블랙베리 게임 만들기 part-2

출처 - http://www.toniwestbrook.com/archives/71

GalacticBlast.java


package com.synthdreams.GalacticBlast; import net.rim.device.api.ui.UiApplication; /** * Initial main class that starts the ball rolling * UiApplication is extended to provide Blackberry * functionality, specifically the Event Dispatcher * and Screen pusher */ public class GalacticBlast extends UiApplication { public static void main(String[] args) { GalacticBlast GalacticBlast = new GalacticBlast(); // The Blackberry's message pump, handles key // presses and system events GalacticBlast.enterEventDispatcher(); } public GalacticBlast() { // The first thing we do is show the menu screen, defined by the // 'Menu' class. We accomplish this with a call to pushScreen, // which puts screens on the stack (Class specified must be a type // of screen, such as MainScreen). The top most screen is the // one shown. Our first one will be the menu, and later the game // itself will sit on top of this. When the game quits, it will // pop that screen off the stack and return to the menu screen. pushScreen(new Menu()); } }

여기서 주요한 처리과정은 없고 단순히 프로그램 진입점이라고 생각하면된다. 소스를 보면 알 수 있듯이, 메뉴클래스로 바로 넘어간다. 메뉴에서는 메인메뉴를 보여주게 된다. 메인메뉴에서 플레이,저장,불러오기, 구성설정, 종료하기 등등을 하게 된다.
 

메인 메뉴

우리가 만들 메인 메뉴는 MainScreen 을 상속받아 만든다. 나는 텍스트와 버튼으로만 이루어진 단순한 화면을 만들었다. 룩엔필은 블랙베리의 기본 ui 를 사용했다.  메뉴섹션에서는 게임플레이를 하기위한 테크닉은 별게 없다. 

 블랙베리 UI 를 구성하기위한 메니저 클래스는 여러 콤포넌트의 배치를 담당한다. 메니저 클래스는 여러개가 있을수 있으며 각각은 콤포넌트를 가질 수 있다. 기본 레이아웃메니저와는 조금 다른 메니저를 여기서는 사용했는데, 원한다면 당신또한 커스텀 메니저를 작성 할 수 있다. 여기 메인메뉴에서는 정확한 포지션을 지정해 줄 수 있는 커스텀 레이아웃 메니저와, 세로방향으로 컴포넌트를 배열해주는 기본 레이아웃 메니저를 사용했다.

더해서, 버튼을 하나더 만든다. 이 버튼을 누르면 게임플레이 클래스를 스크린 스택에 넣어준다. ( 초기화 클래스에서 메뉴 클래스를 스크린 스택에 집어넣는것과 동일한 역할을 한다. ) 또한 커스텀필드와 필드메니저는 특정 X,Y 위치에 컴포넌트를 나두게 한다. 필드메니저는 높이를 지정해 줬고, 수진 공간을 버퍼로 이용할 수 있게 됐다. [ 먼말인지-_-;;]
 

Menu.java

package com.synthdreams.GalacticBlast; import net.rim.device.api.ui.*; import net.rim.device.api.ui.component.*; import net.rim.device.api.ui.container.*; /** * The menu class handles showing the main menu and intercepting when the user quits or * begins the game. If the user presses the button to begin, the Menu class starts * the game going. */ class Menu extends MainScreen { GamePlay _game; // GamePlay handles the action part of the game itself int _invokeID; // A handle to our invocation of scanning for when the game ends // To add functionality to clicking the button, we need to override the button's // trackwheelClick method. Here we define _startButton as a button with // text, positioning, and trackwheelClick we want. ButtonField _startButton = new ButtonField("Start Game!", ButtonField.FIELD_HCENTER | ButtonField.FIELD_BOTTOM) { protected boolean trackwheelClick(int status, int time) { // If the button is pressed, we create a new GamePlay object _game = new GamePlay(); // Then we push it onto the screen stack. This then becomes the // active screen. See GalacticBlast.java for notes about pushing // screens onto the stack getUiEngine().pushScreen(_game); // The invokeLater method allows us to continually run a segment of // code from outside the GamePlay object. In this case, we do // this to monitor if the gameplay object is active our not. // When the player loses, the object marks itself inactive, at // which point we first cancel invoking further, then stop // the music from playing, then pop the gameplay screen off // the stack so we return to the main menu. _invokeID = getApplication().invokeLater(new Runnable() { public void run() { // Check to see if the game is done. if (_game.getActive() == false) { // Cancel invoking this piece of code again (normally is invoked // every 500 ms, as specified below) getApplication().cancelInvokeLater(_invokeID); // Kill the music GamePlay.snd.stopMusic(); // Pop the gameplay screen off the stack, which returns // the user to the main menu getUiEngine().popScreen(_game); // Display the final score Dialog.inform("Final Score: " + _game.getScore()); // We're done with our game object now _game = null; } } } , 500,true); // rerun this code every 500ms return true; } }; // Normally LabelFields are arranged in a very plain order depending on the // Layout manager. They'll repeat vertically with the option of left/center/right // justifying. But sometimes it's nice to be able to specificy exactly in X,Y coordinates // where you want the field to go. This class, in conjunction with the Custom Manager // defined below, allows for this // Additionally, a "customStyle" is defined for the field. For our cases, this // is either left to 0 for normal X,Y positioning, set to 1 for X set to 1/8th the total // width of the screen, or set to 2 for X+fieldwidth set to 7/8th the total width of the screen. // 1/8th and 7/8th for the edge of the text allows for columns to be made, for scores, // instructions, or anything else. More custom centering or something more dynamic // could be done with this variable, but its fine for our purposes right now. class CustomTextField extends LabelField { int _xPos, _yPos, _customStyle; // coordinates and style // We pass in the coordinates and the custom style CustomTextField(String passLabel, int passStyle, int passX, int passY) { super(passLabel); _xPos = passX; _yPos = passY; _customStyle = passStyle; } // Getters for position and style int getX() { return _xPos; } int getY() { return _yPos; } int getCustomStyle() { return _customStyle; } } // Our custom manager is where the magic happens for allowing customtextfields // to be placed at any X,Y coordinate. It reads in the coordinates from the // field and places it at those coordinates in the layout. It will also // look at custom layout, and if centered is specified, will ignore the X coordinate // and center it at the Y coordinate on the screen. Additionally, the total height // of the manager can be control how much space it takes up regardless of how many // fields it contains class CustomManager extends Manager { int _managerHeight; // Total height of the manager // Pass in desired height. Scrolling is turned off in both directions. public CustomManager(int passHeight) { super(Manager.NO_HORIZONTAL_SCROLL | Manager.NO_VERTICAL_SCROLL); _managerHeight = passHeight; } // Sublayout is called automatically to position all the internal fields to this // layout. Its sublayouts job to read in the custom coordinates of each of the fields // and place them accordingly. protected void sublayout(int width, int height) { CustomTextField field; // Loop through all the fields contained with the layout manager for (int lcv = 0; lcv < getFieldCount(); lcv++) { //Get the field. field = (CustomTextField)getField(lcv); //Obtain the custom x and y coordinates for //the field and set the position for //the field. switch (field.getCustomStyle()) { // Custom style 1 is for the left side of the text to be at 1/8th the width // of the screen case 1: setPositionChild(field, width / 8 , field.getY()); break; // Custom style 2 is for the right side of the text to be at 7/8ths the width // of the screen case 2: setPositionChild(field, width * 7 / 8 - field.getPreferredWidth(), field.getY()); break; // Any other custom style gets position strictly from X,Y default: setPositionChild(field, field.getX(), field.getY()); } //Layout the field. layoutChild(field, width, height); } //Set the manager's dimensions setExtent(width, _managerHeight); } public int getPreferredWidth() { return Graphics.getScreenWidth(); } public int getPreferredHeight() { return Graphics.getScreenHeight(); } } // Menu constructor public Menu() { // First, turn off scroll bars for this screen in case we accidentally push past the // edge with our fields/whitespace super(NO_VERTICAL_SCROLL); // We set the title on the screen LabelField title = new LabelField("Galactic Blast Demo", LabelField.FIELD_HCENTER); setTitle(title); // CustomManagers can also be used just as space buffers. First we make // 20 pixels of space getScreen().add(new CustomManager(20)); // Add some text add(new LabelField("Instructions", LabelField.FIELD_HCENTER)); // Create another custom manager, but this one we'll use for more than just // spacing, we'll actually position some text fields (our instructions) CustomManager instManager = new CustomManager(Graphics.getScreenHeight() - 145); getScreen().add(instManager); // A multi-d array that will store our instruction fields CustomTextField instArray[][] = new CustomTextField[3][2]; instArray[0][0]= new CustomTextField("Trackball", 1, 0, 20); instArray[1][0] = new CustomTextField("Space", 1, 0, 40); instArray[2][0] = new CustomTextField("Escape", 1, 0, 60); instArray[0][1] = new CustomTextField("Move Ship", 2, 0, 20); instArray[1][1] = new CustomTextField("Fire Cannon", 2, 0, 40); instArray[2][1] = new CustomTextField("Quit Game", 2, 0, 60); // Loop through our array and add each field to the layout manager with a different // font for (int lcv = 0 ; lcv < 3 * 2 ; lcv++) { instArray[lcv%3][lcv/3].setFont(Font.getDefault().derive(Font.PLAIN, 16)); instManager.add(instArray[lcv%3][lcv/3]); } // add our button that has the click method overridden add(_startButton); // Add a buffer of 10 pixels getScreen().add(new CustomManager(10)); // More text LabelField copyrightText = new LabelField("Copyright 2008 Synthetic Dreams", LabelField.FIELD_HCENTER); copyrightText.setFont(Font.getDefault().derive(Font.ITALIC, 14)); add(copyrightText); } }

이제 실행해보면 다음과 같이 메뉴 스크린을 확인할 수 있다.  ( 실행을 위해서 소스중에 정의되지 않은 클래스는 주석처리를 하도록 하자 )

이제 파트3으로 ㄱㄱ