📄 chartutilities.html
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<FONT color="green">270</FONT> );<a name="line.270"></a><FONT color="green">271</FONT> g2.setTransform(saved);<a name="line.271"></a><FONT color="green">272</FONT> g2.dispose();<a name="line.272"></a><FONT color="green">273</FONT> }<a name="line.273"></a><FONT color="green">274</FONT> else {<a name="line.274"></a><FONT color="green">275</FONT> chart.draw(<a name="line.275"></a><FONT color="green">276</FONT> g2, new Rectangle2D.Double(0, 0, defaultWidth, defaultHeight), <a name="line.276"></a><FONT color="green">277</FONT> null, null<a name="line.277"></a><FONT color="green">278</FONT> );<a name="line.278"></a><FONT color="green">279</FONT> }<a name="line.279"></a><FONT color="green">280</FONT> out.write(encodeAsPNG(image));<a name="line.280"></a><FONT color="green">281</FONT> <a name="line.281"></a><FONT color="green">282</FONT> }<a name="line.282"></a><FONT color="green">283</FONT> <a name="line.283"></a><FONT color="green">284</FONT> /**<a name="line.284"></a><FONT color="green">285</FONT> * Saves a chart to the specified file in PNG format.<a name="line.285"></a><FONT color="green">286</FONT> *<a name="line.286"></a><FONT color="green">287</FONT> * @param file the file name (<code>null</code> not permitted).<a name="line.287"></a><FONT color="green">288</FONT> * @param chart the chart (<code>null</code> not permitted).<a name="line.288"></a><FONT color="green">289</FONT> * @param width the image width.<a name="line.289"></a><FONT color="green">290</FONT> * @param height the image height.<a name="line.290"></a><FONT color="green">291</FONT> *<a name="line.291"></a><FONT color="green">292</FONT> * @throws IOException if there are any I/O errors.<a name="line.292"></a><FONT color="green">293</FONT> */<a name="line.293"></a><FONT color="green">294</FONT> public static void saveChartAsPNG(File file,<a name="line.294"></a><FONT color="green">295</FONT> JFreeChart chart,<a name="line.295"></a><FONT color="green">296</FONT> int width,<a name="line.296"></a><FONT color="green">297</FONT> int height) throws IOException {<a name="line.297"></a><FONT color="green">298</FONT> <a name="line.298"></a><FONT color="green">299</FONT> // defer argument checking...<a name="line.299"></a><FONT color="green">300</FONT> saveChartAsPNG(file, chart, width, height, null);<a name="line.300"></a><FONT color="green">301</FONT> <a name="line.301"></a><FONT color="green">302</FONT> }<a name="line.302"></a><FONT color="green">303</FONT> <a name="line.303"></a><FONT color="green">304</FONT> /**<a name="line.304"></a><FONT color="green">305</FONT> * Saves a chart to a file in PNG format. This method allows you to pass <a name="line.305"></a><FONT color="green">306</FONT> * in a {@link ChartRenderingInfo} object, to collect information about the <a name="line.306"></a><FONT color="green">307</FONT> * chart dimensions/entities. You will need this info if you want to <a name="line.307"></a><FONT color="green">308</FONT> * create an HTML image map.<a name="line.308"></a><FONT color="green">309</FONT> *<a name="line.309"></a><FONT color="green">310</FONT> * @param file the file (<code>null</code> not permitted).<a name="line.310"></a><FONT color="green">311</FONT> * @param chart the chart (<code>null</code> not permitted).<a name="line.311"></a><FONT color="green">312</FONT> * @param width the image width.<a name="line.312"></a><FONT color="green">313</FONT> * @param height the image height.<a name="line.313"></a><FONT color="green">314</FONT> * @param info the chart rendering info (<code>null</code> permitted).<a name="line.314"></a><FONT color="green">315</FONT> *<a name="line.315"></a><FONT color="green">316</FONT> * @throws IOException if there are any I/O errors.<a name="line.316"></a><FONT color="green">317</FONT> */<a name="line.317"></a><FONT color="green">318</FONT> public static void saveChartAsPNG(File file,<a name="line.318"></a><FONT color="green">319</FONT> JFreeChart chart,<a name="line.319"></a><FONT color="green">320</FONT> int width,<a name="line.320"></a><FONT color="green">321</FONT> int height,<a name="line.321"></a><FONT color="green">322</FONT> ChartRenderingInfo info) <a name="line.322"></a><FONT color="green">323</FONT> throws IOException {<a name="line.323"></a><FONT color="green">324</FONT> <a name="line.324"></a><FONT color="green">325</FONT> if (file == null) {<a name="line.325"></a><FONT color="green">326</FONT> throw new IllegalArgumentException("Null 'file' argument.");<a name="line.326"></a><FONT color="green">327</FONT> }<a name="line.327"></a><FONT color="green">328</FONT> OutputStream out = new BufferedOutputStream(new FileOutputStream(file));<a name="line.328"></a><FONT color="green">329</FONT> ChartUtilities.writeChartAsPNG(out, chart, width, height, info);<a name="line.329"></a><FONT color="green">330</FONT> out.close();<a name="line.330"></a><FONT color="green">331</FONT> }<a name="line.331"></a><FONT color="green">332</FONT> <a name="line.332"></a><FONT color="green">333</FONT> /**<a name="line.333"></a><FONT color="green">334</FONT> * Saves a chart to a file in PNG format. This method allows you to pass <a name="line.334"></a><FONT color="green">335</FONT> * in a {@link ChartRenderingInfo} object, to collect information about the <a name="line.335"></a><FONT color="green">336</FONT> * chart dimensions/entities. You will need this info if you want to <a name="line.336"></a><FONT color="green">337</FONT> * create an HTML image map.<a name="line.337"></a><FONT color="green">338</FONT> *<a name="line.338"></a><FONT color="green">339</FONT> * @param file the file (<code>null</code> not permitted).<a name="line.339"></a><FONT color="green">340</FONT> * @param chart the chart (<code>null</code> not permitted).<a name="line.340"></a><FONT color="green">341</FONT> * @param width the image width.<a name="line.341"></a><FONT color="green">342</FONT> * @param height the image height.<a name="line.342"></a><FONT color="green">343</FONT> * @param info the chart rendering info (<code>null</code> permitted).<a name="line.343"></a><FONT color="green">344</FONT> * @param encodeAlpha encode alpha?<a name="line.344"></a><FONT color="green">345</FONT> * @param compression the PNG compression level (0-9).<a name="line.345"></a><FONT color="green">346</FONT> *<a name="line.346"></a><FONT color="green">347</FONT> * @throws IOException if there are any I/O errors.<a name="line.347"></a><FONT color="green">348</FONT> */<a name="line.348"></a><FONT color="green">349</FONT> public static void saveChartAsPNG(File file,<a name="line.349"></a><FONT color="green">350</FONT> JFreeChart chart,<a name="line.350"></a><FONT color="green">351</FONT> int width,<a name="line.351"></a><FONT color="green">352</FONT> int height,<a name="line.352"></a><FONT color="green">353</FONT> ChartRenderingInfo info,<a name="line.353"></a><FONT color="green">354</FONT> boolean encodeAlpha,<a name="line.354"></a><FONT color="green">355</FONT> int compression) throws IOException {<a name="line.355"></a><FONT color="green">356</FONT> <a name="line.356"></a><FONT color="green">357</FONT> if (file == null) {<a name="line.357"></a><FONT color="green">358</FONT> throw new IllegalArgumentException("Null 'file' argument.");<a name="line.358"></a><FONT color="green">359</FONT> }<a name="line.359"></a><FONT color="green">360</FONT> if (chart == null) {<a name="line.360"></a><FONT color="green">361</FONT> throw new IllegalArgumentException("Null 'chart' argument.");<a name="line.361"></a><FONT color="green">362</FONT> }<a name="line.362"></a><FONT color="green">363</FONT> <a name="line.363"></a><FONT color="green">364</FONT> OutputStream out = new BufferedOutputStream(new FileOutputStream(file));<a name="line.364"></a><FONT color="green">365</FONT> writeChartAsPNG(<a name="line.365"></a><FONT color="green">366</FONT> out, chart, width, height, info, encodeAlpha, compression<a name="line.366"></a><FONT color="green">367</FONT> );<a name="line.367"></a><FONT color="green">368</FONT> out.close();<a name="line.368"></a><FONT color="green">369</FONT> <a name="line.369"></a><FONT color="green">370</FONT> }<a name="line.370"></a><FONT color="green">371</FONT> <a name="line.371"></a><FONT color="green">372</FONT> /**<a name="line.372"></a><FONT color="green">373</FONT> * Writes a chart to an output stream in JPEG format. Please note that<a name="line.373"></a><FONT color="green">374</FONT> * JPEG is a poor format for chart images, use PNG if possible.<a name="line.374"></a><FONT color="green">375</FONT> * <a name="line.375"></a><FONT color="green">376</FONT> * @param out the output stream (<code>null</code> not permitted).<a name="line.376"></a><FONT color="green">377</FONT> * @param chart the chart (<code>null</code> not permitted).<a name="line.377"></a><FONT color="green">378</FONT> * @param width the image width.<a name="line.378"></a><FONT color="green">379</FONT> * @param height the image height.<a name="line.379"></a><FONT color="green">380</FONT> *<a name="line.380"></a><FONT color="green">381</FONT> * @throws IOException if there are any I/O errors.<a name="line.381"></a><FONT color="green">382</FONT> */<a name="line.382"></a><FONT color="green">383</FONT> public static void writeChartAsJPEG(OutputStream out,<a name="line.383"></a><FONT color="green">384</FONT> JFreeChart chart,<a name="line.384"></a><FONT color="green">385</FONT> int width,<a name="line.385"></a><FONT color="green">386</FONT> int height) throws IOException {<a name="line.386"></a><FONT color="green">387</FONT> <a name="line.387"></a><FONT color="green">388</FONT> // defer argument checking...<a name="line.388"></a><FONT color="green">389</FONT> writeChartAsJPEG(out, chart, width, height, null);<a name="line.389"></a><FONT color="green">390</FONT> <a name="line.390"></a><FONT color="green">391</FONT> }<a name="line.391"></a><FONT color="green">392</FONT> <a name="line.392"></a><FONT color="green">393</FONT> /**<a name="line.393"></a><FONT color="green">394</FONT> * Writes a chart to an output stream in JPEG format. Please note that<a name="line.394"></a><FONT color="green">395</FONT> * JPEG is a poor format for chart images, use PNG if possible.<a name="line.395"></a><FONT color="green">396</FONT> *<a name="line.396"></a><FONT color="green">397</FONT> * @param out the output stream (<code>null</code> not permitted).<a name="line.397"></a><FONT color="green">398</FONT> * @param quality the quality setting.<a name="line.398"></a><FONT color="green">399</FONT> * @param chart the chart (<code>null</code> not permitted).<a name="line.399"></a><FONT color="green">400</FONT> * @param width the image width.<a name="line.400"></a><FONT color="green">401</FONT> * @param height the image height.<a name="line.401"></a><FONT color="green">402</FONT> *<a name="line.402"></a><FONT color="green">403</FONT> * @throws IOException if there are any I/O errors.<a name="line.403"></a><FONT color="green">404</FONT> */<a name="line.404"></a><FONT color="green">405</FONT> public static void writeChartAsJPEG(OutputStream out,<a name="line.405"></a>⌨️ 快捷键说明
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