Platform Beginnings: An Idea with Legs - The Game Maker's Companion: Game Development - page 38

5. Include a Change Sprite action ( main1 tab) with Sprite set to spr_lava_begin ,
Subimage to 0 , and Speed to 0.5 . This will slow the lava sprite's animation down by
half.
6. Include a Check Empty action ( control tab) that checks that there wouldn't be a
collision if this instance was placed 32 pixels to the left of its current position (set X to -
32 , Objects to all , and check the Relative option).
7. Include a Create Instance action ( main1 tab) that creates an instance of
obj_rock_begin 32 pixels to the left of the current object (Set X to -32 and check the
Relative option).
8. Create a new object called obj_lava_end . Select the spr_lava_end sprite and set
obj_hazard as the parent of this object.
9. Add a Create event to obj_lava_end .
10. Include a Change Sprite action ( main1 tab) with Sprite set to spr_lava_end , Subimage
to 0 , and Speed to 0.5 .
11. Include a Check Empty action ( control tab) that checks that there wouldn't be a
collision if this instance was placed 32 pixels to the right of its current position (set X to
32 , Objects to all , and check the Relative option).
12. Include a Create Instance action ( main1 tab) that creates an instance of obj_rock_end
32 pixels to the right of the current object (set X to 32 and check the Relative option).
Creating the Middle Lava Object and Its Create Event
1. Create a new object called obj_lava_middle . Select the spr_lava_middle sprite and set
obj_hazard as the parent of this object.
2. Add a Create event to obj_lava_middle .
3. Include a Change Sprite action ( main1 tab) with Sprite set to spr_lava_middle ,
Subimage to 0 , and Speed to 0.5 .
4. Include a Check Object action ( control tab) that checks if there would not be a
collision with an instance of obj_hazard if the lava instance was placed 32 pixels to the
right of its current position (Set X to 32 and check both the Relative and NOT options).
5. Include a Start Block action ( control tab) to group together the following actions.
6. Include a Change Instance action ( main1 tab) that changes into obj_lava_end with
Perform Events set to yes .
7. Include an Exit Event action ( control tab). This stops the remaining actions in the
event from being executed.
8. Include an End Block action ( control tab) to mark the end of the grouped actions.
9. Include a Check Object action ( control tab) that checks that there would not be a
collision with an instance of obj_hazard if the lava instance was placed 32 pixels to the
left of its current position (set X to -32 and check both the Relative and NOT options).
10. Include a Start Block action ( control tab) to group together the following actions.
11. Include a Change Instance action ( main1 tab) that changes into obj_lava_begin with
Perform Events set to yes .