double newX = window.x, newY = window.y, newW = window.width, newH = window.height;

            dragX = snapFunc.apply(dragX);
            dragY = snapFunc.apply(dragY);

            double centreX = oppositeX()*window.width;
            double centreY = oppositeY()*window.height;

            double draggedX = xPos*window.width + dragX;
            double draggedY = yPos*window.height + dragY;

            if(isShifting && xPos != 0.5 && yPos != 0.5){ //uniform rescaling, only used on corners
                double widthMultiplier = (draggedX - centreX) / window.width;
                double heightMultiplier = (draggedY - centreY) / window.height;
                double multiplier = Math.abs(widthMultiplier) < Math.abs(heightMultiplier) ? widthMultiplier : heightMultiplier;
                double multiplierAbs = Math.abs(multiplier);

                if(xPos == 1.0F && yPos == 1.0F) {
                    draggedX = draggedX > centreX ? window.width * multiplierAbs : window.width * -multiplierAbs;
                    draggedY = draggedY > centreY ? window.height * multiplierAbs : window.height * -multiplierAbs;
                }
                if(xPos == 1.0F && yPos == 0.0F){
                    draggedX = draggedX > centreX ? window.width * multiplierAbs : window.width * -multiplierAbs;
                    draggedY = draggedY > centreY ? window.height * multiplier : window.height * -multiplier;
                }
            }

            if(xPos != 0.5) { //middle rescale boxes only change one axis
                newX += centreX;
                newW = draggedX - centreX;
            }

            if(yPos != 0.5) { //middle rescale boxes only change one axis
                newY += centreY;
                newH = draggedY - centreY;
            }

            if(newW < 0){ // flip negative width
                newX += newW;
                newW = -newW;
            }
            if(newH < 0){ // flip negative height
                newY += newH;
                newH = -newH;
            }