Designing Games with Game Maker - YoYo Games

Scripts
an empty path.
path_reverse(ind) Reverses the path.
path_mirror(ind) Mirrors the path horizontally (with respect to its center).
path_flip(ind) Flips the path vertically (with respect to its center).
path_rotate(ind,angle) Rotates the path counter clockwise over angle
degrees (around its center).
path_scale(ind,xscale,yscale) Scales the path with the given factors
(from its center).
path_shift(ind,xshift,yshift) Shifts the path over the given amount.
Scripts cannot be changed during the execution of the game. The scripts are part of the game
logic. Changing scripts would lead to self-rewriting code which very easily leads to errors. Also
there are other ways to achieve this. If you really need to execute a piece of code that is not
known at design time (e.g. from a file) you can use the following functions:
execute_string(str,arg0,arg1,...) Execute the piece of code in the
string str with the indicated arguments.
execute_file(fname,arg0,arg1,...) Execute the piece of code in the
file with the indicated arguments.
Sometimes you want to store a script index in a variable and execute it. For this you can use
the following function
script_execute(scr,arg0,arg1,...) Execute the script with index scr
with the given arguments.
Time lines
The following routines are available for creating and changing time lines. Don't change time
lines that are in use!
timeline_add() Adds a new time line. It returns the index of the time line.
timeline_delete(ind) Deletes the time line with the given index. Make
sure no instances uses the time line in any room.
timeline_moment_add(ind,step,codestr) Adds a code action to the
time line at moment step. codestr contains the code for the actions. If the step