Off-Center Rotations?

Colty27Colty27 Member Posts: 7
in Working with GS (Mac)

Could Someone help me with "Off-Center Rotations", I can't quite figure it out. I want to rotate a cannon turret, but the rotation is centered on the barrel of the turret. Could Some one please help? Thank You.

Comments

  • SmokeyAce73SmokeyAce73 EarthMember Posts: 370

    Could try this, might work, might not:

    Create real attributes for the cannons rotation point
    Constrain then rotate

    I'm new myself but saw no replies for thought i'd give it a go

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  • gyroscopegyroscope I am here.Member, Sous Chef, PRO Posts: 6,598
    edited March 2014

    @Colty27 Hi, although this can be done with behaviours, there's another straightforward way:

    Remake your cannon
    turret graphic, so that the centre point on the turret you want rotating is the middle, with added transparent space the other side of the graphic...

    Here's an illustration of what I mean:

    Now you can use rotate behaviours and it'll rotate properly as you want.

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  • SocksSocks London, UK.Member Posts: 12,822

    @Colty27 said:
    Could Someone help me with "Off-Center Rotations", I can't quite figure it out. I want to rotate a cannon turret, but the rotation is centered on the barrel of the turret. Could Some one please help? Thank You.

    You could use some simple trigonometry to position the centre of an orbital path wherever you want, add rotation at the same speed (and direction) of the orbital path and you can turn an object through any axis you want, it's not overly complex, you can do it with three constrain behaviours (X, Y + rotation).

    Hold on, let me make a quick demo for you . . . . .

  • SocksSocks London, UK.Member Posts: 12,822

    Here you go, a quick example file:

    https://www.mediafire.com/?btx52fc273fy3dq

    You can position the rotation point anywhere on an object (or outside of an object) using just the 'radius' value and an offset value for the 'game.time' part.

    . . . . . but . . . personally speaking I'd do it the way gyroscope mentions.

  • SocksSocks London, UK.Member Posts: 12,822

    One advantage to doing this using trigonometry (not really applicable in this case) is that you can do all sorts of magical wonderfulness, here's an example where I've put two centre points on a square, click anywhere on the screen to morph between the two centre points, not really much use in this situation but it shows you the power of simple trigonometry.

    Link: https://www.mediafire.com/?ievfta74sf0doh0

  • Colty27Colty27 Member Posts: 7

    Sweet! Thanks Everyone for your answers, really helpful @Socks!

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