A value of 1 means no change to the scale, 0.5 means 'half the size', 2 means 'twice the size', etc. You can modify it via scale.x or scale.y or tTo(x, y).
It will place a re-calculated margin-left pixel value onto the canvas element which is updated on orientation/resizing. ('capguy/walk/', 1, 8, '', 4) creates a whole bunch of frame names. The next line scales the sprite down by 50% because it would otherwise be a bit too big for your scene.
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