ScrollText

Java Source:

/*
 *		ScrollM by Morgan Andersson @ www.mogge3d.com (2001)
 *
 *		Please read the documentation if you want to
 *		make changes to this code.
 *
 */
import java.awt.*;

public class ScrollM extends java.applet.Applet implements Runnable
{
	String scrolltxt;
	Color bgcolor = new Color(0xFFFFFF);
	Color textcolor = new Color(0x000000);
	
	Thread task;
	Image offscreenImage;
	Graphics offscreenGfx;
	Font theFont;
	FontMetrics fm;
	int stringheight,stringwidth,xpos,ypos;
	boolean movestring;
	boolean moveleft;
	int speedleft=20,speedright=20;
	int pixleft=1,pixright=1;
	Point start,end;
	int fontsize=10;
	String fontname;

	public void init()
	{
		String str;
		
		fontname = getParameter("fontname"); if(fontname == null)
				fontname = new String("Verdana");
	
		str = getParameter("fontsize"); if(str != null)
				fontsize = Integer.valueOf(str).intValue();

		theFont = new Font(fontname,Font.PLAIN,fontsize);
		fm = getFontMetrics(theFont);
		offscreenImage = createImage(this.size().width,this.size().height);
		offscreenGfx = offscreenImage.getGraphics();
	
		scrolltxt = getParameter("text");
			if(scrolltxt == null)
				scrolltxt = new String("Error, Please refer to the doc file");				
				
		stringheight = fm.getHeight();
		stringwidth = fm.stringWidth(scrolltxt);
		ypos = (this.size().height + stringheight/2)/2;
		movestring = true;
		
		str = getParameter("msleft"); if(str != null)
			speedleft = Integer.valueOf(str).intValue();
		str = getParameter("msright"); if(str != null)
			speedright = Integer.valueOf(str).intValue();
		str = getParameter("pixleft"); if(str != null)
	 		pixleft = Integer.valueOf(str).intValue();
		str = getParameter("pixright"); if(str != null)
			pixright = Integer.valueOf(str).intValue();
		str = getParameter("textcolor"); if(str != null)
			textcolor = new Color(Integer.parseInt(str, 16));
		str = getParameter("bgcolor"); if(str != null)
			bgcolor = new Color(Integer.parseInt(str, 16));

		setBackground(bgcolor);
	}
	
	public void start()
	{
		if (task==null);
		{
			task = new Thread(this);
			task.start();
		}
	}
	
	public void stop()
	{
		if (task!=null)
		{
			task.stop();
			task = null;
		}
	}

	public boolean mouseDown(Event evt,int x,int y)	
	{
		movestring = false;
		return true;
	}
	
	public boolean mouseUp(Event evt,int x,int y)
	{
		movestring = true;
		repaint();
		return true;
	}

	public void run()
	{
		while (true)
		{
			for(xpos=this.size().width;xpos>0 - stringwidth;xpos=xpos-pixleft)
			{
				moveleft = true;
				repaint();
				try {Thread.sleep(speedleft);}
				catch (InterruptedException e) {}
			}
			for(xpos=0-stringwidth;xpos<=this.size().width;xpos=xpos+pixright)
			{
				moveleft = false;
				repaint();
				try {Thread.sleep(speedright);}
				catch	(InterruptedException e) {}
			}
		}
	}
	
	public void update (Graphics g)
	{
		paint(g);
	}
	
	public void paint (Graphics g)
	{
		offscreenGfx.setColor(getBackground());
		offscreenGfx.fillRect(0,0,this.size().width,this.size().height);
		
		offscreenGfx.setFont(theFont);
		offscreenGfx.setColor(textcolor);
		if(movestring == true)
		{
			offscreenGfx.drawString(scrolltxt,xpos,ypos);
		}
		else if(movestring == false)
		{
			if(moveleft == true)
			{
			 	xpos = xpos+1;
				offscreenGfx.drawString(scrolltxt,xpos,ypos);
			}
			else if(moveleft == false)
			{
				xpos = xpos-1;
				offscreenGfx.drawString(scrolltxt,xpos,ypos);
			}
		}		
		g.drawImage(offscreenImage,0,0,this);
	}
}

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