GC: implement a simple scribble program

 


/*
 * GC example snippet: implement a simple scribble program
 *
 * For a list of all SWT example snippets see
 * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;

public class Snippet66 {

  public static void main(String[] args) {
    Display display = new Display();
    final Shell shell = new Shell(display);
    Listener listener = new Listener() {
      int lastX = 0, lastY = 0;

      public void handleEvent(Event event) {
        switch (event.type) {
        case SWT.MouseMove:
          if ((event.stateMask & SWT.BUTTON1) == 0)
            break;
          GC gc = new GC(shell);
          gc.drawLine(lastX, lastY, event.x, event.y);
          gc.dispose();
        // FALL THROUGH
        case SWT.MouseDown:
          lastX = event.x;
          lastY = event.y;
          break;
        }
      }
    };
    shell.addListener(SWT.MouseDown, listener);
    shell.addListener(SWT.MouseMove, listener);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}

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GC: implement a simple scribble program : 2D « SWT JFace Eclipse « Java

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