Images in an array, not spacing correctly

问题:

The shapes are at the top of the image.

http://picturepush.com/public/6472916

The code looks like this:

    local xOffset = 0

    for i = 1, levelPacks[prevCurrentLevelPack][prevCurrentLevel].ammount do

        if i == 1 then --setup first one

            shapesPrevArray[i].x = 30
            shapesPrevArray[i].y = 41
            shapesPrevArray[i].isVisible = true

        end

        if i > 1 then --setup the rest

            --width of previous one plus the x value of the previous one to make them next to eachother.
            xOffset = shapesPrevArray[i - 1].width + shapesPrevArray[i - 1].x
            print("i:" .. i .. " width:" .. shapesPrevArray[i - 1].width .. " x value:" .. shapesPrevArray[i - 1].x .." xoffset:" .. xOffset)
            shapesPrevArray[i].x = xOffset    
            shapesPrevArray[i].y = 41
            shapesPrevArray[i].isVisible = true
            xOffset = 0

        end

    end

I'm trying to space all of the images in the array out with the same space between each image. Images in the array have different width. The .x value is at the top left corner of the shapes. Any help would be appreciated.

回答1:

Per the comment, the width of each shape is actually twice what it will be drawn as. So what you have to do is add up all the widths and divide the sum by 2; this gives you the total width needed by the shapes. Subtract this from the total width on the screen you want to take up; this gives you the amount of space available. Then divide that by the number of shapes, minus one; this gives you the amount of space to add to the right of each shape (approximately, since it probably won't divide exactly; just round down). So each shape's offset is the offset of the previous shape, plus half its width, plus the value we just calculated. I don't know Lua so I'll leave the coding to you.