import javax.swing.*; import java.awt.*; import java.awt.geom.*; /** A demonstration of different controls when joining two line * segments. The style of the line end point is controlled * through the capStyle parameter. * ************************************ public class LineStyles extends JPanel { private GeneralPath path; private static int x = 30, deltaX = 150, y …
Tag: code
Aug 28
Illustrates using a local font (Goudy Handtooled BT) to perform drawing in Java 2D
import java.awt.*; /** An example of using local fonts to perform drawing in * Java 2D. * ********************** public class FontExample extends GradientPaintExample { public FontExample() { GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment(); env.getAvailableFontFamilyNames(); setFont(new Font(“Goudy Handtooled BT”, Font.PLAIN, 100)); } protected void drawBigString(Graphics2D g2d) { g2d.setPaint(Color.black); g2d.drawString(“Java …
Aug 28
Draws a circle with a gradient fill
GradientPaintExample.java Draws a circle with a gradient fill. Inherits from ShapeExample.java. ************************************** import java.awt.*; /** An example of applying a gradient fill to a circle. The * color definition starts with red at (0,0), gradually * changing to yellow at (175,175). * ********************************** public class GradientPaintExample extends ShapeExample { private GradientPaint gradient = …
Aug 28
An applet that permits freehand drawing
import java.applet.Applet; import java.awt.*; import java.awt.event.*; /** An applet that lets you perform freehand drawing. * **************** public class SimpleWhiteboard extends Applet { protected int lastX=0, lastY=0; public void init() { setBackground(Color.white); setForeground(Color.blue); addMouseListener(new PositionRecorder()); addMouseMotionListener(new LineDrawer()); } protected void record(int x, int y) { …
Aug 28
A TextField that uses key events to correct the spelling of the names of computer languages entered into it
import java.awt.*; import java.awt.event.*; /** A spelling-correcting TextField for entering * a language name. * ******************* public class LanguageField extends TextField { private String[] substrings = { “”, “J”, “Ja”, “Jav”, “Java” }; public LanguageField() { addKeyListener(new SpellingCorrector()); addActionListener(new WordCompleter()); addFocusListener(new SubliminalAdvertiser()); } // Put caret …
Aug 28
DebugTag.java Custom tag that optionally makes use of a tag body
DebugTag.java Custom tag that optionally makes use of a tag body package cwp.tags; import javax.servlet.jsp.*; import javax.servlet.jsp.tagext.*; import java.io.*; import javax.servlet.*; /** A tag that includes the body content only if * the “debug” request parameter is set. * <P> * Taken from Core Web Programming Java 2 Edition * from Prentice Hall and Sun …
Aug 28
HeadingTag.java Custom tag that makes use of a tag body
HeadingTag.java Custom tag that makes use of a tag body package cwp.tags; import javax.servlet.jsp.*; import javax.servlet.jsp.tagext.*; import java.io.*; /** Generates an HTML heading with the specified background * color, foreground color, alignment, font, and font size. * You can also turn on a border around it, which normally * just barely encloses the heading, but …
Aug 28
PrimeTag.java Custom tag that outputs a random prime number of a user-specifiable approximate length
PrimeTag.java Custom tag that outputs a random prime number of a user-specifiable approximate length package cwp.tags; import javax.servlet.jsp.*; import javax.servlet.jsp.tagext.*; import java.io.*; /** Generates an N-digit random prime (default N = 50). * Extends SimplePrimeTag, adding a length attribute * to set the size of the prime. The doStartTag * method of the parent class …
Aug 28
SimplePrimeTag.java Custom tag that outputs a random prime number of a fixed approximate length
SimplePrimeTag.java Custom tag that outputs a random prime number of a fixed approximate length package cwp.tags; import javax.servlet.jsp.*; import javax.servlet.jsp.tagext.*; import java.io.*; import java.math.*; import cwp.*; /** Generates a prime of approximately 50 digits. * (50 is actually the length of the random number * generated — the first prime above that number will * …
Aug 28
cwp-taglib.tld Tag Library Descriptor file used by the custom tags in this chapter.
cwp-taglib.tld Tag Library Descriptor file used by the custom tags in this chapter. <?xml version=”1.0″ encoding=”ISO-8859-1″ ?> <!DOCTYPE taglib PUBLIC “-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN” “http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd”> <!– a tag library descriptor –> <taglib> <!– after this the default space is “http://java.sun.com/j2ee/dtds/jsptaglibrary_1_2.dtd” –> <tlibversion>1.0</tlibversion> <jspversion>1.1</jspversion> <shortname>cwp</shortname> <!– …
