Robocode Tutorial 4 - robocode's game physics

Robocode/ Game physics
Now let's look at Robocode Some physical parameters of .
Coordinate system ：Robocode Cartesian coordinate system , That is, the bottom left corner we most often use is （0,0） spot . This is the same as the usual java And c++ Programming is different .

Direction agreement ：
【 Absolute direction system 】：Robocode No matter which direction the robot is in, it is the absolute angle with the static battlefield screen as the reference （Heading）, Above is 0 Degree angle . That is, to the north is 0, To the East is 90, To the south is 180, To the West 270.
【 Relative direction system 】： The relative direction is based on the dynamics of the robot heading The angle is the angle difference of the reference , No longer refer to the whole static screen . It's called relative because of the robot's heading It's constantly changing as the robot moves ,heading It's just a relative object .
【Heading】： Is the angle difference between the robot direction and the top of the screen , The direction is 0 To 360 Between .
【Bearing】： It is the angle difference between the target and the direction found by a certain part of the robot, such as radar , Clockwise is a positive angle at -180 To 180 Between .
         The details are shown in the following figure ：

 
Heading and Bearing The concept of is very important , This is the basis of all control , We must master .


Time and distance ：
        Robocode The basic unit of time is “ticks”, Every robo Every time ticks  Move a unit .Robocode The unit of distance is pixels , But it should be noted that Robocode The distance inside distance yes Double Data of type , So mobile 1.2 A pixel can be realized , in addition , To fit the screen ,Robocode One pixel inside is smaller than the real one .


Other sports Physics ：
       Forward speed ： The maximum speed of the tank (Velocity) by 8, Taipa number getVelocity() The tank is back
The speed of . 
       Add / deceleration ： Acceleration is  1  Pixels (pixel)/ frame frame , The deceleration is  2 pixel/frame. 
       Refer to the formula ： set up s For distance ,Vt Is the final speed ,Vo For the initial speed ,t For time ,a  For acceleration ： 
       Bit formula  s＝Vo*t＋a*t*t/2 
       Speed formula  Vt ＝Vo ＋a*t 
       Average velocity formula  v＝(Vt ＋ Vo)/2＝s/t 
       Acceleration Formula  a＝(Vt － Vo)/t 
See... For more physical rules 《robocode The rules of the game 》