[gameprogrammer] 2d side scroller
- From: Alan Wolfe <alan.wolfe@xxxxxxxxx>
- To: gameprogrammer@xxxxxxxxxxxxx
- Date: Mon, 7 Nov 2005 09:16:42 -0800
Hey everybody!
I'm working on a 2d side scroller in SDL/OpenGL and this is the first actual
one i have ever made. Because of that, I have found some things I did which
were not the most efficient way to do things and have changed them, but I
have found other things which i know must not be the best way, but am unsure
of what the best way would be.
Here is my order of operations in my game loop:
1) Check which keys are down and move the player accordingly or spawn
bullets etc. (movement checks that there are no blocks in the way, as well
as checks if they touch spikes etc). This section also figures out which
frame of animation to draw for the main character whether he looks like he
is jumping running shooting etc.
2) Handle gravity and other physics for player, moving as necesary
3) Handle the scrolling of the camera to keep player on screen (the game
uses mouse look so the screen really scrolls based on mouse coordinates.
4) Draw paralax layers that are behind the map
5) Draw the map
6) Draw the main character
7) Draw and handle enemies - draws enemies as well as handles enemy physics
and logic (AI)
8) Draw projectiles - both enemy and player projectiles. Draws them and does
physics and logic, also checks to see if friendly bullets have hit enemies
(if so take away life from the enemy it hit) and checks to see if enemy
bullets have hit the player (if so take away life from the player).
9) Draw game objects such as powerups etc. Does physics and logic as well
for each.
10) Draw moving platforms (along with path logic as well - such as if it
moves in a circle, it will move it the next step). This part also checks to
see if each moving platform is going to hit the player when it moves. If so,
it pushes the player out of the way (checking to make sure it doesnt push
the player through a wall or anything like that).
11) Draw paralax layers that are in front of the map
12) Draw game GUI such as lives left etc
13) see if the player has touched any bad guys. If so, take away life and
mark the player as being in the "injured" animation state.
14) see if the player has touched any power ups. If so, give them energy,
extra life, or whatever.
Does anyone see anything sticking out which might be optomized or done in a
better way?
A secondary question is how is the best way to program moving platforms? I
am in the middle of implementing them and right now my tactic is this...
-----
Loop through each moving platform...
If the player is on the current platform, move them the same amount as the
platform is moving (this makes sure if they are standing on a platform that
it carries the player with it) - (taking into account other walls etc so you
don't push them into space etc)
Move the platform.
If the player wasnt on a platform but is now, move the player the same
amount as the platform is moving (taking into account other walls etc so you
don't push them into space etc)
-----
I know this isnt the best way because this makes the player "float" slightly
above the platform at times and rarely, the player will get stuck inside the
platform.
Is there a better way to do this?
Thanks!
Alan
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