stackedarearenderer.java

提供JFreechart图表功能, 提供JFreechart图表功能,提供JFreechart图表功能

        GeneralPath right = new GeneralPath();
        if (y1 >= 0.0) {  // handle positive value
            transY1 = (float) rangeAxis.valueToJava2D(y1 + stack1[1], dataArea, 
                    edge1);
            float transStack1 = (float) rangeAxis.valueToJava2D(stack1[1], 
                    dataArea, edge1);
            float transStackLeft = (float) rangeAxis.valueToJava2D(
                    adjStackLeft[1], dataArea, edge1);
            
            // LEFT POLYGON
            if (y0 >= 0.0) {
                double yleft = (y0 + y1) / 2.0 + stackLeft[1];
                float transYLeft 
                    = (float) rangeAxis.valueToJava2D(yleft, dataArea, edge1);
                left.moveTo((float) xx1, transY1);
                left.lineTo((float) xx1, transStack1);
                left.lineTo((float) xxLeft, transStackLeft);
                left.lineTo((float) xxLeft, transYLeft);
                left.closePath();
            }
            else {
                left.moveTo((float) xx1, transStack1);
                left.lineTo((float) xx1, transY1);
                left.lineTo((float) xxLeft, transStackLeft);
                left.closePath();
            }

            float transStackRight = (float) rangeAxis.valueToJava2D(
                    adjStackRight[1], dataArea, edge1);
            // RIGHT POLYGON
            if (y2 >= 0.0) {
                double yright = (y1 + y2) / 2.0 + stackRight[1];
                float transYRight 
                    = (float) rangeAxis.valueToJava2D(yright, dataArea, edge1);
                right.moveTo((float) xx1, transStack1);
                right.lineTo((float) xx1, transY1);
                right.lineTo((float) xxRight, transYRight);
                right.lineTo((float) xxRight, transStackRight);
                right.closePath();
            }
            else {
                right.moveTo((float) xx1, transStack1);
                right.lineTo((float) xx1, transY1);
                right.lineTo((float) xxRight, transStackRight);
                right.closePath();
            }
        }
        else {  // handle negative value 
            transY1 = (float) rangeAxis.valueToJava2D(y1 + stack1[0], dataArea,
                    edge1);
            float transStack1 = (float) rangeAxis.valueToJava2D(stack1[0], 
                    dataArea, edge1);
            float transStackLeft = (float) rangeAxis.valueToJava2D(
                    adjStackLeft[0], dataArea, edge1);

            // LEFT POLYGON
            if (y0 >= 0.0) {
                left.moveTo((float) xx1, transStack1);
                left.lineTo((float) xx1, transY1);
                left.lineTo((float) xxLeft, transStackLeft);
                left.clone();
            }
            else {
                double yleft = (y0 + y1) / 2.0 + stackLeft[0];
                float transYLeft = (float) rangeAxis.valueToJava2D(yleft, 
                        dataArea, edge1);
                left.moveTo((float) xx1, transY1);
                left.lineTo((float) xx1, transStack1);
                left.lineTo((float) xxLeft, transStackLeft);
                left.lineTo((float) xxLeft, transYLeft);
                left.closePath();
            }
            float transStackRight = (float) rangeAxis.valueToJava2D(
                    adjStackRight[0], dataArea, edge1);
            
            // RIGHT POLYGON
            if (y2 >= 0.0) {
                right.moveTo((float) xx1, transStack1);
                right.lineTo((float) xx1, transY1);
                right.lineTo((float) xxRight, transStackRight);
                right.closePath();
            }
            else {
                double yright = (y1 + y2) / 2.0 + stackRight[0];
                float transYRight = (float) rangeAxis.valueToJava2D(yright, 
                        dataArea, edge1);
                right.moveTo((float) xx1, transStack1);
                right.lineTo((float) xx1, transY1);
                right.lineTo((float) xxRight, transYRight);
                right.lineTo((float) xxRight, transStackRight);
                right.closePath();
            }
        }

        g2.setPaint(getItemPaint(row, column));
        g2.setStroke(getItemStroke(row, column));

        //  Get series Paint and Stroke
        Paint itemPaint = getItemPaint(row, column);
        if (pass == 0) {
            g2.setPaint(itemPaint);
            g2.fill(left);
            g2.fill(right);
        } 
        
        // add an entity for the item...
        if (entities != null) {
            GeneralPath gp = new GeneralPath(left);
            gp.append(right, false);
            entityArea = gp;
            addItemEntity(entities, dataset, row, column, entityArea);
        }
        
    }

    /**
     * Calculates the stacked value of the all series up to, but not including 
     * <code>series</code> for the specified category, <code>category</code>.  
     * It returns 0.0 if <code>series</code> is the first series, i.e. 0.
     *
     * @param dataset  the dataset (<code>null</code> not permitted).
     * @param series  the series.
     * @param category  the category.
     *
     * @return double returns a cumulative value for all series' values up to 
     *         but excluding <code>series</code> for Object 
     *         <code>category</code>.
     */
    protected double getPreviousHeight(CategoryDataset dataset, 
                                       int series, int category) {

        double result = 0.0;
        Number n;
        double total = 0.0;
        if (this.renderAsPercentages) {
            total = DataUtilities.calculateColumnTotal(dataset, category);
        }
        for (int i = 0; i < series; i++) {
            n = dataset.getValue(i, category);
            if (n != null) {
                double v = n.doubleValue();
                if (this.renderAsPercentages) {
                    v = v / total;
                }
                result += v;
            }
        }
        return result;

    }

    /**
     * Calculates the stacked values (one positive and one negative) of all 
     * series up to, but not including, <code>series</code> for the specified 
     * item. It returns [0.0, 0.0] if <code>series</code> is the first series.
     *
     * @param dataset  the dataset (<code>null</code> not permitted).
     * @param series  the series index.
     * @param index  the item index.
     *
     * @return An array containing the cumulative negative and positive values
     *     for all series values up to but excluding <code>series</code> 
     *     for <code>index</code>.
     */
    protected double[] getStackValues(CategoryDataset dataset, 
            int series, int index) {
        double[] result = new double[2];
        for (int i = 0; i < series; i++) {
            if (isSeriesVisible(i)) {
                double v = 0.0;
                Number n = dataset.getValue(i, index);
                if (n != null) {
                    v = n.doubleValue();
                }
                if (!Double.isNaN(v)) {
                    if (v >= 0.0) {
                        result[1] += v;   
                    }
                    else {
                        result[0] += v;   
                    }
                }
            }
        }
        return result;
    }

    /**
     * Returns a pair of "stack" values calculated as the mean of the two 
     * specified stack value pairs.
     * 
     * @param stack1  the first stack pair.
     * @param stack2  the second stack pair.
     * 
     * @return A pair of average stack values.
     */
    private double[] averageStackValues(double[] stack1, double[] stack2) {
        double[] result = new double[2];
        result[0] = (stack1[0] + stack2[0]) / 2.0;
        result[1] = (stack1[1] + stack2[1]) / 2.0;
        return result;
    }

    /**
     * Calculates adjusted stack values from the supplied values.  The value is
     * the mean of the supplied values, unless either of the supplied values
     * is zero, in which case the adjusted value is zero also.
     * 
     * @param stack1  the first stack pair.
     * @param stack2  the second stack pair.
     * 
     * @return A pair of average stack values.
     */
    private double[] adjustedStackValues(double[] stack1, double[] stack2) {
        double[] result = new double[2];
        if (stack1[0] == 0.0 || stack2[0] == 0.0) {
            result[0] = 0.0;   
        }
        else {
            result[0] = (stack1[0] + stack2[0]) / 2.0;
        }
        if (stack1[1] == 0.0 || stack2[1] == 0.0) {
            result[1] = 0.0;   
        }
        else {
            result[1] = (stack1[1] + stack2[1]) / 2.0;
        }
        return result;
    }

    /**
     * Checks this instance for equality with an arbitrary object.
     *
     * @param obj  the object (<code>null</code> not permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof StackedAreaRenderer)) {
            return false;
        }
        StackedAreaRenderer that = (StackedAreaRenderer) obj;
        if (this.renderAsPercentages != that.renderAsPercentages) {
            return false;
        }
        return super.equals(obj);
    }
}