hardcopywriter.java

java 的164个例子的源代码,包括了 很多方面,供包括了19个方面的 源代码

	synchronized (this.lock) {
	    // Try to set a new font, but restore current one if it fails
	    Font current = font;
	    try { font = new Font("Monospaced", style, fontsize); }
	    catch (Exception e) { font = current; }
	    // If a page is pending, set the new font. Otherwise newpage() will
	    if (page != null) page.setFont(font);
	}
    }
    
    /** End the current page.  Subsequent output will be on a new page. */
    public void pageBreak() { synchronized(this.lock) { newpage(); } }
    
    /** Return the number of columns of characters that fit on the page */
    public int getCharactersPerLine() { return this.chars_per_line; }
    
    /** Return the number of lines that fit on a page */
    public int getLinesPerPage() { return this.lines_per_page; }
    
    /** This internal method begins a new line */
    protected void newline() {
	charnum = 0;                      // Reset character number to 0
	linenum++;                        // Increment line number
	if (linenum >= lines_per_page) {  // If we've reached the end of page
	    page.dispose();                 //  send page to printer
	    page = null;                    //  but don't start a new page yet.
	}
    }
    
    /** This internal method begins a new page and prints the header. */
    protected void newpage() {
	page = job.getGraphics();              // Begin the new page
	linenum = 0; charnum = 0;              // Reset line and char number
	pagenum++;                             // Increment page number
	page.setFont(headerfont);              // Set the header font.
	page.drawString(jobname, x0, headery); // Print job name left justified
	
	String s = "- " + pagenum + " -";      // Print the page # centered.
	int w = headermetrics.stringWidth(s);
	page.drawString(s, x0 + (this.width - w)/2, headery);
	w = headermetrics.stringWidth(time);   // Print date right justified
	page.drawString(time, x0 + width - w, headery);
	
	// Draw a line beneath the header
	int y = headery + headermetrics.getDescent() + 1;
	page.drawLine(x0, y, x0+width, y);
	
	// Set the basic monospaced font for the rest of the page.
	page.setFont(font);
    }
    
    /**
     * This is the exception class that the HardcopyWriter constructor
     * throws when the user clicks "Cancel" in the print dialog box.
     **/
    public static class PrintCanceledException extends Exception {
	public PrintCanceledException(String msg) { super(msg); }
    }
    
    /**
     * A program that prints the specified file using HardcopyWriter
     **/
    public static class PrintFile {
	public static void main(String[] args) {
	    try {
		if (args.length != 1) 
		    throw new IllegalArgumentException("Wrong # of arguments");
		FileReader in = new FileReader(args[0]);
		HardcopyWriter out = null;
		Frame f = new Frame("PrintFile: " + args[0]);
		f.setSize(200, 50);
		f.show();
		try {
		    out = new HardcopyWriter(f, args[0], 10, .5, .5, .5, .5);
		} 
		catch (HardcopyWriter.PrintCanceledException e) {
		    System.exit(0);
		}
		f.setVisible(false);
		char[] buffer = new char[4096];
		int numchars;
		while((numchars = in.read(buffer)) != -1) 
		    out.write(buffer, 0, numchars);
		in.close();
		out.close();
	    }
	    catch (Exception e) {
		System.err.println(e);
		System.err.println("Usage: " +
				   "java HardcopyWriter$PrintFile <filename>");
		System.exit(1);
	    }
	    System.exit(0); 
	}
    }
    
    /** 
     * A program that prints a demo page using HardcopyWriter
     **/
    public static class Demo extends Frame implements ActionListener {
	/** The main method of the program.  Create a test window */
	public static void main(String[] args) {
	    Frame f = new Demo();
	    f.show();
	}
	// Buttons used in this program
	protected Button print, quit;
	
	/** Constructor for the test program's window. */
	public Demo() {
	    super("HardcopyWriter Test");          // Call frame constructor
	    Panel p = new Panel();                 // Add a panel to the frame
	    this.add(p, "Center");                 // Center it
	    p.setFont(new Font("SansSerif",        // Set a default font
			       Font.BOLD, 18));
	    print = new Button("Print Test Page"); // Create a Print button
	    quit = new Button("Quit");             // Create a Quit button
	    print.addActionListener(this);         // Specify that we'll handle
	    quit.addActionListener(this);          //   button presses
	    p.add(print);                          // Add the buttons to panel
	    p.add(quit);
	    this.pack();                           // Set the frame size
	}
	
	/** Handle the button presses */
	public void actionPerformed(ActionEvent e) {
	    Object o = e.getSource();
	    if (o == quit) System.exit(0);
	    else if (o == print) printDemoPage();
	}
	
	/** Print the demo page */
	public void printDemoPage() {
	    // Create a HardcopyWriter, using a 14 point font and 3/4" margins.
	    HardcopyWriter hw;
	    try { hw=new HardcopyWriter(this, "Demo Page",14,.75,.75,.75,.75);}
	    catch (HardcopyWriter.PrintCanceledException e) { return; }
	    
	    // Send output to it through a PrintWriter stream
	    PrintWriter out = new PrintWriter(hw);
	    
	    // Figure out the size of the page
	    int rows = hw.getLinesPerPage(), cols = hw.getCharactersPerLine();
	    
	    // Mark upper left and upper-right corners
	    out.print("+");                            // upper-left corner
	    for(int i=0;i<cols-2;i++) out.print(" ");  // space over
	    out.print("+");                            // upper-right corner
	    
	    // Display a title
	    hw.setFontStyle(Font.BOLD + Font.ITALIC);
	    out.println("\n\t\tHardcopy Writer Demo Page\n\n");
	    
	    // Demonstrate font styles
	    hw.setFontStyle(Font.BOLD);
	    out.println("Font Styles:");
	    int[] styles = { Font.PLAIN, Font.BOLD,
			     Font.ITALIC, Font.ITALIC+Font.BOLD };
	    for(int i = 0; i < styles.length; i++) {
		hw.setFontStyle(styles[i]);
		out.println("ABCDEFGHIJKLMNOPQRSTUVWXYZ" + 
			    "abcdefghijklmnopqrstuvwxyz");
		out.println("1234567890!@#$%^&*()[]{}<>,.?:;+-=/\\`'\"_~|");
	    }
	    hw.setFontStyle(Font.PLAIN);
	    out.println("\n");
	    
	    // Demonstrate tab stops
	    hw.setFontStyle(Font.BOLD);
	    out.println("Tab Stops:");
	    hw.setFontStyle(Font.PLAIN);
	    out.println("          1         2         3         4         5");
	    out.println("012345678901234567890123456789012345678901234567890");
	    out.println("^\t^\t^\t^\t^\t^\t^");
	    out.println("\n");
	    
	    // Output some information about page dimensions and resolution
	    hw.setFontStyle(Font.BOLD);
	    out.println("Dimensions:");
	    hw.setFontStyle(Font.PLAIN);
	    out.println("\tResolution: " + hw.pagedpi + " dots per inch");
	    out.println("\tPage width (pixels): " + hw.pagesize.width);
	    out.println("\tPage height (pixels): " + hw.pagesize.height);
	    out.println("\tWidth inside margins (pixels): " + hw.width);
	    out.println("\tHeight inside margins (pixels): " + hw.height);
	    out.println("\tCharacters per line: " + cols);
	    out.println("\tLines per page: " + rows);
	    
	    // Skip down to the bottom of the page
	    for(int i = 0; i < rows-30; i++) out.println();

	    // And mark the lower left and lower right
	    out.print("+");                            // lower-left
	    for(int i=0;i<cols-2;i++) out.print(" ");  // space-over
	    out.print("+");                            // lower-right
	    
	    // Close the output stream, forcing the page to be printed
	    out.close();
	}
    }
}