| Re: Renegade Coordinates [message #434335 is a reply to message #434282] |
Sat, 07 August 2010 08:43  |
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BlueThen
Messages: 2402
Registered: February 2006
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General (2 Stars) |
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The one in your quote looks a little broken, TechnoBulldog.
From what I can tell, Commands->Get_Facing(obj) gets the angle of which an object is facing in degrees. (Commands->Get_Position(obj) is self explanatory).
In the equations
Position.X += static_cast<float>(1.5*cos(Facing*(PI/180)));
Position.Y += static_cast<float>(1.5*sin(Facing*(PI/180)));
we're pretty much taking Facing, and converting it to Radians (multiplying by PI/180). We convert it to Radians because cosine and sine are both built to handle values between 0 and 2*PI, or -PI and PI, whichever you prefer. Radians just take the range of values from 0-360 and maps it to 0-2PI.
Cosine and Sine both return values between -1 and 1, which makes it simple for us to change the distance at which our object is plotted. Multiplying 1.5 to these 2 values puts our objected 1.5 units from the center. Then, after finding out the coordinates where the position should be from the origin, we translate it by Position.X and Position.Y by adding this value to them.
So all what this does is take our coordinate Position and moves it 1.5 units towards an angle (Facing).
I said that the formula in your message looks broken because you have the * (PI / 180) outside of the trig functions, when they should be inside.
After getting this position, you can spawn your object and face it towards/away/perpendicular to the initial Position, all in a000clown's post.
Edit: I'm also on Nite-Serv. You can ask me for help on the math part, but I don't really know Renegade's API as much as Mike does.
[Updated on: Sat, 07 August 2010 08:45] Report message to a moderator |
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