How to achieve a player that is not just a rectangle

问题

My goal is to achieve a player that is not just a rectangle.

This is my love.load and love.draw:

local AdvTiledLoader = require("AdvTiledLoader.Loader")
require("camera")

function love.load()
love.graphics.setBackgroundColor( 204, 255, 204 )
AdvTiledLoader.path = "maps/"
map = AdvTiledLoader.load("map.tmx")
map:setDrawRange(0, 0, map.width * map.tileWidth, map.height * map.tileHeight)

camera:setBounds(0, 0, map.width * map.tileWidth - love.graphics.getWidth(), map.height * map.tileHeight - love.graphics.getHeight() )

world =     {
            gravity = 1536,
            ground = 512,
            }

player =    {
            x = 256,
            y = 256,
            x_vel = 0,
            y_vel = 0,
            jump_vel = -1024,
            speed = 512,
            flySpeed = 700,
            state = "",
            h = 32,
            w = 32,
            standing = false,
            }
function player:jump()
    if self.standing then
        self.y_vel = self.jump_vel
        self.standing = false
    end
end

function player:right()
    self.x_vel = self.speed
end

function player:left()
    self.x_vel = -1 * (self.speed)
end

function player:stop()
    self.x_vel = 0
end

function player:collide(event)
    if event == "floor" then
        self.y_vel = 0
        self.standing = true
    end
    if event == "cieling" then
        self.y_vel = 0
    end
end

function player:update(dt)
    local halfX = self.w / 2
    local halfY = self.h / 2

    self.y_vel = self.y_vel + (world.gravity * dt)

    self.x_vel = math.clamp(self.x_vel, -self.speed, self.speed)
    self.y_vel = math.clamp(self.y_vel, -self.flySpeed, self.flySpeed)

    local nextY = self.y + (self.y_vel*dt)
    if self.y_vel < 0 then
        if not (self:isColliding(map, self.x - halfX, nextY - halfY))
            and not (self:isColliding(map, self.x + halfX - 1, nextY - halfY)) then
            self.y = nextY
            self.standing = false
        else
            self.y = nextY + map.tileHeight - ((nextY - halfY) % map.tileHeight)
            self:collide("cieling")
        end
    end
    if self.y_vel > 0 then
        if not (self:isColliding(map, self.x-halfX, nextY + halfY))
            and not(self:isColliding(map, self.x + halfX - 1, nextY + halfY)) then
                self.y = nextY
                self.standing = false
        else
            self.y = nextY - ((nextY + halfY) % map.tileHeight)
            self:collide("floor")
        end
    end

    local nextX = self.x + (self.x_vel * dt)
    if self.x_vel > 0 then
        if not(self:isColliding(map, nextX + halfX, self.y - halfY))
            and not(self:isColliding(map, nextX + halfX, self.y + halfY - 1)) then
            self.x = nextX
        else
            self.x = nextX - ((nextX + halfX) % map.tileWidth)
        end
    elseif self.x_vel < 0 then
        if not(self:isColliding(map, nextX - halfX, self.y - halfY))
            and not(self:isColliding(map, nextX - halfX, self.y + halfY - 1)) then
            self.x = nextX
        else
            self.x = nextX + map.tileWidth - ((nextX - halfX) % map.tileWidth)
        end
    end

    self.state = self:getState()
end

function player:isColliding(map, x, y)
    local layer = map.tl["Solid"]
    local tileX, tileY = math.floor(x / map.tileWidth), math.floor(y / map.tileHeight)
    local tile = layer.tileData(tileX, tileY)
    return not(tile == nil)
end

function player:getState()
    local tempState = ""
    if self.standing then
        if self.x_vel > 0 then
            tempState = "right"
        elseif self.x_vel < 0 then
            tempState = "left"
        else
            tampState = "stand"
        end
    end
    if self.y_vel > 0 then
        tempState = "fall"
    elseif self.y_vel < 0 then
        tempState = "jump"
    end
    return tempState
end
end

function love.draw()
camera:set()

love.graphics.setColor( 255, 161, 65 )
love.graphics.rectangle("fill", player.x - player.w/2, player.y - player.h/2, player.w, player.h)

love.graphics.setColor( 255, 255, 255 )
map:draw()

camera:unset()
end

function love.update(dt)
if dt > 0.05 then
    dt = 0.05
end
if love.keyboard.isDown("d") then
    player:right()
end
if love.keyboard.isDown("a") then
    player:left()
end
if love.keyboard.isDown(" ") and not(hasJumped) then
    player:jump()
end

player:update(dt)

camera:setPosition( player.x - (love.graphics.getWidth()/2), player.y - (love.graphics.getHeight()/2))
end

function love.keyreleased(key)
if (key == "a") or (key == "d") then
    player.x_vel = 0
end
end

回答1:

If you're looking to have your player appear as something other than a rectangle, you might want to have a look at the documentation for LOVE's graphics module.

Right now, you're just calling love.graphics.rectangle(...) to draw the player, but you've got a lot of options:

For instance, if you wanted to have your player appear as the image someimage.png (which must be in the same directory as your game) you'd have to take two steps:

In your love.load handler, you should create the image object and store it somewhere.
```
myimage = love.graphics.newImage("someimage.png")
```
In your love.draw handler, you should draw that image at the appropriate position.
```
love.graphics.draw( myimage, player.x, player.y )
```

It's important that you load the image once (in love.load) and not every frame.

LOVE has a lot of flexbility when it comes to drawing, so I'd recommend you read up on all the different drawing tools you have in love.graphics.

Take a look at:

love.graphics.draw
Image
and anything else of interest in the love.graphics documentation. (linked above)

来源：https://stackoverflow.com/questions/19886055/how-to-achieve-a-player-that-is-not-just-a-rectangle

标签

lua

love2d