The elusive hitTest explained

hi i need to know if my code only needs minor tweaking or if i should scrap it and completely over haul it. i want the tank to slow to a stop, and for the rumble to stop or at least lower in volume when the movement key is released. i cant get the wall collision straight

keys are:

player 1
up arrow move forward
down arrow move back
left&right arrow rotate tank
V & B rotate turret




player 2
move forward 8
move back 5
rotate tank 4&6
rotate turret 7&9


hey what do you think of the tank design?

Well thanks for any help and also thanks to someone whose name i cant remember for giving me the code i already have used.
Martin

Does anyone know if using hitTest with bounding boxes is less or more cpu intensive than writing your own function to do the same thing?
I'm just wondering which is "better". :)

The bounding boxes will be faster then writing a WHOLE function, although I don't think it will be a big difference...
But you don't need a function for the hittest the:

Code:

---

if(mc.hitTest(_x, _y, true)){

---

works very well

hi guys,
i have been hearing interesting things with this hitTest. ive also tried to put empty mc's on the corners of the car (or tank im my case). this is what ive added into the tank code:

Code:

---

    // hitTest with the rocks
    if (_root.tank.boundary.hitTest(_root.land)) {
        speed *= -.5;
    }

---

y doesnt that work - it goes into like the centre of the tank still:S thanks for your help...

Heyleighton can you put your fla tanks engine in flash 5 format? Please

Thanks

it is in flash 5 format... okay ill try again:D here it is matey...

i am testing a newcool game kinda like snake. in the game you are suposed to catch all the red balls but you always leave a grey wall behind you, and if you hit it, you die!!! uses a whole lot of hittests. i just learned that if you gave two movieclips the same instance name ("wall" in my case) and you try to hittest another mc to them, it wont work, not as:

Code:

---

//this is in the "wall" mc
if(this.hitTest(ship){
//something
}

---

or:

Code:

---

//this is in the "ship" mc
if(this.hitTest(wall){
//something
}

---

youll find it on my website soon...

Yeah that's right...

MC,s on the same lvl never can have the same instance name...

does ne1 know y it doesnt work??? or cant u download the file???

I want to know how to make a health bar go down on hit.

I can make one with numbers, like 100hp if hit, then -10.. now 90.

but I need one witha graphic bar...

I saw a tut somewhere before...

a tut? here's a tut to you, from me.

1. make a bar and give it the instance name healthBar
2. put in this code
onClipEvent(load) {
_root.healthBar._width=100
}
onClipEvent(enterFrame) {
if (enemy attacks you, whatever happens - put in the code here) {
_root.healthBar._width-=10
}
if (_root.healthBar._width<=0){
you die
}
}

Cool. that wasn't so complicated :). Thanks.

I've gone through the messages in this thread and I don't think that there was anything that specifically helped me with this, so I thought that I would ask in case anyone could help me! :)

Essentially, I want to have the player control an object that will follow a sloped track when they press the right arrow key (a roller coaster), but the track is random. They would be able to jump up off of the track briefly, and set back down. Having a character run along a straight area is easy, but what about slopes?

Thanks! =^i^=

ironclaw: remember to put the box which will be the health bar on the side of the centerpoint, or else its width will be decreased from both sides (towards the center point).
Takysa: can you upload the file or give a better description, as i didnt understand what u meant.:confused:

Thanks, Ihoss, but I already knew that :)

Sorry!

What I mean is that I want the movie clip to travel along the shape of the track, like when you're on a rollercoaster. So, rather than just changing the x axis of the player if he's walking along a flat surface, I'm changing the y as well to correspond with the shape of the track. They go from left to right, with dips and crests along the way. However, I don't know how to best tackle this, because the track is not going to be one single movie clip; it will have sections that are random so that the track is never the same.

If I can get a visual for what I want to do, I'll post it.

there are two ways to do that (which i know of):
the graphical: you can put the track inside another mc, and then hittest it that way. this of course depends on how big your character is:

Code:

---

track.hitTest(character._x, character._y,true){
setProperty(character,_x,getProperty(character,_x)-5);
}

---

the mathematical:You get your characters _x and uses this _x to find the _y of the track underneith him. then see if their _y's the same and move him up if they are. To find which part of the track is at that _x, you can make them all 5 pixels wide and call them trackx1, trackx2 trackx3... Then you get the _x of your character and divide it by 5 and put it in a varable (eg current_X):

Code:

---

char_x=getProperty(character,_x);
char_y=getProperty(character,_y);
current_x=char_x/5;
track_y=getProperty("trackx" + current_x,_y);
if(track_y - char_y<-2){
setProperty(character,_x,getProperty(character,_x)-5);
}

---

hope this made sense...

thank you very much :)

I need some hittest help. I have a game that needs to have accurate collisions. The only two I know of are if(this.hittest(object1)){Blah Blah Blah} which has the bounding box limitation and if(this.hittest(object1._x, object1._y, true){Blah Blah Blah} which did not seem to accurately pick up what was transparent and what was not. (Don't ask why?)

If you want to see what I mean (uses: if(this.hittest(object1._x, object1._y, true){})

Just so you know, the shields that appear when they collide should come up at aprox the same time (they are colliding, right!) and its obvious they don't unless they hit each other dead center.

SWF FILE
FLA FILE (Flash MX)
FLA FILE (Flash 5)

Controls for Sovereign (Grey Ship)
Left=Left Arrow
Right=Right Arrow
Forward=Up Arrow
Reverse=Down Arrow
Laser=Delete
Torpedo=End
Warp=Page Down

Controls for Valdore (Green Ship)
Left=A
Right=D
Forward=W
Reverse=S
Laser=Q
Torpedo=E
Warp=Z
Cloak=C

whats the problem? it seems to work fine for me...