SineFunctionPlotting.java Source code

Introduction

Here is the source code for SineFunctionPlotting.java

Source

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 SineFunctionPlotting {
    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;

                // Calculate the middle
                int halfX = (int) maxX / 2;
                int halfY = (int) maxY / 2;

                // Set the line color and draw a horizontal axis
                e.gc.setForeground(e.display.getSystemColor(SWT.COLOR_BLACK));
                e.gc.drawLine(0, halfY, maxX, halfY);

                // Draw the sine wave
                for (int i = 0; i < maxX; i++) {
                    e.gc.drawPoint(i, getNormalizedSine(i, halfY, maxX));
                }
            }
        });

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

    static 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);
    }
}