Darwinbots Forum
Code center => Suggestions => Topic started by: abyaly on April 27, 2006, 10:21:06 PM
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I was looking through the wiki and though I found refvars for x pos and y pos, I was surprised these werent in there. Since there are no trig functions either, I can't find a way to make bots calculate them accurately.
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there is refxpos (http://www.darwinbots.com/WikiManual/index.php?title=.refxpos), is that what you're looking for?
It is possible to emulate sin and cos using numerical approximations. I did that way back in the day before there was refvel*.
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refxpos gives the x coordinate
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Yes, and refypos gives the y coordinate.
Is that what you're looking for?
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no. I was looking for the vars in the topic. they dont exist. so I didnt find them
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No, they don't exist. But neither does .explode or .becomeagod.
What is it you would expect the vars in your topic to do?
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No, they don't exist. But neither does .explode or .becomeagod.
What is it you would expect the vars in your topic to do?
upon thinking this over, I have found reason for those vars not to exist, so never mind ^^
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Hey abyaly, pay no attention to Nums. It's my fault really. He's a good monkey, but he gets cranky when he's hungry. I'm supposed to feed him when PY is away, but I forgot....
The refvars that do exist are mostly just a convienent shortcut to using the memloc/memval pair. We could add refvars for everything, but that would be a lot of work and double the size of the bot's memory array...
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I just didn't understand his post. refdnpos would presumably provide the "down position" of the bot in your eye5. What is a "down position"? Is it the distance to the bot expressed as units needed to store in .dn to get to that bot's coordinates?
Anyway, after a little thought, I think you just need to use dist and angle commands.
dist provides the distance to a set of coordinates from where you are now. angle provides the angle to a set of coordinates from where you are now.
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(warning: old topic)
I propose that the following sysvars be implemented:
.refup - the projection of the distance vector in the direction the bot is facing
.refdx - the " " " in the direction 90 degrees to the right
.refdn - the " " " in the direction opposite to the one the bot is facing
.refsx - the " " " in the direction 90 degrees to the left
Here is an example of how I would like these to work.
I have a bot whose coordinates are (100, 100)
He is looking at a bot that is at (200,200)
My bot is facing direction 0.
.refup would be 100.
.refdx would be 100.
.refdn would be -100
.refsx would be -100
Second example:
I have a bot whose coordinates are (100, 100)
He is looking at a bot that is at (200,200)
He is looking at direction 157.
.refup would be 0.
.refdx would be 141 ~= 100 * root 2
.refdn would be 0.
.refsx would be -141
General case:
I have a bot looking at another bot.
my bot is facing direction a. the angle between my bot and the other bot is b.
z = a - b (the amount of clockwise rotation necessary for my bot to be looking directly at the other bot)
d = the distance between the bots
.refup = d * cos (z)
.refdx = d * sin (z)
.refdn = d * -cos (z)
.refsx = d * -sin (z)
(These figures might not be right; I will check them again when I have more time today)
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These would be a good replacement for the current refxpos and refypos. Express distances in terms of the bots internal frame of reference.