Beginner confused with positioning

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upatree

11

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Joined: 26th Nov 2012

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Posted: 30th Dec 2012 23:32

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Not a newbie to basic (hacked a few things together with Amos on the Amiga years ago) but new to AGK.

I'm trying to draw a 3x3 display on my screen, three squares of equal dimensions filling the screen horizontally, and taking up the same amount of space vertically. I am using the default SetDisplayAspect(0.66) from the wizard.

I have drawn the sprites like so:

+ Code Snippet

    for block_counter = 1 to 9
        createsprite(block_counter,0)
    next

    for block_counter = 1 to 9
        setspritesize(block_counter,getvirtualwidth()/3,-1)
    next

and have set each with a unique colour.

However, positioning them is confusing as heck for me.

I am setting the first row of three squares like this:

+ Code Snippet

    setspriteposition(1,(getvirtualwidth()/3)*0,0)
    setspriteposition(2,(getvirtualwidth()/3)*1,0)
    setspriteposition(3,(getvirtualwidth()/3)*2,0)

and this is working fine. However, dealing with the vertical positioning of row two and three is just

for me.

Could someone give me an example of calculating the vertical position so that row two sits directly below row one (with no gap) and row three sits directly below row two, of course maintaining the size and aspect of the squares?

Thanks!

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The Zoq2

15

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Joined: 4th Nov 2009

Location: Linköping, Sweden

Posted: 31st Dec 2012 01:01 Edited at: 31st Dec 2012 01:07

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I would store the blocks in an array which enables you to go thru them one by 1. Then use 2 for loops, one for vertical and one for horizontal positioning

+ Code Snippet

blocks[9] as integer

for block_counter = 1 to 9
    blocks[block_counter] = createsprite()

    setspritesize(blocks[block_counter],getvirtualwidth()/3,-1)
next
block = 1 //Setting the first block to count thru
for x = 0 to 2 //Starting the first for loop for the x positioning
    for y = 0 to 2 //Starting the second for loop for the y         positioning
        setspriteposition(blocks[block],(getvirtualwidth()/3)*x,      getvirtualheight() * y) //Positioning the sprites by multiplying the position with the x and y values

        block = block + 1 //increasing the block changed by one
    next y
next x

I hope that does what you want it to

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Hodgey

15

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Joined: 10th Oct 2009

Location: Australia

Posted: 31st Dec 2012 06:54

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The funny thing about using the display aspect (aka percentage system) is that 1% along the x-axis is not equal to 1% on the y-axis, in this case, the x-axis is only 66% of the y-axis. Try multiplying the y-values by the display aspect e.g SetSpritePosition(spr, x, y*getDisplayAspect()). You might have to fiddle around with ratios until you've got what you want.

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upatree

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Joined: 26th Nov 2012

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Posted: 31st Dec 2012 13:13

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Thanks guys, the example code was much cleaner than I had written, and multiplying y by getDisplayAspect worked a treat for positioning the squares. Thanks!

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