Drawing Points, Lines and set line width : Line « SWT 2D Graphics « Java Tutorial

1. Java Tutorial
2. SWT 2D Graphics
3. Line

drawLine() takes four integers that define two Cartesian points, relative to the upper-left corner of the component.

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class DrawPointLineWidth {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("Canvas Example");
    shell.setLayout(new FillLayout());

    Canvas canvas = new Canvas(shell, SWT.NONE);

    canvas.addPaintListener(new PaintListener() {
      public void paintControl(PaintEvent e) {
        Canvas canvas = (Canvas) e.widget;
        int maxX = canvas.getSize().x;
        int maxY = canvas.getSize().y;

        int halfX = (int) maxX/2;
        int halfY = (int) maxY/2;

        e.gc.setForeground(e.display.getSystemColor(SWT.COLOR_BLUE));
        e.gc.setLineWidth(10);
        e.gc.drawLine(halfX, 0, halfX, maxY);
        e.gc.drawLine(0, halfY, maxX, halfY);
      }
    });

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

18.5.Line
	18.5.1.	Draw line
	18.5.2.	Drawing multiple lines
	18.5.3.	Drawing Points, Lines and set line width
	18.5.4.	Draw a thick line
	18.5.5.	Setting Line caps
	18.5.6.	Line Join Style: JOIN_BEVEL, JOIN_MITER, JOIN_ROUND