Uploaded homecoming project

Author: chen-robert

Diff for: src/homecoming/GamePanel.java

@@ -0,0 +1,94 @@
+package homecoming;
+
+import java.awt.Color;
+import java.awt.Font;
+import java.awt.FontMetrics;
+import java.awt.Graphics;
+import java.awt.Image;
+import java.awt.Rectangle;
+import java.awt.Toolkit;
+import java.awt.image.BufferedImage;
+import java.awt.image.FilteredImageSource;
+import java.awt.image.ImageFilter;
+import java.awt.image.ImageProducer;
+import java.awt.image.RGBImageFilter;
+import java.io.File;
+import java.io.IOException;
+
+import javax.imageio.ImageIO;
+import javax.swing.JPanel;
+
+public class GamePanel extends JPanel {
+	static {
+		BufferedImage img = null;
+		BufferedImage background = null;
+		try {
+			img = ImageIO.read(new File("download.png"));
+			background = ImageIO.read(new File("download.jpg"));
+		} catch (IOException ioe) {
+			System.err.println("Fatal error: Failed to load images");
+			System.exit(1);
+		}
+		backgroundImg = background;
+		heartImg = makeColorTransparent(img, Color.WHITE);
+	}
+	static final Image heartImg;
+	static final Image backgroundImg;
+	static final Font font = new Font("Courier", Font.BOLD, 30);
+
+	@Override
+	public void paintComponent(Graphics g) {
+		g.setColor(Color.WHITE);
+		g.fillRect(0, 0, getWidth(), getHeight());
+
+		g.drawImage(backgroundImg, 0, 0, getWidth(), getHeight(), null);
+
+
+		g.setColor(Color.WHITE);
+		g.setFont(font);
+		drawCenteredString(g, String.format(Main.GREETING, Main.NAME), new Rectangle(0, 0, getWidth(), getHeight()),
+				font);
+		
+		for (Heart heart : Main.state.getHearts()) {
+			g.drawImage(heartImg, heart.pos.x, heart.pos.y, GameState.FALLING_HEART_SIZE, GameState.FALLING_HEART_SIZE,
+					null);
+		}
+	}
+
+	// Copied from
+	// https://stackoverflow.com/questions/27706197/how-can-i-center-graphics-drawstring-in-java
+	public void drawCenteredString(Graphics g, String text, Rectangle rect, Font font) {
+		// Get the FontMetrics
+		FontMetrics metrics = g.getFontMetrics(font);
+		// Determine the X coordinate for the text
+		int x = rect.x + (rect.width - metrics.stringWidth(text)) / 2;
+		// Determine the Y coordinate for the text (note we add the ascent, as in java
+		// 2d 0 is top of the screen)
+		int y = rect.y + ((rect.height - metrics.getHeight()) / 2) + metrics.getAscent();
+		// Set the font
+		g.setFont(font);
+		// Draw the String
+		g.drawString(text, x, y);
+	}
+
+	// Copied from https://www.javaworld.com/article/2074105/making-white-image-backgrounds-transparent-with-java-2d-groovy.html
+	public static Image makeColorTransparent(final BufferedImage im, final Color color) {
+		final ImageFilter filter = new RGBImageFilter() {
+			// the color we are looking for (white)... Alpha bits are set to opaque
+			public int markerRGB = color.getRGB() | 0xFFFFFFFF;
+
+			public final int filterRGB(final int x, final int y, final int rgb) {
+				if ((rgb | 0xFF000000) == markerRGB) {
+					// Mark the alpha bits as zero - transparent
+					return 0x00FFFFFF & rgb;
+				} else {
+					// nothing to do
+					return rgb;
+				}
+			}
+		};
+
+		final ImageProducer ip = new FilteredImageSource(im.getSource(), filter);
+		return Toolkit.getDefaultToolkit().createImage(ip);
+	}
+}

Diff for: src/homecoming/GameState.java

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+package homecoming;
+
+import java.awt.Point;
+import java.util.ArrayList;
+
+public class GameState {
+	static final int FALLING_HEART_SIZE = 50;
+	
+	static final int SPEED = 5;
+	static final int SPACING = 10;
+
+	private ArrayList<Heart> hearts;
+	private int counter;
+
+	public GameState() {
+		hearts = new ArrayList<>();
+	}
+
+	public void update() {
+		counter++;
+		if(counter % 25 == 0) {			
+			Point pos = new Point((int) (500 * Math.random()), 0);
+			int speed = (int) (4 * Math.random()) + 2;
+			hearts.add(new Heart(pos, speed));
+		}
+
+		for (Heart heart : hearts) {
+			heart.pos.y += heart.speed;
+		}
+
+	}
+
+	public ArrayList<Heart> getHearts() {
+		return hearts;
+	}
+
+}

Diff for: src/homecoming/Heart.java

@@ -0,0 +1,13 @@
+package homecoming;
+
+import java.awt.Point;
+
+public class Heart {
+	public final Point pos;
+	public final int speed;
+	
+	public Heart(Point p, int speed) {
+		pos = p;
+		this.speed = speed;
+	}
+}

Diff for: src/homecoming/Main.java

@@ -0,0 +1,36 @@
+package homecoming;
+
+import java.awt.Dimension;
+
+import javax.swing.JFrame;
+
+public class Main {
+	static final String NAME = "Alex";
+	static final String GREETING = "Homecoming %s?";
+	
+	static final GameState state = new GameState();
+	public static void main(String args[]) throws InterruptedException {
+		JFrame frame = new JFrame("Homecoming?");
+
+		GamePanel game = new GamePanel();
+		frame.add(game);
+
+		frame.setPreferredSize(new Dimension(500, 500));
+		frame.pack();
+
+		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		frame.setResizable(false);
+
+		frame.setVisible(true);
+
+		while (true) {
+			long startTime = System.currentTimeMillis();
+
+			state.update();
+			frame.repaint();
+
+			long elapsedTime = System.currentTimeMillis() - startTime;
+			Thread.sleep(Math.max(0, 1000 / 30 - elapsedTime));
+		}
+	}
+}