1. Use system event - for each object, then pick the spikes.

2. You can set acceleration/deceleration very high or set them to 0 and using some actions to control them.

-add new action(player) - Platform - Movement - set x/y component motion.

or you can use custom movement behavior.

+Always

->Set playerhealthbar.width to

clamp(playerhealthbar.width - 1, (player.value('health') / 100) * playerhealthbar.value('maxwidth'), playerhealthbar.value('maxwidth'))

--

This will always set hpbar.width-1 every ticks.

But if you only set this the hpbar will decrease continuously. So use the clamp to set the max and min hpbar.width value.

Clamp(Value, Lower bound, Upper bound)

Lower bound = hpbar.width you want it to be. You change this value the hpbar.width will -1 until this value. And hpbar.width-1 will stop when hpbar.width hit this value. This value is controlled by player health.

Player get damaged -> the lower bound changed -> hpbar.width start to decrease.

I don't know if this will work. Set two variables, OldHP and HP, if OldHP is greater than HP then every X milliseconds subtract 0.1 from OldHP. And set the hp bar's width to OldHP.

Ha, jayjay's method is better and simple.

You can use sine behavior and don't forget to make the platform in attributes checked.

There are more information in manual.

https://www.scirra.com/manual/103/sine

-Start of layout : array - set size to 5x10x1

   -for each element : array - set index (Array.CurrentX, Array.CurrentY) to array (Array.CurrentX*Array.CurrentY)

This will be:

+----------------------+

?X \Y?01?02?03?04?05?06?07?08?09?10?

?01? 1? 2? 3? 4? 5? 6? 7? 8? 9? 10?

?02? 2? 4? 6? 8?10?12?14?16?18?20?

?03? 3? 6? 9?12?15?18?21?24?27?30?

?04? 4? 8?12?16?20?24?28?32?36?40?

?05? 5?10?15?20?25?30?35?40?45?50?

+----------------------+

get value at (x,y):

array(1,5)==5

array(3,8)==24

You want to create 1 object per position or just don't want to repeat the last position?

Anyway I try to make a cap, maybe it's not the best method but I use array to achieve this.

https://www.dropbox.com/s/qqiyz0mt5o2j6wb/Non_overlapping_create.cap

How about using a dummy target?

https://www.dropbox.com/s/sfb7lvxtx3w1uns/dummy_target.cap

When you release the space bar. Also you can set particles rate to 0.

I can't open capx file, maybe you could try destroy or invisible when release.

I'm trying to make this using grid movement. Hope this can help you :)

dropbox.com/s/x7q7b731hdipj0l/grid_move.cap

Now 50*50*1 array can fill the hash table properly. ;)

dropbox.com/s/5yugk6p0eqfum5q/hashtable%20to%20array%20conversion%28edit%29.cap

I changed 1 action. I'm not sure this is the best solution but it works. :)

dropbox.com/s/ygln52tpqfpbwea/hashtable%20to%20array%20conversion.cap