How can I make my character jump?

[BEANSFTW]

Hi. I'm working on a platformer game, but I can't figure out how to make my character jump.

Here's my code

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function love.load()

	
  
	player = love.graphics.newImage("assets/player.png")
 
	playerx = 270
  
	playery = 420
  
	bg = love.graphics.newImage("assets/backround.png")
  
	-- music
	music = love.audio.newSource( "assets/music.ogg" , "steam")
	music:setLooping(true)
	love.audio.play(music)
  
	Cloudx = 0
  
    yCloud = 128
  
	cloudimage = love.graphics.newImage("assets/cloud.gif")
	bullet = love.graphics.newImage("assets/bullet.gif")
	
	right = love.graphics.newImage("assets/player.png")
	left = love.graphics.newImage("assets/playerback.png")
  
	
end


function love.update(dt)
 


	Cloudx =  Cloudx + 32*dt 
	if Cloudx >= (900 + 278) then
		Cloudx = 0
	end

	
	
	if love.keyboard.isDown("d") then
		playerx = playerx + 275*dt
		player = right
	end	

	if love.keyboard.isDown("s") then
		playery = playery + 675*dt
	end
	
	
	
	if love.keyboard.isDown("a") then
		player = left
		playerx = playerx - 275*dt
	end	
	
	
	if playery > 420 then
		playery = 420
	end	
	
		
end

function love.draw()
  
	
	
	
	love.graphics.setColor(40,255,40)
    love.graphics.rectangle("fill", 0, 0, love.graphics.getWidth(), love.graphics.getHeight())
    love.graphics.setColor(255,255,255)
  
  
    love.graphics.setColor(111,183,255)
	love.graphics.rectangle("fill",0,0,love.graphics.getWidth(),450)
	love.graphics.setColor(255,255,255)
  
	
	
	love.graphics.draw(cloudimage, Cloudx - 278, 128)
	
	
	
	love.graphics.draw(player, playerx, playery)
end

[Refpeuk]

This is probably one of the most commonly asked mechanical questions on this forum. Try the handy search function.

[tentus]

Also, you can replace this:

Code: Select all

   love.graphics.setColor(40,255,40)
    love.graphics.rectangle("fill", 0, 0, love.graphics.getWidth(), love.graphics.getHeight())
   love.graphics.setColor(255,255,255)

with this, inside of love.load:

Code: Select all

love.graphics.setBackgroundColor(40,255,40)

[Puzzlem00n]

Well, I can give you my method of choice if you'd like.

Code: Select all

function love.load()
	player = {
		x = 280,
		y = 380,
		ySpeed = 0, -- the Speed we'll add to the Y movement
		gravSecond = 1.5 -- gravity amount
		}
end

function love.keypressed(key)
	if key == "up" and player.y < 400 then -- Are we on the ground?
		player.ySpeed = -20 -- Make us add a negative, to move up
	end
end

function love.update(dt)
	frame = dt * 30 -- I do this just because I think better this way
	player.ySpeed = player.ySpeed + player.gravSecond * frame -- We add gravity to the ySpeed
	player.y = player.y + player.ySpeed * frame -- We add ySpeed to the player's y position
	if player.y > 400 then -- Are we on the ground?
		player.y = player.y - player.ySpeed * frame -- If we are, We undo that moving down
		player.ySpeed = 0 -- The ySpeed is reset
	end
end



function love.draw()
		love.graphics.rectangle("fill", player.x, player.y, 40, 40) -- Draw it!
end

That make sense?

[BEANSFTW]

I don't get it. Plus, Theres a problem where I can jump in mid air as much times as I want.

[Qcode]

I can't really help you understand but I can add something to puzzlem00n's code to stop that bug.

All I do is make a variable like "inAir" and add it to the player table.

Code: Select all

function love.load()
   player = {
      x = 280,
      y = 380,
      ySpeed = 0, -- the Speed we'll add to the Y movement
      gravSecond = 1.5, -- gravity amount
      inAir = false
      }
end

Then after that set it so when he jumps the player.inAir = true

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function love.keypressed(key)
   if key == "up" and player.y < 400 and not player.inAir then -- Are we on the ground?
      player.ySpeed = -20 -- Make us add a negative, to move up
      player.inAir = true
   end
end

Then we also have to set if so that when we land we are not "inAir"

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function love.update(dt)
   frame = dt * 30 -- I do this just because I think better this way
   player.ySpeed = player.ySpeed + player.gravSecond * frame -- We add gravity to the ySpeed
   player.y = player.y + player.ySpeed * frame -- We add ySpeed to the player's y position
   if player.y > 400 then -- Are we on the ground?
      player.y = player.y - player.ySpeed * frame -- If we are, We undo that moving down
      player.ySpeed = 0 -- The ySpeed is reset
      player.inAir = false
   end
end

And that should be all. Here's the code with the modifications in full.

Code: Select all

function love.load()
   player = {
      x = 280,
      y = 380,
      ySpeed = 0, -- the Speed we'll add to the Y movement
      gravSecond = 1.5, -- gravity amount
      inAir = false
      }
end

function love.keypressed(key)
   if key == "up" and player.y < 400 and not player.inAir   then -- Are we on the ground?
      player.ySpeed = -20 -- Make us add a negative, to move up
      player.inAir = true
   end
end

function love.update(dt)
   frame = dt * 30 -- I do this just because I think better this way
   player.ySpeed = player.ySpeed + player.gravSecond * frame -- We add gravity to the ySpeed
   player.y = player.y + player.ySpeed * frame -- We add ySpeed to the player's y position
   if player.y > 400 then -- Are we on the ground?
      player.y = player.y - player.ySpeed * frame -- If we are, We undo that moving down
      player.ySpeed = 0 -- The ySpeed is reset
      player.inAir = false
   end
end



function love.draw()
      love.graphics.rectangle("fill", player.x, player.y, 40, 40) -- Draw it!
end

Hopefully that helps

Qcode

[BEANSFTW]

it works!
Thanks for the help

[Refpeuk]

So sorry for my rather short and rude reply. Moral: never browse forums in a bad mood.

[Puzzlem00n]

STOP THE PRESSES! I think I have a better fix for this.

Code: Select all

function love.load()
	player = {
		x = 280,
		y = 380,
		ySpeed = 0, -- the Speed we'll add to the Y movement
		gravSecond = 1.5 -- gravity amount
		}
end

function love.update(dt)
	frame = dt * 30 -- I do this just because I think better this way
	player.ySpeed = player.ySpeed + player.gravSecond * frame -- We add gravity to the ySpeed
	player.y = player.y + player.ySpeed * frame -- We add ySpeed to the player's y position
	if player.y > 400 then -- Are we on the ground?
		player.y = player.y - player.ySpeed * frame -- If we are, We undo that moving down
		player.ySpeed = 0 -- The ySpeed is reset
	end
	if love.keyboard.isDown("up") and player.ySpeed == 0 then -- Should we be jumping, and can we?
		--This works because the ySpeed is only zero when we aren't already jumping.
		player.ySpeed = -20 -- Make us add a negative, to move up
	end
end

function love.draw()
		love.graphics.rectangle("fill", player.x, player.y, 40, 40) -- Draw it!
end

That way you don't have to mess with booleans, which I prefer to avoid.

[Puzzlem00n]

P.S. If you don't get it, I'd be happy to make a longer, more tutorial-ish explanation, if you want.