checking if a mouse is over a rectangle

[silverknight108]

hello all again i have a problem i have a grid and i want to check exactly what square the mouse clicks and change its color
here is my grid code

Code: Select all

function dg()
h,w = love.window.getHeight,love.window.getWidth
bloks = {}
for x = 0,12 do
bloks[x] = {}
for y = 0,12 do
 bloks[x][y] = {}
 bloks[x][y] = love.graphics.rectangle("line",x*45,y*45,45,45)
end
[code/]
end
end

]

[Zulsorai]

The first thing I would do off the top off my head would to use a simple aabb collision function. If you know the x and y position of the box and have it at a set width and height then you can do something like:

Code: Select all

if mx >= x and mx <= x + width then
    if my >= y and my < y + height then
        -- Do whatever here
    end
end

The mx and my of course being the mouse position and the x, y, width, and height all coming from what you want to check it againts. Hopefully thats enough to help you figure everything out.

Cheers

[silverknight108]

not really enough how would i get the x and y of the grid boxes and find out which one is the one being clicked

[Zulsorai]

Looking at the code you posted you get the x and y position saved as block[x][y] multiplied by 45 (The same way you are drawing it)
Without a .love thats really all I can do. Hopefully this makes sense.

[Luke100000]

Code: Select all

function dg()
h,w = love.window.getHeight,love.window.getWidth
bloks = {}
for x = 0,12 do
bloks[x] = {}
for y = 0,12 do
 bloks[x][y] = {}
 bloks[x][y] = love.graphics.rectangle("line",x*45,y*45,45,45)
end
[code/]
end
end

function love.mousepressed(x, y, button)
    local blokSize = 45 --like the rectangle in dg()
    local blokX, blokY = math.floor(x/blokSize), math.floor(y/blokSize)
   --now you have the position of the selected block
    if button == "l" then --left mousebutton
        --change color
    end
end

You don't need to check every "blok" if it is selected, because only one at time can be the one.
I hope I understood you question and helped you...