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How to best colourise an object when touched

edited February 2012 in Questions Posts: 9

Button type things in most applications look best when they change colour or tone (and make a sound like a click - thats the easy bit I think) when they are touched, particularly while they are touched - to make it look like they really have been depressed as a real button. My question is how best to do this in Codea. If I use a rectangle or ellipse how can apply a colour change only to the touched shape. If I use a sprite am I best make a copy of the sprite in two different colour schemes.



  • If your using a sprite maybe tint() will save the use of a second sprite

  • Posts: 2,820

    ^ Ditto ^

  • Thanks, that maybe of help.

  • I really don't get it. Why aren't commands such as fill() and tint() applied to specific things? Why do they have to be applied universally?

  • edited February 2012 Posts: 622

    To be specific try


    Using the values you prefer

  • SimeonSimeon Admin Mod
    Posts: 5,032

    @mattbastin it's a state-driven environment. You can wrap these things up into objects, if you like. For example, here is a rectangle class that maintains its style and transform as a state:

    Rectangle = class()
    function Rectangle:init( x, y, w, h )
        self.pos = vec2(x,y)
        self.size = vec2(w,h)
        self.fill = color( 255, 255, 255 )
        self.stroke = color( 0, 0, 0, 0 )
        self.strokeWidth = 0
    function Rectangle:draw()
        stroke( self.stroke )
        strokeWidth( self.strokeWidth )
        fill( self.fill )
        rect( self.pos.x, self.pos.y, self.size.x, self.size.y )

    You could use it like this:

    function setup()
        rect1 = Rectangle( 0, 0, 100, 100 )
        rect1.fill = color( 255, 0, 0 )
        rect1.stroke = color( 255 )
        rect1.strokeWidth = 5
        rect2 = Rectangle( 100, 100, 100, 100 )
        rect2.fill = color( 0, 0, 255 )
    function draw()
  • Thanks very much. I tried the code and with a bit of tweaking with the colours got it to work as I expected ( I mean from reading your code). I feel like I have a lt to learn.

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