# Processing 3.5.3 - G4P library - print variable to 2nd window
**URL:** https://discourse.processing.org/t/processing-3-5-3-g4p-library-print-variable-to-2nd-window/17968
**Category:** Libraries
**Created:** [February 21, 2020, 8:05am UTC](https://discourse.processing.org/t/processing-3-5-3-g4p-library-print-variable-to-2nd-window/17968 "2020-02-21T08:05:07Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Theo68](https://discourse.processing.org/u/Theo68)
#### Post date: [February 21, 2020, 8:05am UTC](https://discourse.processing.org/t/processing-3-5-3-g4p-library-print-variable-to-2nd-window/17968/1 "2020-02-21T08:05:07Z")
I’m using the g4p\_controls library. Pressing a button opens a second window. In the 2nd window I have placed some labels that correspond to the values of a sensor. I’m trying to display the sensor value next to the label. How can I display the value of a variable in this 2nd window ?? is there any example of displaying the variable at any point on the 2nd window surface ???
```auto
public void button1_click1(GButton source, GEvent event) { //_CODE_:button1:896367:
window1 = GWindow.getWindow(this, "Window title", 0, 0, 240, 120, JAVA2D);
window1.noLoop();
window1.setActionOnClose(G4P.CLOSE);
window1.addDrawHandler(this, "win_draw1");
**// In this point i want to print to the 2nd window the float variable from the sensor**
label1 = new GLabel(window1, 9, 14, 80, 20);
label1.setTextAlign(GAlign.CENTER, GAlign.MIDDLE);
label1.setText("Humidity");
label1.setOpaque(false);
window1.loop();
} //_CODE_:button1:896367:
synchronized public void win_draw1(PApplet appc, GWinData data) { //_CODE_:window1:810925:
appc.background(230);
} //_CODE_:window1:810925:
public void createGUI(){
G4P.messagesEnabled(false);
G4P.setGlobalColorScheme(GCScheme.BLUE_SCHEME);
G4P.setMouseOverEnabled(false);
surface.setTitle("Sketch Window");
button1 = new GButton(this, 14, 16, 120, 30);
button1.setText("open window");
button1.addEventHandler(this, "button1_click1");
}
GButton button1;
GWindow window1;
GLabel label1;
```
---
### Author:  [@quark](https://discourse.processing.org/u/quark)
#### Post date: [February 21, 2020, 8:42am UTC](https://discourse.processing.org/t/processing-3-5-3-g4p-library-print-variable-to-2nd-window/17968/2 "2020-02-21T08:42:24Z")
Use a label on the second window for the value e.g. `labal.setText("" + value)`
---
### Author:  [@Theo68](https://discourse.processing.org/u/Theo68)
#### Post date: [February 21, 2020, 11:24am UTC](https://discourse.processing.org/t/processing-3-5-3-g4p-library-print-variable-to-2nd-window/17968/4 "2020-02-21T11:24:16Z")
I managed to do what you suggested and it was a success.
Plus I managed to change the fonts and size. What I failed to do is change the color.
But the main problem is that I must find a way to keep the Labeltext up to date like the variable do . It seems difficult for the level of knowledge I have. Maybe I need to change the whole design and logic.
Thank you for your help
---
### Author:  [@quark](https://discourse.processing.org/u/quark)
#### Post date: [February 21, 2020, 2:45pm UTC](https://discourse.processing.org/t/processing-3-5-3-g4p-library-print-variable-to-2nd-window/17968/5 "2020-02-21T14:45:33Z")
> [@Theo68](#):
>
> keep the Labeltext up to date like the variable do
try this sketch out, the label text is constantly update as the mouse moves
```auto
import g4p_controls.*;
GLabel lbl0;
float dist; // distance from the centre of window
void setup(){
size(500,300);
lbl0 = new GLabel(this, 50,20,100,20,"?");
lbl0.setOpaque(true);
}
void draw(){
background(200,200,255);
lbl0.setText("" + dist);
// DRaw lines showing window centre
stroke(20,20,128);
line(0, height/2, width, height/2);
line(width/2, 0, width/2, height);
}
// This Processing method is executed everytime
// the mouse moves.
void mouseMoved(){
// Calculate the distance of the mouse from the centre of the window
float dx = mouseX - width/2;
float dy = mouseY - height/2;
dist = sqrt(dx*dx+dy*dy);
}
```
> [@Theo68](#):
>
> What I failed to do is change the color.
Look at the G4P [guides](http://www.lagers.org.uk/g4p/guides/g01-introduction.html) on my website. See the guides under colour schemes. 😄
---
### Author:  [@Theo68](https://discourse.processing.org/u/Theo68)
#### Post date: [February 21, 2020, 5:47pm UTC](https://discourse.processing.org/t/processing-3-5-3-g4p-library-print-variable-to-2nd-window/17968/6 "2020-02-21T17:47:24Z")
First of all thank you very much for your help. I have managed to solve the main problem of constantly updating the variable within the form by studying many examples and using my intuition.
I used this routine and it works great for all texts in labels that appear in the 2nd window.
```auto
synchronized public void windowDraw1 (PApplet appc, GWinData data) {
appc.background (230);
AirTemp_sensor1_Data.setText ("" + millis () / 1000);
AirHum_sensor1_Data.setText ("" + millis () / 500);
SoilTemp_sensor1_Data.setText ("" + millis () / 250);
SoilHum_sensor1_Data.setText ("" + millis () / 125);
Sun_sensor1_Data.setText ("" + millis () / 10);
UVA_sensor1_Data.setText ("" + millis () / 5);
UVB_sensor1_Data.setText ("" + millis ());
}
```
I started with the GUI gap builder but have made some modifications to the original code given by the gap builder. So from this point on, and then I try to embed code without opening the gap builder so that always generate the original code. Thanks again. 🙂
Στις Παρ, 21 Φεβ 2020 στις 4:55 μ.μ., ο/η Peter Lager via Processing Foundation [processingfoundation1@discoursemail.com](mailto:processingfoundation1@discoursemail.com) έγραψε: