scala.swing: Trying to scale images to window size, but size returns 0 -

it should go without saying, i'm new swing.

i'm trying make simple little thing display 2 images side side, large window allow.

in theory happening is:

• we imageicon, in case 001.jpg.

• we figure out ratio of width/height of imageicon.

• we turn imageicon image.

• we turn image new correctly sized image.

• we turn image image icon.

this breaks down because way i've found window size size, keeps returning 0s.

this code have right now:

class ui extends mainframe {     title = "matt's window header"     preferredsize = new dimension(1920, 1080)     var imageicon = new imageicon("001.jpg")     val imgratio = imageicon.geticonwidth.todouble / imageicon.geticonheight.todouble     println(size)     pack()     println(imgratio)     val image = imageicon.getimage()     val newimg = image.getscaledinstance(size.width, (size.width * imgratio.toint),  java.awt.image.scale_smooth)     imageicon = new imageicon(newimg)     contents = new label {        icon = imageicon    } } 

as aside, great if give me info how load different image, instead of 001.jpg.

sizeis not determined @ point accessing it. however, preferredsizeis. if add println(preferredsize) dimensions set.