Hi !
Featured games (85)
games approved by the League of Dukes
Games in Showcase (623)
Games in Android Showcase (176)
games submitted by our members
Games in WIP (676)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  Adding a trailer behind a missile  (Read 1683 times)
0 Members and 1 Guest are viewing this topic.
Offline P0jahn

Senior Devvie

Medals: 1
Projects: 3

« Posted 2013-01-06 21:45:02 »

I know how to add a trailer behind a missile, but I am having trouble getting the right coordinates, the trailer is a bit off.
So, first, I rotate the image so it is facing the target and render it:

float rotation = (float) getAngle(x, y, targetX, targetY);
g.rotate(x, y, rotation + 90);
g.drawImage(missile, x, y);

Then, I try to render the trailer behind the missile like this:

if(trailer != null)
   g.rotate(x, y + realHeight, rotation + 90);
   stage.append(trailer.getClone(x, y + realHeight));

And finally, I make the rotation normal:
g.rotate(0, 0, 0);

Obviously this doesn't work.
Any one have any idea?
Offline ReBirth
« Reply #1 - Posted 2013-01-07 02:30:21 »

What do you mean not work? they're not or wrong rotated?

Offline P0jahn

Senior Devvie

Medals: 1
Projects: 3

« Reply #2 - Posted 2013-01-07 03:24:31 »

the trailer is a bit off.
Also, the rotation is insignificant. It the position(i e behind the rocket) that is important.
Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Offline Vladiedoo
« Reply #3 - Posted 2013-01-07 03:26:40 »

Providing images of the issue should make it much easier to de-bug.
Offline theagentd

« JGO Bitwise Duke »

Medals: 564
Projects: 4
Exp: 8 years

« Reply #4 - Posted 2013-01-07 06:24:37 »

You're rotating around the top left corners of your images.

Offline P0jahn

Senior Devvie

Medals: 1
Projects: 3

« Reply #5 - Posted 2013-01-07 17:16:19 »

The green thing is the target.

Online ra4king

JGO Kernel

Medals: 404
Projects: 3
Exp: 5 years

I'm the King!

« Reply #6 - Posted 2013-01-08 01:13:09 »

So what exactly is the problem? What is that green marker thing?

Offline P0jahn

Senior Devvie

Medals: 1
Projects: 3

« Reply #7 - Posted 2013-01-08 01:22:45 »

ra4king: That lime-green circle is the target. The other dark-greyed-green-line is the smoke, which is incorrectly placed.
But never mind that. I solved it, but a new problem occurred.

I see the problem. This line:
stage.append(trailer.getClone(x, y + realHeight));
This just adds the trailer to the game, it does not render it. That happens later, when the rotation is restored to normal.

So I thought, I use g.renderAnimation instead of stage.append, so I can render it on the method where the rotation is taking place. The trailer is just an graphical effect anyway, with no properties.
I quickly succeed to get the trailer where I wanted.
However, I am getting erroneous results with drawAnimation(org.newdawn.slick.Animation).
It seems like multiple animations that use the very same Image object can not be present at the same time.
Even if I am calling drawAnimation every frame, only one animation is seeable. That is not the only problem, the graphic context is not rendering all frames in the animation. Yepp, for some reason, it is skipping some frames, making it look like it is blinking.
Can anyone explain this?
Pages: [1]
  ignore  |  Print  
You cannot reply to this message, because it is very, very old.

BurntPizza (23 views)
2015-10-07 02:11:23

KaiHH (23 views)
2015-10-06 20:22:20

KaiHH (11 views)
2015-10-06 19:41:59

BurntPizza (25 views)
2015-10-06 19:04:48

basil_ (44 views)
2015-09-30 17:04:40

shadowstryker (22 views)
2015-09-29 15:55:06

TheSpaceHedgehog (28 views)
2015-09-29 01:58:48

GamerC4 (54 views)
2015-09-24 21:10:38

GamerC4 (71 views)
2015-09-24 21:09:48

htuy (28 views)
2015-09-24 04:57:24
Math: Inequality properties
by Roquen
2015-10-01 13:30:46

Math: Inequality properties
by Roquen
2015-09-30 16:06:05

HotSpot Options
by Roquen
2015-08-29 11:33:11

Rendering resources
by Roquen
2015-08-17 12:42:29

Rendering resources
by Roquen
2015-08-17 09:36:56

Rendering resources
by Roquen
2015-08-13 07:40:51

Networking Resources
by Roquen
2015-08-13 07:40:43

List of Learning Resources
by gouessej
2015-07-09 11:29:36 is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!