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by **tinkergnomie** » Sun Nov 24, 2013 3:36 pm

hello everyone ..... hows it going ?

i was wondering about how could you script a draw actor event that's triggered by
perhaps a button state change or something of that nature ?? i tried do work it a
few different ways ... but none of those ways worked... so ugh i'm stumped!!!
could there possibly be anyone to assist me with this ?

by **DarkParadox** » Sun Nov 24, 2013 4:48 pm

There's some functions in GE just for getting key states in scripts. The one you'll most likely need is called GetKeyState()
For jumping, though, it'll repeat every frame, so in this example, make a variable using Game-Editor's GUI that's called jumping and is set to an actor variable, then place code like this in your actor's draw actor event:

Code: Select all: // This sets our variable, we use this to check // which keys are active. char* key = GetKeyState(); // And now we start checking our variable. // the "&& jumping" makes sure this only happens // if keydown for SPACE is YES and jumping is NO // so it doesn't keep repeating. if(key[KEY_SPACE] == 1 && jumping == 0) { yvelocity = -8; jumping = 1; }

In this case, you'll also want to make another event on this actor, where collision with the top of the ground sets jumping to 0, so you can jump again.

You can make as many IF statements as you want, of course, using most of the keys on the keyboard. This here is the list of all the keys that you can use like in the above example:

Code: Select all: KEY_BACKSPACE KEY_TAB KEY_CLEAR KEY_RETURN KEY_PAUSE KEY_ESCAPE KEY_SPACE KEY_EXCLAIM KEY_QUOTEDBL KEY_HASH KEY_DOLLAR KEY_AMPERSAND KEY_QUOTE KEY_LEFTPAREN KEY_RIGHTPAREN KEY_ASTERISK KEY_PLUS KEY_COMMA KEY_MINUS KEY_PERIOD KEY_SLASH KEY_0 KEY_1 KEY_2 KEY_3 KEY_4 KEY_5 KEY_6 KEY_7 KEY_8 KEY_9 KEY_COLON KEY_SEMICOLON KEY_LESS KEY_EQUALS KEY_GREATER KEY_QUESTION KEY_AT KEY_LEFTBRACKET KEY_BACKSLASH KEY_RIGHTBRACKET KEY_CARET KEY_UNDERSCORE KEY_BACKQUOTE KEY_a KEY_b KEY_c KEY_d KEY_e KEY_f KEY_g KEY_h KEY_i KEY_j KEY_k KEY_l KEY_m KEY_n KEY_o KEY_p KEY_q KEY_r KEY_s KEY_t KEY_u KEY_v KEY_w KEY_x KEY_y KEY_z KEY_PAD_0 KEY_PAD_1 KEY_PAD_2 KEY_PAD_3 KEY_PAD_4 KEY_PAD_5 KEY_PAD_6 KEY_PAD_7 KEY_PAD_8 KEY_PAD_9 KEY_PAD_PERIOD KEY_PAD_DIVIDE KEY_PAD_MULTIPLY KEY_PAD_MINUS KEY_PAD_PLUS KEY_PAD_ENTER KEY_PAD_EQUALS KEY_UP KEY_DOWN KEY_RIGHT KEY_LEFT KEY_INSERT KEY_HOME KEY_END KEY_PAGEUP KEY_PAGEDOWN KEY_F1 KEY_F2 KEY_F3 KEY_F4 KEY_F5 KEY_F6 KEY_F7 KEY_F8 KEY_F9 KEY_F10 KEY_F11 KEY_F12 KEY_F13 KEY_F14 KEY_F15 KEY_NUMLOCK KEY_CAPSLOCK KEY_SCROLLOCK KEY_RSHIFT KEY_LSHIFT KEY_RCTRL KEY_LCTRL KEY_RALT KEY_LALT KEY_RMETA KEY_LMETA KEY_LWINDOWS KEY_RWINDOWS KEY_ALT_GR KEY_HELP KEY_PRINT KEY_SYSREQ KEY_BREAK KEY_MENU KEY_MAC_POWER KEY_EURO KEY_POCKET_UP KEY_POCKET_DOWN KEY_POCKET_LEFT KEY_POCKET_RIGHT KEY_POCKET_A KEY_POCKET_B KEY_POCKET_C KEY_POCKET_START KEY_POCKET_AUX1 KEY_POCKET_AUX2 KEY_POCKET_AUX3 KEY_POCKET_AUX4 KEY_POCKET_AUX5 KEY_POCKET_AUX6 KEY_POCKET_AUX7 KEY_POCKET_AUX8 KEY_GP2X_BUTTON_UP KEY_GP2X_BUTTON_DOWN KEY_GP2X_BUTTON_LEFT KEY_GP2X_BUTTON_RIGHT KEY_GP2X_BUTTON_UPLEFT KEY_GP2X_BUTTON_UPRIGHT KEY_GP2X_BUTTON_DOWNLEFT KEY_GP2X_BUTTON_DOWNRIGHT KEY_GP2X_BUTTON_CLICK KEY_GP2X_BUTTON_A KEY_GP2X_BUTTON_B KEY_GP2X_BUTTON_X KEY_GP2X_BUTTON_Y KEY_GP2X_BUTTON_L KEY_GP2X_BUTTON_R KEY_GP2X_BUTTON_START KEY_GP2X_BUTTON_SELECT KEY_GP2X_BUTTON_VOLUP KEY_GP2X_BUTTON_VOLDOWN

by **tinkergnomie** » Mon Nov 25, 2013 12:44 pm

hello dark paradox.....

i tried doing what you explained as best as i could understand it and still it doesn't seem to work.
all it seems to do is when i press the key is the actor flies upward ( yvelocity=-8) .....???
perhaps there's something missing from your instructions ???? i tried putting the first set of code into the
actors "draw actor" event just as you instructed,.... then i went into the variables section and declared
"jumping" as an "actor variable". i'm not sure what else i should have done in light of seeing your code ....
is there some other variable(s) i might need to establish for this to happen???

by **tinkergnomie** » Mon Nov 25, 2013 4:13 pm

i just tried to do the following code below......
it works as a jump ... but as long as the key is pressed the actor
will continue to rise up in the air and thats not exactly what i was hoping
for to happen.

// This sets our variable, we use this to check
// which keys are active.
char* key = GetKeyState();
// And now we start checking our variable.
// the "&& jumping" makes sure this only happens
// if keydown for SPACE is YES and jumping is NO
// so it doesn't keep repeating.
if(key[KEY_SPACE] == 1 && jumping == 0)
{
yvelocity = -8;
jumping = 1;
}

if(key[KEY_SPACE] == 0 && jumping == 1)
{
yvelocity = +8;
jumping = 0;
}
******************************************************************

however .... as long as i have the key constantly pressed the actor keeps flying upwards and i was hoping to fix that where when i press the key the jump lasts for maybe 2 seconds or less then the actor i would like to have plummet to the ground.

by **DarkParadox** » Mon Nov 25, 2013 4:42 pm

No, no no...
In a new event, Collision with TOP of whatever actor is your GROUND, put this code:

Code: Select all: jumping = 0;

And in your draw-actor event:

Code: Select all: char* key = GetKeyState(); if(key[KEY_SPACE] == 1 && jumping == 0) { yvelocity = -8; jumping = 1; } // This is for gravity. yvelocity = yvelocity + 0.8;

The variable "jumping" keeps track of if our actor is in the air or not (1 or 0). If our actor is not currently jumping (jumping==0), and space is pressed (key[KEY_SPACE]==1), it should trigger it's movement upward (yvelocity = -8), and set jumping to say we've already pressed the jump key (jumping=1). Then, when we collide with the top of the ground, we set jumping to 0 again, to say that we've finished jumping and can jump again.
(yvelocity = yvelocity + 0.8 ) is for gravity. It's constantly adding a little downward momentum to our actor to offset jumps or whatever.

by **tinkergnomie** » Mon Nov 25, 2013 5:26 pm

hello dark paradox. .. thank you for the new code info, it worked excellently.
thanks a million,.... i really appreciate you helping me understand this.

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