// Image Wall example
//
// Example usage of Dali API
//

var imageDir = "@DEMO_STYLE_IMAGE_DIR@";

var NUMBER_OF_IMAGES = 40; // for now use 16 ( demo files go up to 30)
var VIDEO_WALL_ROWS = 7; // use 3 rows for the video wall
var VIDEO_WALL_COLUMNS = 12; // use 12 columns for the video wall
var VIDEO_WALL_ITEM_SIZE = 128; // width / height of a item in the video wall
var BORDER_SIZE = 5;
var VIDEO_WALL_ITEM_SIZE_NO_BORDER = VIDEO_WALL_ITEM_SIZE - BORDER_SIZE;
var VIDEO_WALL_WIDTH = VIDEO_WALL_COLUMNS * VIDEO_WALL_ITEM_SIZE;
var VIDEO_WALL_HEIGHT = VIDEO_WALL_ROWS * VIDEO_WALL_ITEM_SIZE;

var daliApp = {};

var wallRootActor; // the root actor of the video wall

// we want demo images of format gallery-small-1.jpg
daliApp.getFileName = function(index) {
    fileName = "gallery-small-" + (index+1) + ".jpg";
    return fileName;
}

daliApp.createRootActor = function() {
    wallRootActor = new dali.Actor();
    wallRootActor.parentOrigin = dali.CENTER;
    wallRootActor.anchorPoint = dali.CENTER;
    dali.stage.add(wallRootActor);
}

daliApp.getWallActorIndex = function(x, y) {
    return x + y * VIDEO_WALL_COLUMNS;
}

daliApp.createActors = function() {
    daliApp.createRootActor();

    for (y = 0; y < VIDEO_WALL_ROWS; ++y) {
        for (x = 0; x < VIDEO_WALL_COLUMNS; ++x) {

            var actorIndex = daliApp.getWallActorIndex(x, y);
            var imageView = new dali.Control("ImageView");

            // wrap image index between 0 and NUMBER_OF_IMAGES
            var imageIndex = actorIndex % NUMBER_OF_IMAGES;

            imageView.image = imageDir + daliApp.getFileName(imageIndex);

            imageView.parentOrigin = dali.CENTER;
            imageView.anchorPoint = dali.CENTER;
            imageView.size = [VIDEO_WALL_ITEM_SIZE_NO_BORDER, VIDEO_WALL_ITEM_SIZE_NO_BORDER, 1.0]; // start with zero size so it zooms up

            var xPosition = x * VIDEO_WALL_ITEM_SIZE;
            //  as the middle the wall is at zero (relative to wallRootActor), we need to subtract half the wall width.
            // + add half item size because the item anchor point is the center of the wallRootActor.
            xPosition = xPosition - (VIDEO_WALL_WIDTH / 2) + (VIDEO_WALL_ITEM_SIZE / 2);

            var yPosition = y * VIDEO_WALL_ITEM_SIZE;
            yPosition = yPosition - (VIDEO_WALL_HEIGHT / 2) + (VIDEO_WALL_ITEM_SIZE / 2);

            imageView.position = [xPosition, yPosition, 0.0];

            // Add to the video wall root actor.
            wallRootActor.add(imageView);
        }
    }
}

function Initialise() {
    daliApp.createActors();
}

Initialise();