What is the problem with this program??

[Hannah]

Quote:

var dot : int
var col : int
View.Set ("offscreenonly")
%Declares red, green and blue variables
var r, g, b : int
%Loop allows you where to draw the dots
for x : 1 .. maxx
for y : 1 .. 400
%Randomize red colour
randint (r, 116, 146)
%Randomize green color
randint (g, 143, 170)
%Radomize blue colour
randint (b, 12, 23)
%RBG Set colour program allows to you to mix the colours
RGB.SetColour (2, r / 255.0, g / 255.0, b / 255.0)
%draws randomized dots
Draw.Line (x, y, x, y, 2)
end for
end for
proc movcar
drawfillbox (5, 100, 80, 150, 64)
drawfillbox (75, 145, 80, 130, 68)
drawfillbox (75, 120, 80, 105, 68)
drawfillbox (12, 145, 50, 108, 69)
var line : array 1 .. 4 of int := init (71, 58, 58, 71)
var linea : array 1 .. 4 of int := init (145, 142, 110, 107)
drawfillpolygon (line, linea, 4, 54)
end movcar
movcar
var face : array 1 .. sizepic (0, 99, 80, 151) of int
process a
takepic (0, 99, 80, 151, face)
for x : 0 .. 308
drawpic (x, 99, face, 0)
delay (10)
exit when x = 308
end for
end a


%------CAR2-----------------
process movcar2
drawfillbox (404, 2, 458, 63, 64)
drawfillbox (408, 58, 423, 63, 68)
drawfillbox (435, 58, 450, 63, 68)
drawfillbox (412, 5, 450, 36, 148)
var age : array 1 .. 4 of int := init (409, 412, 450, 453)
var fag : array 1 .. 4 of int := init (53, 40, 40, 53)
drawfillpolygon (age, fag, 4, 54)
end movcar2

fork movcar2
fork a
var car : array 1 .. sizepic (404, 0, 458, 63) of int

takepic (404, 0, 458, 63, car)
for x : 0 .. 400
drawpic (404, x, car, 0)
delay (30)
exit when x = 98
View.Update
end for

Sorry... it's the same question again. But I seriously don't understand what is causing the black thing and what is causing the white wipe-outs.
I want to just leave the process so I tried and tried. But I just can't figure it out! UGHHHHHH!!!!!!!

Please let me know what's wrong.

P.s.Thank you guys very much for answering my previous question.

[Tony]

this is because you draw images inside the process, and display them to screen outside of the process. Since the two are not concurent, there will be times where you will update your screen only after a part of the image has been drawn.

[cool dude]

why do u even need processes. i suggest staying away from them because they cause a lot of problems. if u want use procedures and your problem will go away.