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Author Topic: Moving a sprite?  (Read 2164 times)

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Diaf

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Moving a sprite?
« on: July 22, 2009, 11:32:53 AM »

OK I may be doing this very badly since our game is 3D so we have not looked at sprites and stuff much at all.

We have a character that wants to throw something. So we figured we'd just have a 3D model with a 'throwing' animation and once it plays we'll draw a sprite to screen and then use a loop to movie it across the screen till it gets where it needs to be.

So I made an entity which contains the image of the thrown item, and in the script I have this code:

Code: [Select]

        var thrown = Scene.LoadEntity("entities\item\item.entity");

thrown.SkipTo(4355, 725);
thrown.Visible = true;

while(thrown.X != 4665)
{
thrown.SkipTo((thrown.X + 10), 725);
Sleep(100);
}


Is there a more elegant or better looking way to do this?
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metamorphium

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Re: Moving a sprite?
« Reply #1 on: July 22, 2009, 03:04:07 PM »

I don't think that throwing anything using the straight line works well... You should check this site for some inspiration and then use a curve for throwing instead of standard line. Note that two things appear when you throw an item - 1. it goes along a curved trajectory, 2. it changes speed. Both can be easily achieved in wme. Speed via the Sleep() and trajectory via x,y position.

To make the game faster, I always precalculate the trajectories into numeric delta value arrays and then simply read through the array and apply dx and dy to the item. This way it works without a glitch and nicely in the realtime.

http://www.knifethrowing.info/physics_of_knife_throwing.html

Edit: 3. It also rotates along it's axis. You can do this using the Rotate parameter of an entity.
« Last Edit: July 22, 2009, 03:10:44 PM by metamorphium »
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