Fora

I am pretty stumped in trying to figure out the best way to change or invert the colour of text only when it touches 

a section of the screen (A rectangle using sketch)

To illustrate this, I have knocked up a patch which is a simple scroller and a rectangle box which is placed in the middle section of pwindow.

My jitter skills are inadequate so apologies in advance! (I am trying to learn tho!)

loadbang

message

number

toggle

counter

metro

scale

flonum

jit.pwindow

jit.gl.sketch

button

jit.fpsgui

jit.gl.render

qmetro

jit.gl.text2d

pack

zl.queue

zl.len

atoi

coll

jit.matrix

I am pretty stumped in trying to figure out the best way to change or invert the colour of text only when it touches 
a section of the screen (A rectangle using sketch)

Hello my fellow Jitterinos!
I am pretty stumped in trying to figure out the best way to change or invert the colour of text only when it tou

text2d-sketch-change-the-colour-of-text-when-crossing-a-section-of-the-screen

A simple way to do it, if you intend to use a stepped movement of the text with the counter object is just to select the numbers of the counter to trigger colour changes to the text object.

Or it you need more precision, you could use the jit.gl.text3d instead and use the getbounds message to it along with getattr object for position and build the colour changing logic based on that.

A simple way to do it, if you intend to use a stepped movement of the text with the counter object is just to select the numbers of the counter to trigger colour changes to the text object.  

Or it you need more precision, you could use the jit.gl.text3d instead and use the getbounds message to it along with getattr object for position and build the colour changing logic based on that. 

I did try something to that extent originally but I'm trying to change only one line of text at a time not all of the text colour, basically when one of the lines touch the rectangle section in the middle, it turns white (or any arbitrary colour). The patch you provided changes all of the text colour.

Wondering if there any jitter objects which I could use to affect only a partial section of the screen?

I did try something to that extent originally but I'm trying to change only one line of text at a time not all of the text colour, basically when one of the lines touch the rectangle section in the middle, it turns white (or any arbitrary colour).  The patch you provided changes all of the text colour. 

Wondering if there any  jitter objects which I could use to affect only a partial section of the screen?

Originally I had two layers of 2dtext objects, one was static over the top and appeared when needed, but that felt more of a hack than a good solution, I'm working on the GUI for a music app just to give you some context :)

one thing you could try is having the sketch object on layer 2 with blend enabled and mess around with the different blend modes.

Or make individual text objects per line and address the colour changes logic for them individually.

one thing you could try is having the sketch object on layer 2 with blend enabled and mess around with the different blend modes. 

Or make individual text objects per line and address the colour changes logic for them individually. 

Awesome, yes @blend_mode 4 0 did the trick!

Text2D & Sketch (change the colour of text when crossing a section of the screen?)