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This example demonstrates how to set a clipping area using a shape. The example sets an oval for the clipping area and then draws and image. Only thos 阅读全文
posted @ 2018-09-02 22:02
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This example demonstrates how to convert between a color value in RGB (three integer values in the range 0 to 255 representing red, green, and blue) a 阅读全文
posted @ 2018-09-02 22:02
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To draw on the screen, it is first necessary to subclass a JComponent and override its paint() method. The paint() method is automatically called by t 阅读全文
posted @ 2018-09-02 22:01
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This is the simplest application to animate an array of images. 阅读全文
posted @ 2018-09-02 22:00
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// See e575 The Quintessential Drawing Program public void paint(Graphics g) { // Retrieve the graphics context; this object is used to paint shapes Graphics2D g2d = (Graphics2D)g;... 阅读全文
posted @ 2018-09-02 22:00
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The print dialog allows the user to change the default printer settings such as the default printer, number of copies, range of pages, etc. 阅读全文
posted @ 2018-09-02 21:58
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PrinterJob pjob = PrinterJob.getPrinterJob(); PageFormat pf = pjob.defaultPage(); if (portrait) { pf.setOrientation(PageFormat.PORTRAIT); } else { pf.setOrientation(... 阅读全文
posted @ 2018-09-02 21:58
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A Book object is used when printing pages with different page formats. This example prints the first page in landscape and five more pages in portrait 阅读全文
posted @ 2018-09-02 21:57
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Note that (0, 0) of the Graphics object is at the top-left of the actual page, which is outside the printable area. 阅读全文
posted @ 2018-09-02 21:56
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Note that (0, 0) of the Graphics object is at the top-left of the actual page, outside the printable area. In this example, the Graphics object is tra 阅读全文
posted @ 2018-09-02 21:55
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The page format dialog allows the user to change the default page format values such as the orientation and paper size. 阅读全文
posted @ 2018-09-02 21:55
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Images in accelerated memory are much faster to draw on the screen. This example demonstrates how to take an image and make an accelerated copy of it 阅读全文
posted @ 2018-09-02 21:54
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This example demonstrates a 3x3 kernel that sharpens an image. 阅读全文
posted @ 2018-09-02 21:53
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ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY); ColorConvertOp op = new ColorConvertOp(cs, null); bufferedImage = op.filter(bufferedImage, null); Related Examples 阅读全文
posted @ 2018-09-02 21:53
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This example demonstrates how to convert a byte array of pixel values that are indices to a color table into a BufferedImage. In particular, the examp 阅读全文
posted @ 2018-09-02 21:52
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// Get a pixel int rgb = bufferedImage.getRGB(x, y); // Get all the pixels int w = bufferedImage.getWidth(null); int h = bufferedImage.getHeight(null); int[] rgbs = new ... 阅读全文
posted @ 2018-09-02 21:51
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This example demonstrates how to convert a byte array of pixel values that are indices to a color table into an Image. In particular, the example gene 阅读全文
posted @ 2018-09-02 21:51
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An Image object cannot be converted to a BufferedImage object. The closest equivalent is to create a buffered image and then draw the image on the buf 阅读全文
posted @ 2018-09-02 21:50
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This example demonstrates a 3x3 kernel that blurs an image. 阅读全文
posted @ 2018-09-02 21:50
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// This method returns true if the specified image has transparent pixels public static boolean hasAlpha(Image image) { // If buffered image, the color model is readily available ... 阅读全文
posted @ 2018-09-02 21:49
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// This method returns the color model of an image public static ColorModel getColorModel(Image image) { // If buffered image, the color model is readily available if (image instan... 阅读全文
posted @ 2018-09-02 21:48
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A IndexColorModel is used to represent the color table of a GIF image. 阅读全文
posted @ 2018-09-02 21:48
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Images in accelerated memory are much faster to draw on the screen. However, accelerated memory is typically limited and it is usually necessary for a 阅读全文
posted @ 2018-09-02 21:48
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// To create a buffered image, see e666 创建缓冲图像 // Flip the image vertically AffineTransform tx = AffineTransform.getScaleInstance(1, -1); tx.translate(0, -image.getHeight(null)); ... 阅读全文
posted @ 2018-09-02 21:47
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This example demonstrates a 3x3 kernel that embosses an image. 阅读全文
posted @ 2018-09-02 21:46
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This example demonstrates how to create a filter that can modify any of the RGB pixel values in an image. Here's some code that uses the filter: 阅读全文
posted @ 2018-09-02 21:46
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To draw on a buffered image, create a graphics context on the buffered image. If the buffered image supports transparency, (see e661 确定图像中是否有透明像素), pi 阅读全文
posted @ 2018-09-02 21:45
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AffineTransform tx = new AffineTransform(); tx.scale(scalex, scaley); tx.shear(shiftx, shifty); tx.translate(x, y); tx.rotate(radians, bufferedImage.getWidth()/2, bufferedImage.getHei... 阅读全文
posted @ 2018-09-02 21:44
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// From an Image image = createImage(new FilteredImageSource(image.getSource(), new CropImageFilter(x, y, w, h))); // From a BufferedImage bufferedImage = bufferedImage.getSubimage... 阅读全文
posted @ 2018-09-02 21:44
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// This method returns an Image object from a buffered image public static Image toImage(BufferedImage bufferedImage) { return Toolkit.getDefaultToolkit().createImage(bufferedImage.g... 阅读全文
posted @ 2018-09-02 21:43
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A buffered image is a type of image whose pixels can be modified. For example, you can draw on a buffered image and then draw the resulting buffered i 阅读全文
posted @ 2018-09-02 21:43
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This example demonstrates how to brighten or darken an RGB buffered image by scaling the red, green, and blue values in the image. If the image is not 阅读全文
posted @ 2018-09-02 21:42
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Shape line = new Line2D.Float(x1, y1, x2, y2); Shape arc = new Arc2D.Float(x, y, w, h, start, extent, type); Shape oval = new Ellipse2D.Float(x, y, w, h); Shape rectangle = new Rectangle2D... 阅读全文
posted @ 2018-09-02 21:38
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AffineTransform tx = new AffineTransform(); tx.scale(scalex, scaley); tx.shear(shiftx, shifty); tx.translate(x, y); tx.rotate(radians); Shape newShape = tx.createTransformedShape(... 阅读全文
posted @ 2018-09-02 21:38
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GeneralPath shape = new GeneralPath(); shape.moveTo(x, y); shape.lineTo(x, y); shape.quadTo(controlPointX, controlPointY, x, y); shape.curveTo(controlPointX1, controlPointY1, controlP... 阅读全文
posted @ 2018-09-02 21:37
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Area shape = new Area(shape1); shape.add(new Area(shape2)); shape.subtract(new Area(shape3)); shape.intersect(new Area(shape4)); shape.exclusiveOr(new Area(shape5)); Related Exa... 阅读全文
posted @ 2018-09-02 21:36
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Shape getTextShape(Graphics2D g2d, String str, Font font) { FontRenderContext frc = g2d.getFontRenderContext(); TextLayout tl = new TextLayout(str, font, frc); return tl.getOut... 阅读全文
posted @ 2018-09-02 21:34
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This example applies a new font and background color to a part of the text. You can apply styles to as many parts of the text as you need. See TextAtt 阅读全文
posted @ 2018-09-02 21:34
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A font family refers to a set of font faces with a related typographic design. For example, the font faces in the family Lucida Sans Typewriter might 阅读全文
posted @ 2018-09-02 21:33
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To create a Font object to draw text, it is necessary to specify the font face name. This example demonstrates how to retrieve all the font face names 阅读全文
posted @ 2018-09-02 21:33
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In order to change the font of the text, you need to supply an attributed string to the LineBreakMeasurer. See e655 混合风格的文本 for an example. 阅读全文
posted @ 2018-09-02 21:30
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component.addMouseListener(new MyMouseListener()); public class MyMouseListener extends MouseAdapter { public void mouseClicked(MouseEvent evt) { if (evt.getClickCoun... 阅读全文
posted @ 2018-09-02 21:29
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You can get the key that was pressed either as a key character (which is a Unicode character) or as a key code (a special value representing a particu 阅读全文
posted @ 2018-09-02 21:28
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component.addMouseListener(new MyMouseListener()); public class MyMouseListener extends MouseAdapter { public void mouseClicked(MouseEvent evt) { if ((evt.getModifier... 阅读全文
posted @ 2018-09-02 21:28
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component.addMouseMotionListener(new MyMouseMotionListener()); public class MyMouseMotionListener extends MouseMotionAdapter { public void mouseMoved(MouseEvent evt) { ... 阅读全文
posted @ 2018-09-02 21:28
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If an event handler is specific to a component (that is, not shared by other components), there is no need to declare a class to handle the event. The 阅读全文
posted @ 2018-09-02 21:24
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An object wishing to fire item events must implement ItemSelectable. This example shows typical code that an object must implement to fire item events 阅读全文
posted @ 2018-09-02 21:24
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component.addFocusListener(new MyFocusListener()); public class MyFocusListener extends FocusAdapter { public void focusGained(FocusEvent evt) { // The component gain... 阅读全文
posted @ 2018-09-02 21:23
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Action events are fired by subclasses of AbstractButton and includes buttons, checkboxes, and menus. 阅读全文
posted @ 2018-09-02 21:14
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public class DropTargetComponent extends JComponent implements DropTargetListener { public DropTargetComponent() { new DropTarget(this, this); } public void dragE... 阅读全文
posted @ 2018-09-02 21:13
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This example demonstrates the code needed to make a component draggable. The object being transferred in this example is a string. 阅读全文
posted @ 2018-09-02 21:12
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The drop target in this example only accepts dropped String objects. A drop target must implement DropTargetListener and supply an implementation for 阅读全文
posted @ 2018-09-02 21:12
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Setting an image on the system clipboard requires a custom Transferable object to hold the image while on the clipboard. 阅读全文
posted @ 2018-09-02 21:11
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This examples defines methods for getting and setting text on the system clipboard. 阅读全文
posted @ 2018-09-02 21:10
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See also e551 精简的Applet. 阅读全文
posted @ 2018-09-02 21:08
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// See also e551 精简的Applet applet.showStatus("Your Message Here"); Related Examples 阅读全文
posted @ 2018-09-02 21:08
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// See also e551 精简的Applet public void init() { // Load audio clip AudioClip ac = getAudioClip(getDocumentBase(), "http://hostname.com/audio.au"); // Play audio clip... 阅读全文
posted @ 2018-09-02 21:07
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try { URL url = new URL("http://hostname/audio.au"); AudioClip ac = Applet.newAudioClip(url); ac.play(); } catch (MalformedURLException e) { } Related Examples ... 阅读全文
posted @ 2018-09-02 21:06
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An applet can be configured through the use of applet parameters. For example, the contents for a news ticker applet could be specified through an app 阅读全文
posted @ 2018-09-02 21:05
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// See also e551 精简的Applet try { URL url = new URL(getDocumentBase(), "http://hostname.com/page.html"); applet.getAppletContext().showDocument(url); } catch (Malformed... 阅读全文
posted @ 2018-09-02 21:05
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Every applet must subclass Applet. Here is an example of an HTML file that will cause the browser to load and start the applet: 阅读全文
posted @ 2018-09-02 21:04
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This is the simplest applet to animate an array of images. In practice, you should use double-buffering (which this example does not use) to eliminate 阅读全文
posted @ 2018-09-02 21:03
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The try/catch statement encloses some code and is used to handle errors and exceptions that might occur in that code. Here is the general syntax of th 阅读全文
posted @ 2018-09-02 21:01
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The if statement encloses some code which is executed only if a condition is true. The general syntax of the if statement is: The if statement has two 阅读全文
posted @ 2018-09-02 20:59
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The for statement can be used to conveninently iterate over the elements of an array. The general syntax of the array-based for statement is: The arra 阅读全文
posted @ 2018-09-02 20:58
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All errors and exceptions extend from Throwable. By catching Throwable, it is possible to handle all unexpected conditions. There are several scenario 阅读全文
posted @ 2018-09-02 20:57
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