Empowerment: Sliding Ninjas - The Game Maker's Companion: Game Development - page 98

Figure 4-20. The actions for the End Step event of the land Zool state object (part 1)

Adding Skidding
1. Define a new constant called SKID_SPEED and set it to 10 (either through the Define

Constants option on the Resources menu or a new variable in the Create event of
obj_zool if you are using Game Maker Lite).

Reopen obj_zool and select the Draw event. Within the grouped actions for
FACE_RIGHT , include a new Test Variable action ( control tab) to check if the Variable
state is equal to the Value ZSTATE_SKID .

2.

3. Immediately follow this with a Draw Sprite action ( draw tab) to draw

spr_zool_skid_right at a Relative position of X = 0 , Y = 0 .

Now use spr_zool_skid_left to create left-facing equivalents of these two new actions
within the grouped actions for FACE_LEFT .

4.

Reopen obj_zool_land and select the Begin Step event. Include a Test Variable action
( control tab) immediately before the existing Set Variable action. Make this check
whether the Variable state is equal to the Value ZSTATE_WALK . This will now only set
the default state to standing if the previous state was walking, as otherwise this would
interfere with skidding.

5.