[Tutor] Livewires questions

[Eric Brunson]

Tonu Mikk wrote:
> Eric Brunson wrote:
>   
>> Tiger12506 wrote:
>>   
>>     
>>>> Based on your guidance, I figured it out.  I need to use a return 
>>>> statement, which I had not encountered before.  Now I wrote my 
>>>> definitions in this way:
>>>>
>>>> def collided():
>>>>    if player_x == robot_x+0.5 and player_y == robot_y+0.5:
>>>>       return True
>>>>     
>>>>       
>>>>         
>> Granting that I have not looked at any of the Livewires modules, I just 
>> wanted to say...
>>
>> A general check for collision would probably involve the distance 
>> formula from geometry
>>
>> collided( (x1,y1), (x2,y2) ):
>>    return( sqrt( (x1-x2)**2 + (y1-y2)**2 ) < 1 )
>>
>> but could probably be simplified to something like:
>>
>> def collided( (x1,y1), (x2,y2) ):
>>    return( abs( x1 - x2 ) < .5 and abs( y1 - y2 ) < .5 )
>>
>>   
>>     
> Thanks Eric for your suggestions.  I believe Livewires modules have 
> simplified collision checking for programming novices like myself.  
> There are two shapes that I am working with, a circle and a square.  The 
> position of the circle is defined by the center coordinates whereas the 
> position of the square is defined by the lower left corner of the 
> square.  When my circle is 0.5 points in diameter, I can add this much 
> to both x and y coordinates of the square which will then give me the 
> point where the square is sitting on top of the circle.  It took me a 
> long time to figure this out.  I had to re-read the Graphics guide sheet 
> that came with Livewires multiple times to try to get it to work 
> correctly.  I believe this part of my code is OK. 
>
>   

Good deal and good luck.