GEEN163 Target Program Write a Java program with a Graphical User Interface (GU)

Question

GEEN163 Target Program Write a Java program with a Graphical User Interface (GU) that calculates how far a ball thrown given speed and angle will travel. The program should ask the user for the angle the ball will be thrown in degrees and the speed in feet per second. The distance a ball will travel can be calculated by at a speed.sin(2 angle) distance where g is the gravitational acceleration of 32.174 Note that the angle given by the user in degrees must be converted to radians for the Java Math class by radians-degrees / 180 feet sec2 You are free to format the GUI in any way that works effectively. Example formats are: nter angle 35 Enter speed 30 Throw ball will hit at 26.285925241105165 Enter angle 45 Enter speed 30 Throw Lball wil hit at 27.97289737054765

Explanation / Answer

import java.awt.BorderLayout; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.geom.AffineTransform; import java.awt.geom.Point2D; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JSlider; import javax.swing.SwingUtilities; public class ProjectileShooterTest { public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { createAndShowGUI(); } }); } private static void createAndShowGUI() { JFrame f = new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setSize(600,600); final ProjectileShooter projectileShooter = new ProjectileShooter(); ProjectileShooterPanel projectileShooterPanel = new ProjectileShooterPanel(projectileShooter); projectileShooter.setPaintingComponent(projectileShooterPanel); JPanel controlPanel = new JPanel(new GridLayout(1,0)); controlPanel.add(new JLabel("Angle")); final JSlider angleSlider = new JSlider(0, 90, 45); controlPanel.add(angleSlider); controlPanel.add(new JLabel("Power")); final JSlider powerSlider = new JSlider(0, 100, 50); controlPanel.add(powerSlider); JButton shootButton = new JButton("Shoot"); shootButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { int angleDeg = angleSlider.getValue(); int power = powerSlider.getValue(); projectileShooter.setAngle(Math.toRadians(angleDeg)); projectileShooter.setPower(power); projectileShooter.shoot(); } }); controlPanel.add(shootButton); f.getContentPane().setLayout(new BorderLayout()); f.getContentPane().add(controlPanel, BorderLayout.NORTH); f.getContentPane().add(projectileShooterPanel, BorderLayout.CENTER); f.setVisible(true); } } class ProjectileShooter { private double angleRad = Math.toRadians(45); private double power = 50; private Projectile projectile; private JComponent paintingComponent; void setPaintingComponent(JComponent paintingComponent) { this.paintingComponent = paintingComponent; } void setAngle(double angleRad) { this.angleRad = angleRad; } void setPower(double power) { this.power = power; } void shoot() { Thread t = new Thread(new Runnable() { @Override public void run() { executeShot(); } }); t.setDaemon(true); t.start(); } private void executeShot() { if (projectile != null) { return; } projectile = new Projectile(); Point2D velocity = AffineTransform.getRotateInstance(angleRad). transform(new Point2D.Double(1,0), null); velocity.setLocation( velocity.getX() * power * 0.5, velocity.getY() * power * 0.5); projectile.setVelocity(velocity); //System.out.println("Initial "+velocity); long prevTime = System.nanoTime(); while (projectile.getPosition().getY() >= 0) { long currentTime = System.nanoTime(); double dt = 3 * (currentTime - prevTime) / 1e8; projectile.performTimeStep(dt); prevTime = currentTime; paintingComponent.repaint(); try { Thread.sleep(10); } catch (InterruptedException e) { Thread.currentThread().interrupt(); return; } } projectile = null; paintingComponent.repaint(); } Projectile getProjectile() { return projectile; } } class Projectile { private final Point2D ACCELERATION = new Point2D.Double(0, -9.81 * 0.1); private final Point2D position = new Point2D.Double(); private final Point2D velocity = new Point2D.Double(); public Point2D getPosition() { return new Point2D.Double(position.getX(), position.getY()); } public void setPosition(Point2D point) { position.setLocation(point); } public void setVelocity(Point2D point) { velocity.setLocation(point); } void performTimeStep(double dt) { scaleAddAssign(velocity, dt, ACCELERATION); scaleAddAssign(position, dt, velocity); //System.out.println("Now at "+position+" with "+velocity); } private static void scaleAddAssign( Point2D result, double factor, Point2D addend) { double x = result.getX() + factor * addend.getX(); double y = result.getY() + factor * addend.getY(); result.setLocation(x, y); } } class ProjectileShooterPanel extends JPanel { private final ProjectileShooter projectileShooter; public ProjectileShooterPanel(ProjectileShooter projectileShooter) { this.projectileShooter = projectileShooter; } @Override protected void paintComponent(Graphics gr) { super.paintComponent(gr); Graphics2D g = (Graphics2D)gr; Projectile projectile = projectileShooter.getProjectile(); if (projectile != null) { g.setColor(Color.RED); Point2D position = projectile.getPosition(); int x = (int)position.getX(); int y = getHeight() - (int)position.getY(); g.fillOval(x-01, y-10, 20, 20); } } }

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