ga.captureBackground()

camID = 0
runningBlobs = 0
cam = of.texture()

function setup()
        cam:allocate(CAPTURE_W,CAPTURE_H,GL_RGB)
end

function update()
        cam = ga.cameraTexture(camID)
        runningBlobs = ga.camBlobs(camID)
end

function draw()
   
        ga.background(0.0,1.0)
   
        // draw the live image from device
        of.setColor(255)
        cam:draw(0,0,OUTPUT_W,OUTPUT_H)
   
        of.pushMatrix()
        of.scale(OUTPUT_W/CAPTURE_W,OUTPUT_H/CAPTURE_H,1.0)
   
        for j=0, runningBlobs-1 do
       
                // draw contours for each blob detected
                of.setLineWidth(1)
                of.setColor(255)
                of.fill()
               
                of.beginShape()
                for i=0, ga.camBlobContourSize(camID,j)-1 do
                        x = ga.camBlobCPointX(camID,j,i)
                        y = ga.camBlobCPointY(camID,j,i)
                        of.vertex(x,y)
                end
                of.endShape(false)
               
        end

        of.popMatrix()

end

function keyReleased()
        if ga.key() == string.byte(' ') then
                ga.captureBackground(camID)
        end
end

Control the background subtraction capture from code. If you have three cameras connected on your machine, then you can use this funtion with 0, 1 or 2 as specified camera device; the order will be the same order of openFrameworks console listing available devices, or instead the videoTracking tab order in GAmuza GUI.
Be sure to activate the video tracking module in the settingManager and have, at least, one camera connected and up&running, in order to have this function working.

ga.captureBackground(device)

device

the camera device id

None.

Shaders examples from ofx.fx() class.
This example shows the blur effect.
Original addon from patriciogonzalezvivo https://github.com/patriciogonzalezvivo/ofxFX

/*
   
 GAmuza 0.4.1 examples
 ---------------------
 Shaders/blur.ga
 
 Shaders examples from ofx.fx addon
 <https://github.com/patriciogonzalezvivo/ofxFX>;
 this example shows the blur effect.
 
 created by n3m3da | www.d3cod3.org
 
*/

_blur = ofx.blur()
cam = of.texture()

function setup()
    cam:allocate(CAPTURE_W,CAPTURE_H,GL_RGB)
    _blur:allocate(CAPTURE_W,CAPTURE_H)
    _blur:setPasses(6)
end

function update()
        cam = ga.cameraTexture(0)
        _blur:setRadius(ga.mouseX()/OUTPUT_W*10)
end

function draw()
        ga.background(0.0,1.0)
   
        _blur:beginFx()
                of.setColor(255)
                cam:draw(0,0)
                of.circle(ga.mouseX(),ga.mouseY(),5)
        _blur:endFx(true)

        of.pushMatrix()
        of.scale(OUTPUT_W/CAPTURE_W,OUTPUT_H/CAPTURE_H,1)
                of.setColor(255)
                _blur:draw(0,0)
        of.popMatrix()
       
        of.setColor(255)
        cam:draw(0,0)
   
end

Shaders examples from ofx.fx() class.
This example shows how to composite from different effects.
Original addon from patriciogonzalezvivo https://github.com/patriciogonzalezvivo/ofxFX

/*
   
 GAmuza 0.4.1 examples
 ---------------------
 Shaders/composite.ga
 
 Shaders examples from ofx.fx addon
 <https://github.com/patriciogonzalezvivo/ofxFX>;
 this example shows how to composite from different effects.
 
 created by n3m3da | www.d3cod3.org
 
*/

oldTv = ofx.oldTv()
blur = ofx.blur()
maskFx = ofx.mask()
mask = of.image()
cam = of.texture()

function setup()
    mask:loadImage("images/mask.png")
    mask:resize(OUTPUT_W,OUTPUT_H)
    maskFx:allocate(OUTPUT_W,OUTPUT_H)
    blur:allocate(OUTPUT_W,OUTPUT_H)
    blur:setPasses(10)
    oldTv:allocate(OUTPUT_W,OUTPUT_H)
    oldTv:setRows(0.01)
    oldTv:setBrightness(1.0)
    cam:allocate(CAPTURE_W,CAPTURE_H,GL_RGB)
end

function update()
    cam = ga.cameraTexture(0)
    blur:setRadius(ga.mouseX()/100)
end

function draw()
        ga.background(0.0,1.0)
   
        // draw the camera inside blur fx
        blur:beginFx()
                of.setColor(255)
                cam:draw(0,0,OUTPUT_W,OUTPUT_H)
        blur:endFx(false)
   
    // create a mask
        maskFx:beginMask()
                of.setColor(255*ga.mouseY()/OUTPUT_H)
                mask:draw(0,0)
        maskFx:endMask()
   
        // draw the camera with the mask
        maskFx:beginFx()
                cam:draw(0,0,OUTPUT_W,OUTPUT_H)
        maskFx:endFx(false)

        // draw the masked camera on top of the blurred camera
        // all inside the oldTV effect
        oldTv:beginFx()
                blur:draw(0,0)
                maskFx:draw(0,0)    
        oldTv:endFx(false)
       
        // finally draw the oldTV container
        oldTv:draw(0,0)
   
end

Simple example for loading a shader inside an FBO texture.

Simple example for loading a shader inside an FBO texture.

/*
   
 GAmuza 0.4.1 examples
 ---------------------
 Shaders/FBOWithShader.ga
 
 Simple example for loading a shader inside an FBO texture.
 
 created by n3m3da | www.d3cod3.org
 
*/

fboTex = of.fbo()
shader = of.shader()
start = true

function setup()
    of.setCircleResolution(6)
    // allocate(width,height,color range,samples)
    fboTex:allocate(OUTPUT_W,OUTPUT_H,GL_RGB,0)  
    shader:load(ga.importFile("noise"))
end

function update()
   
end

function draw()
        ga.background(0.0,1.0)
   
        // draw inside de FBO texture
        fboTex:beginFbo() // start FBO
        shader:beginShader() // start shader
       
                // clean the FBO just once at beginning
                if start then
                        start = false
                        of.clear(0,0,0,255)
                end
               
                // simulate trails effect
                of.enableAlphaBlending()
                of.fill()
                of.setColor(0,0,0,7)
                of.rect(0,0,fboTex:getWidth(),fboTex:getHeight())
                of.disableAlphaBlending()
               
                // draw a red circle
                of.setColor(19,170,211)
                of.circle(of.randomuf()*fboTex:getWidth(), of.randomuf()*fboTex:getHeight(), 200)
               
        shader:endShader() // close shader
        fboTex:endFbo() // close FBO

        // draw the FBO with shader
        of.setColor(255)
        fboTex:draw(0,0,OUTPUT_W,OUTPUT_H)
   
end

Shaders examples from ofx.fx() class.
This example shows the glow effect.
Original addon from patriciogonzalezvivo https://github.com/patriciogonzalezvivo/ofxFX

/*
   
 GAmuza 0.4.1 examples
 ---------------------
 Shaders/glow.ga
 
 Shaders examples from ofx.fx addon
 <https://github.com/patriciogonzalezvivo/ofxFX>;
 this example shows the glow effect.
 
 created by n3m3da | www.d3cod3.org
 
*/

glow = ofx.glow()
cam = of.texture()

function setup()
        cam:allocate(OUTPUT_W,OUTPUT_H,GL_RGB)
        glow:allocate(OUTPUT_W,OUTPUT_H)
        glow:setPasses(6)
   
end

function update()
        cam = ga.cameraTexture(0)
        glow:setRadius(ga.mouseX()/OUTPUT_W*20)
end

function draw()
        ga.background(0.0,1.0)

        glow:beginFx()
                of.setColor(255)
                cam:draw(0,0,OUTPUT_W,OUTPUT_H)
        glow:endFx(false)


        glow:draw(0,0)
       
end

Shaders examples from ofx.fx() class.
This example shows the grayscott algorithm effect.
Original addon from patriciogonzalezvivo https://github.com/patriciogonzalezvivo/ofxFX

/*
   
 GAmuza 0.4.1 examples
 ---------------------
 Shaders/grayscott.ga
 
 Shaders examples from ofx.fx addon
 <https://github.com/patriciogonzalezvivo/ofxFX>;
 this example shows the grayscott algorithm effect.
 
 created by n3m3da | www.d3cod3.org
 
*/

grayscott = ofx.grayScott()
cam = of.texture()

function setup()
    cam:allocate(CAPTURE_W,CAPTURE_H,GL_RGB)
    grayscott:allocate(CAPTURE_W,CAPTURE_H)
    grayscott:setIterations(5)
    grayscott:setDiffV(0.01)
end

function update()
    cam = ga.cameraTexture(0)
end

function draw()
    ga.background(0.0,1.0)

        grayscott:beginFx()
                of.setColor(10)
                cam:draw(0,0)
        grayscott:endFx(false)
       
        of.pushMatrix()
        of.scale(OUTPUT_W/CAPTURE_W,OUTPUT_H/CAPTURE_H,1)
                grayscott:draw(0,0)
        of.popMatrix()
       
end

Shaders examples from ofx.fx() class.
This example shows the oldTv effect.
Original addon from patriciogonzalezvivo https://github.com/patriciogonzalezvivo/ofxFX

/*
   
 GAmuza 0.4.1 examples
 ---------------------
 Shaders/oldTV.ga
 
 Shaders examples from ofx.fx addon
 <https://github.com/patriciogonzalezvivo/ofxFX>;
 this example shows the oldTv effect.
 
 created by n3m3da | www.d3cod3.org
 
*/

oldTv = ofx.oldTv()
cam = of.texture()

function setup()
        cam:allocate(CAPTURE_W,CAPTURE_H,GL_RGB)
        oldTv:allocate(OUTPUT_W,OUTPUT_H)
end

function update()
        cam = ga.cameraTexture(0)
        oldTv:setRows(ga.mouseX()/OUTPUT_W)
        oldTv:setBrightness(1.0)
end

function draw()
        ga.background(0.0,1.0)
   
        oldTv:beginFx()
                of.setColor(255)
                cam:draw(0,0,OUTPUT_W,OUTPUT_H)
        oldTv:endFx(true)

        of.enableAlphaBlending()
        oldTv:draw(0,0)
        of.disableAlphaBlending()
end

Shaders examples from ofx.fx() class.
This example shows the mask effect.
Original addon from patriciogonzalezvivo https://github.com/patriciogonzalezvivo/ofxFX

/*
   
 GAmuza 0.4.1 examples
 ---------------------
 Shaders/mask.ga
 
 Shaders examples from ofx.fx addon
 <https://github.com/patriciogonzalezvivo/ofxFX>;
 this example shows the mask effect.
 
 created by n3m3da | www.d3cod3.org
 
*/

maskFx = ofx.mask()
top = of.image()
bottom = of.image()
mask = of.image()

function setup()
    top:loadImage(ga.importFile("misteryMen0.jpg"))
    mask:loadImage(ga.importFile("horizontalMask.png"))
    mask:resize(top.width,top.height)
    bottom:loadImage(ga.importFile("misteryMen1.jpg"))
    maskFx:allocate(top.width,top.height)
end

function draw()
        ga.background(0.0,1.0)

        // create mask
        maskFx:beginMask()
                of.clear(255,255)
                of.setColor(255)
                mask:draw(0,ga.mouseY()-(OUTPUT_H/2 - top.height/2))
        maskFx:endMask()
   

        of.pushMatrix()
        of.translate(OUTPUT_W/2 - top.width/2, OUTPUT_H/2 - top.height/2,0)
       
        // draw the base image
        of.setColor(255)
        bottom:draw(0,0)
   
    // draw the masked image
        maskFx:beginFx()
                top:draw(0,0)
        maskFx:endFx(true)
        of.popMatrix()
end/h4> ]]> http://gamuza.d3cod3.org/examples/mask/feed/ 0 http://gamuza.d3cod3.org/examples/ch2_attractrepel/ http://gamuza.d3cod3.org/examples/ch2_attractrepel/#comments Wed, 19 Sep 2012 13:32:55 +0000 n3m3da http://gamuza.d3cod3.org/?p=2120

This example is one of the series of GAmuza adaptation to Daniel Shiffman Nature of Code
book examples.

More info: http://www.shiffman.net/teaching/nature/

/*
   
 GAmuza 0.4.1 examples
 ---------------------
 Shiffman_NatureOfCode/CH2_attractRepel.ga
 
 This example is one of the series of GAmuza adaptation to
 Daniel Shiffman <Nature of Code> book examples.
 
 More info: <http://www.shiffman.net/teaching/nature/>
 
 created by n3m3da | www.d3cod3.org
 
*/

dofile(ga.importFile("classes/Mover.ga"))
dofile(ga.importFile("classes/Attractor.ga"))


g = 1
NUM_MOVERS = 20
movers = {}
a = Attractor()

function setup()
        of.setCircleResolution(50)
        for i=0,NUM_MOVERS-1 do
                movers[i] = Mover(of.random(4,12),of.random(OUTPUT_W),of.random(OUTPUT_H))
        end
end

function update()
        for i=0,NUM_MOVERS-1 do
                for j=0,NUM_MOVERS-1 do
                        if i != j then
                                force = of.vec2f()
                                force = movers[j]:repel(movers[i])
                                movers[i]:applyForce(force)
                        end
                end

                attraction = of.vec2f()
                attraction = a:attract(movers[i])
                movers[i]:applyForce(attraction)
                movers[i]:update()
                movers[i]:checkEdges()
        end
end

function draw()
        ga.background(1.0,0.1)

        a:display()

        for i=0,NUM_MOVERS-1 do
                movers[i]:display()
        end
end
//-------------------------------------
// Attractor Class

class 'Attractor'

function Attractor:__init()
    self.mass = 60
    self.loc = of.vec2f(OUTPUT_W/2,OUTPUT_H/2)
    self.dragging = false
    self.rollover = false
    self.drag = of.vec2f(0,0)
end

function Attractor:attract(mover)
    force = of.vec2f()
    force = self.loc - mover.loc
    d = force:length()
    d = of.clamp(d,5.0,25.0)
    force:normalize()
    strength = (g*self.mass*mover.mass) / math.pow(d,2)
    force = force * strength
    return force
end

function Attractor:display()
    of.setColor(0)
    of.noFill()
    of.circle(self.loc.x,self.loc.y,self.mass)
    of.fill()
    if self.dragging then
        of.setColor(50)
    elseif self.rollover then
        of.setColor(100)
    else
        of.setColor(0)
    end
    of.circle(self.loc.x,self.loc.y,self.mass)
end

function Attractor:isClicked(mx,my)
    d = of.dist(mx,my,self.loc.x,self.loc.y)
    if d < self.mass then
        self.dragging = true
        self.drag:set(self.loc.x - mx,self.loc.y - my)
    end
end

function Attractor:isRollover(mx,my)
    d = of.dist(mx,my,self.loc.x,self.loc.y)
    if d < self.mass then
        self.rollover = true
    else
        self.rollover = false
    end
end

function Attractor:stopDragging()
    self.dragging = false
end

function Attractor:drag()
    if self.dragging then
        self.loc:set(ga.mouseX() + self.drag.x,ga.mouseY() + self.drag.y)
    end
end
//-------------------------------------
//-------------------------------------
// Mover Class

class 'Mover'

function Mover:__init(m,x,y)
    self.mass = m
    self.loc = of.vec2f(x,y)
    self.vel = of.vec2f(0,0)
    self.acc = of.vec2f(0,0)
end

function Mover:applyForce(force)
    f = of.vec2f()
    f = force / self.mass
    self.acc = self.acc + f
end

function Mover:update()
    self.vel = self.vel + self.acc
    self.loc = self.loc + self.vel
    self.acc = self.acc * 0
end

function Mover:display()
    of.setColor(0)
    of.noFill()
    of.circle(self.loc.x,self.loc.y,self.mass*2)
    of.setColor(175,200)
    of.fill()
    of.circle(self.loc.x,self.loc.y,self.mass*2)
end

function Mover:repel(mover)
    force = of.vec2f()
    force = self.loc - mover.loc
    distance = force:length()
    distance = of.clamp(distance,1.0,10000.0)
    force = force:normalize()

    strenght = (g*self.mass*mover.mass) / math.pow(distance,2)
    force = force * (1-strenght)
    return force
end

function Mover:checkEdges()
    if self.loc.x > OUTPUT_W then
        self.loc.x = OUTPUT_W
        self.vel.x = self.vel.x * -0.9
    elseif self.loc.x < 0 then
        self.loc.x = 0
        self.vel.x = self.vel.x * -0.9
    end

    if self.loc.y > OUTPUT_H then
        self.loc.y = OUTPUT_H
        self.vel.y = self.vel.y * -0.9
    elseif self.loc.y < 0 then
        self.loc.y = 0
        self.vel.y = self.vel.y * -0.9
    end
end
//-------------------------------------

]]> http://gamuza.d3cod3.org/examples/ch2_attractrepel/feed/ 0 http://gamuza.d3cod3.org/examples/camdither/ http://gamuza.d3cod3.org/examples/camdither/#comments Wed, 19 Sep 2012 09:36:53 +0000 n3m3da http://gamuza.d3cod3.org/?p=2118

This shows how to filter the camera image with ofx.dither() class.

Original addon from julapy https://github.com/julapy/ofxDither

/*
   
 GAmuza 0.4.1 examples
 ---------------------
 Video/camDither.ga
 
 This shows how to filter the camera image with ofx.dither() class.
 
 created by n3m3da | www.d3cod3.org
 
*/

dither = ofx.dither()
_type = 1
cam = of.texture()
pixels = of.pixels()
imageIn = of.image()
imageOut = of.image()

function setup()
        cam:allocate(CAPTURE_W,CAPTURE_H,GL_RGB)
        imageIn:allocate(CAPTURE_W,CAPTURE_H,OF_IMAGE_GRAYSCALE)
        imageOut:allocate(CAPTURE_W,CAPTURE_H,OF_IMAGE_GRAYSCALE)    
end

function update()
        // get the cam texture
        cam = ga.cameraTexture(0)
        // get the cam pixels
        cam:readToPixels(pixels)
        imageIn:setFromPixels(pixels)
       
        applyDither()
end

function draw()
        ga.background(0.0,1.0)

        of.setColor(255)    
        imageOut:draw(0,0,OUTPUT_W,OUTPUT_H)
end

function keyReleased()
        if ga.key() == string.byte('0') then
                _type = 0
        elseif ga.key() == string.byte('1') then
                _type = 1
        elseif ga.key() == string.byte('2') then
                _type = 2
        end
end

/////////////////////////////////////////
// Custom functions

// the ofx.dither class has three different alghorithms you can use
function applyDither()
        if _type == 0 then
        dither:ordered(imageIn,imageOut)
    elseif _type == 1 then
        dither:floyd_steinberg(imageIn,imageOut)
    elseif _type == 2 then
        dither:atkinson(imageIn,imageOut)
    end
end

]]> http://gamuza.d3cod3.org/examples/camdither/feed/ 0