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Notthebbq

Mon Apr 04, 2011 1:14 pm


how to move an image

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my group member wants to know how to move an image around the screen with out use of arrow keys (ie: an NPC/AI) and if you could explain it simply would be nice


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apython1992

Mon Apr 04, 2011 1:23 pm


RE:how to move an image

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Well, if you are using the arrow keys to move an image, you would be watching the event queue for a KEYDOWN event, which is a conditional, correct?

Pseudocode
[code]
if KEYDOWN(left_arrow):
    image_x -= 1
[/code]

and so on.  With an AI, moving the image is the same, in that you change its position.  It's just the condition that's different (not a button pressed, but perhaps its position relative to the tower and which direction the path follows).


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Notthebbq

Mon Apr 04, 2011 1:27 pm


Re: how to move an image

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Thanks for the advice, I was just wondering if you could elaborate on the whole AI moving part, like an example code would be really helpful. I kind of knew of the moving with keyboard solution. 
Thanks again.


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Insectoid

Mon Apr 04, 2011 1:32 pm


RE:how to move an image

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Say we have a loop. Inside that loop we have image_x += 1. If we execute that loop, the image will move in the +x direction. 

Similarly, we can do something like
[code]
if my_dog_is_male :
    image_x += 1
[/code]

alternatively;
[code]
if i_want_to_go_left:
    image_x += 1
[/code]

Whether or not you want to go left is an entirely different question.


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Tony

Mon Apr 04, 2011 2:41 pm


RE:how to move an image

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Most NPCs are scripted -- they don't make decisions, just follow the actions described in some text-file.

Basic AIs come down to a very simple model: what is the current world state? What move should I make this turn for this state? Repeat.