My game is very similar to the hidden game in chromes web browser. I have a character that needs to jump over incoming enemies. Is there any way i can know when to send an incoming enemy? Some of the factors to take in to account i guess are the speed of enemies, height of jump, speed of jump, and dimensions of bitmaps (that represent character, and enemies).


  • \$\begingroup\$ I'm guessing you're talking about an infinite runner? \$\endgroup\$ – jzx Aug 3 '15 at 8:42

Something as simple as this would give you the rough time the player will have to react if you were to spawn an enemy right now.

minReactionTime = 0.5; //Give the player half a second to react
closingSpeed = enemySpeed + playerSpeed;

if ( (enemySpawn - playerPosition) / closingSpeed >= minReactionTime )
  • \$\begingroup\$ looks good but can you explain in words what that is going to do? \$\endgroup\$ – Izak Aug 3 '15 at 15:26
  • \$\begingroup\$ Basically it just calculates how long it will take the player and enemy to collide if they continue moving forward at max speed. This gives you a rough estimate of how long the player will have to react if you spawn an enemy at the "enemySpawn" point in that code. \$\endgroup\$ – cfehunter Aug 6 '15 at 12:22

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