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Updates game.lua, to prevent cursor flying across the screen on fast CPU #4

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Updates game.lua, to prevent cursor flying across the screen on fast CPU #4

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31 changes: 26 additions & 5 deletions game.lua
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Original file line number Diff line number Diff line change
@@ -1,5 +1,10 @@
game = class('game')

-- CONSTANTS
ORIGINAL_STEP_SIZE = 8 -- this is excessively fast on a modern computer
-- anything above is dangerously fast, as it makes the cursor fly across screen
FPS_DANGER = 60

function game:initialize()

self.screen = {}
Expand Down Expand Up @@ -118,25 +123,41 @@ function game:update(dt)
end

if love.keyboard.isDown('up') and self.cursor.y > 0 then
self.cursor.y = self.cursor.y - 8
local fps = love.timer.getFPS()
if fps > FPS_DANGER then
local step_size = ORIGINAL_STEP_SIZE / love.timer.getFPS() * 60
self.cursor.y = self.cursor.y - step_size
end
elseif self.cursor.y < 0 then
self.cursor.y = 0
end

if love.keyboard.isDown('right') and self.cursor.x < self.screen.width then
self.cursor.x = self.cursor.x + 8
local fps = love.timer.getFPS()
if fps > FPS_DANGER then
local step_size = ORIGINAL_STEP_SIZE / love.timer.getFPS() * 60
self.cursor.x = self.cursor.x + step_size
end
elseif self.cursor.x > self.screen.width then
self.cursor.x = self.screen.width
end

if love.keyboard.isDown('down') and self.cursor.y < (self.bombtower.y - self.cursor.height) then
self.cursor.y = self.cursor.y + self.cursor.height
local fps = love.timer.getFPS()
if fps > FPS_DANGER then
local step_size = ORIGINAL_STEP_SIZE / love.timer.getFPS() * 60
self.cursor.y = self.cursor.y + step_size
end
elseif self.cursor.y > self.bombtower.y then
self.cursor.y = self.bombtower.y
end

if love.keyboard.isDown('left') and self.cursor.x > 0 then
self.cursor.x = self.cursor.x - 8
local fps = love.timer.getFPS()
if fps > FPS_DANGER then
local step_size = ORIGINAL_STEP_SIZE / love.timer.getFPS() * 60
self.cursor.x = self.cursor.x - step_size
end
elseif self.cursor.x < 0 then
self.cursor.x = 0
end
Expand Down Expand Up @@ -302,4 +323,4 @@ function launchMissiles()
game:launchMissile()
end

end
end