logarithmicaxis.html

jfreechart1。0。2的api。

<FONT color="green">542</FONT>                    upper = (upper + lower + minRange) / 2;<a name="line.542"></a>
<FONT color="green">543</FONT>                    lower = (upper + lower - minRange) / 2;<a name="line.543"></a>
<FONT color="green">544</FONT>                    //if autorange still below minimum then adjust by 1%<a name="line.544"></a>
<FONT color="green">545</FONT>                    // (can be needed when minRange is very small):<a name="line.545"></a>
<FONT color="green">546</FONT>                    if (upper - lower &lt; minRange) {<a name="line.546"></a>
<FONT color="green">547</FONT>                        double absUpper = Math.abs(upper);<a name="line.547"></a>
<FONT color="green">548</FONT>                        //need to account for case where upper==0.0<a name="line.548"></a>
<FONT color="green">549</FONT>                        double adjVal = (absUpper &gt; SMALL_LOG_VALUE) ? absUpper<a name="line.549"></a>
<FONT color="green">550</FONT>                            / 100.0 : 0.01;<a name="line.550"></a>
<FONT color="green">551</FONT>                        upper = (upper + lower + adjVal) / 2;<a name="line.551"></a>
<FONT color="green">552</FONT>                        lower = (upper + lower - adjVal) / 2;<a name="line.552"></a>
<FONT color="green">553</FONT>                    }<a name="line.553"></a>
<FONT color="green">554</FONT>                }<a name="line.554"></a>
<FONT color="green">555</FONT>    <a name="line.555"></a>
<FONT color="green">556</FONT>                setRange(new Range(lower, upper), false, false);<a name="line.556"></a>
<FONT color="green">557</FONT>                setupSmallLogFlag();       //setup flag based on bounds values<a name="line.557"></a>
<FONT color="green">558</FONT>            }<a name="line.558"></a>
<FONT color="green">559</FONT>        }<a name="line.559"></a>
<FONT color="green">560</FONT>    <a name="line.560"></a>
<FONT color="green">561</FONT>        /**<a name="line.561"></a>
<FONT color="green">562</FONT>         * Converts a data value to a coordinate in Java2D space, assuming that<a name="line.562"></a>
<FONT color="green">563</FONT>         * the axis runs along one edge of the specified plotArea.<a name="line.563"></a>
<FONT color="green">564</FONT>         * Note that it is possible for the coordinate to fall outside the<a name="line.564"></a>
<FONT color="green">565</FONT>         * plotArea.<a name="line.565"></a>
<FONT color="green">566</FONT>         *<a name="line.566"></a>
<FONT color="green">567</FONT>         * @param value  the data value.<a name="line.567"></a>
<FONT color="green">568</FONT>         * @param plotArea  the area for plotting the data.<a name="line.568"></a>
<FONT color="green">569</FONT>         * @param edge  the axis location.<a name="line.569"></a>
<FONT color="green">570</FONT>         *<a name="line.570"></a>
<FONT color="green">571</FONT>         * @return The Java2D coordinate.<a name="line.571"></a>
<FONT color="green">572</FONT>         */<a name="line.572"></a>
<FONT color="green">573</FONT>        public double valueToJava2D(double value, Rectangle2D plotArea,<a name="line.573"></a>
<FONT color="green">574</FONT>                                    RectangleEdge edge) {<a name="line.574"></a>
<FONT color="green">575</FONT>    <a name="line.575"></a>
<FONT color="green">576</FONT>            Range range = getRange();<a name="line.576"></a>
<FONT color="green">577</FONT>            double axisMin = switchedLog10(range.getLowerBound());<a name="line.577"></a>
<FONT color="green">578</FONT>            double axisMax = switchedLog10(range.getUpperBound());<a name="line.578"></a>
<FONT color="green">579</FONT>    <a name="line.579"></a>
<FONT color="green">580</FONT>            double min = 0.0;<a name="line.580"></a>
<FONT color="green">581</FONT>            double max = 0.0;<a name="line.581"></a>
<FONT color="green">582</FONT>            if (RectangleEdge.isTopOrBottom(edge)) {<a name="line.582"></a>
<FONT color="green">583</FONT>                min = plotArea.getMinX();<a name="line.583"></a>
<FONT color="green">584</FONT>                max = plotArea.getMaxX();<a name="line.584"></a>
<FONT color="green">585</FONT>            }<a name="line.585"></a>
<FONT color="green">586</FONT>            else if (RectangleEdge.isLeftOrRight(edge)) {<a name="line.586"></a>
<FONT color="green">587</FONT>                min = plotArea.getMaxY();<a name="line.587"></a>
<FONT color="green">588</FONT>                max = plotArea.getMinY();<a name="line.588"></a>
<FONT color="green">589</FONT>            }<a name="line.589"></a>
<FONT color="green">590</FONT>    <a name="line.590"></a>
<FONT color="green">591</FONT>            value = switchedLog10(value);<a name="line.591"></a>
<FONT color="green">592</FONT>    <a name="line.592"></a>
<FONT color="green">593</FONT>            if (isInverted()) {<a name="line.593"></a>
<FONT color="green">594</FONT>                return max<a name="line.594"></a>
<FONT color="green">595</FONT>                    - (((value - axisMin) / (axisMax - axisMin)) * (max - min));<a name="line.595"></a>
<FONT color="green">596</FONT>            }<a name="line.596"></a>
<FONT color="green">597</FONT>            else {<a name="line.597"></a>
<FONT color="green">598</FONT>                return min<a name="line.598"></a>
<FONT color="green">599</FONT>                    + (((value - axisMin) / (axisMax - axisMin)) * (max - min));<a name="line.599"></a>
<FONT color="green">600</FONT>            }<a name="line.600"></a>
<FONT color="green">601</FONT>    <a name="line.601"></a>
<FONT color="green">602</FONT>        }<a name="line.602"></a>
<FONT color="green">603</FONT>    <a name="line.603"></a>
<FONT color="green">604</FONT>        /**<a name="line.604"></a>
<FONT color="green">605</FONT>         * Converts a coordinate in Java2D space to the corresponding data<a name="line.605"></a>
<FONT color="green">606</FONT>         * value, assuming that the axis runs along one edge of the specified<a name="line.606"></a>
<FONT color="green">607</FONT>         * plotArea.<a name="line.607"></a>
<FONT color="green">608</FONT>         *<a name="line.608"></a>
<FONT color="green">609</FONT>         * @param java2DValue  the coordinate in Java2D space.<a name="line.609"></a>
<FONT color="green">610</FONT>         * @param plotArea  the area in which the data is plotted.<a name="line.610"></a>
<FONT color="green">611</FONT>         * @param edge  the axis location.<a name="line.611"></a>
<FONT color="green">612</FONT>         *<a name="line.612"></a>
<FONT color="green">613</FONT>         * @return The data value.<a name="line.613"></a>
<FONT color="green">614</FONT>         */<a name="line.614"></a>
<FONT color="green">615</FONT>        public double java2DToValue(double java2DValue, Rectangle2D plotArea,<a name="line.615"></a>
<FONT color="green">616</FONT>                                    RectangleEdge edge) {<a name="line.616"></a>
<FONT color="green">617</FONT>    <a name="line.617"></a>
<FONT color="green">618</FONT>            Range range = getRange();<a name="line.618"></a>
<FONT color="green">619</FONT>            double axisMin = switchedLog10(range.getLowerBound());<a name="line.619"></a>
<FONT color="green">620</FONT>            double axisMax = switchedLog10(range.getUpperBound());<a name="line.620"></a>
<FONT color="green">621</FONT>    <a name="line.621"></a>
<FONT color="green">622</FONT>            double plotMin = 0.0;<a name="line.622"></a>
<FONT color="green">623</FONT>            double plotMax = 0.0;<a name="line.623"></a>
<FONT color="green">624</FONT>            if (RectangleEdge.isTopOrBottom(edge)) {<a name="line.624"></a>
<FONT color="green">625</FONT>                plotMin = plotArea.getX();<a name="line.625"></a>
<FONT color="green">626</FONT>                plotMax = plotArea.getMaxX();<a name="line.626"></a>
<FONT color="green">627</FONT>            }<a name="line.627"></a>
<FONT color="green">628</FONT>            else if (RectangleEdge.isLeftOrRight(edge)) {<a name="line.628"></a>
<FONT color="green">629</FONT>                plotMin = plotArea.getMaxY();<a name="line.629"></a>
<FONT color="green">630</FONT>                plotMax = plotArea.getMinY();<a name="line.630"></a>
<FONT color="green">631</FONT>            }<a name="line.631"></a>
<FONT color="green">632</FONT>    <a name="line.632"></a>
<FONT color="green">633</FONT>            if (isInverted()) {<a name="line.633"></a>
<FONT color="green">634</FONT>                return Math.pow(<a name="line.634"></a>
<FONT color="green">635</FONT>                    10, axisMax - ((java2DValue - plotMin) / (plotMax - plotMin))<a name="line.635"></a>
<FONT color="green">636</FONT>                    * (axisMax - axisMin)<a name="line.636"></a>
<FONT color="green">637</FONT>                );<a name="line.637"></a>
<FONT color="green">638</FONT>            }<a name="line.638"></a>
<FONT color="green">639</FONT>            else {<a name="line.639"></a>
<FONT color="green">640</FONT>                return Math.pow(<a name="line.640"></a>
<FONT color="green">641</FONT>                    10, axisMin + ((java2DValue - plotMin) / (plotMax - plotMin))<a name="line.641"></a>
<FONT color="green">642</FONT>                    * (axisMax - axisMin)<a name="line.642"></a>
<FONT color="green">643</FONT>                );<a name="line.643"></a>
<FONT color="green">644</FONT>            }<a name="line.644"></a>
<FONT color="green">645</FONT>        }<a name="line.645"></a>
<FONT color="green">646</FONT>    <a name="line.646"></a>
<FONT color="green">647</FONT>        /**<a name="line.647"></a>
<FONT color="green">648</FONT>         * Calculates the positions of the tick labels for the axis, storing the<a name="line.648"></a>
<FONT color="green">649</FONT>         * results in the tick label list (ready for drawing).<a name="line.649"></a>
<FONT color="green">650</FONT>         *<a name="line.650"></a>
<FONT color="green">651</FONT>         * @param g2  the graphics device.<a name="line.651"></a>
<FONT color="green">652</FONT>         * @param dataArea  the area in which the plot should be drawn.<a name="line.652"></a>
<FONT color="green">653</FONT>         * @param edge  the location of the axis.<a name="line.653"></a>
<FONT color="green">654</FONT>         *<a name="line.654"></a>
<FONT color="green">655</FONT>         * @return A list of ticks.<a name="line.655"></a>
<FONT color="green">656</FONT>         */<a name="line.656"></a>
<FONT color="green">657</FONT>        protected List refreshTicksHorizontal(Graphics2D g2,<a name="line.657"></a>
<FONT color="green">658</FONT>                                              Rectangle2D dataArea,<a name="line.658"></a>
<FONT color="green">659</FONT>                                              RectangleEdge edge) {<a name="line.659"></a>
<FONT color="green">660</FONT>    <a name="line.660"></a>
<FONT color="green">661</FONT>            List ticks = new java.util.ArrayList();<a name="line.661"></a>
<FONT color="green">662</FONT>            Range range = getRange();<a name="line.662"></a>
<FONT color="green">663</FONT>    <a name="line.663"></a>
<FONT color="green">664</FONT>            //get lower bound value:<a name="line.664"></a>
<FONT color="green">665</FONT>            double lowerBoundVal = range.getLowerBound();<a name="line.665"></a>
<FONT color="green">666</FONT>                  //if small log values and lower bound value too small<a name="line.666"></a>
<FONT color="green">667</FONT>                  // then set to a small value (don't allow &lt;= 0):<a name="line.667"></a>
<FONT color="green">668</FONT>            if (this.smallLogFlag &amp;&amp; lowerBoundVal &lt; SMALL_LOG_VALUE) {<a name="line.668"></a>
<FONT color="green">669</FONT>                lowerBoundVal = SMALL_LOG_VALUE;<a name="line.669"></a>
<FONT color="green">670</FONT>            }<a name="line.670"></a>
<FONT color="green">671</FONT>    <a name="line.671"></a>
<FONT color="green">672</FONT>            //get upper bound value<a name="line.672"></a>
<FONT color="green">673</FONT>            double upperBoundVal = range.getUpperBound();<a name="line.673"></a>
<FONT color="green">674</FONT>    <a name="line.674"></a>
<FONT color="green">675</FONT>            //get log10 version of lower bound and round to integer:<a name="line.675"></a>
<FONT color="green">676</FONT>            int iBegCount = (int) Math.rint(switchedLog10(lowerBoundVal));<a name="line.676"></a>
<FONT color="green">677</FONT>            //get log10