public class ScrNoFlick extends Applet
import java.applet.*; import java.awt.*;
public class ScrNoFlick extends Applet implements Runnable { private Thread m_ScrNoFlick = null; private String m_Text = "Scrolling String"; private final String PARAM_Text = "Text"; int m_StringSize; int m_CurrentXPosition;
private Image m_MemImage; private Graphics m_MemImage_Graphics; Dimension m_MemImageDim = null;
public String getAppletInfo() { return "Name: ScrNoFlick\r\n" + "Author: Alexandr Frolov\r\n" + "E-mail: frolov@glas.apc.org\r\n" + "Web: http://www.glasnet.ru/~frolov," + " http://www.dials.ccas.ru/frolov"; }
public String[][] getParameterInfo() { String[][] info = { { PARAM_Text, "String", "Scrolling String" }, }; return info; }
public void init() { String param;
param = getParameter(PARAM_Text);
if (param != null) m_Text = param;
FontMetrics fm = getFontMetrics(getFont());
m_StringSize = fm.stringWidth(m_Text);
m_CurrentXPosition = size().width; setBackground(Color.yellow);
}
public void update(Graphics g) { Dimension d = size();
int nWidth = d.width; int nHeight = d.height;
if((m_MemImageDim == null) || (m_MemImageDim.width != nWidth) || (m_MemImageDim.height != nHeight)) { m_MemImageDim = new Dimension(nWidth, nHeight);
m_MemImage = createImage(nWidth, nHeight);
m_MemImage_Graphics = m_MemImage.getGraphics();
}
Color fg = getForeground();
Color bg = getBackground();
m_MemImage_Graphics.setColor(bg);
m_MemImage_Graphics.fillRect(0, 0, m_MemImageDim.width, m_MemImageDim.height);
m_MemImage_Graphics.setColor(fg);
m_MemImage_Graphics.drawString(m_Text, m_CurrentXPosition, 20);
m_CurrentXPosition-;
if(m_CurrentXPosition < -m_StringSize) m_CurrentXPosition = size().width;
paint(g);
}
public void paint(Graphics g) { if(m_MemImage != null) g.drawImage(m_MemImage, 0, 0, null);
}
public void start() { if (m_ScrNoFlick == null) { m_ScrNoFlick = new Thread(this);
m_ScrNoFlick.start();
} }
public void stop() { if (m_ScrNoFlick != null) { m_ScrNoFlick.stop();
m_ScrNoFlick = null; } } public void run() { while (true) { try { repaint();
Thread.sleep(50);
} catch (InterruptedException e) { stop();
} } } }
