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PongSource/src/states/PlayState.lua

+PlayState = Class{__includes = BaseState}
+
+function PlayState:enter(params) 
+  paddle1 = params.paddle1
+  paddle2 = params.paddle2
+  ball = params.ball
+
+  self.background = params.background
+  self.mode = params.mode
+  self.maxScore = params.maxScore
+end
+
+function PlayState:update(dt)
+  paddle1:update(dt)
+  paddle2:update(dt)
+  ball:update(dt)
+
+  -- paddle1 or paddle2 overlap the ball, bounce the ball
+  if ball:collides(paddle1) then
+    self:paddleOverlap(1)
+    gSounds['paddle_hit']:play()
+  elseif ball:collides(paddle2) then
+    self:paddleOverlap(2)
+    gSounds['paddle_hit']:play()
+  end
+
+  -- player1 control
+  if love.keyboard.isDown('w') then
+    paddle1.dy = -200
+  elseif love.keyboard.isDown('s') then
+    paddle1.dy = 200
+  else
+    paddle1.dy = 0 
+  end
+
+  if self.mode == 0 then -- computer control
+    if ball.dx > 0 and ball.y < paddle2.y then
+      paddle2.dy = -PADDLE_BOT_SPEED
+    elseif ball.dx > 0 and ball.y > paddle2.y then
+      paddle2.dy = PADDLE_BOT_SPEED
+    else
+      paddle2.dy = 0 
+    end
+  else  -- player2 control
+    if love.keyboard.isDown('up') then
+      paddle2.dy = -PADDLE_SPEED
+    elseif love.keyboard.isDown('down') then
+      paddle2.dy = PADDLE_SPEED
+    else
+      paddle2.dy = 0 
+    end
+  end
+
+  if ball.x >= VIRTUAL_WIDTH - 4 or ball.x <= 0 then
+    if ball.x >= VIRTUAL_WIDTH - 4 then
+      paddle1:changeScore(paddle1:getScore() + 1)
+      ball.dx = -100
+    end
+
+    if ball.x <= 0 then
+      paddle2:changeScore(paddle2:getScore() + 1)
+      ball.dx = 100
+    end
+    ball:reset()
+
+    gSounds['point_scored']:play()
+
+    local winner = self:isVictory()
+    if winner == 1 or winner == 2 then
+      gStateMachine:change('victory', {
+        background = self.background,
+        paddle1 = paddle1,
+        paddle2 = paddle2,
+        winner = winner,
+      })
+    else
+      gStateMachine:change('serve', {
+        mode = self.mode,
+        background = self.background,
+        maxScore = self.maxScore,
+        paddle1 = paddle1,
+        paddle2 = paddle2,
+        ball = ball
+      })
+    end
+  end
+end
+
+function PlayState:render()
+  if self.background == 0 then 
+    love.graphics.clear(40 / 255, 45 / 255, 52 / 255, 1)
+  else
+    local backgroundName = 'background-' .. self.background
+
+    local backgroundWidth = gTextures[backgroundName]:getWidth()
+    local backgroundHeight = gTextures[backgroundName]:getHeight()
+    love.graphics.draw(gTextures[backgroundName], 0, 0, 0, VIRTUAL_WIDTH / (backgroundWidth - 1), VIRTUAL_HEIGHT / (backgroundHeight - 1))
+  end
+
+  love.graphics.setFont(gFonts['large'])
+  self:drawTextWithShadow(paddle1:getScore(), -100, 200)
+
+  self:drawTextWithShadow(paddle2:getScore(), 100, 200)
+
+  paddle1:render()
+  paddle2:render()
+  ball:render() 
+end
+
+function PlayState:drawTextWithShadow(text, x, y)
+  love.graphics.setColor(34/255, 32/255, 52/255, 255/255)
+  love.graphics.printf(text, x + 2, y + 1, VIRTUAL_WIDTH, 'center')
+  love.graphics.printf(text, x + 1, y + 1, VIRTUAL_WIDTH, 'center')
+  love.graphics.printf(text, x + 0, y + 1, VIRTUAL_WIDTH, 'center')
+  love.graphics.printf(text, x + 1, y + 2, VIRTUAL_WIDTH, 'center')
+
+  love.graphics.setColor(1, 1, 1, 1)
+  love.graphics.printf(text, x, y, VIRTUAL_WIDTH, 'center')
+end
+
+function PlayState:paddleOverlap(player)
+  ball.dx = -ball.dx * BALL_ACCELERATION
+
+  if player == 1 then
+    ball.x = paddle1.x + 5
+  elseif player == 2 then 
+    ball.x = paddle2.x - 4
+  end
+
+  if ball.dy < 0 then
+    ball.dy = -math.random(10, 80)
+  else
+    ball.dy = math.random(10, 80)
+  end
+end
+
+function PlayState:isVictory()
+  if self.maxScore <= paddle1:getScore() then
+    return 1
+  elseif self.maxScore <= paddle2:getScore() then
+    return 2
+  else 
+    return 0
+  end
+end
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