/* * ProScroll 2.3 * By Slava Pestov * * You can do whatever you want with this file, as long as this notice * is left intact and credit is given to the original author. */ import java.applet.Applet; import java.net.URL; import java.net.URLConnection; import java.io.InputStream; import java.awt.Image; import java.awt.Graphics; import java.awt.Color; import java.awt.Font; import java.awt.FontMetrics; import java.awt.Event; import java.awt.MediaTracker; import java.util.Enumeration; import java.util.Vector; import java.util.StringTokenizer; public class ProScroll extends Applet implements Runnable { // Instance variables private Thread thread; private Image image; private int scrollLength, scrolled, speed = 10, imgsWidth; private URL url; private String target; private Color bgColor; // Initialize the applet public void init() { Enumeration images; String fontName; int fontSize = 12, fontStyle = 0; String text = getParameter("TEXT"); String textURL = getParameter("TEXTURL"); if(text == null && textURL == null) text = "No TEXT or TEXTURL parameter specified"; if(textURL != null) { StringBuffer buf = new StringBuffer(); try { InputStream in = new URL(textURL) .openConnection().getInputStream(); for(;;) { int i = in.read(); if(i == -1) break; else if(i == '\n') continue; else if(i == '\t') buf.append(' '); else buf.append((char)i); } in.close(); text = buf.toString(); } catch(Exception ex) { if(text == null) text = "Error loading text from URL: " + ex; } } fontName = getParameter("FONT"); if(fontName == null) fontName = "TimesRoman"; target = getParameter("TARGET"); if(target == null) target = "_self"; try { fontSize = Integer.parseInt(getParameter("SIZE")); } catch(Exception e) { } String fontStyleStr = getParameter("STYLE"); if("bold".equals(fontStyleStr)) fontStyle = 1; else if("italic".equals(fontStyleStr)) fontStyle = 2; else if("bolditalic".equals(fontStyleStr)) fontStyle = 3; String speedStr = getParameter("SPEED"); if("slow".equals(speedStr)) speed = 20; else if("medium".equals(speedStr)) speed = 15; else speed = 10; try { url = new URL(getDocumentBase(), getParameter("URL")); } catch(Exception e) { } bgColor = parseColorName(getParameter("BGCOLOR"),Color.black); images = parseAndLoadImages(getParameter("IMAGES")); Font font = new Font(fontName, fontStyle, fontSize); FontMetrics fm = getToolkit().getFontMetrics(font); image = createImage(fm.stringWidth(text) + imgsWidth + size().width, size().height); scrolled = -size().width; parseAndDrawText(image.getGraphics(), text, fm, font, images); } // Draw the text to the offscreen graphics private void parseAndDrawText(Graphics g, String text, FontMetrics fm, Font font, Enumeration images) { g.setFont(font); g.setColor(bgColor); g.fillRect(0,0,image.getWidth(this),image.getHeight(this)); g.setColor(Color.white); StringBuffer buf = new StringBuffer(); boolean readColor = false, slash = false; for(int i = 0; i < text.length(); i++) { char c = text.charAt(i); if(c == '#' && !slash) { if(readColor) { g.setColor(parseColorName(buf.toString(),Color.white)); buf.setLength(0); readColor = false; } else { readColor = true; } } else if(c == '$' && !readColor && !slash) { try { Image img = (Image)(images.nextElement()); g.drawImage(img,scrollLength,0,this); scrollLength += img.getWidth(this); } catch(Exception e) { } } else if(c == '/' && !slash) { slash = true; } else if(readColor) { buf.append(c); } else { if(slash == true) slash = false; g.drawString(String.valueOf(c), scrollLength, fm.getAscent()); scrollLength += fm.charWidth(c); } } } // Converts a color name string to a color object private Color parseColorName(String name, Color defaultColor) { if("red".equals(name)) return Color.red; else if("green".equals(name)) return Color.green; else if("blue".equals(name)) return Color.blue; else if("yellow".equals(name)) return Color.yellow; else if("orange".equals(name)) return Color.orange; else if("white".equals(name)) return Color.white; else if("lightGray".equals(name)) return Color.lightGray; else if("gray".equals(name)) return Color.gray; else if("darkGray".equals(name)) return Color.darkGray; else if("black".equals(name)) return Color.black; else if("cyan".equals(name)) return Color.cyan; else if("magenta".equals(name)) return Color.magenta; else if("pink".equals(name)) return Color.pink; else return defaultColor; } // Load the images private Enumeration parseAndLoadImages(String s) { if(s == null) return null; int i = 0; Vector images = new Vector(); StringTokenizer st = new StringTokenizer(s); MediaTracker tracker = new MediaTracker(this); while(st.hasMoreTokens()) { try { Image image = getImage(new URL(getDocumentBase(), st.nextToken())); images.addElement(image); tracker.addImage(image,i); tracker.waitForID(i++); imgsWidth += image.getWidth(this); } catch(Exception e) { } } return images.elements(); } // Start the main thread public void start() { thread = new Thread(this); thread.start(); } // Stop the main thread public void stop() { thread = null; scrolled = -size().width; } // Thread run method public void run() { while(Thread.currentThread() == thread) { long time = System.currentTimeMillis(); if(++scrolled > scrollLength) scrolled = -size().width; repaint(); try { thread.sleep(Math.max(speed - (System.currentTimeMillis() - time),0)); } catch(InterruptedException e) { } } } // Handle events public boolean mouseEnter(Event e, int x, int y) { if(url != null) getAppletContext().showStatus("Link: " + url.toString()); return true; } public boolean mouseExit(Event e, int x, int y) { if(url != null) getAppletContext().showStatus(""); return true; } public boolean mouseUp(Event e, int x, int y) { if(url != null) getAppletContext().showDocument(url,target); return true; } // Handle drawing public void update(Graphics g) { g.setColor(bgColor); if(scrolled < 0) { g.setColor(bgColor); g.fillRect(0,0,-scrolled,size().height); } g.drawImage(image,-scrolled,0,this); } public void paint(Graphics g) { update(g); } // Return applet info public String getAppletInfo() { return "ProScroll version 2.3 by Slava Pestov"; } }