getBlocksFromRect.js

getBlocksFromRect.js

function getBlocksFromRect(width, height, blockCount) {
    var blocks = [], cols, rows;
    
    if (Math.sqrt(blockCount) === Math.floor(Math.sqrt(blockCount))) {
        cols = rows = Math.sqrt(blockCount);
    } else {
        cols = blockCount / 2 === Math.floor(blockCount / 2) ? 2 : 1;
        rows = blockCount / cols;
    }

    var blockWidth = Math.ceil(width/cols),
        blockHeight = Math.ceil(height/rows);

    for (var row = 0; row < rows; row++) {
        for (var col = 0; col < cols; col++) {
            var x = col * blockWidth,
                y = row * blockHeight,
                w,
                h;
            
            if (width - (col * blockWidth) >= blockWidth) {
                w = blockWidth;
            } else {
                w = width - (col * blockWidth);
            }
            
            if (height - (row * blockHeight) >= blockHeight) {
                h = blockHeight;
            } else {
                h = height - (row * blockHeight);
            }
            
            blocks.push({x: x, y: y, width: w, height: h});
        }
    }
    
    return blocks;
}