Rogue.md

Rogue

This is a simple template to make a game inspired by Rogue from 1980, thus to make a roguelike.

Screenshot

Code

class Roguelike extends hxd.App {
    var player : h2d.Object;
    final fieldSize = 32;
    var levelString : String = "

                                                    ###################
               ###########################          #                 #
               #                         #          #            A    #
               #                         ############                 #
               #                                                      #
               #            @            ############                 #
               #                         #          #                 #
               #                         #          #      C          #
               #                         #          ###################
               #   E                     #
               #                         #
               ###########################
    ";
    var walls : Array<h2d.Object> = [];
    var howToPlayInfo : h2d.Object;
    static function main() {new Roguelike();}
    override function init() {
        var t = new h2d.Text( hxd.res.DefaultFont.get(), s2d );
        t.text = "Use the arrow keys\nor w-a-s-d to move around."; t.scale(2);
        howToPlayInfo = t;

        // setting up the level from a string
        var x = 0;
        var y = 0;
        for( i in 0...levelString.length ){
            var char = levelString.charAt( i );
            if( char=="\n" ){
                y++;
                x=0;
            }
            else
                if( char!=" ")
                    characterToGameObject( char, x, y );
            x++;

        }

        // setting camera
        s2d.camera.anchorX = 0.5;
        s2d.camera.anchorY = 0.5;

        // placing how-to-play info correctly (after player has been placed)
        var cam = s2d.camera;
        howToPlayInfo.setPosition( player.x - (cam.viewportWidth/2), player.y - (cam.viewportHeight/2) );
    }

    function characterToGameObject( character:String, x:Float, y:Float ){
        if( character!=" " ){ // no empty objects
            var o = new h2d.Object( s2d );
            var t = new h2d.Text( hxd.res.DefaultFont.get(), o );
            t.text = character; t.scale( 2 );
            o.setPosition( x *fieldSize, y *fieldSize );
            // creating the "real" logical object
            switch ( character ){
                case "@": // the player
                    player = o;
                    // basic camera
                    s2d.camera.follow = player;
                case "#": // walls
                    walls.push( o );
                default:
                    trace('The character <$character> hasn\'t been assigned to a game object.'); // doesn't work right... but good enough
            }
        }
    }

    var dt_counter : Float = 0;

    override function update(dt:Float) {
        dt_counter += dt;
        if( dt_counter > 0.1 ){ // 10 times per second
            // player movement
            if( hxd.Key.isDown( hxd.Key.UP   )  || hxd.Key.isDown( hxd.Key.W ) )
                moveIfPositionIsWallFree( player, player.x, player.y - fieldSize ); // okay the code's a bit clunky I admit that!
            if( hxd.Key.isDown( hxd.Key.DOWN )  || hxd.Key.isDown( hxd.Key.S ) )
                moveIfPositionIsWallFree( player, player.x, player.y + fieldSize );
            if( hxd.Key.isDown( hxd.Key.LEFT )  || hxd.Key.isDown( hxd.Key.A ) )
                moveIfPositionIsWallFree( player, player.x - fieldSize, player.y );
            if( hxd.Key.isDown( hxd.Key.RIGHT ) || hxd.Key.isDown( hxd.Key.D ) )
                moveIfPositionIsWallFree( player, player.x + fieldSize, player.y );

            dt_counter -= 0.1; // reset
            // could also just do `dt_counter = 0;` but is less fine
        }
    }

    function moveIfPositionIsWallFree( obj:h2d.Object, x:Float, y:Float ) {
        if( checkIfPositionIsWallFree(x,y) )
            obj.setPosition(x,y);
    }

    function checkIfPositionIsWallFree( x:Float, y:Float ) : Bool {
        var free = true;
        for( w in walls ){
            if( w.x == x && w.y == y )
                free = false;
        }
        return free;
    }
}

hxml-file sample when using HashLink

-lib heaps
-lib hlsdl
-main Roguelike
-hl roguelike.hl

Further hints

• The user could even create their own levels in a simple text file editor. You could then get the string by sys.io.File.getContent( "path/to/file.txt" ) and use the string as a levelString input.

• You can also close the gaps in the walls (the gaps between the letters). You can scale up each h2d.Text object by a higher factor (3 for instance). However to completely close all gaps you may have to split up fieldSize into two values (like fieldW and fieldH), depending on the letter size of the Font you are using.