Processes the updates required each render frame. Any code in the update() method will be called ONCE for each render frame BEFORE the tick() method. This differs from the tick() method in that the tick method can be called multiple times during a render frame depending on how many viewports your simulation is being rendered to, whereas the update() method is only called once. It is therefore the perfect place to put code that will control your entity's motion, AI etc.
CanvasRenderingContext2DctxThe canvas context to render to.