• Announcements

    • khawk

      Download the Game Design and Indie Game Marketing Freebook   07/19/17

      GameDev.net and CRC Press have teamed up to bring a free ebook of content curated from top titles published by CRC Press. The freebook, Practices of Game Design & Indie Game Marketing, includes chapters from The Art of Game Design: A Book of Lenses, A Practical Guide to Indie Game Marketing, and An Architectural Approach to Level Design. The GameDev.net FreeBook is relevant to game designers, developers, and those interested in learning more about the challenges in game development. We know game development can be a tough discipline and business, so we picked several chapters from CRC Press titles that we thought would be of interest to you, the GameDev.net audience, in your journey to design, develop, and market your next game. The free ebook is available through CRC Press by clicking here. The Curated Books The Art of Game Design: A Book of Lenses, Second Edition, by Jesse Schell Presents 100+ sets of questions, or different lenses, for viewing a game’s design, encompassing diverse fields such as psychology, architecture, music, film, software engineering, theme park design, mathematics, anthropology, and more. Written by one of the world's top game designers, this book describes the deepest and most fundamental principles of game design, demonstrating how tactics used in board, card, and athletic games also work in video games. It provides practical instruction on creating world-class games that will be played again and again. View it here. A Practical Guide to Indie Game Marketing, by Joel Dreskin Marketing is an essential but too frequently overlooked or minimized component of the release plan for indie games. A Practical Guide to Indie Game Marketing provides you with the tools needed to build visibility and sell your indie games. With special focus on those developers with small budgets and limited staff and resources, this book is packed with tangible recommendations and techniques that you can put to use immediately. As a seasoned professional of the indie game arena, author Joel Dreskin gives you insight into practical, real-world experiences of marketing numerous successful games and also provides stories of the failures. View it here. An Architectural Approach to Level Design This is one of the first books to integrate architectural and spatial design theory with the field of level design. The book presents architectural techniques and theories for level designers to use in their own work. It connects architecture and level design in different ways that address the practical elements of how designers construct space and the experiential elements of how and why humans interact with this space. Throughout the text, readers learn skills for spatial layout, evoking emotion through gamespaces, and creating better levels through architectural theory. View it here. Learn more and download the ebook by clicking here. Did you know? GameDev.net and CRC Press also recently teamed up to bring GDNet+ Members up to a 20% discount on all CRC Press books. Learn more about this and other benefits here.
Sign in to follow this  
Followers 0
Nicholas Kong

Projectile moves according to ship moves even when shot

2 posts in this topic

I am working on making a Top-Down Shooter Clone in Java. After an hour or so, I was able to figure how to position the ship's projectile which is a laser relative to the direction of the ship's sprite. Problem is, if I move the ship, the projectile follows relative to the ship direction when I move the ship. As you can see this is a problem because the laser should be moving independently regardless of where the ship is when it is fired.

 

Here's the code which presents my problem:

 

gameProblem1_zpsb4ee2df9.png

 

 

Here's the picture mainly to prove I have a working game(the ship can move with left and right arrows keys and fire a projectile with z button!):

gameProblem_zps60f87d95.png

 

 

 
Edited by warnexus
0

Share this post


Link to post
Share on other sites

Your laser coordinates should not be set to anything initially.  Once you press the fire button, you then assign the X and Y location of the laser to where the nose of the ship is.  Then, every loop through, you simply increment the Y location based on a velocity.  There is no need to keep setting the X location relative to the ship after it has been fired.

 

Also, you will want to store a list of lasers, assuming you can have mroe than 1 laser on screen at a time, and you'll do the same thing, except loop through the lasers every frame, check if it hits something, or if it's gone off the screen, and remove it from the list if so.

 

Good luck!

0

Share this post


Link to post
Share on other sites
Your laser coordinates should not be set to anything initially.  Once you press the fire button, you then assign the X and Y location of the laser to where the nose of the ship is.  Then, every loop through, you simply increment the Y location based on a velocity.  There is no need to keep setting the X location relative to the ship after it has been fired.

 

Also, you will want to store a list of lasers, assuming you can have mroe than 1 laser on screen at a time, and you'll do the same thing, except loop through the lasers every frame, check if it hits something, or if it's gone off the screen, and remove it from the list if so.

 

Good luck!

Initially I wanted to do a while loop through to decrease the laser_dx so the laser can move up but the paintComponent in Java is like a loop in itself. So if I chosen to do a while loop, I would actually get an infinite loop.

 

Thanks for the suggestion for more than one laser. I am going to take your feedback and come up with the solution right now. Thanks for the reply! =]

 

 

On a side note, Nice AttackAndDefend Video on youtube. I like the collision detection and lighting! 

Edited by warnexus
0

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0