//

// Manages the visible state of a level.

//

function LevelState(levmgr)

{

this.cachedLevMgr = levmgr;



// Array of images to load for the level

this.imageFiles = [ "blank", "dirt", "bedrock", "ice", "stone" ];



// No currently loaded level yet.

this.layout = null;



// Load graphics

this.imageCache = new Array;

for(var i = 0; i < this.imageFiles.length; ++i)

{

this.imageCache[i] = new Image;

this.imageCache[i].src = "images/" + this.imageFiles[i] + ".png";

}



// Initialise cells for level layout.

this.levelStyleCache = new Array;

for(var y = 0; y < this.cachedLevMgr.numYCells; ++y)

{

this.levelStyleCache[y] = new Array;

for(var x = 0; x < this.cachedLevMgr.numXCells; ++x)

this.levelStyleCache[y][x] = null;

}



this.ClearLevel = function()

{

var topLevelDiv = document.getElementById("maindiv");

var levDiv = document.getElementById("levelDiv");

if(levDiv != null)

topLevelDiv.removeChild(levDiv);

}



this.Reset = function(layoutState)

{

// Does not do an array copy, just makes a reference to the player's level layout.

this.layout = layoutState;



// Clear the existing layout.

this.ClearLevel();



//

// Set positions of the eggs and grain for the current player.

//

var topLevelDiv = document.getElementById("maindiv");

var levDiv = document.createElement("DIV");

levDiv.id = "levelDiv";

levDiv.style.position = "absolute";

levDiv.style.width = this.cachedLevMgr.levelXMax<<1;

levDiv.style.height = this.cachedLevMgr.levelYMax;

levDiv.style.backgroundColor = "#000000";

topLevelDiv.appendChild(levDiv);



for(var y = 0; y < this.cachedLevMgr.numYCells; ++y)

{

var row = this.levelStyleCache[y];

var imageRow = layoutState[y];

for(var x = 0; x < this.cachedLevMgr.numXCells; ++x)

{

if(imageRow[x] == this.cachedLevMgr.blank)

continue;



var newElem = document.createElement("IMG");

newElem.src = this.imageCache[imageRow[x]].src;

newElem.style.position = "absolute";

newElem.style.left = x<<4;

newElem.style.top = y<<4;

levDiv.appendChild(newElem);

row[x] = newElem.style;

}

}

}



// Used to erase an egg or grain when collected by the farmer

this.ClearCellAt = function(x, y)

{

this.layout[y][x] = 0;

this.levelStyleCache[y][x].visibility = "hidden";

}



} // end of Level object