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+====== Keyboard events ======
+Use ''love.keyboard.isDown("key-string")'' to detect whether a key is being held down. Define functions ''love.keypressed(key)'' and ''love.keyreleased(key)'' to do something when a key is pressed or released.
+Resources:
+  * https://www.love2d.org/wiki/love.keyboard
+  * https://www.love2d.org/wiki/KeyConstant
+<file lua main.lua>
+--[[
+    Move a circle around using keyboard input with ability to
+    change color and speed.
+    Mithat Konar
+--]]
+function love.load()
+    -- circle's constants
+    CIRCLE_SIZE = 30
+    DEFAULT_SPEED = 100
+    circle_speed = DEFAULT_SPEED
+    -- circle's variables
+    -- put circle in the center of the screen
+    circleX = love.graphics.getWidth() / 2
+    circleY = love.graphics.getHeight() / 2
+    -- motion variables
+    isMoveRight = false
+    isMoveLeft = false
+    isMoveDown = false
+    isMoveUp = false
+end
+function love.keypressed(key)
+    -- change color when key is pressed.
+    if key == 'c' then
+        local randomColor = {math.random(), math.random(), math.random()}
+        love.graphics.setColor(randomColor)
+    end
+    -- change speed when 'j', 'k', and 'l' keys are pressed.
+    if key == 'j' then
+        circle_speed = circle_speed / 2
+    end
+    if key == 'k' then
+        circle_speed = DEFAULT_SPEED
+    end
+    if key == 'l' then
+        circle_speed = circle_speed * 2
+    end
+end
+function love.keyreleased(key)
+    -- Change color when key is released
+    if key == 'c' then
+        local randomColor = {math.random(), math.random(), math.random()}
+        love.graphics.setColor(randomColor)
+    end
+end
+function love.update(dt)
+    -- detect whether keys are pressed and move accordingly.
+    -- test for both arrow and WASD keys
+    if love.keyboard.isDown('right') or love.keyboard.isDown('d') then
+        circleX = circleX + circle_speed * dt
+    end
+    if love.keyboard.isDown('left') or love.keyboard.isDown('a') then
+        circleX = circleX - circle_speed * dt
+    end
+    if love.keyboard.isDown('up') or love.keyboard.isDown('w') then
+        circleY = circleY - circle_speed * dt
+    end
+    if love.keyboard.isDown('down') or love.keyboard.isDown('s') then
+        circleY = circleY + circle_speed * dt
+    end
+end
+function love.draw()
+    love.graphics.print(circleX .. ', ' .. circleY, 5, 5)
+    love.graphics.print('Circle speed: ' .. circle_speed, 5, 25)
+    love.graphics.circle('fill', circleX, circleY, CIRCLE_SIZE)
+end
+</file>