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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 MainClass {
public static void main(String[] a) {
final Display d = new Display();
final Shell shell = new Shell(d);
shell.setSize(250, 200);
shell.setLayout(new FillLayout());
// Create a canvas
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 halfY = (int) maxY / 2;
e.gc.setForeground(e.display.getSystemColor(SWT.COLOR_BLACK));
e.gc.drawLine(0, halfY, maxX, halfY);
for (int i = 0; i < maxX; i++) {
e.gc.drawPoint(i, getNormalizedSine(i, halfY, maxX));
}
}
int getNormalizedSine(int x, int halfY, int maxX) {
double piDouble = 2 * Math.PI;
double factor = piDouble / maxX;
return (int) (Math.sin(x * factor) * halfY + halfY);
}
});
shell.open();
while (!shell.isDisposed()) {
if (!d.readAndDispatch())
d.sleep();
}
d.dispose();
}
}
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