Newbie question about speed of game

[mediakitchen]

Another newbie question.

Only been using Love for a couple of hours and playing around with a simple penalty shootout game idea.

I have managed to work out to detect when the mouse clicks the ball (thanks to help) and I am also able to launch the ball when the mouse is released. I have set the speed of my ball to 1 pixel in the horizontal direction but notice is is flying across the screen.

I would therefore like advice on how best to control the speed of the ball. Do I need to set up some sort of timer, or can I change the FPS or do I just need to change the speed to a smaller value (i.e a decimal less than one).

Thanks

Paul

Here is my entire code so far

Code: Select all

function love.load()
   ball = love.graphics.newImage("ball.png")
   ballx = 100
   bally = 400
   ballHorizontalVelocity = 0
   ballVerticalVelocity = 0
   arrow = love.graphics.newImage("arrow.png")
   arrowx = 150
   arrowy = 150
end

function love.draw()
    love.graphics.draw(ball, ballx, bally)
    love.graphics.draw(arrow, arrowx, arrowy)
   

  
end

function love.update(dt)

	ballx = ballx + ballHorizontalVelocity

end


function love.mousepressed(x, y, button)

   -- Calculate if mouse over ball
   -- i.e distance squared less than radius squared

   local ballRadiusSquared = 900 -- 30 x 30

   if button == 'l' then

      local distanceSquared = distanceSquaredFrom(x,y,ballx + 30,bally + 30)

	if distanceSquared <= ballRadiusSquared then

		arrowx = ballx + 30 -- move arrow to center of ball clicked
      		arrowy = bally + 30 - 7

        end
   end
end


function love.mousereleased(x, y, button)
   if button == 'l' then
      kickBall(x,y) 
   end
end


function kickBall(x,y)
	ballHorizontalVelocity = 1

end



function distanceSquaredFrom(x1,y1,x2,y2)
   return (x2 - x1) ^ 2 + (y2 - y1) ^ 2
end

[mediakitchen]

Following up my previous post I added the following code inside the love.draw function and I am getting a value of around 900. Does that mean I am getting a FPS this high?

Code: Select all

love.graphics.print(love.timer.getFPS( ), 300,300)

[Thursdaybloom]

Try this:

Code: Select all

function love.update(dt)

   ballx = ballx + ballHorizontalVelocity * dt

end

dt is delta time, which is "Time since the last update in seconds". This will help things run at the same speed regardless of how fast their computer is

[mediakitchen]

Thanks ThursdayBloom

That works a treat.

Many thanks

Paul