sourceafFantomMappy::Block.fan

**
** A simple bean class which represents a 'Block' as used by 'Mappy'. A 'Block' may contain up to 
** 4 [layers]`BlockLayer` of images (1 background layer and 3 foreground layers), 7 fields of user 
** data, quadratic collision information and 4 other flags.
** 
@Js
class Block {
    ** User data is indexed 1 <=> 7
    Int:Int             userData        := [:]  // use a map 'cos of the "off by 1" index
    BlockLayer:Int      imageIndex      := [:]
    BlockCorner:Bool    collisionFlag   := [:]
    BlockFlag:Bool      flag            := [:]
    Str?                textString
    
    RendererDrawMode drawMode() {
        if (flag[BlockPillerFlag.leftSidePillar.toBlockflag])
            return RendererDrawMode.drawLeftSideOnly
        if (flag[BlockPillerFlag.rightSidePillar.toBlockflag])
            return RendererDrawMode.drawRightSideOnly
        return RendererDrawMode.drawAll
    }
}

@Js
enum class BlockLayer {
    background,
    foreground1,
    foreground2,
    foreground3
}

@Js
enum class BlockCorner {    
    topLeft,
    topRight,
    bottomLeft,
    bottomRight
}

@Js
enum class BlockFlag {
    trigger,
    unused1,
    unused2,
    unused3 
}

@Js
enum class BlockPillerFlag {
    none            (BlockFlag.trigger, RendererDrawMode.drawAll),
    attachNext      (BlockFlag.unused1, RendererDrawMode.drawAll),
    leftSidePillar  (BlockFlag.unused2, RendererDrawMode.drawLeftSideOnly),
    rightSidePillar (BlockFlag.unused3, RendererDrawMode.drawRightSideOnly)
    
    const BlockFlag         toBlockflag
    const RendererDrawMode toDrawMode
    
    private new make(BlockFlag blockFlag, RendererDrawMode drawMode) {
        this.toBlockflag = blockFlag
        this.toDrawMode = drawMode
    }   
}