Additive random line Texture

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Pakz	Created : 06 April 2019 Edited : 07 April 2019 Language : monkey2 Additive random line Texture Create a greyscale stone like texture Emscripten html5 version
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#Import "<std>" #Import "<mojo>" Using std.. Using mojo.. Global screenwidth:Int,screenheight:Int ' ' This effect creates a grey stone like texture ' Class effect Field w:Int,h:Int ' map array width and height Field tw:Float,th:Float 'tile width and height Field map:Float[,] 'our map that holds the texture (greyscale) Method New(w:Int,h:Int) Self.w = w Self.h = h Self.tw = float(screenwidth)/float(w) Self.th = Float(screenheight)/Float(h) ' Here we create our texture array map = New Float[w,h] ' Here we call the brush stroking method that creates the texture. ' we call it 20000 times in this setting. It takes a random position ' on the map and a random direction. For Local i:Int=0 Until w+h20 shootproj(Rnd(w),Rnd(h),Rnd(TwoPi)) Next End Method ' This is the painters brush. It takes a position ' and angle and strokes the brush for a certain distance. ' While it moves it increases the color value under the tip. Method shootproj(x:Float,y:Float,angle:Float) For Local i:Int=0 Until w+h x+=Cos(angle)/Rnd(1,10) y+=Sin(angle)/Rnd(1,10) If x<0 Or y<0 Or x>=w Or y>=h Then Exit map[x,y]+=1 If map[x,y]>255 Then map[x,y] = 255 Next End Method ' This draws the texture Method draw(canvas:Canvas) For Local y:Int=0 Until h For Local x:Int=0 Until w Local dx:Int=xtw Local dy:Int=yth Local a:Float=(1.0/255.0)Float(map[x,y]) canvas.Color = New Color(a,a,a) canvas.DrawRect(dx,dy,tw+1,th+1) Next Next End Method End Class Class MyWindow Extends Window Field myeffect:effect Method New() SeedRnd(Microsecs()) screenwidth = Width screenheight = Height myeffect = New effect(640,480) End method Method OnRender( canvas:Canvas ) Override App.RequestRender() ' Activate this method myeffect.draw(canvas) ' if key escape then quit If Keyboard.KeyReleased(Key.Escape) Then App.Terminate() End Method End Class Function Main() New AppInstance New MyWindow App.Run() End Function --v
Latest Update I was looking at a video of the coding train where liquid simulations were shown. I got some inspiration from that. Here in this snippet I have a array that acts as the image canvas. I have a function there that takes a x,y position and a angle. From that function it moves into that angle for a certain distance while adding the color intensity under it's position. This function gets called around 20000 times on a 640*480 image and the result is a stone like texture.

Comments
Saturday, 06 April 2019, 20:09
HoboBen	That's really pretty!
Sunday, 07 April 2019, 02:59
Pakz	Yeah, this one came out pretty well. And not many lines of code to do it. btw : I added a link to the emscripten page.

Additive random line Texture

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