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Turning
GEOvanne
Member #10,233
September 2008

I'm working on a dragon riding game.
So far I can make the dragon walk left and right and have it walk backwards left or right. I also made it so that when you press DOWN the dragon changes directions.

But what I really want is for the turning animation to be played while turning, I've been trying different things with the code but I just can't seem to get it to work properly.

The laptop I'm working on has no way of getting something off it but my code follows this logic:

#SelectExpand
1while(!key[KEY_ESC]) 2{ 3 if(dir==1)//left 4 { 5 if(key[KEY_LEFT]) 6 { 7 //code to play the left actions in the sprite sheet 8 } 9 if(key[KEY_RIGHT]) 10 { 11 //code to play the left actions backward in the sprite sheet 12 } 13 else 14 { 15 //dragon stand in the left pose 16 } 17 } 18 19 if(dir==2)//right 20 { 21 //similar to left 22 } 23 24 if(key[KEY_DOWN])//turn 25 { 26 //what it used to do was change the dir to 1 or 2 27 } 28 29}

Ok so the problem is with playing the turning animation from the sprite sheet.
Those sprite are in the middle of the sheet, so what I did was (when down is pressed) set 'currentframe' to the start of the animation (frame 7) and have it increment to 9 and set it to the standing pose (0 or 13).
But I just cant seem to pull of this piece properly.

Has anyone of you done something similar to this?

gnolam
Member #2,030
March 2002
avatar

GEOvanne said:

I forgot how to do the code tags

See that big button above the reply box that says "Formatting Help"? Click it. :P

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Edgar Reynaldo
Major Reynaldo
May 2007
avatar

Code tags use angle brackets, like this : <code>code goes here...</code>

There's a simple animation class for Allegro 4 here if you want to use it. It has support for forwards / backwards / forwards and back animations, once or in a loop. It tells you when the animation is done so you can set a new one. All you have to do is declare an animation, tell it how many frames and how long to run for each loop, set each frame, and then call AdvanceFrameTime when your timer ticks and DrawOn when you need to draw. Since you have several animations, you would probably want to use a pointer to an animation and change what the pointer points to when you change animations.

van_houtte
Member #11,605
January 2010
avatar

I suggest you learn to make tic tac toe or a game of rock paper scissors first, you lack basic programming skills :D

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Edgar Reynaldo
Major Reynaldo
May 2007
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Don't pay any attention to van_houtte, he's disgruntled because he works overnights and doesn't have any friends.

Arthur Kalliokoski
Second in Command
February 2005
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he's disgruntled because he works overnights and doesn't have any friends.

Not to mention he can't use the tools of the trade...

“Throughout history, poverty is the normal condition of man. Advances which permit this norm to be exceeded — here and there, now and then — are the work of an extremely small minority, frequently despised, often condemned, and almost always opposed by all right-thinking people. Whenever this tiny minority is kept from creating, or (as sometimes happens) is driven out of a society, the people then slip back into abject poverty. This is known as "bad luck.”

― Robert A. Heinlein

van_houtte
Member #11,605
January 2010
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KLAXXZ GAME MAKER is the tool of the trade ;D

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GEOvanne
Member #10,233
September 2008

Well yeah, there IS alot for me to learn, but I have made a rock paper scissors type monster fighting game before :)

I don't have allegro 4. I had 2 computers with a compiler/allegro on it, one is in the shop waiting to be fixed and the other has busted usb ports and got allegro before 4 came out.

But I tried to analyze the animation class that you should me, I changed my code to use switch/case, but now it doesn't even go.

Edgar Reynaldo
Major Reynaldo
May 2007
avatar

GEOvanne
Member #10,233
September 2008

Ok, so I finally got it to work. The problem was that I had the down code modeled after the left and right code

 if(dir==1)//left
     {
        if(key[KEY_LEFT]) //looking left and going left
        {
           x++;
           curframe ++; 
           if(curframe > 4)
           {
              curframe =1;
           }
        }

What I did was added a while loop and took out the if statement

//down button (turning action)
if(dir=1)
{
curframe = 4;
while(key[KEY_DOWN])
{
    curframe++;
    if(curframe > 7)//last frame in turn animation
    {
       curframe = 12; //standing facing the opposite direction
    }
}
dir=2;
}

Putting everything in switches helped.

Edgar Reynaldo
Major Reynaldo
May 2007
avatar

GEOvanne said:

What I did was added a while loop and took out the if statement

//down button (turning action)
if(dir=1)
{
curframe = 4;
while(key[KEY_DOWN])
{
    curframe++;
    if(curframe > 7)//last frame in turn animation
    {
       curframe = 12; //standing facing the opposite direction
    }
}
dir=2;
}

Putting everything in switches helped.

You do know that that while loop will almost always result in curframe being 12, and whenever dir equals 1 it will be set to 2 right? That doesn't sound like it does what you want it to.

I think you should take a look at the link to the animation class I posted earlier in this thread. If you use it, your code could be as simple as this :

#SelectExpand
1 2while (!quit) { 3 // draw 4 clear_to_color(buffer , makecol(0,0,0)); 5 current_anime->Draw(buffer , px , py); 6 blit(buffer , screen , 0 , 0 , 0 , 0 , buffer->w , buffer->h); 7 8 // wait until timer ticks 9 while (ticks < 1) {rest(1);} 10 double dt = ticks*(1.0/FPS); 11 12 // update objects 13 int loop = current_anime->AdvanceFrameTime(dt); 14 if (current_anime == &left_to_right_anime) { 15 if (loop == -1) { 16 dir = RIGHT; 17 current_anime = &face_right_anime; 18 } 19 } 20 if (current_anime == &right_to_left_anime) { 21 if (loop == -1) { 22 dir = LEFT; 23 current_anime = &face_left_anime; 24 } 25 } 26 27 // check input 28 switch (dir) { 29 case LEFT : 30 if (key[KEY_DOWN] && !old_key[KEY_DOWN]) { 31 current_anime = &left_to_right_anime; 32 } 33 break; 34 case RIGHT : 35 if (key[KEY_DOWN] && !old_key[KEY_DOWN]) { 36 current_anime = &right_to_left_anime; 37 } 38 break; 39 } 40 41 // update old key array 42 for (int i = 0 ; i < KEY_MAX ; ++i) {old_key[i] = key[i];} 43}

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