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  paintComponent() good standars' programming  (Read 543 times)
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Offline Beppe

Junior Duke





« Posted 2013-08-21 09:02:29 »

Hi ,
This is my question , for example I would create a game , and would paint when I win a match a screen with "You win" , generally I, for do this, use a boolean variable in paintComponent method :
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public void paintComponent(Graphics g){
      if(game_is_running) // paint the game state
      else // paint the screen with the string "you have win "

With this approach all work , but I've read on web that into paintComponent must not use boolean variable  because paintComponent must paint only the game state.... So I don't know how...
Offline Herjan
« Reply #1 - Posted 2013-08-21 09:35:24 »

What is the problem Huh It works  Grin

Offline KevinWorkman

JGO Wizard


Medals: 85
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klaatu barada nikto


« Reply #2 - Posted 2013-08-21 15:24:36 »

It's true that your painting code should not include any "business logic". The idea is to separate your game's logic from painting the game, that way you can easily change it later- for example if you wanted to go from 2D to 3D.

That doesn't mean you can't have any if statements or for loops in your painting code.

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Offline Several Kilo-Bytes

Senior Duke


Medals: 11



« Reply #3 - Posted 2013-08-21 16:46:46 »

With this approach all work , but I've read on web that into paintComponent must not use boolean variable  because paintComponent must paint only the game state.... So I don't know how...

The game state includes boolean variables like whether the game is over. The advice you received is bad advice anyways because it rules out settings that change the GUI. (showFps, showMiniMap, miniMapPosition, textColor, detailLevel, etc.)
Offline Beppe

Junior Duke





« Reply #4 - Posted 2013-08-21 22:46:48 »

Quote
The idea is to separate your game's logic from painting the game,
Yes this is the logic's advice.. so thank at all ... Grin
Offline SHC
« Reply #5 - Posted 2013-08-22 03:45:30 »

I too use conditional statements in my render method.

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public void render()
{
    switch (gameState)
    {
        case GAME_INTRO:
            renderIntroScreen();
            break;
        case GAME_PAUSED:
            renderPauseScreen();
            break;
        case GAME_PLAYING:
            renderPlayingScreen();
            break;
        case GAME_OVER:
            renderGameOverScreen();
            break;
    }
}

It's not bad to have conditional statements in render code. It's only bad to do logic in render method.

Offline Several Kilo-Bytes

Senior Duke


Medals: 11



« Reply #6 - Posted 2013-08-22 18:31:02 »

Just to clarify, by logic you all mean state changes. Drawing methods should have no side effects. Running the game at 60 FPS, 1 FPS, 120 FPS, or 0 FPS should not change how the game runs. if(doSomething && doSomethingElse) in a paint method is not what you mean by logic.
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