stackedxyarearenderer.html

jfreechart1。0。2的api。

<FONT color="green">292</FONT>         * item is rendered, giving the renderer an opportunity to initialise any <a name="line.292"></a>
<FONT color="green">293</FONT>         * state information it wants to maintain.<a name="line.293"></a>
<FONT color="green">294</FONT>         *<a name="line.294"></a>
<FONT color="green">295</FONT>         * @param g2  the graphics device.<a name="line.295"></a>
<FONT color="green">296</FONT>         * @param dataArea  the area inside the axes.<a name="line.296"></a>
<FONT color="green">297</FONT>         * @param plot  the plot.<a name="line.297"></a>
<FONT color="green">298</FONT>         * @param data  the data.<a name="line.298"></a>
<FONT color="green">299</FONT>         * @param info  an optional info collection object to return data back to <a name="line.299"></a>
<FONT color="green">300</FONT>         *              the caller.<a name="line.300"></a>
<FONT color="green">301</FONT>         *<a name="line.301"></a>
<FONT color="green">302</FONT>         * @return A state object that should be passed to subsequent calls to the <a name="line.302"></a>
<FONT color="green">303</FONT>         *         drawItem() method.<a name="line.303"></a>
<FONT color="green">304</FONT>         */<a name="line.304"></a>
<FONT color="green">305</FONT>        public XYItemRendererState initialise(Graphics2D g2,<a name="line.305"></a>
<FONT color="green">306</FONT>                                              Rectangle2D dataArea,<a name="line.306"></a>
<FONT color="green">307</FONT>                                              XYPlot plot,<a name="line.307"></a>
<FONT color="green">308</FONT>                                              XYDataset data,<a name="line.308"></a>
<FONT color="green">309</FONT>                                              PlotRenderingInfo info) {<a name="line.309"></a>
<FONT color="green">310</FONT>    <a name="line.310"></a>
<FONT color="green">311</FONT>            return new StackedXYAreaRendererState(info);<a name="line.311"></a>
<FONT color="green">312</FONT>    <a name="line.312"></a>
<FONT color="green">313</FONT>        }<a name="line.313"></a>
<FONT color="green">314</FONT>    <a name="line.314"></a>
<FONT color="green">315</FONT>        /**<a name="line.315"></a>
<FONT color="green">316</FONT>         * Returns the number of passes required by the renderer.<a name="line.316"></a>
<FONT color="green">317</FONT>         * <a name="line.317"></a>
<FONT color="green">318</FONT>         * @return 2.<a name="line.318"></a>
<FONT color="green">319</FONT>         */<a name="line.319"></a>
<FONT color="green">320</FONT>        public int getPassCount() {<a name="line.320"></a>
<FONT color="green">321</FONT>            return 2;<a name="line.321"></a>
<FONT color="green">322</FONT>        }<a name="line.322"></a>
<FONT color="green">323</FONT>    <a name="line.323"></a>
<FONT color="green">324</FONT>        /**<a name="line.324"></a>
<FONT color="green">325</FONT>         * Returns the range of values the renderer requires to display all the <a name="line.325"></a>
<FONT color="green">326</FONT>         * items from the specified dataset.<a name="line.326"></a>
<FONT color="green">327</FONT>         * <a name="line.327"></a>
<FONT color="green">328</FONT>         * @param dataset  the dataset (&lt;code&gt;null&lt;/code&gt; permitted).<a name="line.328"></a>
<FONT color="green">329</FONT>         * <a name="line.329"></a>
<FONT color="green">330</FONT>         * @return The range ([0.0, 0.0] if the dataset contains no values, and <a name="line.330"></a>
<FONT color="green">331</FONT>         *         &lt;code&gt;null&lt;/code&gt; if the dataset is &lt;code&gt;null&lt;/code&gt;).<a name="line.331"></a>
<FONT color="green">332</FONT>         *         <a name="line.332"></a>
<FONT color="green">333</FONT>         * @throws ClassCastException if &lt;code&gt;dataset&lt;/code&gt; is not an instance<a name="line.333"></a>
<FONT color="green">334</FONT>         *         of {@link TableXYDataset}.<a name="line.334"></a>
<FONT color="green">335</FONT>         */<a name="line.335"></a>
<FONT color="green">336</FONT>        public Range findRangeBounds(XYDataset dataset) {<a name="line.336"></a>
<FONT color="green">337</FONT>            if (dataset != null) {<a name="line.337"></a>
<FONT color="green">338</FONT>                return DatasetUtilities.findStackedRangeBounds(<a name="line.338"></a>
<FONT color="green">339</FONT>                    (TableXYDataset) dataset);<a name="line.339"></a>
<FONT color="green">340</FONT>            }<a name="line.340"></a>
<FONT color="green">341</FONT>            else {<a name="line.341"></a>
<FONT color="green">342</FONT>                return null;<a name="line.342"></a>
<FONT color="green">343</FONT>            }<a name="line.343"></a>
<FONT color="green">344</FONT>        }<a name="line.344"></a>
<FONT color="green">345</FONT>    <a name="line.345"></a>
<FONT color="green">346</FONT>        /**<a name="line.346"></a>
<FONT color="green">347</FONT>         * Draws the visual representation of a single data item.<a name="line.347"></a>
<FONT color="green">348</FONT>         *<a name="line.348"></a>
<FONT color="green">349</FONT>         * @param g2  the graphics device.<a name="line.349"></a>
<FONT color="green">350</FONT>         * @param state  the renderer state.<a name="line.350"></a>
<FONT color="green">351</FONT>         * @param dataArea  the area within which the data is being drawn.<a name="line.351"></a>
<FONT color="green">352</FONT>         * @param info  collects information about the drawing.<a name="line.352"></a>
<FONT color="green">353</FONT>         * @param plot  the plot (can be used to obtain standard color information <a name="line.353"></a>
<FONT color="green">354</FONT>         *              etc).<a name="line.354"></a>
<FONT color="green">355</FONT>         * @param domainAxis  the domain axis.<a name="line.355"></a>
<FONT color="green">356</FONT>         * @param rangeAxis  the range axis.<a name="line.356"></a>
<FONT color="green">357</FONT>         * @param dataset  the dataset.<a name="line.357"></a>
<FONT color="green">358</FONT>         * @param series  the series index (zero-based).<a name="line.358"></a>
<FONT color="green">359</FONT>         * @param item  the item index (zero-based).<a name="line.359"></a>
<FONT color="green">360</FONT>         * @param crosshairState  information about crosshairs on a plot.<a name="line.360"></a>
<FONT color="green">361</FONT>         * @param pass  the pass index.<a name="line.361"></a>
<FONT color="green">362</FONT>         * <a name="line.362"></a>
<FONT color="green">363</FONT>         * @throws ClassCastException if &lt;code&gt;state&lt;/code&gt; is not an instance of<a name="line.363"></a>
<FONT color="green">364</FONT>         *         &lt;code&gt;StackedXYAreaRendererState&lt;/code&gt; or &lt;code&gt;dataset&lt;/code&gt;<a name="line.364"></a>
<FONT color="green">365</FONT>         *         is not an instance of {@link TableXYDataset}.<a name="line.365"></a>
<FONT color="green">366</FONT>         */<a name="line.366"></a>
<FONT color="green">367</FONT>        public void drawItem(Graphics2D g2,<a name="line.367"></a>
<FONT color="green">368</FONT>                             XYItemRendererState state,<a name="line.368"></a>
<FONT color="green">369</FONT>                             Rectangle2D dataArea,<a name="line.369"></a>
<FONT color="green">370</FONT>                             PlotRenderingInfo info,<a name="line.370"></a>
<FONT color="green">371</FONT>                             XYPlot plot,<a name="line.371"></a>
<FONT color="green">372</FONT>                             ValueAxis domainAxis,<a name="line.372"></a>
<FONT color="green">373</FONT>                             ValueAxis rangeAxis,<a name="line.373"></a>
<FONT color="green">374</FONT>                             XYDataset dataset,<a name="line.374"></a>
<FONT color="green">375</FONT>                             int series,<a name="line.375"></a>
<FONT color="green">376</FONT>                             int item,<a name="line.376"></a>
<FONT color="green">377</FONT>                             CrosshairState crosshairState,<a name="line.377"></a>
<FONT color="green">378</FONT>                             int pass) {<a name="line.378"></a>
<FONT color="green">379</FONT>    <a name="line.379"></a>
<FONT color="green">380</FONT>            PlotOrientation orientation = plot.getOrientation();<a name="line.380"></a>
<FONT color="green">381</FONT>            StackedXYAreaRendererState areaState <a name="line.381"></a>
<FONT color="green">382</FONT>                = (StackedXYAreaRendererState) state;<a name="line.382"></a>
<FONT color="green">383</FONT>            // Get the item count for the series, so that we can know which is the<a name="line.383"></a>
<FONT color="green">384</FONT>            // end of the series.<a name="line.384"></a>
<FONT color="green">385</FONT>            TableXYDataset tdataset = (TableXYDataset) dataset;<a name="line.385"></a>
<FONT color="green">386</FONT>            int itemCount = tdataset.getItemCount();<a name="line.386"></a>
<FONT color="green">387</FONT>    <a name="line.387"></a>
<FONT color="green">388</FONT>            // get the data point...<a name="line.388"></a>
<FONT color="green">389</FONT>            double x1 = dataset.getXValue(series, item);<a name="line.389"></a>
<FONT color="green">390</FONT>            double y1 = dataset.getYValue(series, item);<a name="line.390"></a>
<FONT color="green">391</FONT>            boolean nullPoint = false;<a name="line.391"></a>
<FONT color="green">392</FONT>            if (Double.isNaN(y1)) {<a name="line.392"></a>
<FONT color="green">393</FONT>                y1 = 0.0;<a name="line.393"></a>
<FONT color="green">394</FONT>                nullPoint = true;<a name="line.394"></a>
<FONT color="green">395</FONT>            }<a name="line.395"></a>
<FONT color="green">396</FONT>    <a name="line.396"></a>
<FONT color="green">397</FONT>            //  Get height adjustment based on stack and translate to Java2D values<a name="line.397"></a>
<FONT color="green">398</FONT>            double ph1 = getPreviousHeight(tdataset, series, item);<a name="line.398"></a>
<FONT color="green">399</FONT>            double transX1 = domainAxis.valueToJava2D(x1, dataArea, <a name="line.399"></a>
<FONT color="green">400</FONT>                    plot.getDomainAxisEdge());<a name="line.400"></a>
<FONT color="green">401</FONT>            double transY1 = rangeAxis.valueToJava2D(y1 + ph1, dataArea, <a name="line.401"></a>
<FONT color="green">402</FONT>                    plot.getRangeAxisEdge());<a name="line.402"></a>
<FONT color="green">403</FONT>    <a name="line.403"></a>
<FONT color="green">404</FONT>            //  Get series Paint and Stroke<a name="line.404"></a>
<FONT color="green">405</FONT>            Paint seriesPaint = getItemPaint(series, item);<a name="line.405"></a>
<FONT color="green">406</FONT>            Stroke seriesStroke = getItemStroke(series, item);<a name="line.406"></a>
<FONT color="green">407</FONT>    <a name="line.407"></a>
<FONT color="green">408</FONT>            if (pass == 0) {<a name="line.408"></a>
<FONT color="green">409</FONT>                //  On first pass render the areas, line and outlines<a name="line.409"></a>
<FONT color="green">410</FONT>    <a name="line.410"></a>
<FONT color="green">411</FONT>                if (item == 0) {<a name="line.411"></a>
<FONT color="green">412</FONT>                    // Create a new Area for the series<a name="line.412"></a>
<FONT color="green">413</FONT>                    areaState.setSeriesArea(new Polygon());<a name="line.413"></a>
<FONT color="green">414</FONT>                    areaState.setLastSeriesPoints(<a name="line.414"></a>
<FONT color="green">415</FONT>                            areaState.getCurrentSeriesPoints());<a name="line.415"></a>
<FONT color="green">416</FONT>                    areaState.setCurrentSeriesPoints(new Stack());<a name="line.416"></a>
<FONT color="green">417</FONT>    <a name="line.417"></a>
<FONT color="green">418</FONT>                    // start from previous height (ph1)<a name="line.418"></a>
<FONT color="green">419</FONT>                    double transY2 = rangeAxis.valueToJava2D(ph1, dataArea, <a name="line.419"></a>
<FONT color="green">420</FONT>                            plot.getRangeAxisEdge());<a name="line.420"></a>
<FONT color="green">421</FONT>    <a name="line.421"></a>
<FONT color="green">422</FONT>                    // The first point is (x, 0)<a name="line.422"></a>
<FONT color="green">423</FONT>                    if (orientation == PlotOrientation.VERTICAL) {<a name="line.423"></a>
<FONT color="green">424</FONT>                        areaState.getSeriesArea().addPoint((int) transX1, <a name="line.424"></a>
<FONT color="green">425</FONT>                                (int) transY2);<a name="line.425"></a>
<FONT color="green">426</FONT>                    } <a name="line.426"></a>
<FONT color="green">427</FONT>                    else if (orientation == PlotOrientation.HORIZONTAL) {<a name="line.427"></a>
<FONT color="green">428</FONT>                        areaState.getSeriesArea().addPoint((int) transY2, <a name="line.428"></a>
<FONT color="green">429</FONT>                                (int) transX1);<a name="line.429"></a>
<FONT color="green">430</FONT>                    }<a name="line.430"></a>
<FONT color="green">431</FONT>                }<a name="line.431"></a>
<FONT color="green">432</FONT>    <a name="line.432"></a>
<FONT color="green">433</FONT>                // Add each point to Area (x, y)<a name="line.433"></a>
<FONT color="green">434</FONT>                if (orientation == PlotOrientation.VERTICAL) {<a name="line.434"></a>
<FONT color="green">435</FONT>                    Point point = new Point((int) transX1, (int) transY1);<a name="line.435"></a>
<FONT color="green">436</FONT>                    areaState.getSeriesArea().addPoint((int) point.getX(), <a name="line.436"></a>
<FONT color="green">437</FONT>                            (int) point.getY());<a name="line.437"></a>
<FONT color="green">438</FONT>                    areaState.getCurrentSeriesPoints().push(point);<a name="line.438"></a>