Yes, I will try OpenGL but it is much more complicated than pure CD canvas.
I would have like to know if I was using things correctly with so much image
and canvas creation and killing?
I tried to do all that only with IM but I coud not find how to clip to
triangular shape.
I was also intrigued by server images.
Best
victor
----- Original Message -----
From: Antonio Scuri
To: IUP discussion list.
Sent: Tuesday, January 14, 2014 1:40 AM
Subject: Re: [Iup-users] teselation sample
Fantastic sample! Just added to the IM samples.
If you need graphics speed I suggest you do use OpenGL:
http://luagl.sourceforge.net/
Thanks,
Scuri
On Mon, Jan 13, 2014 at 8:36 PM, Victor Bombi <[email protected]> wrote:
Hello,
this is a sample i have made for testing cdCanvas and image.
You only have to set the path for your image file.
I am mailing this for two reasons:
1- I would like to have a sample like this one for learning some im and cd
functions that were not in the examples folder
2- I would like to know if something could be done better (a faster
alternative...)
-------------------------------------Sample begins
require"imlua"
require"cdlua"
require"cdluaim"
require"iuplua"
require"iupluacd"
require"imlua_process"
filename =
[[C:\LUA\im-3.8.2_Win32_dllw4_lib\im-3.8.2_Examples\im\html\examples\flower.jpg]]
--set your file
anchosc = 500 -- window width
heightfac=math.sqrt(3)*0.5;
image=im.FileImageLoad(filename)
cnv = iup.canvas{rastersize = anchosc .."x".. anchosc*heightfac, border =
"NO"}
function cnv:map_cb() -- the CD canvas can only be created when the
IUP canvas is mapped
self.canvas = cd.CreateCanvas(cd.IUP, self)
self.canvas:Background(cd.BLACK)
end
mouseX,mouseY=0,0
nostatus=(" "):rep(10)
function cnv:motion_cb(x,y,status)
if status == nostatus then
mouseX = x
mouseY = y
iup.Update(cnv)
end
end
function EQTriangle(can,len,mode)
mode = mode or cd.FILL
can:Begin(mode)
can:Vertex(0,0)
can:Vertex(len,0)
can:Vertex(len*0.5,0.5*len*math.sqrt(3))
can:End()
end
function clip(val,mini,maxi)
return math.max(mini,math.min(val,maxi))
end
function linearmap(v,s,e,ds,de)
return ((de-ds)*(v-s)/(e-s)) + ds
end
function imResize(im1,w,h)
local im2 = im.ImageCreateBased(im1,w,h)
im.ProcessResize(im1,im2,3)
return im2
end
function MaskTriang(img,size)
local im2 = img:Clone()
im2:AddAlpha()
local imcv = im2:cdCreateCanvas()
EQTriangle(imcv,size,cd.CLIP)
imcv:Clip(cd.CLIPPOLYGON)
img:cdCanvasPutImageRect(imcv, 0, 0, 0, 0, 0, 0, 0, 0)
imcv:Kill()
return im2
end
function Teselate(img,size)
local im2 = im.ImageCreateBased(img,size*2,size*2)
local imcv = im2:cdCreateCanvas()
--local ident = imcv:GetTransform()
--print("imcv:GetTransformation",imcv.GetTransform,ident)
img:cdCanvasPutImageRect(imcv, 0, 0, 0, 0, 0, 0, 0, 0)
imcv:TransformTranslate(1.5*size, size*0.5*math.sqrt(3))
imcv:TransformRotate(120)
img:cdCanvasPutImageRect(imcv, 0, 0, 0, 0, 0, 0, 0, 0)
imcv:Transform({1,0,0,1,0,0}) --reset identity
imcv:TransformTranslate(1.5*size, size*0.5*math.sqrt(3))
imcv:TransformRotate(-120)
img:cdCanvasPutImageRect(imcv, 0, 0, 0, 0, 0, 0, 0, 0)
imcv:TransformScale(1,-1)
img:cdCanvasPutImageRect(imcv, 0, 0, 0, 0, 0, 0, 0, 0)
imcv:Kill()
img:Destroy()
return im2
end
function EndTeselate(img,size)
local im2 = im.ImageCreateBased(img,size*2,size*2)
local imcv = im2:cdCreateCanvas()
img:cdCanvasPutImageRect(imcv, 0, 0, 0, 0, 0, 0, 0, 0)
imcv:TransformTranslate(1.5*size, size*0.5*math.sqrt(3))
imcv:TransformRotate(-120)
imcv:TransformScale(1,-1)
img:cdCanvasPutImageRect(imcv, 0, 0, 0, 0, 0, 0, 0, 0)
imcv:Transform({1,0,0,1,0,0}) --reset identity
imcv:TransformRotate(120)
imcv:TransformScale(1,-1)
img:cdCanvasPutImageRect(imcv, 0, 0, 0, 0, 0, 0, 0, 0)
imcv:Kill()
img:Destroy()
return im2
end
function cnv:action()
local width = anchosc
local lado = clip(mouseX,10,width)
self.canvas:Activate()
local size = lado
local imm = imResize(image,size,size)
local im2 = MaskTriang(imm,size)
while size < width do
im2 = Teselate(im2,size)
size = size * 2
end
im2 = EndTeselate(im2,size)
im2:cdCanvasPutImageRect(self.canvas, 0, 0, 0, 0, 0, 0, 0, 0)
imm:Destroy()
im2:Destroy()
end
dlg = iup.dialog{cnv}
function dlg:close_cb()
image:Destroy()
cnv.canvas:Kill()
self:destroy()
return iup.IGNORE -- because we destroy the dialog
end
dlg:show()
iup.MainLoop()
-------------------------Sample ends
Best Regards
victor bombi
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