Computer Science Canada

Orbit! Help! Orbit around center of screen.
Author:  Atherial [ Mon Oct 05, 2015 9:49 am ]
Post subject:  Orbit! Help! Orbit around center of screen.
What is it you are trying to achieve?
I am attempting to make a square picture, of bit map format, rotate around the center of my screen.


What is the problem you are having?
Im not sure the equation for a rotation around the center, and any other previous tutorials have not been working, resulting with a static image (When using for statements.)


Please specify what version of Turing you are using
<Using 4.1.1>

I hate to ask for this, without any attempt at it myself, but I have been trying, but nothing ive tried has been near to working- If someone can point me in the proper direction, that would be greatly appreciated. Thanks so much for the help.
-Mackenzie
Author:  Insectoid [ Mon Oct 05, 2015 1:53 pm ]
Post subject:  RE:Orbit! Help! Orbit around center of screen.
There's a number of ways you can do it. You could use the equation for a circle, or you could use physics with velocities, or trigonometry. There are plenty of ways, but ultimately you need to be changing the x and y coordinates of the image inside a loop. Can you get an image to move on the screen at all?
Author:  Atherial [ Mon Oct 05, 2015 4:05 pm ]
Post subject:  Re: Orbit! Help! Orbit around center of screen.
Yes, Im able to move objects, using loops and view updates, but I dont really know how id do the rest- I understand how to loop and make x's and y's that change within a loop, but ive only been able to make them move in straight lines-
Thanks for the reply, any additional help would be much appreciated!
-Mac
Author:  Atherial [ Mon Oct 05, 2015 4:47 pm ]
Post subject:  Re: Orbit! Help! Orbit around center of screen.
UPDATE:
Turing:

View.Set ("graphics,offscreenonly")
var x := maxx div 2
var y := maxy div 2

var xDist, yDist : real %width/height of the circle 
var angle : int := 10 %where the little goes around the big circle
var hyp : int := 60
var earth : int := Sprite.New(Pic.FileNew("earth.bmp"))
Sprite.SetPosition(earth,x,y,true)
Sprite.Show(earth)

loop
    angle := angle - 1
    % trig calculations
    xDist := cosd (angle) * hyp
    yDist := sind (angle) * hyp

    Sprite.SetPosition(earth,round (x + xDist),round (y + yDist),true)
    %Draw.FillOval (round (x + xDist), round (y + yDist), 5, 5, 26)
   
    View.Update ()
    delay (5)
    %cls ()
end loop


[size=18]Okay, so I have gotten this far. It spins, It works.. But- How would I change the distance that it spins from- Right now, I have no idea. It spins around the center of the turing default window, and id like it to go further away from the center. Thank you! -Mac [/size]
Author:  Atherial [ Mon Oct 05, 2015 5:07 pm ]
Post subject:  Re: Orbit! Help! Orbit around center of screen.
Again, figured this out- Changing the number hyp is originally declared as changes it! Thanks!




SOLVED

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