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MyCanvas.java
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1996-04-23
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import java.awt.*;
class MyCanvas extends Canvas implements Runnable {
Thread thread = null;
int Refresh = 50;
protected Image img = null;
protected Graphics grps = null;
Class c = null;
MyWidget mw = null;
MyCanvas( String classname ) {
try{
c = Class.forName( classname );
}
catch ( ClassNotFoundException e) {
System.err.println("Sorry - but i cannot find a class named \"" + classname + "\"");
System.exit(-1);
}
try {
mw = (MyWidget) c.newInstance();
}
catch ( Exception e) {
System.err.println("Creating an instance of \"" + classname + "\" have failed.");
System.exit(-1);
}
}
public String getWidgetName() {
return mw.getClass().getName();
}
// start/stop animation
public void start() {
if(thread==null) {
thread = new Thread( this, ""); // thread starten, falls noch nicht getan
thread.start();
} }
public void stop() { thread = null; }
public void run() {
while( thread != null )
{
repaint();
try { thread.sleep(Refresh); }
catch( InterruptedException e ) {}
} }
public void paint(Graphics g) {
if(img!=null) {
g.drawImage( img, 0, 0, this);
} }
public void update(Graphics g) {
if( grps==null )
{
img = createImage( MyWidget.LEN, MyWidget.LEN );
grps = img.getGraphics();
}
mw.repaint( grps );
g.drawImage( img, 0, 0, this);
}
public Dimension minimumSize() { return new Dimension( MyWidget.LEN, MyWidget.LEN ); }
public Dimension preferredSize() { return minimumSize(); }
}