//Print the flag by pressing the "Print Screen" key; then paste the
//clipboard into another document.

//The following two lines are needed to open and close a window.
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

//The following two lines are needed to let the window repaint itself.
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;

//The following two lines are needed for what we want to draw in the window.
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;

public class Solve {
	public static void main(String[] args) {

		// The following two lines are needed to open the window.
		final Display display = new Display();
		final Shell shell = new Shell(display);

		// Everything from Point A to Point B will be executed
		// whenever the window needs to be redrawn.
		shell.addPaintListener(new PaintListener() {
			public void paintControl(PaintEvent e) {

				// Point A
				GC gc = e.gc; // Graphics Context: the pen you draw with
				final int xmin = -4;
				final int xmax = 4;
				final int ymin = -3;
				final int ymax = 3;
				final int m = 100;	//magnification: how many pixels per unit

				Color black = new Color(display, 0, 0, 0);
				Color white = new Color(display, 255, 255, 255);

				for (int x = m * xmin; x <= m * xmax; ++x) {
					for (int y = m * ymin; y <= m * ymax; ++y) {
						Color color;

						// The last three arguments of Color are the amount of
						// red, green, blue:
						// minimum amount is zero, maximum is 255.

						if (x == 0									//Y axis is vertical
								|| y == 0							//X axis is horizontal
								|| x % m == 0 && Math.abs(y) < 10	//ticks along X axis
								|| y % m == 0 && Math.abs(x) < 10	//ticks along Y axis
								) {
							color = black;
						} else {
							// background
							color = white;
						}

						gc.setForeground(color);
						gc.drawPoint(x - m * xmin, y - m * ymin);
					}

					final int y = x * x * x - x * x;
					gc.setForeground(black);
					gc.drawPoint(x - m * xmin, y - m * ymin);
				}

				gc.dispose(); // don't need gc any more
				// Point B
			}
		});

		shell.setText("Solve an equation");
		shell.open();

		// The following six lines are needed to close the window.
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
		display.dispose();
	}
}