Computer Science Canada

Chopy Lines
Author:  Lucas [ Tue Apr 12, 2011 9:19 pm ]
Post subject:  Chopy Lines
What is it you are trying to achieve?
When i say to draw the line, Im just drawing from one point to the next point, then so on, but the values of the points seem to change, or at least thats what i think, since noone of the points actually touch, and its all choppy. so im just wondering why this is happening and is there a way to make it smooth?


Turing:

View.Set ("graphics: 800; 800, offscreenonly")
type data :
    record
        x, y, dix, diy : real
        count, num : int
    end record
var points : array 1 .. 720 of data
var t : real := 0
var numpoints : int := 180
for a : 1 .. numpoints
    points (a).x := maxx div 2
    points (a).y := maxy div 2
    points (a).dix := 0
    points (a).diy := 0
    points (a).count := a
    points (a).num := a
end for
colorback (black)
loop
    t += 2
    for a : 1 .. numpoints
        points (a).count -= 1
        if points (a).count < 0 then
            points (a).x := maxx div 2
            points (a).y := maxy div 2
            points (a).dix := sind (t) * 4
            points (a).diy := cosd (t) * 4
            points (a).count := numpoints
        end if
        points (a).x += points (a).dix
        points (a).y += points (a).diy
        if points (a).x > maxx or points (a).x < 0 then
            points (a).dix := -points (a).dix
        end if
        if points (a).y > maxy or points (a).y < 0 then
            points (a).diy := -points (a).diy
        end if

        if points (a).num not= numpoints then
            Draw.Line (points (points (a).num).x div 1, points (points (a).num).y div 1, points (points (a + 1).num).x div 1, points (points (a + 1).num).y div 1, white)
        end if
        Draw.Line (points (points (numpoints).num).x div 1, points (points (numpoints).num).y div 1, points (points (1).num).x div 1, points (points (1).num).y div 1, white)
    end for
    View.Update
    delay (5)
    cls
end loop


Please specify what version of Turing you are using
4.1.1
Author:  Zren [ Tue Apr 12, 2011 11:12 pm ]
Post subject:  RE:Chopy Lines
Perhaps because you're calculating movement and rendering at the same time.

You're rendering a line to the next point before it's moved for that frame. Get in the habit of breaking up logic and drawing processes.

loop
resetSelectedPoints
movePoints
renderLines
end loop
Author:  Lucas [ Wed Apr 13, 2011 5:16 pm ]
Post subject:  RE:Chopy Lines
aaahhhh okay thx Very Happy

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