Computer Science Canada

Randomizing an exact amount on the screen
Author:  agnivohneb [ Wed Sep 05, 2007 6:34 pm ]
Post subject:  Randomizing an exact amount on the screen
I want to place a specific number of dots (example 6) in a 15 by 15 pixel area I want to randomize the output so the dots so up in a different spot every time. Any help I am not that good with math. If you need any more info just ask.
Author:  Clayton [ Wed Sep 05, 2007 6:48 pm ]
Post subject:  RE:Randomizing an exact amount on the screen
Think about this logically... Really, problem solving is one of the most important aspects of Computer Science. Break your big problem down into smaller problems.

1)You need to draw a dot randomly
2)You need to section off a 15 x 15 pixel area on the screen
3)The dot needs to appear in this area
4)Repeat 1) - 3) five more times
Author:  Nick [ Wed Sep 05, 2007 10:05 pm ]
Post subject:  RE:Randomizing an exact amount on the screen
well what i'd do is make an x and y varible for the dot's location then use randint to randomize where it goes and use randint to limit where the dots can go
Author:  d2bb [ Thu Sep 06, 2007 7:42 am ]
Post subject:  RE:Randomizing an exact amount on the screen
not even sure his question made to much sense, but just make a program to draw random x + y values inbetween 1-whatever our screen size is.


After this use a counted-loop it and you should be good.
Author:  agnivohneb [ Fri Sep 07, 2007 10:11 pm ]
Post subject:  Re: Randomizing an exact amount on the screen
I figured it out
Turing:
var x, y, x2, y2 : int := 1
var num : array 1 .. 15, 1 .. 15 of int

for i : 1 .. 15
    for j : 1 .. 15
        num (i, j) := Rand.Int (0, 225)
    end for
end for

for i : 1 .. 225 by 15
    for j : 1 .. 225 by 15
        for k : 1 .. num (x2, y2)
            loop
                x := Rand.Int (i, i + 14)
                y := Rand.Int (j, j + 14)
                exit when whatdotcolor (x, y) not= 7
            end loop
            Draw.Dot (x, y, black)
        end for
        y2 += 1
    end for
    x2 += 1
    y2 := 1
end for

I only set num to a random number for now i will change it later to use a specific number. I'm on the right track now. I think.
Author:  Nick [ Fri Sep 07, 2007 11:06 pm ]
Post subject:  RE:Randomizing an exact amount on the screen
you looking for something like this?

Turing:
var x, y : int

for i : 1 .. 6
    x := Rand.Int (100, 115)
    y := Rand.Int (100, 115)
    drawdot (x, y, black)
end for


what u did was go WAY to indepth for something pretty simple
Author:  agnivohneb [ Fri Sep 07, 2007 11:19 pm ]
Post subject:  RE:Randomizing an exact amount on the screen
That is the same thing I had only I expanded it to more 15x15 boxes there are 15x15 boxes = 225 pixels up and 225 pixels over each individual box is a unique number and when i release the program next week you will see were I'm going with this.
Author:  Nick [ Sat Sep 08, 2007 11:28 am ]
Post subject:  RE:Randomizing an exact amount on the screen
oh i get it i still dont get where ur going but i assume both ways would work for my way just make my for loop inside 2 others and have those 2 for loops equal the x and y inside the Rand.Int... when i get less lazy ill show u

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