MarksMan

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+class Marksman < RTanque::Bot::Brain
+  NAME = 'MarksmanSample_testbattle'
+  include RTanque::Bot::BrainHelper
+ 
+  def tick!
+    command.speed = RTanque::Bot::MAX_SPEED
+    nearest = nearest_target()
+ 
+    if (!defined?(@direction))
+      @direction = 0
+      @previousTargetX = 0
+      @previousTargetY = 0
+    end
+ 
+    if (nearest)
+        targetX = sensors.position.x + Math.sin(nearest.heading) * nearest.distance
+        targetY = sensors.position.y + Math.cos(nearest.heading) * nearest.distance
+ 
+        power = RTanque::Bot::MAX_FIRE_POWER
+ 
+        predictedTargetX = targetX + (targetX - @previousTargetX) * nearest.distance / (5.0 * power)
+        predictedTargetY = targetY + (targetY - @previousTargetY) * nearest.distance / (5.0 * power)
+ 
+        deltaX = predictedTargetX - sensors.position.x
+        deltaY = predictedTargetY - sensors.position.y
+ 
+        tan = deltaX / deltaY
+        if (deltaX > 0 && deltaY > 0)
+          angle = Math.atan(tan)
+        elsif (deltaX > 0 && deltaY < 0)
+          angle = Math::PI - Math.atan(-tan)
+        elsif (deltaX < 0 && deltaY > 0)
+          angle = Math::PI * 2 - Math.atan(-tan)
+        elsif (deltaX < 0 && deltaY < 0)
+          angle = Math::PI + Math.atan(tan)
+        end
+ 
+        @previousTargetX = targetX
+        @previousTargetY = targetY
+ 
+        command.radar_heading = nearest.heading
+        command.turret_heading = angle
+        command.fire(power)
+    else
+        command.radar_heading = sensors.radar_heading + RTanque::Heading::ONE_DEGREE * 10.0
+    end
+ 
+    onWall = false
+    if (sensors.position.on_top_wall?)
+        command.heading = RTanque::Heading::SOUTH
+        onWall = true
+    elsif (sensors.position.on_bottom_wall?)
+        command.heading = RTanque::Heading::NORTH
+        onWall = true
+    elsif (sensors.position.on_left_wall?)
+        command.heading = RTanque::Heading::EAST
+        onWall = true
+    elsif (sensors.position.on_right_wall?)
+        command.heading = RTanque::Heading::WEST
+        onWall = true
+    end
+ 
+    if (onWall)
+      if (sensors.heading.delta(command.heading) > 0)
+        @direction = 1
+      else
+        @direction = -1
+      end
+    else
+        if (Random.rand(80) < 1)
+            @direction = 0 - @direction
+        end
+ 
+        command.heading = sensors.heading + @direction * RTanque::Heading::ONE_DEGREE * 5.0
+    end
+  end
+ 
+  # this function borrowed from rort1.rb (https://gist.github.com/ronald/5146511)
+  def nearest_target
+    reflections = sensors.radar
+    reflections = reflections.reject{|r| r.name == NAME } unless @friendly_fire
+    reflections.sort_by{|r| r.distance }.first
+  end
+end