📄 chartutilities.html
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<FONT color="green">406</FONT> float quality,<a name="line.406"></a><FONT color="green">407</FONT> JFreeChart chart,<a name="line.407"></a><FONT color="green">408</FONT> int width,<a name="line.408"></a><FONT color="green">409</FONT> int height) throws IOException {<a name="line.409"></a><FONT color="green">410</FONT> <a name="line.410"></a><FONT color="green">411</FONT> // defer argument checking...<a name="line.411"></a><FONT color="green">412</FONT> ChartUtilities.writeChartAsJPEG(<a name="line.412"></a><FONT color="green">413</FONT> out, quality, chart, width, height, null<a name="line.413"></a><FONT color="green">414</FONT> );<a name="line.414"></a><FONT color="green">415</FONT> <a name="line.415"></a><FONT color="green">416</FONT> }<a name="line.416"></a><FONT color="green">417</FONT> <a name="line.417"></a><FONT color="green">418</FONT> /**<a name="line.418"></a><FONT color="green">419</FONT> * Writes a chart to an output stream in JPEG format. This method allows <a name="line.419"></a><FONT color="green">420</FONT> * you to pass in a {@link ChartRenderingInfo} object, to collect <a name="line.420"></a><FONT color="green">421</FONT> * information about the chart dimensions/entities. You will need this <a name="line.421"></a><FONT color="green">422</FONT> * info if you want to create an HTML image map.<a name="line.422"></a><FONT color="green">423</FONT> *<a name="line.423"></a><FONT color="green">424</FONT> * @param out the output stream (<code>null</code> not permitted).<a name="line.424"></a><FONT color="green">425</FONT> * @param chart the chart (<code>null</code> not permitted).<a name="line.425"></a><FONT color="green">426</FONT> * @param width the image width.<a name="line.426"></a><FONT color="green">427</FONT> * @param height the image height.<a name="line.427"></a><FONT color="green">428</FONT> * @param info the chart rendering info (<code>null</code> permitted).<a name="line.428"></a><FONT color="green">429</FONT> *<a name="line.429"></a><FONT color="green">430</FONT> * @throws IOException if there are any I/O errors.<a name="line.430"></a><FONT color="green">431</FONT> */<a name="line.431"></a><FONT color="green">432</FONT> public static void writeChartAsJPEG(OutputStream out,<a name="line.432"></a><FONT color="green">433</FONT> JFreeChart chart,<a name="line.433"></a><FONT color="green">434</FONT> int width,<a name="line.434"></a><FONT color="green">435</FONT> int height,<a name="line.435"></a><FONT color="green">436</FONT> ChartRenderingInfo info) <a name="line.436"></a><FONT color="green">437</FONT> throws IOException {<a name="line.437"></a><FONT color="green">438</FONT> <a name="line.438"></a><FONT color="green">439</FONT> if (chart == null) {<a name="line.439"></a><FONT color="green">440</FONT> throw new IllegalArgumentException("Null 'chart' argument.");<a name="line.440"></a><FONT color="green">441</FONT> }<a name="line.441"></a><FONT color="green">442</FONT> BufferedImage image = chart.createBufferedImage(width, height, info);<a name="line.442"></a><FONT color="green">443</FONT> EncoderUtil.writeBufferedImage(image, ImageFormat.JPEG, out);<a name="line.443"></a><FONT color="green">444</FONT> <a name="line.444"></a><FONT color="green">445</FONT> }<a name="line.445"></a><FONT color="green">446</FONT> <a name="line.446"></a><FONT color="green">447</FONT> /**<a name="line.447"></a><FONT color="green">448</FONT> * Writes a chart to an output stream in JPEG format. This method allows <a name="line.448"></a><FONT color="green">449</FONT> * you to pass in a {@link ChartRenderingInfo} object, to collect <a name="line.449"></a><FONT color="green">450</FONT> * information about the chart dimensions/entities. You will need this <a name="line.450"></a><FONT color="green">451</FONT> * info if you want to create an HTML image map.<a name="line.451"></a><FONT color="green">452</FONT> *<a name="line.452"></a><FONT color="green">453</FONT> * @param out the output stream (<code>null</code> not permitted).<a name="line.453"></a><FONT color="green">454</FONT> * @param quality the output quality (0.0f to 1.0f).<a name="line.454"></a><FONT color="green">455</FONT> * @param chart the chart (<code>null</code> not permitted).<a name="line.455"></a><FONT color="green">456</FONT> * @param width the image width.<a name="line.456"></a><FONT color="green">457</FONT> * @param height the image height.<a name="line.457"></a><FONT color="green">458</FONT> * @param info the chart rendering info (<code>null</code> permitted).<a name="line.458"></a><FONT color="green">459</FONT> *<a name="line.459"></a><FONT color="green">460</FONT> * @throws IOException if there are any I/O errors.<a name="line.460"></a><FONT color="green">461</FONT> */<a name="line.461"></a><FONT color="green">462</FONT> public static void writeChartAsJPEG(OutputStream out,<a name="line.462"></a><FONT color="green">463</FONT> float quality,<a name="line.463"></a><FONT color="green">464</FONT> JFreeChart chart,<a name="line.464"></a><FONT color="green">465</FONT> int width,<a name="line.465"></a><FONT color="green">466</FONT> int height,<a name="line.466"></a><FONT color="green">467</FONT> ChartRenderingInfo info) <a name="line.467"></a><FONT color="green">468</FONT> throws IOException {<a name="line.468"></a><FONT color="green">469</FONT> <a name="line.469"></a><FONT color="green">470</FONT> if (chart == null) {<a name="line.470"></a><FONT color="green">471</FONT> throw new IllegalArgumentException("Null 'chart' argument.");<a name="line.471"></a><FONT color="green">472</FONT> }<a name="line.472"></a><FONT color="green">473</FONT> BufferedImage image = chart.createBufferedImage(width, height, info);<a name="line.473"></a><FONT color="green">474</FONT> EncoderUtil.writeBufferedImage(image, ImageFormat.JPEG, out, quality);<a name="line.474"></a><FONT color="green">475</FONT> <a name="line.475"></a><FONT color="green">476</FONT> }<a name="line.476"></a><FONT color="green">477</FONT> <a name="line.477"></a><FONT color="green">478</FONT> /**<a name="line.478"></a><FONT color="green">479</FONT> * Saves a chart to a file in JPEG format.<a name="line.479"></a><FONT color="green">480</FONT> *<a name="line.480"></a><FONT color="green">481</FONT> * @param file the file (<code>null</code> not permitted).<a name="line.481"></a><FONT color="green">482</FONT> * @param chart the chart (<code>null</code> not permitted).<a name="line.482"></a><FONT color="green">483</FONT> * @param width the image width.<a name="line.483"></a><FONT color="green">484</FONT> * @param height the image height.<a name="line.484"></a><FONT color="green">485</FONT> *<a name="line.485"></a><FONT color="green">486</FONT> * @throws IOException if there are any I/O errors.<a name="line.486"></a><FONT color="green">487</FONT> */<a name="line.487"></a><FONT color="green">488</FONT> public static void saveChartAsJPEG(File file,<a name="line.488"></a><FONT color="green">489</FONT> JFreeChart chart,<a name="line.489"></a><FONT color="green">490</FONT> int width,<a name="line.490"></a><FONT color="green">491</FONT> int height) throws IOException {<a name="line.491"></a><FONT color="green">492</FONT> <a name="line.492"></a><FONT color="green">493</FONT> // defer argument checking...<a name="line.493"></a><FONT color="green">494</FONT> saveChartAsJPEG(file, chart, width, height, null);<a name="line.494"></a><FONT color="green">495</FONT> <a name="line.495"></a><FONT color="green">496</FONT> }<a name="line.496"></a><FONT color="green">497</FONT> <a name="line.497"></a><FONT color="green">498</FONT> /**<a name="line.498"></a><FONT color="green">499</FONT> * Saves a chart to a file in JPEG format.<a name="line.499"></a><FONT color="green">500</FONT> *<a name="line.500"></a><FONT color="green">501</FONT> * @param file the file (<code>null</code> not permitted).<a name="line.501"></a><FONT color="green">502</FONT> * @param quality the JPEG quality setting.<a name="line.502"></a><FONT color="green">503</FONT> * @param chart the chart (<code>null</code> not permitted).<a name="line.503"></a><FONT color="green">504</FONT> * @param width the image width.<a name="line.504"></a><FONT color="green">505</FONT> * @param height the image height.<a name="line.505"></a><FONT color="green">506</FONT> *<a name="line.506"></a><FONT color="green">507</FONT> * @throws IOException if there are any I/O errors.<a name="line.507"></a><FONT color="green">508</FONT> */<a name="line.508"></a><FONT color="green">509</FONT> public static void saveChartAsJPEG(File file,<a name="line.509"></a><FONT color="green">510</FONT> float quality,<a name="line.510"></a><FONT color="green">511</FONT> JFreeChart chart,<a name="line.511"></a><FONT color="green">512</FONT> int width,<a name="line.512"></a><FONT color="green">513</FONT> int height) throws IOException {<a name="line.513"></a><FONT color="green">514</FONT> <a name="line.514"></a><FONT color="green">515</FONT> // defer argument checking...<a name="line.515"></a><FONT color="green">516</FONT> saveChartAsJPEG(file, quality, chart, width, height, null);<a name="line.516"></a><FONT color="green">517</FONT> <a name="line.517"></a><FONT color="green">518</FONT> }<a name="line.518"></a><FONT color="green">519</FONT> <a name="line.519"></a><FONT color="green">520</FONT> /**<a name="line.520"></a><FONT color="green">521</FONT> * Saves a chart to a file in JPEG format. This method allows you to pass <a name="line.521"></a><FONT color="green">522</FONT> * in a {@link ChartRenderingInfo} object, to collect information about the <a name="line.522"></a><FONT color="green">523</FONT> * chart dimensions/entities. You will need this info if you want to <a name="line.523"></a><FONT color="green">524</FONT> * create an HTML image map.<a name="line.524"></a><FONT color="green">525</FONT> *<a name="line.525"></a><FONT color="green">526</FONT> * @param file the file name (<code>null</code> not permitted).<a name="line.526"></a><FONT color="green">527</FONT> * @param chart the chart (<code>null</code> not permitted).<a name="line.527"></a><FONT color="green">528</FONT> * @param width the image width.<a name="line.528"></a><FONT color="green">529</FONT> * @param height the image height.<a name="line.529"></a><FONT color="green">530</FONT> * @param info the chart rendering info (<code>null</code> permitted).<a name="line.530"></a><FONT color="green">531</FONT> *<a name="line.531"></a><FONT color="green">532</FONT> * @throws IOException if there are any I/O errors.<a name="line.532"></a><FONT color="green">533</FONT> */<a name="line.533"></a><FONT color="green">534</FONT> public static void saveChartAsJPEG(File file,<a name="line.534"></a><FONT color="green">535</FONT> JFreeChart chart,<a name="line.535"></a><FONT color="green">536</FONT> int width,<a name="line.536"></a><FONT color="green">537</FONT> int height,<a name="line.537"></a><FONT color="green">538</FONT> ChartRenderingInfo info) <a name="line.538"></a><FONT color="green">539</FONT> throws IOException {<a name="line.539"></a><FONT color="green">540</FONT> <a name="line.540"></a><FONT color="green">541</FONT> if (file == null) {<a name="line.541"></a>⌨️ 快捷键说明
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