layeredbarrenderer.java

用于制作报表的中间件控件,纯java编写,还附带有数据库操作的源代码

            if (value >= uclip) {
                value = uclip;
            }
            else {
                if (value <= lclip) {
                    value = lclip;
                }
            }
        }
        else { // cases 9, 10, 11 and 12
            if (value <= lclip) {
                return; // bar is not visible
            }
            base = lclip;
            if (value >= uclip) {
                value = uclip;
            }
        }

        RectangleEdge edge = plot.getRangeAxisEdge();
        double transX1 = rangeAxis.valueToJava2D(base, dataArea, edge);
        double transX2 = rangeAxis.valueToJava2D(value, dataArea, edge);
        double rectX = Math.min(transX1, transX2);
        double rectWidth = Math.abs(transX2 - transX1);

        // Y
        double rectY = domainAxis.getCategoryMiddle(column, getColumnCount(), 
                dataArea, plot.getDomainAxisEdge()) - state.getBarWidth() / 2.0;

        int seriesCount = getRowCount();

        // draw the bar...
        double shift = 0.0;
        double rectHeight = 0.0;
        double widthFactor = 1.0;
        double seriesBarWidth = getSeriesBarWidth(row);
        if (!Double.isNaN(seriesBarWidth)) {
            widthFactor = seriesBarWidth;
        } 
        rectHeight = widthFactor * state.getBarWidth();
        rectY = rectY + (1 - widthFactor) * state.getBarWidth() / 2.0;
        if (seriesCount > 1) {
            shift = rectHeight * 0.20 / (seriesCount - 1);
        }

        Rectangle2D bar = new Rectangle2D.Double(rectX, 
                (rectY + ((seriesCount - 1 - row) * shift)), rectWidth, 
                (rectHeight - (seriesCount - 1 - row) * shift * 2));

        Paint itemPaint = getItemPaint(row, column);
        GradientPaintTransformer t = getGradientPaintTransformer();
        if (t != null && itemPaint instanceof GradientPaint) {
            itemPaint = t.transform((GradientPaint) itemPaint, bar);
        }
        g2.setPaint(itemPaint);
        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);
            }
        }

        CategoryItemLabelGenerator generator 
            = getItemLabelGenerator(row, column);
        if (generator != null && isItemLabelVisible(row, column)) {
            drawItemLabel(g2, data, row, column, plot, generator, bar, 
                    (transX1 > transX2));
        }        

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

    /**
     * Draws the bar for a single (series, category) data item.
     *
     * @param g2  the graphics device.
     * @param state  the renderer state.
     * @param dataArea  the data area.
     * @param plot  the plot.
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param data  the data.
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     */
    protected void drawVerticalItem(Graphics2D g2,
                                    CategoryItemRendererState state,
                                    Rectangle2D dataArea,
                                    CategoryPlot plot,
                                    CategoryAxis domainAxis,
                                    ValueAxis rangeAxis,
                                    CategoryDataset data,
                                    int row,
                                    int column) {

        // nothing is drawn for null values...
        Number dataValue = data.getValue(row, column);
        if (dataValue == null) {
            return;
        }

        // BAR X
        double rectX = domainAxis.getCategoryMiddle(column, getColumnCount(), 
                dataArea, plot.getDomainAxisEdge()) - state.getBarWidth() / 2.0;

        int seriesCount = getRowCount();

        // BAR Y
        double value = dataValue.doubleValue();
        double base = 0.0;
        double lclip = getLowerClip();
        double uclip = getUpperClip();

        if (uclip <= 0.0) {  // cases 1, 2, 3 and 4
            if (value >= uclip) {
                return; // bar is not visible
            }
            base = uclip;
            if (value <= lclip) {
                value = lclip;
            }
        }
        else if (lclip <= 0.0) { // cases 5, 6, 7 and 8
            if (value >= uclip) {
                value = uclip;
            }
            else {
                if (value <= lclip) {
                    value = lclip;
                }
            }
        }
        else { // cases 9, 10, 11 and 12
            if (value <= lclip) {
                return; // bar is not visible
            }
            base = getLowerClip();
            if (value >= uclip) {
               value = uclip;
            }
        }

        RectangleEdge edge = plot.getRangeAxisEdge();
        double transY1 = rangeAxis.valueToJava2D(base, dataArea, edge);
        double transY2 = rangeAxis.valueToJava2D(value, dataArea, edge);
        double rectY = Math.min(transY2, transY1);

        double rectWidth = state.getBarWidth();
        double rectHeight = Math.abs(transY2 - transY1);

        // draw the bar...
        double shift = 0.0;
        rectWidth = 0.0;
        double widthFactor = 1.0;
        double seriesBarWidth = getSeriesBarWidth(row);
        if (!Double.isNaN(seriesBarWidth)) {
            widthFactor = seriesBarWidth;
        } 
        rectWidth = widthFactor * state.getBarWidth();
        rectX = rectX + (1 - widthFactor) * state.getBarWidth() / 2.0;
        if (seriesCount > 1) {
            // needs to be improved !!!
            shift = rectWidth * 0.20 / (seriesCount - 1);
        }

        Rectangle2D bar = new Rectangle2D.Double(
            (rectX + ((seriesCount - 1 - row) * shift)), rectY,
            (rectWidth - (seriesCount - 1 - row) * shift * 2), rectHeight);
        Paint itemPaint = getItemPaint(row, column);
        GradientPaintTransformer t = getGradientPaintTransformer();
        if (t != null && itemPaint instanceof GradientPaint) {
            itemPaint = t.transform((GradientPaint) itemPaint, bar);
        }
        g2.setPaint(itemPaint);
        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);
            }
        }

        // draw the item labels if there are any...
        double transX1 = rangeAxis.valueToJava2D(base, dataArea, edge);
        double transX2 = rangeAxis.valueToJava2D(value, dataArea, edge);

        CategoryItemLabelGenerator generator 
            = getItemLabelGenerator(row, column);
        if (generator != null && isItemLabelVisible(row, column)) {
            drawItemLabel(g2, data, row, column, plot, generator, bar, 
                    (transX1 > transX2));
        }        

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

}