130 lines
4.6 KiB
Lua
130 lines
4.6 KiB
Lua
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local DEFAULT_PLATFORM_COLOR = {255,255,255}
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local GRAVITY_CONSTANT = 100
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local AIR_RES_CONSTANT = 1
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local VERY_SMALL_NUM = 0.01
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local function platform_below_platform (platform, system)
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return system:isPointOccupied(platform.x, platform.y + platform.h + VERY_SMALL_NUM, platform) or system:isPointOccupied(platform.x + platform.w, platform.y + platform.h + VERY_SMALL_NUM, platform)
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end
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--------------------------------------------------------------------------------
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local PlayerController = {}
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PlayerController.__index = PlayerController
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function PlayerController.new (target, controls)
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assert(controls.jump and controls.left and controls.right )
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local self = setmetatable({}, PlayerController)
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self.target = target
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self.controls = controls
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return self
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end
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function PlayerController:update (dt, system)
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local not_jumping = platform_below_platform(self.target, system)
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if love.keyboard.isDown( self.controls.jump ) and not_jumping then
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self.target.dy = - 220
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elseif love.keyboard.isDown( self.controls.left ) then
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self.target.dx = self.target.dx - 15
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elseif love.keyboard.isDown( self.controls.right ) then
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self.target.dx = self.target.dx + 15
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end
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end
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--------------------------------------------------------------------------------
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local Platform = {}
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Platform.__index = Platform
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function Platform.new (t)
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local self = setmetatable(t, Platform)
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assert(self.x and self.y and self.w and self.y)
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self.color = self.color or DEFAULT_PLATFORM_COLOR
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return self
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end
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--------------------------------------------------------------------------------
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local PlatformSystem = {}
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PlatformSystem.__index = PlatformSystem
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function PlatformSystem.new ()
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local self = setmetatable({}, PlatformSystem)
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self.platforms = {}
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self.controllers = {}
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return self
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end
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function PlatformSystem:addPlatform (x, y, w, h)
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self.platforms[#self.platforms + 1] = Platform.new {
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x = x, y = y, w = w, h = h
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}
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end
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function PlatformSystem:addPlayer ( x, y, w, h, controls )
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local platform = Platform.new {
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x = x, y = y, w = w, h = h,
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movable = true, dx = 0, dy = 0
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}
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self.platforms[#self.platforms + 1] = platform
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self.controllers[#self.controllers + 1] = PlayerController.new(platform, controls)
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return platform
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end
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function PlatformSystem:isPointOccupied (x, y, except)
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for _, platform in ipairs(self.platforms) do
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if platform.x <= x and x <= platform.x + platform.w and platform.y <= y and y <= platform.y + platform.h and platform ~= except then
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return platform
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end
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end
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return false
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end
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function PlatformSystem:updatePlatform (platform, dt)
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local ndx, ndy = platform.dx * (1 - AIR_RES_CONSTANT * dt), platform.dy + GRAVITY_CONSTANT * dt
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local nx, ny = platform.x + ndx * dt, platform.y + ndy * dt
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if true then
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if not self:isPointOccupied(platform.x, ny, platform) and not self:isPointOccupied(platform.x + platform.w, ny, platform) and not self:isPointOccupied(platform.x, ny + platform.h, platform) and not self:isPointOccupied(platform.x + platform.w, ny + platform.h, platform) then
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platform.y, platform.dy = ny, ndy
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else
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ndx = ndx * (1 - AIR_RES_CONSTANT * dt)
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platform.dy = 0
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end
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if not self:isPointOccupied(nx, platform.y, platform) and not self:isPointOccupied(nx + platform.w, platform.y, platform) and not self:isPointOccupied(nx, platform.y + platform.h, platform) and not self:isPointOccupied(nx + platform.w, platform.y + platform.h, platform) then
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platform.x, platform.dx = nx, ndx
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else
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platform.dx = 0
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end
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end
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end
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function PlatformSystem:update (dt)
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-- Update movable platforms
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for _, platform in ipairs(self.platforms) do
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if platform.movable then
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platform.moved = self:updatePlatform(platform, dt) or self:updatePlatform(platform, dt * 0.5) or self:updatePlatform(platform, dt * 0.25)
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end
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end
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-- Update controllers
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for _, controller in ipairs(self.controllers) do
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controller:update(dt, self)
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end
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end
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function PlatformSystem:draw (dt, offset_x, offset_y)
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local offset_x, offset_y = offset_x or 0, offset_y or 0
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for _, platform in ipairs(self.platforms) do
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love.graphics.setColor(platform.color)
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love.graphics.rectangle('fill', platform.x - offset_y, platform.y - offset_x, platform.w, platform.h)
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end
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end
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--------------------------------------------------------------------------------
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return {
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PlatformSystem = PlatformSystem,
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Player = Player,
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}
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