Is realistic jumping even possibru without love.physics ?
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Is realistic jumping even possibru without love.physics ?
I looking through a dozen of games by now. But the easiest way I found was in mario 7.2 and that used love.physics. So by now I'm using Hardon Collider and Pixel movement. Would be any good to use love.physics or should I just use another method?
Re: Is realistic jumping even possibru without love.physics
it's easily achieved. You have a yvelocity, and every 0.1 second this yvelocity goes up with +0.1, then update the position of the thing + yvelocity. When the thing has to jump you change the yvelocity to like -5!
(the numbers i named will not achieve a good looking jump effect, you have to change it a little)
(the numbers i named will not achieve a good looking jump effect, you have to change it a little)
Re: Is realistic jumping even possibru without love.physics
I extracted this from your text, but I made something terribly wrong, would you mind helping me?
Code: Select all
player.velocity.y = 0.1 * dt
if player.velocity.y == 10 then
player.velocity.y = -5
end
- Metalcookie
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Re: Is realistic jumping even possibru without love.physics
I think it's more like this:Jack5500 wrote:I extracted this from your text, but I made something terribly wrong, would you mind helping me?
Code: Select all
player.velocity.y = player.velocity.y + 0.1 * dt --each second the velocity is increased by 0.1
player.y = player.y + player.velocity.y --moves the player with the calculated velocity
- tentus
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Re: Is realistic jumping even possibru without love.physics
Here's an example program that should be pretty extensible. Sorry it's not very pretty, but I didn't want any excess code confusing anyone.
Code: Select all
function love.load()
player = {
x = 400,
y = 480,
w = 20,
h = 20,
v = false -- not just 0 velocity, but NO velocity at all
}
ground = {
x = 0,
y = 500,
w = 800,
h = 100
}
initial = -200 -- start with an upward (negative) for of 200 px per second
gravity = 50 -- we gain 50 px of gravitational thrust per second
end
function love.update(dt)
if player.v then
player.v = player.v + (gravity * dt)
player.y = player.y + (player.v * dt)
end
if player.y + player.h >= ground.y then
player.y = ground.y - player.h
player.v = false
end
end
function love.draw()
love.graphics.rectangle("fill", player.x, player.y, player.w, player.h)
love.graphics.rectangle("fill", ground.x, ground.y, ground.w, ground.h)
end
function love.keypressed()
if not player.v then -- can't jump if we're already jumping
player.v = initial
end
end
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Re: Is realistic jumping even possibru without love.physics
Okay if I understand your code right, this part...
...calculates the movement speed per "update" and this part...
...stops it when it touches the ground. Or am I wrong?
Code: Select all
if player.v then
player.v = player.v + (gravity * dt)
player.y = player.y + (player.v * dt)
end
Code: Select all
if player.y + player.h >= ground.y then
player.y = ground.y - player.h
player.v = false
end
- tentus
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Re: Is realistic jumping even possibru without love.physics
Yep!Jack5500 wrote:Okay if I understand your code right, this part...
...calculates the movement speed per "update" and this part...Code: Select all
if player.v then player.v = player.v + (gravity * dt) player.y = player.y + (player.v * dt) end
...stops it when it touches the ground. Or am I wrong?Code: Select all
if player.y + player.h >= ground.y then player.y = ground.y - player.h player.v = false end
Kurosuke needs beta testers
Re: Is realistic jumping even possibru without love.physics
That means you just made HC completly unneccessary. I'm thinking about removeing it, since those too are interfering, because I created the player and the player.box now. IT's all achieveable without it, am i right?
- Taehl
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Re: Is realistic jumping even possibru without love.physics
You can do anything you want. Things like Box2D, HardonCollider, and such are things you could fully remake if you desired - they're just there to try to make it easier for you.
My game Underlife is a platformer, and doesn't use any physics library. Here's a trimmed-down version of what I have:(Note: This isn't something you can copy-paste into your game and expect it to work - it's custom-tailored to Underlife. It's an example, not a solution)
My game Underlife is a platformer, and doesn't use any physics library. Here's a trimmed-down version of what I have:
Code: Select all
pc = {x=0,y=0, xv=0,yv=0 } -- player character has a position and velocity
local maxSpeed = 28.9999 -- terminal velocity, in meters per second
local framerate = 1/58 -- 1/58 is based on maxSpeed (must move less than .5 in an update to prevent penetration in my engine)
local p = pc -- not only saves me a little typing, but also gives a minuscule performance boost!
function pc.update(dt)
local accum = dt
while accum > 0 do -- accumulator for physics! no more penetration!
local dt = math.min( framerate, accum )
accum = accum - dt
do -- normal movement
if not p.falling then -- touching the ground
if control.tap.jump then p.xv, p.yv = p.xv+control.horiz*4, (control.vert-.875)*5.5 end -- jumping
p.xv = p.xv + control.horiz*30*(control.walk and .4 or 1)*(p.resetX and 0 or 1) * dt -- running
p.xv = p.xv*(1-dt*(p.crawling and 10 or 4)) -- horizontal friction
else
p.xv = p.xv*.99 + control.horiz*5*dt -- air control
end
end
do -- collision
-- Underlife is tile-based, and tiles are stored in form of map[x][y] = something if there's a tile, or nil if not (where x and y are integers)
p.falling = true
p.yv = math.clamp(-maxSpeed, p.yv+30*dt, maxSpeed) -- gravity
p.xv = math.clamp(-maxSpeed, p.xv, maxSpeed)
-- vertical
p.y = p.y + p.yv * dt
if map[math.round(p.x-.1)][math.ceil(p.y)] or map[math.round(p.x+.1)][math.ceil(p.y)] then
p.falling, p.y, p.yv = false, p.y-(p.y-math.round(p.y)), 0
end
if not p.crawling and map[math.round(p.x-.15)][math.floor(p.y-1)] or map[math.round(p.x+.15)][math.floor(p.y-1)] then
p.y, p.yv = p.y+(math.round(p.y)-p.y), 0
end
-- horizontal
p.x = p.x + p.xv * dt
if map[math.floor(p.x)][math.round(p.y)] then p.x, p.xv = math.ceil(p.x), p.falling and p.xv*-.1 or 0 end
if map[math.ceil(p.x)][math.round(p.y)] then p.x, p.xv = math.floor(p.x), p.falling and p.xv*-.1 or 0 end
if not p.crawling then
if map[math.floor(p.x)][math.round(p.y-1)] then p.x, p.xv = math.ceil(p.x), p.falling and p.xv*-.1 or 0 end
if map[math.ceil(p.x)][math.round(p.y-1)] then p.x, p.xv = math.floor(p.x), p.falling and p.xv*-.1 or 0 end
end
-- corner pushers (you slip off of corners, instead of standing on them Mario-style)
if p.falling then
if map[math.floor(p.x)][math.ceil(p.y)] then p.x = p.x + 2*dt end
if map[math.ceil(p.x)][math.ceil(p.y)] then p.x = p.x - 2*dt end
end
end
end
end
Earliest Love2D supporter who can't Love anymore. Let me disable pixel shaders if I don't use them, dammit!
Lenovo Thinkpad X60 Tablet, built like a tank. But not fancy enough for Love2D 0.10.0+.
Lenovo Thinkpad X60 Tablet, built like a tank. But not fancy enough for Love2D 0.10.0+.
Re: Is realistic jumping even possibru without love.physics
Somehow the code seems not to work. The jump isn't performed at all. Where did i go wrong?
Code: Select all
HC = require"libs"
--function to deal with collides (duh)
function on_collide (dt, shape_a, shape_b)
ground_touched = false
--Who is who?
local ground
if shape_a == player then
ground = shape_b
ground_touched = true
else ground = shape_a
end
local bx, by = player:center()
local px,py = ground:center()
player.velocity.y = 0
player.velocity.x = 0 --not sure if that might interfere :/
end
function love.load()
Collider = HC(100, on_collide)
-- credit to tentus
player_box = {
x = 400,
y = 0,
w = 25,
h = 75,
v = false -- not just 0 thrust, but NO thrust at all
}
ground_box = {
x = 0,
y = 535,
w = 800,
h = 20
}
initial = -200 -- start with an upward for of 200 px per second
falloff = -50 -- we lose 50 px of upward thrust per second
player = Collider:addRectangle(player_box.x,player_box.y, player_box.w, player_box.h)
ground = Collider:addRectangle(ground_box.x, ground_box.y, ground_box.w, ground_box.h)
player.velocity = {x=0, y=300}
Tileset = love.graphics.newImage('images/foresttiles01.png')
TileW, TileH = 60,60
local tilesetW, tilesetH = Tileset:getWidth(),Tileset:getHeight()
love.graphics.setBackgroundColor( 54, 54, 54)
local quadInfo = {
{ 'a', 0, 300 }, -- air
{ '#', 60, 0 }, -- grass
{ '*', 60, 120 }, -- flowers
{ '^', 120, 120 }, -- other flowers
{ 'g', 0, 0 } --other grass
}
Quads={}
for _,info in ipairs(quadInfo) do
-- info[1] = character, info[2]= x, info[3] = y
Quads[info[1]] = love.graphics.newQuad(info[2], info[3], TileW, TileH, tilesetW, tilesetH)
end
--Map Tile Layout
local tileString = [[
aaaaaaaaaaaaaa
aaaaaaaaaaaaaa
aaaaaaaaaaaaaa
aaaaaaaaaaaaaa
aaaaaaaaaaaaaa
aaaaaaaaaaaaaa
aaaaaaaaaaaaaa
aaaaaaaaaaaaaa
*^^***^^**^^**
#g#g#g#g#g#g#g
]]
-- Translate the characters into the right tile parts of the Tileset
TileTable = {}
local width = #(tileString:match("[^\n]+"))
for x = 1,width,1 do TileTable[x] = {} end
local rowIndex,columnIndex = 1,1
for row in tileString:gmatch("[^\n]+") do
assert(#row == width, 'Map is not aligned: width of row ' .. tostring(rowIndex) .. ' should be ' .. tostring(width) .. ', but it is ' .. tostring(#row))
columnIndex = 1
for character in row:gmatch(".") do
TileTable[columnIndex][rowIndex] = character
columnIndex = columnIndex + 1
end
rowIndex=rowIndex+1
end
end
function love.update(dt)
xc = love.mouse.getX( )
yc = love.mouse.getY( )
player:move(player.velocity.x * dt, player.velocity.y *dt)
if player_box.v then --movement per update
player_box.y = player_box.v - (falloff * dt)
player_box.v = player_box.y + (player_box.v * dt)
end
if player_box.y + player_box.h >= player_box.y then -- stop the box when touching ground
player_box.y = player_box.y - player_box.h
player_box.v = false
end
if love.keyboard.isDown('w') then
--player:move(0, -100 * dt)
if not player.v then -- can't jump if we're already jumping
player.v = initial
end
ground_touched = false
elseif love.keyboard.isDown('s') and ground_touched == false then
player:move(0, 100 * dt)
elseif love.keyboard.isDown('a') then
player:move(-10, 0 * dt)
ground_touched = false
elseif love.keyboard.isDown('d') then
player:move(10, 0 * dt)
ground_touched = false
end
Collider:update(dt)
end
function love.draw()
--Hadron Collider
player:draw('fill')
ground:draw('fill')
local lg = love.graphics
lg.print("FPS: "..love.timer.getFPS(), 8,8)
lg.print("Mouse X:" ..xc, 10, 18)
lg.print("Mouse Y" ..yc, 10, 28)
for columnIndex,column in ipairs(TileTable) do
for rowIndex,char in ipairs(column) do
local x,y = (columnIndex-1)*TileW, (rowIndex-1)*TileH
love.graphics.drawq(Tileset, Quads[char], x, y)
end
end
local lg = love.graphics
lg.setColor(255,255,255, 255)
end
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