LÖVE

Posted: **Sun Jun 01, 2014 6:29 pm**

First off, i want to say sorry if there is already a thred on this (I know there is some where) but I've spent 30 minuets already looking for it. So here is my question, I want to simulate a command (if statement) when the mosue has clicked on a object. How would I do this?

Posted: **Sun Jun 01, 2014 9:38 pm**

You probably didn't find anything in your search because there is so many ways to do this...

The basic, simplest way I can currently think of is this:
In love.mousepressed, check if the mouse was inside the region which is also the region where the object currently is.
If so, call the function.

Here's a quick example. This should make the rectangle change color every time it's clicked (not tested)

Code: Select all


local object = { x = 10, y = 20, width = 100, height = 50, color = 0 }

function love.mousepressed( x, y, button )
    -- Check if the click is inside the object:
    if x > object.x and y > object.y and x < object.x + object.width and y < object.y + object.height then
        switchObjectColor()
    end
end

function switchObjectColor()
    if object.color == 0 then
        object.color = 1
    else
        object.color = 0
    end
end

function love.draw()
    if object.color = 0 then
        love.graphics.setColor( 255, 0, 0, 255 )
    else
        love.graphics.setColor( 0, 255, 0, 255 )
    end
    love.graphics.rectangle( "fill", object.x, object.y, object.width, object.height)
end

Edit:
P.S. Welcome to the forums!

Posted: **Sun Jun 01, 2014 9:40 pm**

Basically, you treat it similarly to how you would treat collisions in gameplay.

Assuming the object you want to check for collision with the mouse is a rectangle, for example a button, here's a function you could use to check for collision between a point (the mouse position) and a rectangle (the button):

Code: Select all

function pointRectangleCollide(pointX, pointY, rectangleX, rectangleY, rectangleWidth, rectangleHeight)
	left = rectangleX
	right = left + rectangleWidth
	top = rectangleY
	bottom = top + rectangleHeight

	return
		left <= pointX and
		top <= pointY and
		pointX <= right and
		pointY <= bottom
end

What this function does is check if the point is

- To the right of the left line of the rectangle,
- Below the top line of the rectangle,
- To the left of the right line of the rectangle,
- And above the bottom line of the rectangle.

If all is true, then the point is inside the rectangle, and therefore colliding. Only in this case, the function above returns true.

Other shapes, such as rotated rectangles, are more complicated - I suggest you to read up 2D collisions on the internet if you want to learn more.

Posted: **Sun Jun 01, 2014 11:33 pm**

thank you so much for your responses! also, I am very sorry about the errors in the post, I was typing quickly, and shortly found out that my keyboard became unresponsive

still, no excuse for ill grammar. Thank you for your warm welcome to!

LÖVE

ouse clicked object

ouse clicked object

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