logarithmicaxis.java

这是一个segy数据显示程序

                if (currentTickValue > upperBoundVal) {
                    return ticks;   //if past highest data value then exit method
                }

                if (currentTickValue >= lowerBoundVal - SMALL_LOG_VALUE) {
                    //tick value not below lowest data value
                    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
                    );
                    ticks.add(tick);
                }
            }
        }
        return ticks;

    }

    /**
     * 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 cursor  the cursor position.
     * @param plotArea  the area in which the plot and the axes should be drawn.
     * @param dataArea  the area in which the plot should be drawn.
     * @param edge  the axis location.
     * 
     * @return A list of ticks.
     */
    public List refreshTicksVertical(Graphics2D g2, double cursor,
                                     Rectangle2D plotArea, Rectangle2D dataArea,
                                     RectangleEdge edge) {

        List ticks = new java.util.ArrayList();
        //FontMetrics fm = g2.getFontMetrics(getTickLabelFont());

        //get lower bound value:
        double lowerBoundVal = getRange().getLowerBound();
        //if small log values and lower bound value too small
        // then set to a small value (don't allow <= 0):
        if (this.smallLogFlag && lowerBoundVal < SMALL_LOG_VALUE) {
            lowerBoundVal = SMALL_LOG_VALUE;
        }
        //get upper bound value
        final double upperBoundVal = getRange().getUpperBound();

        //get log10 version of lower bound and round to integer:
        int iBegCount = (int) Math.rint(switchedLog10(lowerBoundVal));
        //get log10 version of upper bound and round to integer:
        final int iEndCount = (int) Math.rint(switchedLog10(upperBoundVal));

        if (iBegCount == iEndCount && iBegCount > 0 && Math.pow(10, iBegCount) > lowerBoundVal) {
              //only 1 power of 10 value, it's > 0 and its resulting
              // tick value will be larger than lower bound of data
          --iBegCount;       //decrement to generate more ticks
        }

        double tickVal;
        String tickLabel;
        boolean zeroTickFlag = false;
        for (int i = iBegCount; i <= iEndCount; i++) {
            //for each tick with a label to be displayed
            int jEndCount = 10;
            if (i == iEndCount) {
                jEndCount = 1;
            }

            for (int j = 0; j < jEndCount; j++) {
                //for each tick to be displayed
                if (this.smallLogFlag) {
                    //small log values in use
                    tickVal = Math.pow(10, i) + (Math.pow(10, i) * j);
                    if (j == 0) {
                        //first tick of group; create label text
                        if (this.log10TickLabelsFlag) {
                            //if flag then
                            tickLabel = "10^" + i;      //create "log10"-type label
                        }
                        else {    //not "log10"-type label
                            if (this.expTickLabelsFlag) {
                                //if flag then
                                tickLabel = "1e" + i;   //create "1e#"-type label
                            }
                            else {    //not "1e#"-type label
                                if (i >= 0) {   //if positive exponent then make integer
                                    NumberFormat format = getNumberFormatOverride();
                                    if (format != null) {
                                        tickLabel = format.format(tickVal);   
                                    }
                                    else {
                                        tickLabel =  Long.toString((long) Math.rint(tickVal));   
                                    }
                                }
                                else {
                                    //negative exponent; create fractional value
                                    //set exact number of fractional digits to be shown:
                                    this.numberFormatterObj.setMaximumFractionDigits(-i);
                                    //create tick label:
                                    tickLabel = this.numberFormatterObj.format(tickVal);
                                }
                            }
                        }
                    }
                    else {   //not first tick to be displayed
                        tickLabel = "";     //no tick label
                    }
                }
                else { //not small log values in use; allow for values <= 0
                    if (zeroTickFlag) {      //if did zero tick last iter then
                        --j;
                    }               //decrement to do 1.0 tick now
                    tickVal = (i >= 0) ? Math.pow(10, i) + (Math.pow(10, i) * j)
                                       : -(Math.pow(10, -i) - (Math.pow(10, -i - 1) * j));
                    if (j == 0) {  //first tick of group
                        if (!zeroTickFlag) {     //did not do zero tick last iteration
                            if (i > iBegCount && i < iEndCount
                                              && Math.abs(tickVal - 1.0) < 0.0001) {
                                //not first or last tick on graph and value is 1.0
                                tickVal = 0.0;        //change value to 0.0
                                zeroTickFlag = true;  //indicate zero tick
                                tickLabel = "0";      //create label for tick
                            }
                            else {
                                //first or last tick on graph or value is 1.0
                                //create label for tick:
                                if (this.log10TickLabelsFlag) {
                                       //create "log10"-type label
                                    tickLabel = (((i < 0) ? "-" : "") + "10^" + Math.abs(i));
                                }
                                else {
                                    if (this.expTickLabelsFlag) {
                                           //create "1e#"-type label
                                        tickLabel = (((i < 0) ? "-" : "") + "1e" + Math.abs(i));
                                    }
                                    else {
                                        NumberFormat format = getNumberFormatOverride();
                                        if (format != null) {
                                            tickLabel = format.format(tickVal);   
                                        }
                                        else {
                                            tickLabel =  Long.toString((long) Math.rint(tickVal));
                                        }
                                    }
                                }
                            }
                        }
                        else {     // did zero tick last iteration
                            tickLabel = "";         //no label
                            zeroTickFlag = false;   //clear flag
                        }
                    }
                    else {       // not first tick of group
                        tickLabel = "";           //no label
                        zeroTickFlag = false;     //make sure flag cleared
                    }
                }

                if (tickVal > upperBoundVal) {
                    return ticks;     //if past highest data value then exit method
                }

                if (tickVal >= lowerBoundVal - SMALL_LOG_VALUE) {
                    //tick value not below lowest data value
                    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;
                        }
                    }
                    //create tick object and add to list:
                    ticks.add(
                        new NumberTick(
                            new Double(tickVal), tickLabel, anchor, rotationAnchor, angle
                        )
                    );

                }
            }
        }
        return ticks;
    }

    /**
     * Converts the given value to a tick label string.
     *
     * @param val the value to convert.
     * @param forceFmtFlag true to force the number-formatter object
     * to be used.
     *
     * @return The tick label string.
     */
    protected String makeTickLabel(double val, boolean forceFmtFlag) {
        if (this.expTickLabelsFlag || forceFmtFlag) {
            //using exponents or force-formatter flag is set
            // (convert 'E' to lower-case 'e'):
            return this.numberFormatterObj.format(val).toLowerCase();
        }
        return getTickUnit().valueToString(val);
    }

    /**
     * Converts the given value to a tick label string.
     * @param val the value to convert.
     *
     * @return The tick label string.
     */
    protected String makeTickLabel(double val) {
        return makeTickLabel(val, false);
    }
    
    //// DEPRECATED CODE //////////////////////////////////////////////////////////////////////////
    
    /**
     * Converts a data value to a coordinate in Java2D space, assuming that
     * the axis runs along one edge of the specified plotArea.
     * Note that it is possible for the coordinate to fall outside the
     * plotArea.
     *
     * @param value  the data value.
     * @param plotArea  the area for plotting the data.
     * @param edge  the axis location.
     *
     * @return the Java2D coordinate.
     * 
     * @deprecated Use valueToJava2D().
     */
    public double translateValueToJava2D(double value, Rectangle2D plotArea,
                                         RectangleEdge edge) {

        Range range = getRange();
        double axisMin = switchedLog10(range.getLowerBound());
        double axisMax = switchedLog10(range.getUpperBound());

        double min = 0.0;
        double max = 0.0;
        if (RectangleEdge.isTopOrBottom(edge)) {
            min = plotArea.getMinX();
            max = plotArea.getMaxX();
        }
        else if (RectangleEdge.isLeftOrRight(edge)) {
            min = plotArea.getMaxY();
            max = plotArea.getMinY();
        }

        value = switchedLog10(value);

        if (isInverted()) {
            return max - (((value - axisMin) / (axisMax - axisMin)) * (max - min));
        }
        else {
            return min + (((value - axisMin) / (axisMax - axisMin)) * (max - min));
        }

    }

    /**
     * Converts a coordinate in Java2D space to the corresponding data
     * value, assuming that the axis runs along one edge of the specified plotArea.
     *
     * @param java2DValue  the coordinate in Java2D space.
     * @param plotArea  the area in which the data is plotted.
     * @param edge  the axis location.
     *
     * @return the data value.
     * 
     * @deprecated Use java2DToValue().
     */
    public double translateJava2DToValue(double java2DValue, Rectangle2D plotArea,
                                         RectangleEdge edge) {

        Range range = getRange();
        double axisMin = switchedLog10(range.getLowerBound());
        double axisMax = switchedLog10(range.getUpperBound());

        double plotMin = 0.0;
        double plotMax = 0.0;
        if (RectangleEdge.isTopOrBottom(edge)) {
            plotMin = plotArea.getX();
            plotMax = plotArea.getMaxX();
        }
        else if (RectangleEdge.isLeftOrRight(edge)) {
            plotMin = plotArea.getMaxY();
            plotMax = plotArea.getMinY();
        }

        if (isInverted()) {
            return Math.pow(
                10, axisMax - ((java2DValue - plotMin) / (plotMax - plotMin)) * (axisMax - axisMin)
            );
        }
        else {
            return Math.pow(
                10, axisMin + ((java2DValue - plotMin) / (plotMax - plotMin)) * (axisMax - axisMin)
            );
        }
    }
    
}