waterfallbarrenderer.java

这是一个segy数据显示程序

     * @param dataArea  the data area.
     * @param plot  the plot.
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param dataset  the dataset.
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     */
    public void drawItem(Graphics2D g2,
                         CategoryItemRendererState state,
                         Rectangle2D dataArea,
                         CategoryPlot plot,
                         CategoryAxis domainAxis,
                         ValueAxis rangeAxis,
                         CategoryDataset dataset,
                         int row,
                         int column) {

        double previous = state.getSeriesRunningTotal();
        if (column == dataset.getColumnCount() - 1) {
            previous = 0.0;
        }
        double current = 0.0;
        Number n = dataset.getValue(row, column);
        if (n != null) {
            current = previous + n.doubleValue();
        }
        state.setSeriesRunningTotal(current);
        
        int seriesCount = getRowCount();
        int categoryCount = getColumnCount();
        PlotOrientation orientation = plot.getOrientation();
        
        double rectX = 0.0;
        double rectY = 0.0;

        RectangleEdge domainAxisLocation = plot.getDomainAxisEdge();
        RectangleEdge rangeAxisLocation = plot.getRangeAxisEdge();
        
        // Y0
        double j2dy0 = rangeAxis.valueToJava2D(previous, dataArea, rangeAxisLocation);

        // Y1
        double j2dy1 = rangeAxis.valueToJava2D(current, dataArea, rangeAxisLocation);

        double valDiff = current - previous;
        if (j2dy1 < j2dy0) {
            double temp = j2dy1;
            j2dy1 = j2dy0;
            j2dy0 = temp;
        }

        // BAR WIDTH
        double rectWidth = state.getBarWidth();

        // BAR HEIGHT
        double rectHeight = Math.max(getMinimumBarLength(), Math.abs(j2dy1 - j2dy0));

        if (orientation == PlotOrientation.HORIZONTAL) {
            // BAR Y
            rectY = domainAxis.getCategoryStart(column, getColumnCount(), dataArea, 
                                                domainAxisLocation);
            if (seriesCount > 1) {
                double seriesGap = dataArea.getHeight() * getItemMargin()
                                   / (categoryCount * (seriesCount - 1));
                rectY = rectY + row * (state.getBarWidth() + seriesGap);
            }
            else {
                rectY = rectY + row * state.getBarWidth();
            }
             
            rectX = j2dy0;
            rectHeight = state.getBarWidth();
            rectWidth = Math.max(getMinimumBarLength(), Math.abs(j2dy1 - j2dy0));

        }
        else if (orientation == PlotOrientation.VERTICAL) {
            // BAR X
            rectX = domainAxis.getCategoryStart(column, getColumnCount(), dataArea,
                                                domainAxisLocation);

            if (seriesCount > 1) {
                double seriesGap = dataArea.getWidth() * getItemMargin()
                                   / (categoryCount * (seriesCount - 1));
                rectX = rectX + row * (state.getBarWidth() + seriesGap);
            }
            else {
                rectX = rectX + row * state.getBarWidth();
            }

            rectY = j2dy0;
        }
        Rectangle2D bar = new Rectangle2D.Double(rectX, rectY, rectWidth, rectHeight);
        Paint seriesPaint = getFirstBarPaint();
        if (column == 0) {
            seriesPaint = getFirstBarPaint();
        }
        else if (column == categoryCount - 1) {
            seriesPaint = getLastBarPaint();    
        } 
        else {
            if (valDiff < 0.0) {
                seriesPaint = getNegativeBarPaint();
            } 
            else if (valDiff > 0.0) {
                seriesPaint = getPositiveBarPaint();
            } 
            else {
                seriesPaint = getLastBarPaint();
            }
        }
        if (getGradientPaintTransformer() != null && seriesPaint instanceof GradientPaint) {
            GradientPaint gp = (GradientPaint) seriesPaint;
            seriesPaint = getGradientPaintTransformer().transform(gp, bar);
        }
        g2.setPaint(seriesPaint);
        g2.fill(bar);
        
        // draw the outline...
        if (isDrawBarOutline() && state.getBarWidth() > BAR_OUTLINE_WIDTH_THRESHOLD) {
            Stroke stroke = getItemOutlineStroke(row, column);
            Paint paint = getItemOutlinePaint(row, column);
            if (stroke != null && paint != null) {
                g2.setStroke(stroke);
                g2.setPaint(paint);
                g2.draw(bar);
            }
        }
        
        CategoryLabelGenerator generator = getLabelGenerator(row, column);
        if (generator != null && isItemLabelVisible(row, column)) {
            drawItemLabel(g2, dataset, row, column, plot, generator, bar, (valDiff < 0.0));
        }        

        // collect entity and tool tip information...
        if (state.getInfo() != null) {
            EntityCollection entities = state.getInfo().getOwner().getEntityCollection();
            if (entities != null) {
                String tip = null;
                CategoryToolTipGenerator tipster = getToolTipGenerator(row, column);
                if (tipster != null) {
                    tip = tipster.generateToolTip(dataset, row, column);
                }
                String url = null;
                if (getItemURLGenerator(row, column) != null) {
                    url = getItemURLGenerator(row, column).generateURL(dataset, row, column);
                }
                CategoryItemEntity entity = new CategoryItemEntity(
                    bar, tip, url, dataset, row, dataset.getColumnKey(column), column
                );
                entities.addEntity(entity);
            }
        }

    }
    
    /**
     * Tests an object for equality with this instance.
     * 
     * @param object  the object.
     * 
     * @return A boolean.
     */
    public boolean equals(Object object) {
        
        if (object == null) {
            return false;
        }
        
        if (object == this) {
            return true;
        }
        
        if (super.equals(object) && (object instanceof WaterfallBarRenderer)) {

            WaterfallBarRenderer r = (WaterfallBarRenderer) object;
            boolean b0 = PaintUtils.equal(this.firstBarPaint, r.firstBarPaint);              
            boolean b1 = PaintUtils.equal(this.lastBarPaint, r.lastBarPaint);              
            boolean b2 = PaintUtils.equal(this.positiveBarPaint, r.positiveBarPaint);              
            boolean b3 = PaintUtils.equal(this.negativeBarPaint, r.negativeBarPaint);              
            return b0 && b1 && b2 && b3;
        }
        
        return false;
        
    }
    
    /**
     * Provides serialization support.
     *
     * @param stream  the output stream.
     *
     * @throws IOException  if there is an I/O error.
     */
    private void writeObject(ObjectOutputStream stream) throws IOException {

        stream.defaultWriteObject();
        SerialUtilities.writePaint(this.firstBarPaint, stream);
        SerialUtilities.writePaint(this.lastBarPaint, stream);
        SerialUtilities.writePaint(this.positiveBarPaint, stream);
        SerialUtilities.writePaint(this.negativeBarPaint, stream);

    }

    /**
     * Provides serialization support.
     *
     * @param stream  the input stream.
     *
     * @throws IOException  if there is an I/O error.
     * @throws ClassNotFoundException  if there is a classpath problem.
     */
    private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException {

        stream.defaultReadObject();
        this.firstBarPaint = SerialUtilities.readPaint(stream);
        this.lastBarPaint = SerialUtilities.readPaint(stream);
        this.positiveBarPaint = SerialUtilities.readPaint(stream);
        this.negativeBarPaint = SerialUtilities.readPaint(stream);

    }

}