Help with making a game, Please.

[SergeLo00001]

I am trying to make a 2d game where a guy shoots a gun. You shoot with the mouse left button. I am having trouble making the part were the bullet goes to where you cliked and from where it starts(tip of the gun). Help me if you know how to do this, or even if you can help me with a part of this, i would be greatly thankful.

[Joshua Worth]

this isnt an advanced topic

[DilloDude]

To make the bullet move to the direction of the mouse, put this script in bullet's create actor:

Code: Select all

directional_velocity = 10;
angle = direction(xscreen, yscreen, xmouse, ymouse);


To make the bullet come out of the end of the gun, first check the animation. The path the tip of the gun travels should be close to a circle. You need to know the coordinates of the center of this circle relative to the center of the animation. In the following examples, replace yoffset with the y coordinate, and xoffset with the xcoordinate. Replace gundist with the radius of the circle. Now we need some functions, add this in global code:

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float d2R(int degrees)
{
    return degrees * (3.1415926535897932384626433832795 / 180);
}


double xdist(int deg, double dist)
{
    return  dist * cos(d2R(deg));
}


double ydist(int deg, double dist)
{
    return -dist * sin(d2R(deg));
}

NOTE: the purpose of the d2r function is the same as that of the degtorad function. The effect should be the same if you replace d2r with degtorad. However, the d2r function works, so I have not tested it with the degtorad function. [/note]

On your actor that recieves the mouse-click, make an activation event to your player/gun actor. On that actor, add an activation event, script editor:

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double xcre;
double ycre;
double ang; = direction(xscreen, yscreen, xmouse, ymouse);

xcre = xoffset + xdist(ang, gundist);//if your circle center is the same as the animation center, just use xcre = xdist...
ycre = yoffset + ydist(ang, gundist);//see above

CreateActor("bullet", "bulletanim", "no parent", "no path", xcre, ycre, false);


Replace bullet with your bullet actor's name.
Replace bulletanim with your bullet;s animation name.

[SergeLo00001]

double ang; = direction(xscreen, yscreen, xmouse, ymouse);
i got invalid assignment for this line. confused by this part.

[SergeLo00001]

o, and since i want to clik to shoot the bullet wont there need to be a mouse button down event anywere?

[SergeLo00001]

i also dont understand were to put the second code u gave me.

[ondy1985]

double ang; = direction(xscreen, yscreen, xmouse, ymouse);
i got invalid assignment for this line. confused by this part.

remove the semicolon after the ang.

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double ang = direction(xscreen, yscreen, xmouse, ymouse);

[SergeLo00001]

double xcre;
double ycre;
double ang = direction(xscreen, yscreen, xmouse, ymouse);

xcre = 100 + xdist;
ycre = 7 + ydist;

CreateActor("shot", "shot", "no parent", "no path", xcre, ycre, false);




I get:
Warning Line 4: Trying acces a function without argumnts. The function wont execute. Try use: function();
Error line 4: Illegal pointer operation
(Reapeat for line 5)

Is it because i didnt do the second code in the global place yet? cause i dont know how to do that. If not, explain both of my problems please.

[makslane]

xdist and ydist are funtion.
To use, you need put the functions arguments.
In this case, angle and distance, for example:

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xcre = 100 + xdist(90, 3);

[SergeLo00001]

what do the 90 and the 3 mean

[SergeLo00001]

does anyone understand what dillo dude said about the path of the tip of the gun should be close to a circle. What circle is he talking about?

[DilloDude]

what do the 90 and the 3 mean

The 90 is the angle. in this case, striaght up. the 3 is the distance. So with these paramaters, ydist would return -3, and xdist would return 0. So you would use these parameters if your gun was pointing straight up, and the distance from the tip of the gun to the reference point is three. If instead of 90, you put 180, straight left, xdist would return -3 and ydist would return 0.

Your gun should have an animation that starts with it pointing to the right, and rotates clockwise, about 10 degrees each frame. In draw actor, you can put:

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double ang = direction(xscreen, yscreen, xmouse, ymouse);
animpos = (ang / 360) * nframes;

This will make your gun point toward the mouse. This will be more accurate if the axis of rotation (ie. the center of the circle) is in the center of the animation. Make sure that on creat actor, you change the anim direction to STOPPED.

[SergeLo00001]

ooooooooo, i get it now. Thanks!

[SergeLo00001]

can someone please explain to me why sometimes when i add animation it takes out the non rectagle image from the file like i want to, and sometimes it takes the whole image. What is it that makes the difference?
ie:
whole image
////////////////
////////////////
ooo///////////
oooooo///////
oooooo///////
ooo///////////
////////////////

what i want


ooo
oooooo
oooooo
ooo


you know what i mean?

[Game A Gogo]

make sure that top left corner is the trnsparent!

~Fred~