subcategoryaxis.java

java图形利器

            double dim = 0.0;
            if (RectangleEdge.isLeftOrRight(edge)) {
                dim = bounds.getWidth();   
            }
            else {  // must be top or bottom
                dim = bounds.getHeight();
            }
            result = Math.max(result, dim);
        }   
        return result;
    }
    
    /**
     * Draws the axis on a Java 2D graphics device (such as the screen or a 
     * printer).
     *
     * @param g2  the graphics device (<code>null</code> not permitted).
     * @param cursor  the cursor location.
     * @param plotArea  the area within which the axis should be drawn 
     *                  (<code>null</code> not permitted).
     * @param dataArea  the area within which the plot is being drawn 
     *                  (<code>null</code> not permitted).
     * @param edge  the location of the axis (<code>null</code> not permitted).
     * @param plotState  collects information about the plot 
     *                   (<code>null</code> permitted).
     * 
     * @return The axis state (never <code>null</code>).
     */
    public AxisState draw(Graphics2D g2, 
                          double cursor, 
                          Rectangle2D plotArea, 
                          Rectangle2D dataArea,
                          RectangleEdge edge,
                          PlotRenderingInfo plotState) {
        
        // if the axis is not visible, don't draw it...
        if (!isVisible()) {
            return new AxisState(cursor);
        }
        
        if (isAxisLineVisible()) {
            drawAxisLine(g2, cursor, dataArea, edge);
        }

        // draw the category labels and axis label
        AxisState state = new AxisState(cursor);
        state = drawSubCategoryLabels(
            g2, plotArea, dataArea, edge, state, plotState
        );
        state = drawCategoryLabels(g2, plotArea, dataArea, edge, state, 
                plotState);
        state = drawLabel(getLabel(), g2, plotArea, dataArea, edge, state);
    
        return state;

    }
    
    /**
     * Draws the category labels and returns the updated axis state.
     *
     * @param g2  the graphics device (<code>null</code> not permitted).
     * @param plotArea  the plot area (<code>null</code> not permitted).
     * @param dataArea  the area inside the axes (<code>null</code> not 
     *                  permitted).
     * @param edge  the axis location (<code>null</code> not permitted).
     * @param state  the axis state (<code>null</code> not permitted).
     * @param plotState  collects information about the plot (<code>null</code> 
     *                   permitted).
     * 
     * @return The updated axis state (never <code>null</code>).
     */
    protected AxisState drawSubCategoryLabels(Graphics2D g2,
                                              Rectangle2D plotArea,
                                              Rectangle2D dataArea,
                                              RectangleEdge edge,
                                              AxisState state,
                                              PlotRenderingInfo plotState) {

        if (state == null) {
            throw new IllegalArgumentException("Null 'state' argument.");
        }

        g2.setFont(this.subLabelFont);
        g2.setPaint(this.subLabelPaint);
        CategoryPlot plot = (CategoryPlot) getPlot();
        CategoryDataset dataset = plot.getDataset();
        int categoryCount = dataset.getColumnCount();

        double maxdim = getMaxDim(g2, edge);
        for (int categoryIndex = 0; categoryIndex < categoryCount; 
             categoryIndex++) {

            double x0 = 0.0;
            double x1 = 0.0;
            double y0 = 0.0;
            double y1 = 0.0;
            if (edge == RectangleEdge.TOP) {
                x0 = getCategoryStart(categoryIndex, categoryCount, dataArea, 
                        edge);
                x1 = getCategoryEnd(categoryIndex, categoryCount, dataArea, 
                        edge);
                y1 = state.getCursor();
                y0 = y1 - maxdim;
            }
            else if (edge == RectangleEdge.BOTTOM) {
                x0 = getCategoryStart(categoryIndex, categoryCount, dataArea, 
                        edge);
                x1 = getCategoryEnd(categoryIndex, categoryCount, dataArea, 
                        edge); 
                y0 = state.getCursor();                   
                y1 = y0 + maxdim;
            }
            else if (edge == RectangleEdge.LEFT) {
                y0 = getCategoryStart(categoryIndex, categoryCount, dataArea, 
                        edge);
                y1 = getCategoryEnd(categoryIndex, categoryCount, dataArea, 
                        edge);
                x1 = state.getCursor();
                x0 = x1 - maxdim;
            }
            else if (edge == RectangleEdge.RIGHT) {
                y0 = getCategoryStart(categoryIndex, categoryCount, dataArea, 
                        edge);
                y1 = getCategoryEnd(categoryIndex, categoryCount, dataArea, 
                        edge);
                x0 = state.getCursor();
                x1 = x0 + maxdim;
            }
            Rectangle2D area = new Rectangle2D.Double(x0, y0, (x1 - x0), 
                    (y1 - y0));
            int subCategoryCount = this.subCategories.size();
            float width = (float) ((x1 - x0) / subCategoryCount);
            float height = (float) ((y1 - y0) / subCategoryCount);
            float xx = 0.0f;
            float yy = 0.0f;
            for (int i = 0; i < subCategoryCount; i++) {
                if (RectangleEdge.isTopOrBottom(edge)) {
                    xx = (float) (x0 + (i + 0.5) * width);
                    yy = (float) area.getCenterY();
                }
                else {
                    xx = (float) area.getCenterX();
                    yy = (float) (y0 + (i + 0.5) * height);                   
                }
                String label = this.subCategories.get(i).toString();
                TextUtilities.drawRotatedString(label, g2, xx, yy, 
                        TextAnchor.CENTER, 0.0, TextAnchor.CENTER);
            }
        }

        if (edge.equals(RectangleEdge.TOP)) {
            double h = maxdim;
            state.cursorUp(h);
        }
        else if (edge.equals(RectangleEdge.BOTTOM)) {
            double h = maxdim;
            state.cursorDown(h);
        }
        else if (edge == RectangleEdge.LEFT) {
            double w = maxdim;
            state.cursorLeft(w);
        }
        else if (edge == RectangleEdge.RIGHT) {
            double w = maxdim;
            state.cursorRight(w);
        }
        return state;
    }
    
    /**
     * Tests the axis for equality with an arbitrary object.
     * 
     * @param obj  the object (<code>null</code> permitted).
     * 
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (obj instanceof SubCategoryAxis && super.equals(obj)) {
            SubCategoryAxis axis = (SubCategoryAxis) obj;
            if (!this.subCategories.equals(axis.subCategories)) {
                return false;
            }
            if (!this.subLabelFont.equals(axis.subLabelFont)) {
                return false;   
            }
            if (!this.subLabelPaint.equals(axis.subLabelPaint)) {
                return false;   
            }
            return true;
        }
        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.subLabelPaint, 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.subLabelPaint = SerialUtilities.readPaint(stream);
    }
  
}