Driving Engine
Шаблон:Wiki Standards A driving engine is used in a variety of racing games, and can be very easy to replicate. There are two main ways that top-down driving works- in a non-scrollable world and a scrollable world. For the non-scrollable driving engine, only 1 script is needed.
Non-scrollable Engine
when gf clicked go to x: (0) y: (0) // reset position point in direction (90) // reset direction set [turn v] to (0) // reset on flag click set [velocity v] to (0) // reset on flag click forever if <(0) < (velocity)> then // if sprite moving forward if <key [left arrow v] pressed?> then change [turn v] by (-0.75) // affect direction negatively change [velocity v] by (-0.15) // slow down forward movement on turn end if <key [right arrow v] pressed?> then change [turn v] by (.75) // affect direction positively change [velocity v] by (-0.15) // slow down forward movement on turn end else// if movement speed negative if <key [left arrow v] pressed?> then change [turn v] by (.75) // turn opposite direction, as with real cars change [velocity v] by (.15) // slow down backward movement on turn end if <key [right arrow v] pressed?> then change [turn v] by (-0.75) // turn opposite direction, as with real cars change [velocity v] by (.15) // slow down backward movement on turn end end if <key [up arrow v] pressed?> then change [velocity v] by (.5) // move forward end if <key [down arrow v] pressed?> then change [velocity v] by (-0.5) // move backward end set [turn v] to ((turn) * (.9)) // gradually slow down, as in real physics turn right (turn) degrees // set turn to control the sprite's direction set [velocity v] to ((velocity) * (.9)) // gradually slow down, as in real physics move (velocity) steps // set velocity to control the sprite's position end
Scrollable Engine
The main difference between the scrollable driving engine and the non-scrollable driving engine is that a non-scrollable driving engine is good for one computer, two player games, while a scrollable engine is primarily used in one player or online, cloud-based games.The scrollable driving engine requires two sprites- car and road- and as such, two separate scripts. The first one is very similar to the non-scrollable script.
when gf clicked go to x: (0) y: (0) // reset position point in direction (90) // reset direction set [turn v] to (0) // reset on flag click set [velocity v] to (0) // reset on flag click forever if <(0) < (velocity)> then // if sprite moving forward if <key [left arrow v] pressed?> then change [turn v] by (.75) // affect direction positively change [velocity v] by (-0.15) // slow down forward movement on turn end if <key [right arrow v] pressed?> then change [turn v] by (-0.75) // affect direction negatively change [velocity v] by (-0.15) // slow down forward movement on turn end else// if movement speed negative if <key [left arrow v] pressed?> then change [turn v] by (-0.75) // turn opposite direction, as with real cars change [velocity v] by (.15) // slow down backward movement on turn end if <key [right arrow v] pressed?> then change [turn v] by (.75) // turn opposite direction, as with real cars change [velocity v] by (.15) // slow down backward movement on turn end end if <key [up arrow v] pressed?> then change [velocity v] by (.5) // move forward end if <key [down arrow v] pressed?> then change [velocity v] by (-0.5) // move backward end set [turn v] to ((turn) * (.9)) // gradually slow down, as in real physics set [velocity v] to ((velocity) * (.9)) // gradually slow down, as in real physics move (velocity) steps // set velocity to control the sprite's position end
Here is the script that controls the movement of the 'road' the car is driving on. Шаблон:Note
when gf clicked set rotation style [don't rotate v] go to x: (0) y: (0) // reset position forever move ((0) - (velocity)) steps// move opposite direction of velocity point in direction ([direction v] of [car v]) // point in direction of car end
