Help: Turn Based Strategy game

[oventoaster]

I am currently building a turn based strategy game using Python/pygame. While unit spawning, movement and turn order work perfectly, I have hit a snag in the combat block.


Say for example, I use a Red archer to attack a Blue Archer, as shown here:

if mouseX in range(bluA.rect.left, bluA.rect.right) and mouseY in range(bluA.rect.top, bluA.rect.bottom):

						-snip-

						if redA.selected == 1:

							if bluA.rect.center - redA.rect.center >= (50, 50) and bluA.rect.center - redA.rect.center <= (300, 300):

								print 'The red archer attacks the blue archer'

						-snip-

the (if mouseX in range...) tests if a Blue Archer is being attacked



the (if redA.selected == 1) lets pygame know that a Red archer is attacking a Blue archer



if bluA.rect.center - redA.rect.center >= (50, 50) and bluA.rect.center - redA.rect.center <= (300, 300): print 'The red archer attacks the blue archer'



This should check if the Red archer can attack within it's range - which is between 50 and 300 pixels away. Since in this situation, the Red Archer is in range, I initiate the attack.



When I initiate the attack, this error comes up:

Traceback (most recent call last):

  File "C:\Users\Oventoaster\Desktop\Table Wars\Table Wars.py", line 770, in <module>

	main()

  File "C:\Users\Oventoaster\Desktop\Table Wars\Table Wars.py", line 152, in main

	if bluA.rect.center - redA.rect.center >= (50, 50) and bluA.rect.center - redA.rect.center <= (300, 300):

TypeError: unsupported operand type(s) for -: 'tuple' and 'tuple'

and the game freezes.


My question is this: How do I check if the Red archer is in range to attack the Blue Archer? Can the same be done for the Blue archer when he attacks?

 

[bzar]

This would give you circular attack area (remember pythagoras? a² + b² = c²):

distanceSquared = (bluA.rect.center.x - redA.rect.center.x) ** 2 + (bluA.rect.center.y - redA.rect.center.y) ** 2

if distanceSquared >= 50**2 and distanceSquared <= 300**2:

  ...

If you want rectangular (diamond-shape):

distance = abs(bluA.rect.center.x - redA.rect.center.x) + abs(bluA.rect.center.y - redA.rect.center.y)

if distance >= 50 and distance <= 300:

  ...

If you want rectangle:

minDistance = min(abs(bluA.rect.center.x - redA.rect.center.x), abs(bluA.rect.center.y - redA.rect.center.y))

maxDistance = max(abs(bluA.rect.center.x - redA.rect.center.x), abs(bluA.rect.center.y - redA.rect.center.y))

if minDistance >= 50 and maxDistance <= 300:

  ...

EDIT: Tuples are not vectors in the mathematical sense. You can't calculate with them.

 

[oventoaster]

This would give you circular attack area (remember pythagoras? a² + b² = c²):

distanceSquared = (bluA.rect.center.x - redA.rect.center.x) ** 2 + (bluA.rect.center.y - redA.rect.center.y) ** 2

if distanceSquared >= 50**2 and distanceSquared <= 300**2:

  ...

If you want rectangular (diamond-shape):

distance = abs(bluA.rect.center.x - redA.rect.center.x) + abs(bluA.rect.center.y - redA.rect.center.y)

if distance >= 50 and distance <= 300:

  ...

If you want rectangle:

minDistance = min(abs(bluA.rect.center.x - redA.rect.center.x), abs(bluA.rect.center.y - redA.rect.center.y))

maxDistance = max(abs(bluA.rect.center.x - redA.rect.center.x), abs(bluA.rect.center.y - redA.rect.center.y))

if minDistance >= 50 and maxDistance <= 300:

  ...

EDIT: Tuples are not vectors in the mathematical sense. You can't calculate with them.

I tried what you said for diamond shape, but now I'm getting a different error:

Traceback (most recent call last):

  File "C:\Users\Oventoaster\Desktop\Table Wars\Table Wars.py", line 772, in <module>

	main()

  File "C:\Users\Oventoaster\Desktop\Table Wars\Table Wars.py", line 166, in main

	distance = abs(bluA.rect.center.x - redA.rect.center.x) + abs(bluA.rect.center.y - redA.rect.center.y)

AttributeError: 'tuple' object has no attribute 'x'

Do I use pos_x rather than x?

 

[bzar]

Oh right [0] for x and [1] for y.


EDIT: for example

distanceSquared = (bluA.rect.center[0] - redA.rect.center[0]) ** 2 + (bluA.rect.center[1] - redA.rect.center[1]) ** 2

actually looking at pygame documentation:

distanceSquared = (bluA.rect.centerx - redA.rect.centerx) ** 2 + (bluA.rect.centery - redA.rect.centery) ** 2

should work

 

[oventoaster]

[0] for x and [1] for y? I get syntax errors when I do that. If it helps, I'm running on Windows 7

 

[bzar]

Check the latter example. I'm guessing you're quite new to python, no?

 

[oventoaster]

Didn't see the edits there. Thanks a lot!


Also, yeah, I have one month of experience

 

[diligentcircle]

The Rect class also has centerx and centery attributes.

 

[bzar]

onpon4:

actually looking at pygame documentation:

distanceSquared = (bluA.rect.centerx - redA.rect.centerx) ** 2 + (bluA.rect.centery - redA.rect.centery) ** 2

should work

 

[diligentcircle]

Ah, I guess I missed that. :lol: