numberaxis.java

来自「JfreeChart 常用图表例子」· Java 代码 · 共 1,302 行 · 第 1/4 页

            selectVerticalAutoTickUnit(g2, dataArea, edge);
        }

    }

    /**
     * Selects an appropriate tick value for the axis.  The strategy is to
     * display as many ticks as possible (selected from an array of 'standard'
     * tick units) without the labels overlapping.
     *
     * @param g2  the graphics device.
     * @param dataArea  the area defined by the axes.
     * @param edge  the axis location.
     */
   protected void selectHorizontalAutoTickUnit(Graphics2D g2,
                                               Rectangle2D dataArea,
                                               RectangleEdge edge) {

        double tickLabelWidth = estimateMaximumTickLabelWidth(
            g2, getTickUnit()
        );

        // start with the current tick unit...
        TickUnitSource tickUnits = getStandardTickUnits();
        TickUnit unit1 = tickUnits.getCeilingTickUnit(getTickUnit());
        double unit1Width = lengthToJava2D(unit1.getSize(), dataArea, edge);

        // then extrapolate...
        double guess = (tickLabelWidth / unit1Width) * unit1.getSize();

        NumberTickUnit unit2 
            = (NumberTickUnit) tickUnits.getCeilingTickUnit(guess);
        double unit2Width = lengthToJava2D(unit2.getSize(), dataArea, edge);

        tickLabelWidth = estimateMaximumTickLabelWidth(g2, unit2);
        if (tickLabelWidth > unit2Width) {
            unit2 = (NumberTickUnit) tickUnits.getLargerTickUnit(unit2);
        }

        setTickUnit(unit2, false, false);

    }

    /**
     * Selects an appropriate tick value for the axis.  The strategy is to
     * display as many ticks as possible (selected from an array of 'standard'
     * tick units) without the labels overlapping.
     *
     * @param g2  the graphics device.
     * @param dataArea  the area in which the plot should be drawn.
     * @param edge  the axis location.
     */
    protected void selectVerticalAutoTickUnit(Graphics2D g2, 
                                              Rectangle2D dataArea, 
                                              RectangleEdge edge) {

        double tickLabelHeight = estimateMaximumTickLabelHeight(g2);

        // start with the current tick unit...
        TickUnitSource tickUnits = getStandardTickUnits();
        TickUnit unit1 = tickUnits.getCeilingTickUnit(getTickUnit());
        double unitHeight = lengthToJava2D(unit1.getSize(), dataArea, edge);

        // then extrapolate...
        double guess = (tickLabelHeight / unitHeight) * unit1.getSize();
        
        NumberTickUnit unit2 
            = (NumberTickUnit) tickUnits.getCeilingTickUnit(guess);
        double unit2Height = lengthToJava2D(unit2.getSize(), dataArea, edge);

        tickLabelHeight = estimateMaximumTickLabelHeight(g2);
        if (tickLabelHeight > unit2Height) {
            unit2 = (NumberTickUnit) tickUnits.getLargerTickUnit(unit2);
        }

        setTickUnit(unit2, false, false);

    }
    
    /**
     * Calculates the positions of the tick labels for the axis, storing the 
     * results in the tick label list (ready for drawing).
     *
     * @param g2  the graphics device.
     * @param state  the axis state.
     * @param dataArea  the area in which the plot should be drawn.
     * @param edge  the location of the axis.
     * 
     * @return A list of ticks.
     *
     */
    public List refreshTicks(Graphics2D g2, 
                             AxisState state,
                             Rectangle2D dataArea,
                             RectangleEdge edge) {

        List result = new java.util.ArrayList();
        if (RectangleEdge.isTopOrBottom(edge)) {
            result = refreshTicksHorizontal(g2, dataArea, edge);
        }
        else if (RectangleEdge.isLeftOrRight(edge)) {
            result = refreshTicksVertical(g2, dataArea, edge);
        }
        return result;

    }

    /**
     * Calculates the positions of the tick labels for the axis, storing the 
     * results in the tick label list (ready for drawing).
     *
     * @param g2  the graphics device.
     * @param dataArea  the area in which the data should be drawn.
     * @param edge  the location of the axis.
     * 
     * @return A list of ticks.
     */
    protected List refreshTicksHorizontal(Graphics2D g2,
                                          Rectangle2D dataArea,
                                          RectangleEdge edge) {

        List result = new java.util.ArrayList();

        Font tickLabelFont = getTickLabelFont();
        g2.setFont(tickLabelFont);
        
        if (isAutoTickUnitSelection()) {
            selectAutoTickUnit(g2, dataArea, edge);
        }

        double size = getTickUnit().getSize();
        int count = calculateVisibleTickCount();
        double lowestTickValue = calculateLowestVisibleTickValue();

        if (count <= ValueAxis.MAXIMUM_TICK_COUNT) {
            for (int i = 0; i < count; i++) {
                double currentTickValue = lowestTickValue + (i * size);
                String tickLabel;
                NumberFormat formatter = getNumberFormatOverride();
                if (formatter != null) {
                    tickLabel = formatter.format(currentTickValue);
                }
                else {
                    tickLabel = getTickUnit().valueToString(currentTickValue);
                }
                TextAnchor anchor = null;
                TextAnchor rotationAnchor = null;
                double angle = 0.0;
                if (isVerticalTickLabels()) {
                    anchor = TextAnchor.CENTER_RIGHT;
                    rotationAnchor = TextAnchor.CENTER_RIGHT;
                    if (edge == RectangleEdge.TOP) {
                        angle = Math.PI / 2.0;
                    }
                    else {
                        angle = -Math.PI / 2.0;
                    }
                }
                else {
                    if (edge == RectangleEdge.TOP) {
                        anchor = TextAnchor.BOTTOM_CENTER;
                        rotationAnchor = TextAnchor.BOTTOM_CENTER;
                    }
                    else {
                        anchor = TextAnchor.TOP_CENTER;
                        rotationAnchor = TextAnchor.TOP_CENTER;
                    }
                }

                Tick tick = new NumberTick(
                    new Double(currentTickValue), tickLabel, anchor, 
                    rotationAnchor, angle
                );
                result.add(tick);
            }
        }
        return result;

    }

    /**
     * Calculates the positions of the tick labels for the axis, storing the 
     * results in the tick label list (ready for drawing).
     *
     * @param g2  the graphics device.
     * @param dataArea  the area in which the plot should be drawn.
     * @param edge  the location of the axis.
     * 
     * @return A list of ticks.
     *
     */
    protected List refreshTicksVertical(Graphics2D g2,
                                        Rectangle2D dataArea,
                                        RectangleEdge edge) {

        List result = new java.util.ArrayList();
        result.clear();

        Font tickLabelFont = getTickLabelFont();
        g2.setFont(tickLabelFont);
        if (isAutoTickUnitSelection()) {
            selectAutoTickUnit(g2, dataArea, edge);
        }

        double size = getTickUnit().getSize();
        int count = calculateVisibleTickCount();
        double lowestTickValue = calculateLowestVisibleTickValue();

        if (count <= ValueAxis.MAXIMUM_TICK_COUNT) {
            for (int i = 0; i < count; i++) {
                double currentTickValue = lowestTickValue + (i * size);
                String tickLabel;
                NumberFormat formatter = getNumberFormatOverride();
                if (formatter != null) {
                    tickLabel = formatter.format(currentTickValue);
                }
                else {
                    tickLabel = getTickUnit().valueToString(currentTickValue);
                }

                TextAnchor anchor = null;
                TextAnchor rotationAnchor = null;
                double angle = 0.0;
                if (isVerticalTickLabels()) {
                    if (edge == RectangleEdge.LEFT) { 
                        anchor = TextAnchor.BOTTOM_CENTER;
                        rotationAnchor = TextAnchor.BOTTOM_CENTER;
                        angle = -Math.PI / 2.0;
                    }
                    else {
                        anchor = TextAnchor.BOTTOM_CENTER;
                        rotationAnchor = TextAnchor.BOTTOM_CENTER;
                        angle = Math.PI / 2.0;
                    }
                }
                else {
                    if (edge == RectangleEdge.LEFT) {
                        anchor = TextAnchor.CENTER_RIGHT;
                        rotationAnchor = TextAnchor.CENTER_RIGHT;
                    }
                    else {
                        anchor = TextAnchor.CENTER_LEFT;
                        rotationAnchor = TextAnchor.CENTER_LEFT;
                    }
                }

                Tick tick = new NumberTick(
                    new Double(currentTickValue), tickLabel, anchor, 
                    rotationAnchor, angle
                );
                result.add(tick);
            }
        }
        return result;

    }
    
    /**
     * Returns a clone of the axis.
     * 
     * @return A clone
     * 
     * @throws CloneNotSupportedException if some component of the axis does 
     *         not support cloning.
     */
    public Object clone() throws CloneNotSupportedException {
        NumberAxis clone = (NumberAxis) super.clone();
        if (this.numberFormatOverride != null) {
            clone.numberFormatOverride 
                = (NumberFormat) this.numberFormatOverride.clone();
        }
        return clone;
    }

    /**
     * Tests an object for equality with this instance.
     * 
     * @param obj  the object.
     * 
     * @return A boolean.
     */    
    public boolean equals(Object obj) {           
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof NumberAxis)) {
            return false;
        }
        if (!super.equals(obj)) {
            return false;
        }
        NumberAxis that = (NumberAxis) obj;        
        if (this.autoRangeIncludesZero != that.autoRangeIncludesZero) {
            return false;
        }
        if (this.autoRangeStickyZero != that.autoRangeStickyZero) {
            return false;
        }
        if (!ObjectUtilities.equal(this.tickUnit, that.tickUnit)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.numberFormatOverride, 
                that.numberFormatOverride)) {
            return false;
        }        
        return true; 
    }
    
    /**
     * Returns a hash code for this object.
     * 
     * @return A hash code.
     */
    public int hashCode() {
        if (getLabel() != null) {
            return getLabel().hashCode();
        }
        else {
            return 0;
        }
    }

}