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Moving sprite toward mouse
Posted: Sun Jan 02, 2011 12:20 am
by danlthemanl
I'm not quite sure how to do this. I've tried all I can and nothing seems to work. It must be some kind of math that I am not familiar with?
Re: Moving sprite toward mouse
Posted: Sun Jan 02, 2011 12:52 am
by TechnoCat
danlthemanl wrote:I'm not quite sure how to do this. I've tried all I can and nothing seems to work. It must be some kind of math that I am not familiar with?
If you split it into X and Y then it becomes very easy algebra. Just test and move accordingly.
However, if you want a constant speed, you will need to use some linear algebra. Finding the x and y component from mouse to sprite and then getting the normalized vector of that.
Re: Moving sprite toward mouse
Posted: Sun Jan 02, 2011 1:13 am
by Robin
In pseudocode:
Code: Select all
image.x = image.x + difference between mouse_x and image.x times a factor < 1
image.y = image.y + difference between mouse_y and image.y times a factor < 1
Re: Moving sprite toward mouse
Posted: Sun Jan 02, 2011 1:43 am
by danlthemanl
I'm still not getting it. Whatever I do the sprite always moves in an angle, i can't get it to move toward the mouse!
this is what i have:
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-- In load
PlayerX = 400
PlayerY = 300
PlayerVel = -0.2
if love.mouse.isDown("l") then
mouseX = love.mouse.getPosition(x)
mouseY = love.mouse.getPosition(y)
diffX = PlayerX / mouseX - 1
diffY = PlayerY / mouseY - 1
PlayerX = PlayerX + diffX * PlayerVel
PlayerY = PlayerY + diffY * PlayerVel
end
and it just moves at an angle.
Re: Moving sprite toward mouse
Posted: Sun Jan 02, 2011 2:11 am
by tentus
Change
Code: Select all
mouseX = love.mouse.getPosition(x)
mouseY = love.mouse.getPosition(y)
to
Code: Select all
mouseX,mouseY = love.mouse.getPosition()
love.mouse.getPosition() returns to values in a specific order, you can't tell it to give you a single value.
Re: Moving sprite toward mouse
Posted: Sun Jan 02, 2011 2:24 am
by TechnoCat