Added so that the ball is bouncing smoothly.

Jonathan / BallJumper

Browse code Added so that the ball is bouncing smoothly. The game is playable now. master
commit 20c1503c609ffd7cac4f30ee46fe855aa537b58a 2 parents cc56811 + 4e9c4e7 Jonathan Ström authored on 29 Jul 2017

Patch

Showing 3 changed files

Ignore Space Show notes View app/src/main/java/jonathan/balljumper/GameSurfaceView.java
package jonathan.balljumper; import android.app.Activity; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Point; import android.graphics.Rect; import android.view.MotionEvent; import android.view.SurfaceHolder; import android.view.SurfaceView; import jonathan.balljumper.classes.Ball; import jonathan.balljumper.classes.Panel; import jonathan.balljumper.classes.PanelHandler; /** * Created by Jonathan on 27/07/2017. / public class GameSurfaceView extends SurfaceView implements Runnable { private boolean isRunning = false; private Thread gameThread; private SurfaceHolder holder; private Point screenSize; private Ball ball; private PanelHandler panelHandler; private final static int MAX_FPS = 40; private final static int FRAME_PERIOD = 1000 / MAX_FPS; public GameSurfaceView(Context context) { super(context); // Get and set window size. screenSize = new Point(); ((Activity)getContext()).getWindowManager() .getDefaultDisplay() .getSize(screenSize); holder = getHolder(); holder.addCallback(new SurfaceHolder.Callback() { @Override public void surfaceCreated(SurfaceHolder holder) { } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { screenSize.x = width; screenSize.y = height; } @Override public void surfaceDestroyed(SurfaceHolder holder) { } }); // Initialize ball. int ballRadius = 35; ball = new Ball(screenSize.x / 2 - ballRadius, (screenSize.y / 3) 2 - ballRadius, ballRadius, 0.4f, Color.argb(255, 200, 34, 34)); ball.bounce(); // Initialize panelHandler. panelHandler = new PanelHandler(10, screenSize); } /** * Start or resume the game. / public void resume() { isRunning = true; gameThread = new Thread(this); gameThread.start(); } /* * Pause the game loop / public void pause() { isRunning = false; boolean retry = true; while (retry) { try { gameThread.join(); retry = false; } catch (InterruptedException e) { // Try shutting down the thread again. } } } /* * Updates each frame. / protected void update() { // Game mechanics / if (ball.getBottom() >= screenSize.y) { ball.bounce(); } else if (ball.getTop() <= 0) { ball.bounce(); } / if (ball.getBottom() >= screenSize.y) { pause(); } ball.setY((ball.getY() + ball.getSpeed() ball.getDirection().y) + ball.velocity); ball.velocity += ball.getResistance(); for (int i = 0; i < panelHandler.getPanelList().length; ++i) { Panel panel = panelHandler.getPanelList()[i]; // When ball moves upwards, move panels down. if (ball.getDirection().y == -1) { // If the panel is outside of the screen... if (panel.getY() + panel.getSpeed() > screenSize.y) { panelHandler.resetPanel(i); } else { // Move the panel down. panel.setY(panel.getY() + panel.getSpeed()); } } if (ball.intersects(panel.getX(), panel.getY(), panel.getWidth(), panel.getHeight())) { ball.bounce(); } } } /** * Render everything to the screen. * @param canvas Canvas to be used when rendering. / protected void render(Canvas canvas) { // Reset background canvas.drawColor(Color.GREEN); // Render ball ball.draw(canvas); // Render panels panelHandler.draw(canvas); } @Override public void run() { while(isRunning) { // Make sure the surface is ready if (! holder.getSurface().isValid()) { continue; } long started = System.currentTimeMillis(); // Update objects. update(); // Render objects to screen. Canvas canvas = holder.lockCanvas(); if (canvas != null) { render(canvas); holder.unlockCanvasAndPost(canvas); } // Make sure update, updates accordingly to the FPS. float deltaTime = (System.currentTimeMillis() - started); int sleepTime = (int) ((FRAME_PERIOD - deltaTime) / 2); if (sleepTime > 0) { try { gameThread.sleep(sleepTime); } catch (InterruptedException e) { } } while (sleepTime < 0) { update(); sleepTime += FRAME_PERIOD; } } } @Override public boolean onTouchEvent(MotionEvent event) { super.onTouchEvent(event); float x = event.getX(); float y = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_MOVE: ball.setX(x); break; } return true; } } package jonathan.balljumper; import android.app.Activity; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Point; import android.graphics.Rect; import android.view.MotionEvent; import android.view.SurfaceHolder; import android.view.SurfaceView; import jonathan.balljumper.classes.Ball; import jonathan.balljumper.classes.Panel; import jonathan.balljumper.classes.PanelHandler; /* * Created by Jonathan on 27/07/2017. / public class GameSurfaceView extends SurfaceView implements Runnable { private boolean isRunning = false; private Thread gameThread; private SurfaceHolder holder; private Point screenSize; private Ball ball; private PanelHandler panelHandler; private final static int MAX_FPS = 40; private final static int FRAME_PERIOD = 1000 / MAX_FPS; public GameSurfaceView(Context context) { super(context); // Get and set window size. screenSize = new Point(); ((Activity)getContext()).getWindowManager() .getDefaultDisplay() .getSize(screenSize); holder = getHolder(); holder.addCallback(new SurfaceHolder.Callback() { @Override public void surfaceCreated(SurfaceHolder holder) { } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { screenSize.x = width; screenSize.y = height; } @Override public void surfaceDestroyed(SurfaceHolder holder) { } }); // Initialize ball. int ballRadius = 35; ball = new Ball(screenSize.x / 2 - ballRadius, (screenSize.y / 3) 2 - ballRadius, ballRadius, Color.argb(255, 200, 34, 34)); // Initialize panelHandler. panelHandler = new PanelHandler(10, screenSize); } /** * Start or resume the game. / public void resume() { isRunning = true; gameThread = new Thread(this); gameThread.start(); } /* * Pause the game loop / public void pause() { isRunning = false; boolean retry = true; while (retry) { try { gameThread.join(); retry = false; } catch (InterruptedException e) { // Try shutting down the thread again. } } } /* * Updates each frame. / protected void update() { // Game mechanics if (ball.getBottom() >= screenSize.y) { ball.bounce(); } else if (ball.getTop() <= 0) { ball.bounce(); } ball.setY(ball.getY() + ball.getSpeed() ball.getDirection().y); for (int i = 0; i < panelHandler.getPanelList().length; ++i) { Panel panel = panelHandler.getPanelList()[i]; // When ball moves upwards, move panels down. if (ball.getDirection().y == -1) { // If the panel is outside of the screen... if (panel.getY() + panel.getSpeed() > screenSize.y) { panelHandler.resetPanel(i); } else { // Move the panel down. panel.setY(panel.getY() + panel.getSpeed()); } } else { if (ball.intersects(panel.getX(), panel.getY(), panel.getWidth(), panel.getHeight())) { ball.bounce(); } } } } /** * Render everything to the screen. * @param canvas Canvas to be used when rendering. */ protected void render(Canvas canvas) { // Reset background canvas.drawColor(Color.GREEN); // Render ball ball.draw(canvas); // Render panels panelHandler.draw(canvas); } @Override public void run() { while(isRunning) { // Make sure the surface is ready if (! holder.getSurface().isValid()) { continue; } long started = System.currentTimeMillis(); // Update objects. update(); // Render objects to screen. Canvas canvas = holder.lockCanvas(); if (canvas != null) { render(canvas); holder.unlockCanvasAndPost(canvas); } // Make sure update, updates accordingly to the FPS. float deltaTime = (System.currentTimeMillis() - started); int sleepTime = (int) ((FRAME_PERIOD - deltaTime) / 2); if (sleepTime > 0) { try { gameThread.sleep(sleepTime); } catch (InterruptedException e) { } } while (sleepTime < 0) { update(); sleepTime += FRAME_PERIOD; } } } @Override public boolean onTouchEvent(MotionEvent event) { super.onTouchEvent(event); float x = event.getX(); float y = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_MOVE: ball.setX(x); break; } return true; } }

Ignore Space Show notes View

app/src/main/java/jonathan/balljumper/GameSurfaceView.java

package jonathan.balljumper;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Point;
import android.graphics.Rect;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

import jonathan.balljumper.classes.Ball;
import jonathan.balljumper.classes.Panel;
import jonathan.balljumper.classes.PanelHandler;

/**
 * Created by Jonathan on 27/07/2017.
 */

public class GameSurfaceView extends SurfaceView implements Runnable {
    private boolean isRunning = false;
    private Thread gameThread;
    private SurfaceHolder holder;

private Point screenSize;

private Ball ball;
    private PanelHandler panelHandler;

private final static int MAX_FPS = 40;
    private final static int FRAME_PERIOD = 1000 / MAX_FPS;

public GameSurfaceView(Context context) {
        super(context);

// Get and set window size.
        screenSize = new Point();
        ((Activity)getContext()).getWindowManager()
                                .getDefaultDisplay()
                                .getSize(screenSize);

holder = getHolder();
        holder.addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder holder) {
            }

@Override
            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
                screenSize.x = width;
                screenSize.y = height;
            }

@Override
            public void surfaceDestroyed(SurfaceHolder holder) {
            }
        });

// Initialize ball.
        int ballRadius = 35;
        ball = new Ball(screenSize.x / 2 - ballRadius,
                       (screenSize.y / 3) * 2 - ballRadius,
                        ballRadius,
                        0.4f,
                        Color.argb(255, 200, 34, 34));

ball.bounce();

// Initialize panelHandler.
        panelHandler = new PanelHandler(10, screenSize);
    }

/**
     * Start or resume the game.
     */
    public void resume() {
        isRunning = true;
        gameThread = new Thread(this);
        gameThread.start();
    }

/**
     * Pause the game loop
     */
    public void pause() {
        isRunning = false;
        boolean retry = true;
        while (retry) {
            try {
                gameThread.join();
                retry = false;
            } catch (InterruptedException e) {
                // Try shutting down the thread again.
            }
        }
    }

/**
     * Updates each frame.
     */
    protected void update() {
        // Game mechanics
        /*
        if (ball.getBottom() >= screenSize.y) {
            ball.bounce();
        } else if (ball.getTop() <= 0) {
            ball.bounce();
        }
        */

if (ball.getBottom() >= screenSize.y) {
            pause();
        }

ball.setY((ball.getY() + ball.getSpeed() * ball.getDirection().y) + ball.velocity);

ball.velocity += ball.getResistance();

for (int i = 0; i < panelHandler.getPanelList().length; ++i) {
            Panel panel = panelHandler.getPanelList()[i];

// When ball moves upwards, move panels down.
            if (ball.getDirection().y == -1) {

// If the panel is outside of the screen...
                if (panel.getY() + panel.getSpeed() > screenSize.y) {
                    panelHandler.resetPanel(i);
                } else {
                    // Move the panel down.
                    panel.setY(panel.getY() + panel.getSpeed());
                }
            }
            if (ball.intersects(panel.getX(), panel.getY(), panel.getWidth(), panel.getHeight())) {
                ball.bounce();
            }

}
    }

/**
     * Render everything to the screen.
     * @param canvas Canvas to be used when rendering.
     */
    protected void render(Canvas canvas) {
        // Reset background
        canvas.drawColor(Color.GREEN);

// Render ball
        ball.draw(canvas);

// Render panels
        panelHandler.draw(canvas);
    }

@Override
    public void run() {
        while(isRunning) {
            // Make sure the surface is ready
            if (! holder.getSurface().isValid()) {
                continue;
            }
            long started = System.currentTimeMillis();

// Update objects.
            update();

// Render objects to screen.
            Canvas canvas = holder.lockCanvas();
            if (canvas != null) {
                render(canvas);
                holder.unlockCanvasAndPost(canvas);
            }

// Make sure update, updates accordingly to the FPS.
            float deltaTime = (System.currentTimeMillis() - started);
            int sleepTime = (int) ((FRAME_PERIOD - deltaTime) / 2);
            if (sleepTime > 0) {
                try {
                    gameThread.sleep(sleepTime);
                }
                catch (InterruptedException e) {
                }
            }
            while (sleepTime < 0) {
                update();
                sleepTime += FRAME_PERIOD;
            }
        }
    }

@Override
    public boolean onTouchEvent(MotionEvent event) {
        super.onTouchEvent(event);

float x = event.getX();
        float y = event.getY();

switch (event.getAction()) {
            case MotionEvent.ACTION_MOVE:
                ball.setX(x);
                break;
        }

return true;
    }
}

package jonathan.balljumper;

import jonathan.balljumper.classes.Ball;
import jonathan.balljumper.classes.Panel;
import jonathan.balljumper.classes.PanelHandler;

/**
 * Created by Jonathan on 27/07/2017.
 */

public class GameSurfaceView extends SurfaceView implements Runnable {
    private boolean isRunning = false;
    private Thread gameThread;
    private SurfaceHolder holder;

private Point screenSize;

private Ball ball;
    private PanelHandler panelHandler;

private final static int MAX_FPS = 40;
    private final static int FRAME_PERIOD = 1000 / MAX_FPS;

public GameSurfaceView(Context context) {
        super(context);

holder = getHolder();
        holder.addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder holder) {
            }

@Override
            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
                screenSize.x = width;
                screenSize.y = height;
            }

@Override
            public void surfaceDestroyed(SurfaceHolder holder) {
            }
        });

// Initialize ball.
        int ballRadius = 35;
        ball = new Ball(screenSize.x / 2 - ballRadius,
                       (screenSize.y / 3) * 2 - ballRadius,
                        ballRadius,
                        Color.argb(255, 200, 34, 34));

// Initialize panelHandler.
        panelHandler = new PanelHandler(10, screenSize);
    }

/**
     * Start or resume the game.
     */
    public void resume() {
        isRunning = true;
        gameThread = new Thread(this);
        gameThread.start();
    }

/**
     * Updates each frame.
     */
    protected void update() {
        // Game mechanics
        if (ball.getBottom() >= screenSize.y) {
            ball.bounce();
        } else if (ball.getTop() <= 0) {
            ball.bounce();
        }

ball.setY(ball.getY() + ball.getSpeed() * ball.getDirection().y);

for (int i = 0; i < panelHandler.getPanelList().length; ++i) {
            Panel panel = panelHandler.getPanelList()[i];

// When ball moves upwards, move panels down.
            if (ball.getDirection().y == -1) {

// If the panel is outside of the screen...
                if (panel.getY() + panel.getSpeed() > screenSize.y) {
                    panelHandler.resetPanel(i);
                } else {
                    // Move the panel down.
                    panel.setY(panel.getY() + panel.getSpeed());
                }
            } else {
                if (ball.intersects(panel.getX(), panel.getY(), panel.getWidth(), panel.getHeight())) {
                    ball.bounce();
                }
            }
        }
    }

// Render ball
        ball.draw(canvas);

// Render panels
        panelHandler.draw(canvas);
    }

// Update objects.
            update();

@Override
    public boolean onTouchEvent(MotionEvent event) {
        super.onTouchEvent(event);

float x = event.getX();
        float y = event.getY();

switch (event.getAction()) {
            case MotionEvent.ACTION_MOVE:
                ball.setX(x);
                break;
        }

return true;
    }
}

Ignore Space Show notes View app/src/main/java/jonathan/balljumper/classes/Ball.java
package jonathan.balljumper.classes; import android.graphics.Canvas; import android.graphics.ColorFilter; import android.graphics.LightingColorFilter; import android.graphics.Paint; /** * Created by Jonathan on 27/07/2017. / public class Ball extends Sprite { private float radius; private float resistance; public float velocity; public Ball(float x, float y, float radius, float resistance, int color) { super(x, y, radius 2, radius * 2); this.radius = radius; this.resistance = resistance; this.velocity = -.3f; setColor(color); setSpeed(17f); } public void draw(Canvas canvas) { Paint p = new Paint(); ColorFilter filter = new LightingColorFilter(getColor(), 0); p.setColorFilter(filter); p.setColor(getColor()); canvas.drawCircle(getX(), getY(), getRadius(), p); } public void bounce() { // Simple bounce. getDirection().y = -1; y-=speed; velocity = -.3f; } public boolean intersects(float x, float y, float w, float h) { return x < this.getLeft() + this.width && x + w > this.getLeft() && y < this.getTop() + this.height && y + h > this.getTop(); } public float getRadius() { return radius; } public void setRadius(float radius) { this.radius = radius; } public float getResistance() { return resistance; } public void setResistance(float resistance) { this.resistance = resistance; } @Override public float getTop() { return y - radius; } @Override public float getBottom() { return y + radius; } @Override public float getLeft() { return x - radius; } @Override public float getRight() { return x + radius; } } package jonathan.balljumper.classes; import android.graphics.Canvas; import android.graphics.ColorFilter; import android.graphics.LightingColorFilter; import android.graphics.Paint; /* * Created by Jonathan on 27/07/2017. / public class Ball extends Sprite { private float radius; public Ball(float x, float y, float radius, int color) { super(x, y, radius 2, radius * 2); this.radius = radius; setColor(color); setSpeed(10f); } public void draw(Canvas canvas) { Paint p = new Paint(); ColorFilter filter = new LightingColorFilter(getColor(), 0); p.setColorFilter(filter); p.setColor(getColor()); canvas.drawCircle(getX(), getY(), getRadius(), p); } public void bounce() { // Simple bounce. getDirection().y *= -1; } public boolean intersects(float x, float y, float w, float h) { return x < this.getLeft() + this.width && x + w > this.getLeft() && y < this.getTop() + this.height && y + h > this.getTop(); } public float getRadius() { return radius; } public void setRadius(float radius) { this.radius = radius; } @Override public float getTop() { return y - radius; } @Override public float getBottom() { return y + radius; } @Override public float getLeft() { return x - radius; } @Override public float getRight() { return x + radius; } }

Ignore Space Show notes View

app/src/main/java/jonathan/balljumper/classes/Ball.java

package jonathan.balljumper.classes;

import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.LightingColorFilter;
import android.graphics.Paint;

/**
 * Created by Jonathan on 27/07/2017.
 */

public class Ball extends Sprite {
    private float radius;
    private float resistance;
    public float velocity;

public Ball(float x, float y, float radius, float resistance, int color) {
        super(x, y, radius * 2, radius * 2);
        this.radius = radius;
        this.resistance = resistance;
        this.velocity = -.3f;
        setColor(color);
        setSpeed(17f);
    }

public void draw(Canvas canvas) {
        Paint p = new Paint();
        ColorFilter filter = new LightingColorFilter(getColor(), 0);
        p.setColorFilter(filter);
        p.setColor(getColor());
        canvas.drawCircle(getX(), getY(), getRadius(), p);
    }

public void bounce() {
        // Simple bounce.
        getDirection().y *= -1;
        y-=speed;
        velocity = -.3f;
    }

public boolean intersects(float x, float y, float w, float h) {
        return x < this.getLeft() + this.width &&
                x + w > this.getLeft() &&
                y < this.getTop() + this.height &&
                y + h > this.getTop();
    }

public float getRadius() {
        return radius;
    }

public void setRadius(float radius) {
        this.radius = radius;
    }

public float getResistance() {
        return resistance;
    }

public void setResistance(float resistance) {
        this.resistance = resistance;
    }

@Override
    public float getTop() {
        return y - radius;
    }

@Override
    public float getBottom() {
        return y + radius;
    }

@Override
    public float getLeft() {
        return x - radius;
    }

@Override
    public float getRight() {
        return x + radius;
    }
}

package jonathan.balljumper.classes;

import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.LightingColorFilter;
import android.graphics.Paint;

/**
 * Created by Jonathan on 27/07/2017.
 */

public class Ball extends Sprite {
    private float radius;

public Ball(float x, float y, float radius, int color) {
        super(x, y, radius * 2, radius * 2);
        this.radius = radius;
        setColor(color);
        setSpeed(10f);
    }

public void bounce() {
        // Simple bounce.
        getDirection().y *= -1;
    }

public float getRadius() {
        return radius;
    }

public void setRadius(float radius) {
        this.radius = radius;
    }

@Override
    public float getTop() {
        return y - radius;
    }

@Override
    public float getBottom() {
        return y + radius;
    }

@Override
    public float getLeft() {
        return x - radius;
    }

@Override
    public float getRight() {
        return x + radius;
    }
}

Ignore Space Show notes View app/src/main/java/jonathan/balljumper/classes/PanelHandler.java
package jonathan.balljumper.classes; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Point; import java.util.Random; /** * Created by Jonathan on 29/07/2017. / public class PanelHandler { private final int panelFirstPosition = 1500; // Y-position (pixel) of the first panel. private int panelCount; private Point screenSize; private Random random; private Panel[] panelList; private int lastPanelIndex = -1; public PanelHandler(int panelCount, Point screenSize) { this.panelCount = panelCount; this.screenSize = screenSize; random = new Random(); // Initialize all panels. panelList = new Panel[panelCount]; Random random = new Random(); int panelWidth = 150; for (int i = 0; i < panelList.length; ++i) { panelList[i] = new Panel( random.nextInt(screenSize.x - panelWidth), getNewPanelHeight(lastPanelIndex), panelWidth, 30, Color.GRAY); lastPanelIndex = i; } } public void resetPanel(int index) { panelList[index].setY(getNewPanelHeight(lastPanelIndex)); lastPanelIndex = index; } private float getNewPanelHeight(int index) { float newPanelHeight; if (index == -1) { newPanelHeight = panelFirstPosition; } else { newPanelHeight = panelList[index].getY() - (random.nextInt(screenSize.y / 5) + 250); } return newPanelHeight; } public Panel[] getPanelList() { return panelList; } public void draw(Canvas canvas) { for (Panel panel : panelList) { Paint pPanel = new Paint(); pPanel.setColor(panel.getColor()); canvas.drawRect(panel.getX(), panel.getY(), panel.getWidth() + panel.getX(), panel.getHeight() + panel.getY(), pPanel); } } } package jonathan.balljumper.classes; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Point; import java.util.Random; /* * Created by Jonathan on 29/07/2017. */ public class PanelHandler { private final int panelFirstPosition = 400; // Y-position (pixel) of the first panel. private int panelCount; private Point screenSize; private Random random; private Panel[] panelList; private int lastPanelIndex = -1; public PanelHandler(int panelCount, Point screenSize) { this.panelCount = panelCount; this.screenSize = screenSize; random = new Random(); // Initialize all panels. panelList = new Panel[panelCount]; Random random = new Random(); int panelWidth = 150; for (int i = 0; i < panelList.length; ++i) { panelList[i] = new Panel( random.nextInt(screenSize.x - panelWidth), getNewPanelHeight(lastPanelIndex), panelWidth, 30, Color.GRAY); lastPanelIndex = i; } } public void resetPanel(int index) { panelList[index].setY(getNewPanelHeight(lastPanelIndex)); lastPanelIndex = index; } private float getNewPanelHeight(int index) { float newPanelHeight; if (index == -1) { newPanelHeight = panelFirstPosition; } else { newPanelHeight = panelList[index].getY() - (random.nextInt(screenSize.y / 5) + 250); } return newPanelHeight; } public Panel[] getPanelList() { return panelList; } public void draw(Canvas canvas) { for (Panel panel : panelList) { Paint pPanel = new Paint(); pPanel.setColor(panel.getColor()); canvas.drawRect(panel.getX(), panel.getY(), panel.getWidth() + panel.getX(), panel.getHeight() + panel.getY(), pPanel); } } }

Ignore Space Show notes View

app/src/main/java/jonathan/balljumper/classes/PanelHandler.java

package jonathan.balljumper.classes;

import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;

import java.util.Random;

/**
 * Created by Jonathan on 29/07/2017.
 */

public class PanelHandler {
    private final int panelFirstPosition = 1500; // Y-position (pixel) of the first panel.

private int panelCount;
    private Point screenSize;
    private Random random;

private Panel[] panelList;
    private int lastPanelIndex = -1;

public PanelHandler(int panelCount, Point screenSize) {
        this.panelCount = panelCount;
        this.screenSize = screenSize;

random = new Random();

// Initialize all panels.
        panelList = new Panel[panelCount];

Random random = new Random();

int panelWidth = 150;
        for (int i = 0; i < panelList.length; ++i) {
            panelList[i] = new Panel(
                    random.nextInt(screenSize.x - panelWidth),
                    getNewPanelHeight(lastPanelIndex),
                    panelWidth,
                    30,
                    Color.GRAY);
            lastPanelIndex = i;
        }
    }

public void resetPanel(int index) {
        panelList[index].setY(getNewPanelHeight(lastPanelIndex));

lastPanelIndex = index;
    }

private float getNewPanelHeight(int index) {
        float newPanelHeight;
        if (index == -1) {
            newPanelHeight = panelFirstPosition;
        } else {
            newPanelHeight = panelList[index].getY() - (random.nextInt(screenSize.y / 5) + 250);
        }

return newPanelHeight;
    }

public Panel[] getPanelList() {
        return panelList;
    }

public void draw(Canvas canvas) {
        for (Panel panel : panelList) {
            Paint pPanel = new Paint();
            pPanel.setColor(panel.getColor());
            canvas.drawRect(panel.getX(), panel.getY(), panel.getWidth() + panel.getX(), panel.getHeight() + panel.getY(), pPanel);
        }
    }
}

package jonathan.balljumper.classes;

import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;

import java.util.Random;

/**
 * Created by Jonathan on 29/07/2017.
 */

public class PanelHandler {
    private final int panelFirstPosition = 400; // Y-position (pixel) of the first panel.

private int panelCount;
    private Point screenSize;
    private Random random;

private Panel[] panelList;
    private int lastPanelIndex = -1;

public PanelHandler(int panelCount, Point screenSize) {
        this.panelCount = panelCount;
        this.screenSize = screenSize;

random = new Random();

// Initialize all panels.
        panelList = new Panel[panelCount];

Random random = new Random();

public void resetPanel(int index) {
        panelList[index].setY(getNewPanelHeight(lastPanelIndex));

lastPanelIndex = index;
    }

return newPanelHeight;
    }

public Panel[] getPanelList() {
        return panelList;
    }

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