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smalltalkpharosqueakmorphic

animation in squeak smalltalk

I have a simple morph in squeak smalltalk. I want to move it from x1,y1 to x2,y2 (animation) with 5 seconds (or 10 seconds)

is there a build in way to create animation in squeak smalltalk ?

Solution

  • Yes, there is a built in way:

    Make a subclass of Morph and implement the two methods

    • stepTime (time between steps in milliseconds) and
    • step (is sent to the morph in regular intervals of time)

    A minimal example:

    Morph subclass: #MovingMorph
    instanceVariableNames: ''
    classVariableNames: ''
    category: 'MovingMorph'

    MovingMorph>>stepTime

    stepTime
    ^ 100

    MovingMorph>>step

    step
    self position: self position + (1@1)

    Now open a MovingMorph in the World (MovingMorph new openInWorld) and control the animation with startStepping and stopStepping.