Computer Science Canada

How do you move Polygons?
Author:  Nyrd [ Sat Nov 20, 2004 4:22 pm ]
Post subject:  How do you move Polygons?
I'm making a 3-d type game using polygons. I came to a problem. I CAN'T MOVE ANY POLYGON !!!

It's not that i don't know how, we learned that in class, but i always get an error message such as "Compilation Time expected" (What does it mean anyway?) If you could help it would be much appreciated.
Author:  Mr. Glib [ Sat Nov 20, 2004 4:39 pm ]
Post subject: 
Nyrd,

when you mean 'move' do you mean erasing the polgyon image that you've drawn and then redrawing it somewhere else on the screen or are you refering to animation?
Author:  Cervantes [ Sat Nov 20, 2004 5:15 pm ]
Post subject: 
Posting the code that is giving you trouble (and any code related to it that you deem necessary [such as variable initialization]) will help us to help you.
Author:  Tony [ Sat Nov 20, 2004 5:20 pm ]
Post subject: 
your polygon should be in the form of

(p1x + x, p1y + y, p2x + x, p2y + y, ... pNx + x, pNy + y)

where p#x/p#y decribe verticies in relation to each other (as if the shape was centered at (0,0) and +x +y are offsets that actually move the shape around.

It's the same for 3D, you just also have the +z.
Author:  Nyrd [ Sat Nov 20, 2004 6:12 pm ]
Post subject: 
code:

It's the same for 3D, you just also have the +z.


Does this mean that turing has an inbuilt 3-D drawing function?
Cause the way I'm making it 3-D is by drawing one polygon, morphing it to the shape i want, then drawing another in a lighter/darker colour the fits with this one to make a 3-D illusion.

code:

var x : array 1 .. 9 of int := init (100, 100 , 135 ,
            185 ,
            220 , 200 , 137 , 55 , 5 )
        var y : array 1 .. 9 of int := init (150 , 150 , 145 ,
            185 ,
            150 , 135 , 102 , 50 , 50 )
          Draw.FillPolygon (x , y, 9 , grey)
    var x1 : array 1 .. 5 of int := init (220, 200, 135, 135, 50)
    var y1 : array 1 .. 5 of int := init (150, 120, 85, 65, 50)
    Draw.FillPolygon (x1, y1, 5, darkgrey)


If there is another way please tell, cause this one takes a while to get to look right
Author:  Tony [ Sat Nov 20, 2004 6:16 pm ]
Post subject: 
are you trying to draw a single image that looks like 3D, or an actual 3D shape that you can rotate?
Author:  Nyrd [ Sat Nov 20, 2004 6:17 pm ]
Post subject: 
oh yeah, what i mean by move is that i make the polygon, erase it then draw it in another place. I use this cause it's the only way i know, how does the other work?
Author:  Tony [ Sat Nov 20, 2004 6:21 pm ]
Post subject: 
yeah, that's how you do that. I'm just wondering how you determine where to draw it in the next frame.

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