SWT: Working with fonts

SWT provides Font class to define font specific to your application. Font class provides following constructors to define Font instances.

         public Font(Device device, FontData fd)

         public Font(Device device, FontData[] fds)

         public Font(Device device, String name, int height, int style)

Ex:

Font font = new Font(display, "Arial", 10, SWT.BOLD | SWT.ITALIC);

Following is the complete working application.

package swt_app;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.graphics.RGBA;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class Test
{

 private static int shellWidth = 1000;
 private static int shellHeight = 700;

 private static int canvasHeight = 300;
 private static int canvasWidth = 400;

 private static void drawGraphcis(Display display, GC gc)
 {
  Color blue = display.getSystemColor(SWT.COLOR_BLUE);
  Color red = display.getSystemColor(SWT.COLOR_RED);
  Color green = new Color(display, new RGB(0, 255, 0));
  Color color = new Color(display, new RGBA(24, 20, 123, 5));

  Font font = new Font(display, "Arial", 10, SWT.BOLD | SWT.ITALIC);
  gc.setFont(font);

  gc.setBackground(red);
  gc.drawRectangle(150, 130, 200, 75);
  gc.fillRectangle(30, 30, 200, 75);

  gc.setForeground(blue);
  gc.drawLine(0, 0, 400, 300);

  gc.drawString("Hello World Graphics Application", 75, 0);

  gc.drawOval(0, 0, 400, 300);

  green.dispose();
  color.dispose();
  font.dispose();

 }

 private static void addGraphicsToShell(Display display, Shell shell)
 {
  Canvas canvas = new Canvas(shell, SWT.BORDER);
  canvas.setSize(canvasWidth, canvasHeight);
  canvas.setLocation(20, 20);

  /* Open shell window */
  shell.open();

  GC gc = new GC(canvas);

  drawGraphcis(display, gc);

  canvas.addPaintListener(new PaintListener()
  {
   @Override
   public void paintControl(PaintEvent e)
   {
    GC gc = e.gc;
    drawGraphcis(display, gc);
   }

  });
  gc.dispose();

 }

 public static void main(String[] args)
 {

  /* Instantiate Display object, it represents SWT session */
  Display display = new Display();

  /*
   * Define Shell, it represent a window, You can add more than one shell to Display
   */
  Shell shell = new Shell(display);
  shell.setSize(shellWidth, shellHeight);
  shell.setText("SWT Tutorial");

  addGraphicsToShell(display, shell);

  /*
   * Run the event dispatching loop until an exit condition occurs, which is typically when the main shell window
   * is closed by the user.
   */

  while (!shell.isDisposed()) {
   if (!display.readAndDispatch()) {
    display.sleep();
   }
  }

  /* Dispose the display */
  display.dispose();

 }
}

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