Hi Folks,
I'am pretty busy at the moment on developing a APP of the month ;) and have a lot of stuff working so far.
Only thing i wan't to implement is the following, now it works on single touches.
I need the user to draw a line from one object, and after that the object follows the drawn path. Not so hard, there are some samples and even a full project with examples, cheers and thanks for that.
The drawing go's oke, but the only issue i'am fighting is the following:
When the user draws a line, i like to have a dashed line, like in flight control.
Example
-- -- -- -- -- -- -- -- --
But then also curved offcourse :)
Could anyone probably help me on this one.
Cheers,
Jespar
Hi.
I modified a little bit the line drawing code from gtatarkin.
The code didn't draw lines with the same length. Perhaps it helps to find a good solution.
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| -- original source code: Gesture recognition library for Corona SDK
-- http://developer.anscamobile.com/code/gesture-recognition-library-corona-sdk
-- modified 110324 by sidasa
local moved = 0
local pointsTable = {}
local line
local function drawLine ()
if line then
line:removeSelf()
end
local numPoints = #pointsTable
local nl = {}
local j, p
local linewidth = 5
nl[1] = pointsTable[1]
j = 2
p = 1
for i = 2, numPoints, 1 do
nl[j] = pointsTable[i]
j = j+1
p = i
end
if ( p < numPoints -1 ) then
nl[j] = pointsTable[numPoints-1]
end
if #nl > 2 then
line = display.newLine(nl[1].x,nl[1].y,nl[2].x,nl[2].y)
line.width = linewidth
line:setColor(0,0,0)
for i = 3, #nl, 1 do
-- draw next "step"
if #nl > i then
line = display.newLine(nl[i].x,nl[i].y,nl[i+1].x,nl[i+1].y)
else
line:append( nl[i].x,nl[i].y);
end
line.width = linewidth
-- change color every "step"
if i%2 == 0 then
line:setColor(0,0,0)
else
line:setColor(255,255,255)
end
end
end
end
local function Update(event)
if "began" == event.phase then
pointsTable = nil
pointsTable = {}
local pt = {}
pt.x = event.x
pt.y = event.y
table.insert(pointsTable,pt)
elseif "moved" == event.phase then
local pt = {}
pt.x = event.x
pt.y = event.y
table.insert(pointsTable,pt)
moved = 1 --
elseif "ended" == event.phase or "cancelled" == event.phase then
if( moved == 1 ) then
drawLine ()
moved = 0
end
end
end
Runtime:addEventListener( "touch", Update ) |
Thanks sidasa,
I will check it out if it will be usable and fast enough ;)
Cheers,
Jespar
Hey guys:
I am new to Lua and Corona SDK. I was wondering how would I modify the above code so that it does solid lines instead of dashes? Also, how can I have a object9(s) following the path of the draw line(s).
Thank you so much!
Willy J.
Actually I figured that out!...
But, I have another question though. How can I get it to paint as I touch across the screen?
Thanks,
Willy J.
Okay, I figured this one out as well!
Willy J.
views:2812 update：2011/9/29 19:21:19