Computer Science Canada

Drawing a Chessboard using repetition
Author:  Derpmemes [ Wed Jun 20, 2012 6:29 pm ]
Post subject:  Drawing a Chessboard using repetition
I don't know how to write a program to draw a chessboard using repetition. (8x8)
I know how to do it without using repetition.

The code it tried was:
drawfillbox (0,0,640,400,black)

for i: 1..640 by 160
drawfillbox (0+i,0,80,50,white)
end for

I know this is not the code but at least I tried.
Please Help.
:'(

The Chessboard I made without using repetition was easy. Here is the code:

drawfillbox (0,0,640,400,black)
%1
drawfillbox (0,0,80,50,white)
drawfillbox (160,0,240,50,white)
drawfillbox (320,0,400,50,white)
drawfillbox (480,0,560,50,white)
%2
drawfillbox (80,50,160,100,white)
drawfillbox (240,50,320,100,white)
drawfillbox (400,50,480,100,white)
drawfillbox (560,50,640,100,white)
%3
drawfillbox (0,100,80,150,white)
drawfillbox (160,100,240,150,white)
drawfillbox (320,100,400,150,white)
drawfillbox (480,100,560,150,white)
%4
drawfillbox (80,150,160,200,white)
drawfillbox (240,150,320,200,white)
drawfillbox (400,150,480,200,white)
drawfillbox (560,150,640,200,white)
%5
drawfillbox (0,200,80,250,white)
drawfillbox (160,200,240,250,white)
drawfillbox (320,200,400,250,white)
drawfillbox (480,200,560,250,white)
%6
drawfillbox (80,250,160,300,white)
drawfillbox (240,250,320,300,white)
drawfillbox (400,250,480,300,white)
drawfillbox (560,250,640,300,white)
%7
drawfillbox (0,300,80,350,white)
drawfillbox (160,300,240,350,white)
drawfillbox (320,300,400,350,white)
drawfillbox (480,300,560,350,white)
%8
drawfillbox (80,350,160,400,white)
drawfillbox (240,350,320,400,white)
drawfillbox (400,350,480,400,white)
drawfillbox (560,350,640,400,white)

Thank you.
Author:  Zren [ Wed Jun 20, 2012 8:17 pm ]
Post subject:  RE:Drawing a Chessboard using repetition
To figure out where you went wrong, use this:

drawbox (0+i,0,80,50, i % maxcolor)

It will only draw the borders of the boxes, and each box will be a different colour.

Edit: Also throw a delay in there, delay(1000) to watch how it draws it.
Author:  blaffypoo [ Thu Jun 21, 2012 10:38 am ]
Post subject:  RE:Drawing a Chessboard using repetition
View.Set ("graphics:400;400,offscreenonly,nobuttonbar,nocursor")
var Mx, My, Press : int := 0
loop
cls

Mouse.Where (Mx, My, Press)

for i : 0 .. 7
for j : 0 .. 7
if Mx > i * 50 and Mx < i * 50 + 50 and My > j * 50 and My < j * 50 + 50 then
Draw.FillBox (i * 50, j * 50, i * 50 + 50, j * 50 + 50, brightgreen)
else
Draw.FillBox (i * 50, j * 50, i * 50 + 50, j * 50 + 50, black)
end if
Draw.Box (i * 50, j * 50, i * 50 + 50, j * 50 + 50, white)
end for
end for

delay (10)

View.Update
end loop
Author:  SNIPERDUDE [ Fri Jun 22, 2012 11:49 am ]
Post subject:  Re: Drawing a Chessboard using repetition
Using mod might be simpler:

Turing:
View.Set("nobuttonbar, offscreenonly, graphics:450;450")

for j: 0..15
    for i: 0..15
        if (j + i) mod 2 = 0 then
            drawfillbox(i * 30, j * 30, i * 30 + 29, j * 30 + 29, 7)
        end if
    end for
end for


More on modulus:
http://simple.wikipedia.org/wiki/Modular_arithmetic

A useful thing you can do with mod is return whether a number is even (result = 0) or odd (result = 1) (number mod 2), which we did in the code above.
Author:  blaffypoo [ Sat Jun 23, 2012 7:37 am ]
Post subject:  RE:Drawing a Chessboard using repetition
I added in a mouse over block to the board to show which square your mouse is on

:


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