = intervalDataset.getStartX(series, item);
        if (startXNumber == null) {
            return;
        }
        double translatedStartX = domainAxis.valueToJava2D(
            startXNumber.doubleValue(), dataArea, location
        );

        Number endXNumber = intervalDataset.getEndX(series, item);
        if (endXNumber == null) {
            return;
        }
        double translatedEndX = domainAxis.valueToJava2D(
            endXNumber.doubleValue(), dataArea, location
        );

        double translatedWidth = Math.max(1, Math.abs(translatedEndX - translatedStartX));
        double translatedHeight = Math.abs(translatedValue1 - translatedValue0);

        if (getMargin() > 0.0) {
            double cut = translatedWidth * getMargin();
            translatedWidth = translatedWidth - cut;
            translatedStartX = translatedStartX + cut / 2;
        }

        Rectangle2D bar = null;
        PlotOrientation orientation = plot.getOrientation();
        if (orientation == PlotOrientation.HORIZONTAL) {
            bar = new Rectangle2D.Double(
                Math.min(translatedValue0, translatedValue1), translatedEndX,
                translatedHeight, translatedWidth
            );
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            bar = new Rectangle2D.Double(
                translatedStartX, Math.min(translatedValue0, translatedValue1), 
                translatedWidth, translatedHeight
            );
        }

        Paint itemPaint = getItemPaint(series, item);
        if (getGradientPaintTransformer() != null && itemPaint instanceof GradientPaint) {
            GradientPaint gp = (GradientPaint) itemPaint;
            itemPaint = getGradientPaintTransformer().transform(gp, bar);
        }
        g2.setPaint(itemPaint);
        g2.fill(bar);
        if (isDrawBarOutline() && Math.abs(translatedEndX - translatedStartX) > 3) {
            Stroke stroke = getItemOutlineStroke(series, item);
            Paint paint = getItemOutlinePaint(series, item);
            if (stroke != null && paint != null) {
                g2.setStroke(stroke);
                g2.setPaint(paint);
                g2.draw(bar);                
            }
        }

        // add an entity for the item...
        if (info != null) {
            EntityCollection entities = info.getOwner().getEntityCollection();
            if (entities != null) {
                String tip = null;
                XYToolTipGenerator generator = getToolTipGenerator(series, item);
                if (generator != null) {
                    tip = generator.generateToolTip(dataset, series, item);
                }
                String url = null;
                if (getURLGenerator() != null) {
                    url = getURLGenerator().generateURL(dataset, series, item);
                }
                XYItemEntity entity = new XYItemEntity(bar, dataset, series, item, tip, url);
                entities.addEntity(entity);
            }
        }

    }

    /**
     * Returns a clone of the renderer.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException  if the renderer cannot be cloned.
     */
    public Object clone() throws CloneNotSupportedException {
        XYBarRenderer result = (XYBarRenderer) super.clone();
        if (this.gradientPaintTransformer != null) {
            if (this.gradientPaintTransformer instanceof PublicCloneable) {
                PublicCloneable pc = (PublicCloneable) this.gradientPaintTransformer;
                result.gradientPaintTransformer = (GradientPaintTransformer) pc.clone();
            }
            else {
                throw new CloneNotSupportedException(
                    "GradientPaintTransformer doesn't implement PublicCloneable"
                );
            }
        }
        return result;
    }

    /**
     * Tests this renderer for equality with an arbitrary object.
     * 
     * @param obj  the object to test against (<code>null</code> permitted).
     * 
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof XYBarRenderer)) {
            return false;
        }
        if (!super.equals(obj)) {
            return false;
        }
        XYBarRenderer that = (XYBarRenderer) obj;
        if (this.base != that.base) {
            return false;
        }
        if (this.drawBarOutline != that.drawBarOutline) {
            return false;
        }
        if (this.margin != that.margin) {
            return false;
        }
        if (this.useYInterval != that.useYInterval) {
            return false;
        }
        if (!ObjectUtils.equal(this.gradientPaintTransformer, that.gradientPaintTransformer)) {
            return false;
        }
        return true;
    }
    
}

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