Домашняя работа #1

BackGround.java

@@ -0,0 +1,27 @@
+package ru.gb.jtwo.online.circles;
+
+import java.awt.*;
+
+public class BackGround {
+
+    private int changeSpeed;
+    private int counter;
+
+    BackGround(int updateTime){
+        this.changeSpeed = updateTime;
+    }
+
+    void update(GameCanvas canvas){
+        counter++;
+
+        if ((counter % changeSpeed) == 0) {
+            Color color = new Color(
+                    (int)(Math.random() * 255),
+                    (int)(Math.random() * 255),
+                    (int)(Math.random() * 255)
+            );
+            canvas.setBackground(color);
+        }
+
+    }
+}

Ball.java

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+package ru.gb.jtwo.online.circles;
+
+import java.awt.*;
+
+public class Ball extends Sprite {
+    private float vx = 150 + (float)(Math.random() * 200f);
+    private float vy = 150 + (float)(Math.random() * 200f);
+    private final Color color = new Color(
+            (int)(Math.random() * 255),
+            (int)(Math.random() * 255),
+            (int)(Math.random() * 255)
+    );
+
+    Ball() {
+        halfHeight = 20 + (float)(Math.random() * 50f);
+        halfWidth = halfHeight;
+    }
+
+    @Override
+    void update(GameCanvas canvas, float deltaTime) {
+        x += vx * deltaTime;
+        y += vy * deltaTime;
+        if (getLeft() < canvas.getLeft()) {
+            setLeft(canvas.getLeft());
+            vx = -vx;
+        }
+        if (getRight() > canvas.getRight()) {
+            setRight(canvas.getRight());
+            vx = -vx;
+        }
+        if (getTop() < canvas.getTop()) {
+            setTop(canvas.getTop());
+            vy = -vy;
+        }
+        if (getBottom() > canvas.getBottom()) {
+            setBottom(canvas.getBottom());
+            vy = -vy;
+        }
+    }
+
+    @Override
+    void render(GameCanvas canvas, Graphics g) {
+        g.setColor(color);
+        g.fillOval((int) getLeft(), (int) getTop(),
+                (int) getWidth(), (int) getHeight());
+    }
+}

GameCanvas.java

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+package ru.gb.jtwo.online.circles;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+
+public class GameCanvas extends JPanel {
+
+    private MainCircles gameWindow;
+    private long lastFrameTime;
+
+
+
+    GameCanvas(MainCircles gameWindow) {
+        this.gameWindow = gameWindow;
+        addMouseListener(new MouseController(this));
+    }
+
+    @Override
+    protected void paintComponent(Graphics g) {
+        super.paintComponent(g);
+
+        long currentTime = System.nanoTime();
+        float delta = (currentTime - lastFrameTime) * 0.000000001f;
+        lastFrameTime = currentTime;
+
+        try {
+            Thread.sleep(17);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+
+        gameWindow.onDrawPanel(this, g, delta);
+        repaint();
+    }
+
+    public int getLeft() { return 0; }
+    public int getRight() { return getWidth() - 1; }
+    public int getTop() { return 0; }
+    public int getBottom() { return getHeight() - 1; }
+    public MainCircles getGameWindow(){return gameWindow;};
+
+}

MainCircles.java

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+package ru.gb.jtwo.online.circles;
+
+import javax.swing.*;
+import java.awt.*;
+import java.lang.reflect.Array;
+
+public class MainCircles extends JFrame {
+    /*
+    Полностью разобраться с кодом
+	Прочитать методичку к следующему уроку
+	Написать класс Бэкграунд, изменяющий цвет канвы в зависимости от времени
+	 * Реализовать добавление новых кружков по клику используя ТОЛЬКО массивы
+	 ** Реализовать по клику другой кнопки удаление кружков (никаких эррейЛист)
+    * */
+
+    private static final int POS_X = 600;
+    private static final int POS_Y = 200;
+    private static final int WINDOW_WIDTH = 800;
+    private static final int WINDOW_HEIGHT = 600;
+    Sprite[] sprites = new Sprite[10];
+    BackGround backGround = new BackGround(100);
+
+    public static void main(String[] args) {
+        SwingUtilities.invokeLater(new Runnable() {
+            @Override
+            public void run() {
+                new MainCircles();
+            }
+        });
+    }
+
+    private MainCircles() {
+        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
+        setBounds(POS_X, POS_Y, WINDOW_WIDTH, WINDOW_HEIGHT);
+        setTitle("Circles");
+
+        GameCanvas gameCanvas = new GameCanvas(this);
+        add(gameCanvas);
+        initGame();
+        setVisible(true);
+    }
+
+    private void initGame() {
+        for (int i = 0; i < sprites.length; i++) {
+            sprites[i] = new Ball();
+        }
+    }
+
+    void onDrawPanel(GameCanvas canvas, Graphics g, float deltaTime) {
+        update(canvas, deltaTime);
+        render(canvas, g);
+    }
+
+    private void update(GameCanvas canvas, float deltaTime) {
+        for (int i = 0; i < sprites.length; i++) {
+            sprites[i].update(canvas, deltaTime);
+        }
+
+        //Обновление фона
+        backGround.update(canvas);
+    }
+
+    private void render(GameCanvas canvas, Graphics g) {
+        for (int i = 0; i < sprites.length; i++) {
+            sprites[i].render(canvas, g);
+        }
+
+    }
+
+    //Удаление шарика из массива
+    protected void deleteSprite(){
+        if (sprites.length > 0) {
+            Sprite[] newSptites = new Sprite[sprites.length - 1];
+            System.arraycopy(sprites, 0, newSptites, 0, sprites.length - 1);
+            sprites = newSptites;
+        }
+    }
+
+    //Добавление шарика
+    protected void addSprite(){
+        Sprite[] newSprites = new Sprite[sprites.length + 1];
+        System.arraycopy(sprites, 0, newSprites, 0, sprites.length);
+        newSprites[sprites.length] = new Ball();
+        sprites = newSprites;
+    }
+}

MouseController.java

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+package ru.gb.jtwo.online.circles;
+
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+
+public class MouseController extends MouseAdapter {
+    GameCanvas canvas;
+
+    public MouseController(GameCanvas canvas) {
+        super();
+        this.canvas = canvas;
+    }
+    @Override
+    public void mouseClicked(MouseEvent e) {
+        super.mouseClicked(e);
+
+        if (e.getButton() == MouseEvent.BUTTON1)
+        {
+            canvas.getGameWindow().addSprite();
+        }
+
+        if (e.getButton() == MouseEvent.BUTTON3)
+        {
+            canvas.getGameWindow().deleteSprite();
+        }
+
+    }
+
+
+}

Sprite.java

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+package ru.gb.jtwo.online.circles;
+
+import java.awt.*;
+
+public class Sprite {
+    protected float x;
+    protected float y;
+    protected float halfWidth;
+    protected float halfHeight;
+
+    protected float getLeft() {
+        return x - halfWidth;
+    }
+    protected void setLeft(float left) {
+        x = left + halfWidth;
+    }
+    protected float getRight() {
+        return x + halfWidth;
+    }
+    protected void setRight(float right) {
+        x = right - halfWidth;
+    }
+    protected float getTop() {
+        return y - halfHeight;
+    }
+    protected void setTop(float top) {
+        y = top + halfHeight;
+    }
+    protected float getBottom() {
+        return y + halfHeight;
+    }
+    protected void setBottom(float bottom) {
+        y = bottom - halfHeight;
+    }
+    protected float getWidth() {
+        return 2f * halfWidth;
+    }
+    protected float getHeight() {
+        return 2f * halfHeight;
+    }
+
+    void update(GameCanvas canvas, float deltaTime) {}
+    void render(GameCanvas canvas, Graphics g) {}
+
+}