LÖVE

Posted: **Mon Dec 24, 2012 12:48 pm**

Well I am trying to think how I would make the Arrow move

I don't really know how to go about making it but I guess I would need to use

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table.insert
table.remove

to add in the new arrows
and I would also need to get the direction between the player and the mouse

So how can I go about making this ANY info is appreciated

Also I am using love.physics for pretty much everything

My love file

Posted: **Mon Dec 24, 2012 12:59 pm**

ixjackinthebox wrote: I don't really know how to go about making it but I guess I would need to use
Code: Select all
table.insert
table.remove

This might help.

ixjackinthebox wrote: and I would also need to get the direction between the player and the mouse
My love file

Let mx, my be the actual mouse position
let x,y be the player position.
This will return the (clockwise) angle between the player and the mouse, in radians

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local angle = math.atan2(my - y, mx - x)

Seen in this very helpful angle visualizer, from BlackBulletIV.
Also featured on the wiki.

Posted: **Mon Dec 24, 2012 9:23 pm**

Can someone tell me why this is wrong

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function love.mousepressed( MX, MY, button )
	--Arrow
	if button == "l" then
		Table_pos = Table_pos + 1
		table.insert(Objects.Arrow.body, Table_pos, love.physics.newBody( World, ArrowX, ArrowY, "dynamic"))
		table.insert(Objects.Arrow.shape, Table_pos, love.physics.newRectangleShape( 10, 3 ))
		table.insert(Objects.Arrow.fixture, Table_pos, love.physics.newFixture( Objects.Arrow.body , Objects.Arrow.shape, 1 ))
		--ArrowDraw = 1
			--Objects.Arrow.body:applyForce( MX, MY )
	
	end
end

I don't really know to set up the tables so it will create a new arrow and be able to show and hide the arrows individually

Edit:Can someone please tell me how to set the tables up properly.

Posted: **Fri Dec 28, 2012 1:09 am**

Anyone...?

Posted: **Fri Dec 28, 2012 10:40 am**

You really no need a variable to save the number of elements in the table. You can use table.getn to obtain it.

I even recommend using this method because a variable could be modified wrong in your code and would lead to errors very hard to detect.

Other than that, I can't see anything wrong with your code, assuming that every variable is working as expected.

Posted: **Fri Dec 28, 2012 11:24 am**

Ubermann wrote:You can use table.getn to obtain it.

getn is deprecated and should not be used, I think it's even been removed for 5.2. Use the # operator instead.

Posted: **Fri Dec 28, 2012 1:40 pm**

This will not help you solving the problem you got but you may want to look into your code cuz i get only 7fps on my leptop

Posted: **Fri Dec 28, 2012 2:38 pm**

bartbes wrote:
Ubermann wrote:You can use table.getn to obtain it.
getn is deprecated and should not be used, I think it's even been removed for 5.2. Use the # operator instead.

Oh, didn't know, Thanks for the tip.

Posted: **Sat Dec 29, 2012 11:53 am**

What I want to try and do is on mouse press create a table like this one.

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        Objects.Arrow = {}
	Objects.Arrow.body = love.physics.newBody( World, ArrowX, ArrowY, "dynamic")
	Objects.Arrow.shape = love.physics.newRectangleShape( 10, 3 )
	Objects.Arrow.fixture = love.physics.newFixture( Objects.Arrow.body , Objects.Arrow.shape, 1 )
	Objects.Arrow.fixture:setUserData("Arrow")

But I would also need to be able to draw the arrow only after it has been shot and then remove the arrow when it goes out the games area.
But the thing I need help with how the tables should be done

This will not help you solving the problem you got but you may want to look into your code cuz i get only 7fps on my leptop

That might be because it uses love.physics for all of the controls

Posted: **Sat Dec 29, 2012 12:43 pm**

Maybe something like this?

A table to store the arrows.

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arrows = {}

Creating a local arrow table, and then inserting it into the table of arrows.

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function create_arrow(x, y)
	local arrow = {}
	arrow.body = love.physics.newBody( World, x, y, "dynamic")
	arrow.shape = love.physics.newRectangleShape( 10, 3 )
	arrow.fixture = love.physics.newFixture( arrow.body , arrow.shape, 1 )
	arrow.fixture:setUserData("Arrow")

	table.insert(arrows, arrow)
end

And looping over all of the arrows to check if they're offscreen, and if they are, removing them from the table. (Note that this for loop uses pairs, not ipairs.)

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function remove_offscreen_arrows()
	for key, arrow in pairs(arrows) do
		if is_offscreen(arrow) then
			arrows[key] = nil
		end
	end
end

And calling them.

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function love.update(dt)
	remove_offscreen_arrows()
end

function love.mousepressed(x, y)
	create_arrow(x, y)
end

I hope this helps!

LÖVE

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