Blinker

pong: make computer slow
Parent 75aef1e
Stefan Schuermans

Stefan Schuermans commited on 2019-06-15 14:37:52
Showing 2 changed files, with 38 additions and 1 deletions.

src/common/Pong.cpp
View file @ e496ba3
... ... 
@@ -35,7 +35,7 @@ Pong::Pong(const std::string &name, Mgrs &mgrs, const Directory &dirBase):
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   m_filePadColor(dirBase.getFile("padColor")),
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   m_ballColor(), m_lineColor(), m_padColor(),
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   m_ballPosX(-1), m_ballPosY(-1), m_ballDirX(0), m_ballDirY(0),
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-  m_padSize(0), m_leftPosY(0), m_rightPosY(0)
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+  m_padSize(0), m_leftPosY(0), m_rightPosY(0), m_leftDelay(0), m_rightDelay(0)
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 {
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   // FIXME: activate at begin for initial development only
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   activate();
... ... 
@@ -70,6 +70,8 @@ void Pong::reinitialize()
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   m_padSize = (m_height + 1) / 3;
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   m_leftPosY = (m_height - m_padSize) / 2;
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   m_rightPosY = (m_height - m_padSize) / 2;
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+  m_leftDelay = 0;
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+  m_rightDelay = 0;
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   // convert colors
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   color2data(m_fileBallColor, m_ballColor);
... ... 
@@ -126,6 +128,28 @@ void Pong::timeCall()
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   planTimeCall();
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 }
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+/**
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+ * @brief delay processing for computer players
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+ * @param[in,out] delay delay variable of computer player
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+ * @return whether computer player is allowed to move
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+ */
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+bool Pong::computerDelay(int &delay) const
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+
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+{
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+  // zero delay: generate new delay
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+  if (delay <= 0) {
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+    int avg_steps = (m_height - m_padSize) / 2;
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+    int delay_range = avg_steps > 1 ? m_width / avg_steps: m_width;
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+    delay = rand() % delay_range + delay_range;
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+  }
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+
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+  // count down delay
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+  --delay;
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+
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+  // moving allowd if delay expired
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+  return delay <= 0;
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+}
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+
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 /**
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  * @brief computation of ideal pad position for computer players
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  * @param[in] padBallX x coordinate of position of ball when hitting the pad
... ... 
@@ -199,18 +223,22 @@ void Pong::computerMovePad(int padYmin, int padYmax, int &padPosY) const
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 /// computer player for left pad
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 void Pong::computerLeft()
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 {
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+  if (computerDelay(m_leftDelay)) {
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     int padYmin, padYmax;
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     computerComputePadPos(1, m_leftPosY, padYmin, padYmax);
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     computerMovePad(padYmin, padYmax, m_leftPosY);
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   }
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+}
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 /// computer player for right pad
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 void Pong::computerRight()
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 {
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+  if (computerDelay(m_rightDelay)) {
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     int padYmin, padYmax;
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     computerComputePadPos(m_width - 2, m_rightPosY, padYmin, padYmax);
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     computerMovePad(padYmin, padYmax, m_rightPosY);
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   }
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+}
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 /// bounce ball
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 void Pong::bounceBall()
src/common/Pong.h
View file @ e496ba3
... ... 
@@ -61,6 +61,13 @@ protected:
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   /// callback when requested time reached
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   virtual void timeCall();
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+  /**
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+   * @brief delay processing for computer players
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+   * @param[in,out] delay delay variable of computer player
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+   * @return whether computer player is allowed to move
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+   */
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+  bool computerDelay(int &delay) const;
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+
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   /**
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    * @brief computation of ideal pad position for computer players
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    * @param[in] padBallX x coordinate of position of ball when hitting the pad
... ... 
@@ -120,6 +127,8 @@ protected:
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   int       m_padSize;       ///< size of player pads
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   int       m_leftPosY;      ///< position of top pixel of left pad
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   int       m_rightPosY;     ///< position of top pixel of left pad
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+  int       m_leftDelay;     ///< delay for coputer moving left pad
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+  int       m_rightDelay;    ///< delay for coputer moving left pad
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 }; // class Canvas
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 } // namespace Blinker
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