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html/blockly-games/pond/crobots.txt

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+Pond is a reimplementation of Tom Poindexter's 1985 game CROBOTS.  Google has
+(with the author's permission) updated the game to be playable by a new
+generation of programmers.
+
+Differences between Pond and CROBOTS:
+
+* Theme
+CROBOTS features robots fighting in a battlefield.  Given today's diversity
+priorities, a different theme was needed.  The reimplementation features
+rubber ducks in a pond.
+
+* Battlefield size
+Height and width of battlefield is 100m x 100m instead of 1000m x 1000m.
+Since speed and damage/health go to 100, scaling the pond's size to the same
+magnitude makes for a cleaner API.  This was not possible in CROBOTS since
+integers were the only data type, whereas JavaScript has floats.
+
+* Scan resolution
+CROBOTS scans in a direction with a resolution of +/- n degrees.  Pond scans
+with a total resolution of n degrees.  The only difference is that Pond's
+resolution number is double that specified in CROBOTS.
+
+* Failed scan
+CROBOTS returns 0 for a scan that failed to detect another player.
+Pond returns Infinity.
+
+* Impact damage
+CROBOTS gives a flat 2% damage to robots colliding with a wall or another robot.
+Pond gives up to 3% damage, proportional to the speed at impact.
+
+* Blast damage
+CROBOTS gives 3%/5%/10% damage to robots within 40m/20m/5m of an explosion.
+Pond uses a proportional formula ((1 - r / 4) * 10) which is similar (after
+accounting for the 10x decrease in battlefield size), but slightly increases
+the value of accuracy.
+
+* Swim
+Because of the rubber duck theme, 'swim()' has been added as an alias to
+CROBOT's 'drive()'.  Pond supports 'drive()' as an undocumented function.
+
+* Stop
+Pond introduces a new function 'stop()' that is the equivalent of
+'drive(0, d)', where d is the current driving direction.
+
+* Health
+People are more used to games having 'health' (more is better) rather than
+'damage' (less is better).  Pond introduces 'health()', with 'damage()' being
+an undocumented function.
+
+* Trigonometry
+CROBOTS has top-level sin/cos/tan/atan functions that use degrees.
+Pond adds these to the JavaScript Math object as Math.sin_deg/Math.cos_deg/etc.
+
+* Constants
+Various constants such as acceleration rate, robot-missile speed ratio, etc are
+tuned differently.  These differences are not intentional.
+
+Google is indebted to Tom Poindexter for inspiring so many young people to
+learn about programming through his game.  We hope to continue this success
+with Pond.  As with CROBOTS, all the code for Pond is open source.
+
+The original DOS-based CROBOTS game may be found here:
+  http://crobots.deepthought.it/home.php
+  https://github.com/tpoindex/crobots/
+
+--
+Neil Fraser
+Google, California
+August 2014