xydifferencerenderer.html

jfreechart1。0。2的api。

<FONT color="green">272</FONT>         * Returns &lt;code&gt;2&lt;/code&gt;, the number of passes required by the renderer.  <a name="line.272"></a>
<FONT color="green">273</FONT>         * The {@link XYPlot} will run through the dataset this number of times.<a name="line.273"></a>
<FONT color="green">274</FONT>         * <a name="line.274"></a>
<FONT color="green">275</FONT>         * @return The number of passes required by the renderer.<a name="line.275"></a>
<FONT color="green">276</FONT>         */<a name="line.276"></a>
<FONT color="green">277</FONT>        public int getPassCount() {<a name="line.277"></a>
<FONT color="green">278</FONT>            return 2;<a name="line.278"></a>
<FONT color="green">279</FONT>        }<a name="line.279"></a>
<FONT color="green">280</FONT>        <a name="line.280"></a>
<FONT color="green">281</FONT>        /**<a name="line.281"></a>
<FONT color="green">282</FONT>         * Draws the visual representation of a single data item.<a name="line.282"></a>
<FONT color="green">283</FONT>         *<a name="line.283"></a>
<FONT color="green">284</FONT>         * @param g2  the graphics device.<a name="line.284"></a>
<FONT color="green">285</FONT>         * @param state  the renderer state.<a name="line.285"></a>
<FONT color="green">286</FONT>         * @param dataArea  the area within which the data is being drawn.<a name="line.286"></a>
<FONT color="green">287</FONT>         * @param info  collects information about the drawing.<a name="line.287"></a>
<FONT color="green">288</FONT>         * @param plot  the plot (can be used to obtain standard color <a name="line.288"></a>
<FONT color="green">289</FONT>         *              information etc).<a name="line.289"></a>
<FONT color="green">290</FONT>         * @param domainAxis  the domain (horizontal) axis.<a name="line.290"></a>
<FONT color="green">291</FONT>         * @param rangeAxis  the range (vertical) axis.<a name="line.291"></a>
<FONT color="green">292</FONT>         * @param dataset  the dataset.<a name="line.292"></a>
<FONT color="green">293</FONT>         * @param series  the series index (zero-based).<a name="line.293"></a>
<FONT color="green">294</FONT>         * @param item  the item index (zero-based).<a name="line.294"></a>
<FONT color="green">295</FONT>         * @param crosshairState  crosshair information for the plot <a name="line.295"></a>
<FONT color="green">296</FONT>         *                        (&lt;code&gt;null&lt;/code&gt; permitted).<a name="line.296"></a>
<FONT color="green">297</FONT>         * @param pass  the pass index.<a name="line.297"></a>
<FONT color="green">298</FONT>         */<a name="line.298"></a>
<FONT color="green">299</FONT>        public void drawItem(Graphics2D g2,<a name="line.299"></a>
<FONT color="green">300</FONT>                             XYItemRendererState state,<a name="line.300"></a>
<FONT color="green">301</FONT>                             Rectangle2D dataArea,<a name="line.301"></a>
<FONT color="green">302</FONT>                             PlotRenderingInfo info,<a name="line.302"></a>
<FONT color="green">303</FONT>                             XYPlot plot,<a name="line.303"></a>
<FONT color="green">304</FONT>                             ValueAxis domainAxis,<a name="line.304"></a>
<FONT color="green">305</FONT>                             ValueAxis rangeAxis,<a name="line.305"></a>
<FONT color="green">306</FONT>                             XYDataset dataset,<a name="line.306"></a>
<FONT color="green">307</FONT>                             int series,<a name="line.307"></a>
<FONT color="green">308</FONT>                             int item,<a name="line.308"></a>
<FONT color="green">309</FONT>                             CrosshairState crosshairState,<a name="line.309"></a>
<FONT color="green">310</FONT>                             int pass) {<a name="line.310"></a>
<FONT color="green">311</FONT>    <a name="line.311"></a>
<FONT color="green">312</FONT>            if (pass == 0) {<a name="line.312"></a>
<FONT color="green">313</FONT>                drawItemPass0(g2, dataArea, info, plot, domainAxis, rangeAxis, <a name="line.313"></a>
<FONT color="green">314</FONT>                        dataset, series, item, crosshairState);<a name="line.314"></a>
<FONT color="green">315</FONT>            }<a name="line.315"></a>
<FONT color="green">316</FONT>            else if (pass == 1) {<a name="line.316"></a>
<FONT color="green">317</FONT>                drawItemPass1(g2, dataArea, info, plot, domainAxis, rangeAxis, <a name="line.317"></a>
<FONT color="green">318</FONT>                        dataset, series, item, crosshairState);<a name="line.318"></a>
<FONT color="green">319</FONT>            }<a name="line.319"></a>
<FONT color="green">320</FONT>    <a name="line.320"></a>
<FONT color="green">321</FONT>        }<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>         * Draws the visual representation of a single data item, first pass.<a name="line.324"></a>
<FONT color="green">325</FONT>         *<a name="line.325"></a>
<FONT color="green">326</FONT>         * @param g2  the graphics device.<a name="line.326"></a>
<FONT color="green">327</FONT>         * @param dataArea  the area within which the data is being drawn.<a name="line.327"></a>
<FONT color="green">328</FONT>         * @param info  collects information about the drawing.<a name="line.328"></a>
<FONT color="green">329</FONT>         * @param plot  the plot (can be used to obtain standard color <a name="line.329"></a>
<FONT color="green">330</FONT>         *              information etc).<a name="line.330"></a>
<FONT color="green">331</FONT>         * @param domainAxis  the domain (horizontal) axis.<a name="line.331"></a>
<FONT color="green">332</FONT>         * @param rangeAxis  the range (vertical) axis.<a name="line.332"></a>
<FONT color="green">333</FONT>         * @param dataset  the dataset.<a name="line.333"></a>
<FONT color="green">334</FONT>         * @param series  the series index (zero-based).<a name="line.334"></a>
<FONT color="green">335</FONT>         * @param item  the item index (zero-based).<a name="line.335"></a>
<FONT color="green">336</FONT>         * @param crosshairState  crosshair information for the plot <a name="line.336"></a>
<FONT color="green">337</FONT>         *                        (&lt;code&gt;null&lt;/code&gt; permitted).<a name="line.337"></a>
<FONT color="green">338</FONT>         */<a name="line.338"></a>
<FONT color="green">339</FONT>        protected void drawItemPass0(Graphics2D g2,<a name="line.339"></a>
<FONT color="green">340</FONT>                                     Rectangle2D dataArea,<a name="line.340"></a>
<FONT color="green">341</FONT>                                     PlotRenderingInfo info,<a name="line.341"></a>
<FONT color="green">342</FONT>                                     XYPlot plot,<a name="line.342"></a>
<FONT color="green">343</FONT>                                     ValueAxis domainAxis,<a name="line.343"></a>
<FONT color="green">344</FONT>                                     ValueAxis rangeAxis,<a name="line.344"></a>
<FONT color="green">345</FONT>                                     XYDataset dataset,<a name="line.345"></a>
<FONT color="green">346</FONT>                                     int series,<a name="line.346"></a>
<FONT color="green">347</FONT>                                     int item,<a name="line.347"></a>
<FONT color="green">348</FONT>                                     CrosshairState crosshairState) {<a name="line.348"></a>
<FONT color="green">349</FONT>    <a name="line.349"></a>
<FONT color="green">350</FONT>            if (series == 0) {<a name="line.350"></a>
<FONT color="green">351</FONT>    <a name="line.351"></a>
<FONT color="green">352</FONT>                PlotOrientation orientation = plot.getOrientation();<a name="line.352"></a>
<FONT color="green">353</FONT>                RectangleEdge domainAxisLocation = plot.getDomainAxisEdge();<a name="line.353"></a>
<FONT color="green">354</FONT>                RectangleEdge rangeAxisLocation = plot.getRangeAxisEdge();<a name="line.354"></a>
<FONT color="green">355</FONT>                <a name="line.355"></a>
<FONT color="green">356</FONT>                double y0 = dataset.getYValue(0, item);<a name="line.356"></a>
<FONT color="green">357</FONT>                double x1 = dataset.getXValue(1, item);<a name="line.357"></a>
<FONT color="green">358</FONT>                double y1 = dataset.getYValue(1, item);<a name="line.358"></a>
<FONT color="green">359</FONT>    <a name="line.359"></a>
<FONT color="green">360</FONT>                double transY0 = rangeAxis.valueToJava2D(y0, dataArea, <a name="line.360"></a>
<FONT color="green">361</FONT>                        rangeAxisLocation);<a name="line.361"></a>
<FONT color="green">362</FONT>                double transX1 = domainAxis.valueToJava2D(x1, dataArea, <a name="line.362"></a>
<FONT color="green">363</FONT>                        domainAxisLocation);<a name="line.363"></a>
<FONT color="green">364</FONT>                double transY1 = rangeAxis.valueToJava2D(y1, dataArea, <a name="line.364"></a>
<FONT color="green">365</FONT>                        rangeAxisLocation);<a name="line.365"></a>
<FONT color="green">366</FONT>    <a name="line.366"></a>
<FONT color="green">367</FONT>                if (item &gt; 0) {<a name="line.367"></a>
<FONT color="green">368</FONT>                    double prevx0 = dataset.getXValue(0, item - 1);<a name="line.368"></a>
<FONT color="green">369</FONT>                    double prevy0 = dataset.getYValue(0, item - 1);<a name="line.369"></a>
<FONT color="green">370</FONT>                    double prevy1 = dataset.getYValue(1, item - 1);<a name="line.370"></a>
<FONT color="green">371</FONT>    <a name="line.371"></a>
<FONT color="green">372</FONT>                    double prevtransX0 = domainAxis.valueToJava2D(prevx0, dataArea, <a name="line.372"></a>
<FONT color="green">373</FONT>                            domainAxisLocation);<a name="line.373"></a>
<FONT color="green">374</FONT>                    double prevtransY0 = rangeAxis.valueToJava2D(prevy0, dataArea, <a name="line.374"></a>
<FONT color="green">375</FONT>                            rangeAxisLocation);<a name="line.375"></a>
<FONT color="green">376</FONT>                    double prevtransY1 = rangeAxis.valueToJava2D(prevy1, dataArea, <a name="line.376"></a>
<FONT color="green">377</FONT>                            rangeAxisLocation);<a name="line.377"></a>
<FONT color="green">378</FONT>    <a name="line.378"></a>
<FONT color="green">379</FONT>                    Shape positive = getPositiveArea((float) prevtransX0, <a name="line.379"></a>
<FONT color="green">380</FONT>                            (float) prevtransY0, (float) prevtransY1,<a name="line.380"></a>
<FONT color="green">381</FONT>                            (float) transX1, (float) transY0, (float) transY1,<a name="line.381"></a>
<FONT color="green">382</FONT>                            orientation);<a name="line.382"></a>
<FONT color="green">383</FONT>                    if (positive != null) {<a name="line.383"></a>
<FONT color="green">384</FONT>                        g2.setPaint(getPositivePaint());<a name="line.384"></a>
<FONT color="green">385</FONT>                        g2.fill(positive);<a name="line.385"></a>
<FONT color="green">386</FONT>                    }<a name="line.386"></a>
<FONT color="green">387</FONT>    <a name="line.387"></a>
<FONT color="green">388</FONT>                    Shape negative = getNegativeArea((float) prevtransX0, <a name="line.388"></a>
<FONT color="green">389</FONT>                            (float) prevtransY0, (float) prevtransY1,<a name="line.389"></a>
<FONT color="green">390</FONT>                            (float) transX1, (float) transY0, (float) transY1,<a name="line.390"></a>
<FONT color="green">391</FONT>                            orientation);<a name="line.391"></a>
<FONT color="green">392</FONT>    <a name="line.392"></a>
<FONT color="green">393</FONT>                    if (negative != null) {<a name="line.393"></a>
<FONT color="green">394</FONT>                        g2.setPaint(getNegativePaint());<a name="line.394"></a>
<FONT color="green">395</FONT>                        g2.fill(negative);<a name="line.395"></a>
<FONT color="green">396</FONT>                    }<a name="line.396"></a>
<FONT color="green">397</FONT>                }<a name="line.397"></a>
<FONT color="green">398</FONT>            }<a name="line.398"></a>
<FONT color="green">399</FONT>    <a name="line.399"></a>
<FONT color="green">400</FONT>        }<a name="line.400"></a>
<FONT color="green">401</FONT>    <a name="line.401"></a>
<FONT color="green">402</FONT>        /**<a name="line.402"></a>
<FONT color="green">403</FONT>         * Draws the visual representation of a single data item, second pass.  In <a name="line.403"></a>
<FONT color="green">404</FONT>         * the second pass, the renderer draws the lines and shapes for the <a name="line.404"></a>
<FONT color="green">405</FONT>         * individual points in the two series.<a name="line.405"></a>
<FONT color="green">406</FONT>         *<a name="line.406"></a>
<FONT color="green">407</FONT>         * @param g2  the graphics device.<a name="line.407"></a>
<FONT color="green">408</FONT>         * @param dataArea  the area within which the data is being drawn.<a name="line.408"></a>