color text

gistfile1.txt

function setup()
    t={"This is some ","fancily colored ","text message thingy,","which is a ","mixture ","of ","several totally different ","colors, for your delectation",}
    c={color(0),color(255,0,0),color(0,0,255),color(0),color(255,255,0),color(255),
        color(255, 0, 0, 255),color(0)}
    p=WriteText(t,c,300,300,18)
end

function draw()
    background(150)
    sprite(p,500,500)
end

--t = table of text, c = table of colors, w,h=wrap width,text height, s=font size
function WriteText(t,c,w,h,s)
    textMode(CORNER)
    fontSize(s)
    textWrapWidth(w)
    textAlign(LEFT)
    
    local tt={}
    tt[1]=t[1]
    for i=2,#t do tt[i]=tt[i-1]..t[i] end
    
    local img0=image(w,h)
    for i=1,#t do
        local img1=image(w,h)
        setContext(img1)
        local ww,hh=textSize(tt[i])
        fill(c[i])
        text(tt[i],0,200-hh)
        setContext()
        local m=mesh()
        m:addRect(w/2,h/2,w,h)
        m.shader=shader(textShader.vertexShader,textShader.fragmentShader)
        m.texture=img0
        m.shader.texture2=img1
        local img2=image(w,h)
        setContext(img2)
        m:draw()
        setContext()
        img0=img2
    end 
    return img0 
end

textShader = {
vertexShader = [[

uniform mat4 modelViewProjection;

attribute vec4 position;
attribute vec4 color;
attribute vec2 texCoord;
varying lowp vec4 vColor;
varying highp vec2 vTexCoord;

void main()
{
    vColor = color;
    vTexCoord = texCoord;
    gl_Position = modelViewProjection * position;
}

]],
fragmentShader = [[

precision highp float;
uniform lowp sampler2D texture;
uniform lowp sampler2D texture2;
varying lowp vec4 vColor;
varying highp vec2 vTexCoord;

float z=0.1;

void main()
{
    lowp vec4 c1 = texture2D(texture, vTexCoord) ;
    lowp vec4 c2 = texture2D(texture2, vTexCoord) ;
    if (c1.a==0. && c2.a>0.) gl_FragColor=c2;
    else gl_FragColor=c1;
}

]]}