adding physics to straight drawn lines

Games
#1

Hi, I’m pretty new to Corona, and am having trouble with adding physics to lines being drawn by the user, I’m basing the line generation off of this code

[lua] function drawLine( event )
if(event.phase == “ended”) then
line = display.newLine(event.xStart, event.yStart, event.x, event.y)
line:setColor(255,0,0)
line.width = 5
end
end
Runtime:addEventListener(“touch”, drawLine) [/lua]

so all of my lines will be different lengths, directions,rotations and whatnot, my question is how do I set up a physics shape around the line that wont include extra space? I’ve tried setting up my own shape for it but i can’t seem to get it right, or even close to right [import]uid: 80180 topic_id: 13856 reply_id: 313856[/import]

#2

http://developer.anscamobile.com/code/draw-line

I saw this in the code exchange. Never tried it but the description seems to fit what you are looking for. [import]uid: 31262 topic_id: 13856 reply_id: 50973[/import]

#3

Yeah i have seen that code before, and at first it seemed like a very indirect way of giving the line physics, but the more i look at it the more i think it might be the answer. Thanks! [import]uid: 80180 topic_id: 13856 reply_id: 51044[/import]

#4

Unfortunately, what your looking for is very difficult. I have been trying to find another way too. [import]uid: 23689 topic_id: 13856 reply_id: 53601[/import]

#5

[lua]local lines = {}
local myLines = {}
local prevX,prevY

require ( “physics” )
physics.start()
physics.setGravity( 0, 7.5 )

local function removeLine(myLine)
for i=1,#myLine do
myLine[i]:removeSelf()
myLine[i] = nil
end
end

local i = 1
local function drawLine(e)
if “began” == e.phase then
myLines[i] = {}
prevX = e.x
prevY = e.y
elseif “moved” == e.phase then
if prevX then
myLines[i][#myLines[i] + 1] = display.newLine(prevX,prevY,e.x,e.y)
myLines[i][#myLines[i]].width = 3
physics.addBody(myLines[i][#myLines[i]], “static”, {density = 1.0, friction = 0.3, bounce = 0.2})
end
prevX = e.x
prevY = e.y
elseif “ended” == e.phase then
prevX = nil
prevY = nil
i = i + 1
–you can get to individual lines using this.
removeLine(myLines[#myLines-1])
end
end
Runtime:addEventListener(“touch”,drawLine)[/lua]

different line code, but that line is better :slight_smile:

you really should use google before posting… [import]uid: 79135 topic_id: 13856 reply_id: 53634[/import]