There is a pygame object to create a 2d vector? 2011/7/20 Joe Ranalli <jrana...@gmail.com>
> Yes a vector is probably appropriate. > > > On Wed, Jul 20, 2011 at 10:20 AM, Nathan BIAGINI <nathan.o...@gmail.com>wrote: > >> Ok. But all the calcul of how long the bullet will take to reach the >> target etc... will be made byn using vector? I mean, using a vector still >> viable? >> >> >> 2011/7/20 Joe Ranalli <jrana...@gmail.com> >> >>> It depends what you're trying to do. >>> >>> If you draw the straight line between the tower and the enemy and use >>> that vector to translate a bullet each tick, the bullets might miss the >>> enemy. Think about it this way, the bullet moves 2 steps toward the enemy, >>> then the enemy moves 1 step, then the bullet moves 2, etc. Because the >>> enemy moves the bullet will have to change its direction through the >>> flight. So you could calculate the direction vector between the bullet and >>> the enemy every tick and have the bullet move that direction. That would >>> make the bullets kind of arc to the target. >>> >>> If you want to have the bullet go straight to the right spot, you need >>> to: >>> 1) calculate how long the bullet will take to get to the enemy >>> 2) calculate where the enemy will be at that time (newposition) >>> 3) calculate how long it will take the bullet to get to newposition >>> 4) recalculate newposition based on the new time >>> >>> Technically you could iterate that repeatedly until newposition >>> converges. Practically, iterating once probably gets you close enough >>> unless the movement is extremely complicated. >>> >>> >>> On Wed, Jul 20, 2011 at 9:14 AM, Nathan BIAGINI >>> <nathan.o...@gmail.com>wrote: >>> >>>> Hi everyone, >>>> >>>> i would like to know what are the common way to handle "trajectory" in a >>>> 2d game. In fact, i think of writing a tower defense game and i wonder how >>>> to handle the trajectory of the missile launch by the towers. I though of >>>> getting the pos of the tower and the target and create a vector between >>>> this >>>> two entitites to make a sprite translation of this vector but there is >>>> maybe >>>> some tricky stuff to do it. >>>> >>>> Thanks in advance and happy game making all :-) >>>> >>> >>> >> >
