[ControlP5] Try to change position of ''CaptionLabel'' of an array of "Groups" and get NullPointerException!

e_paga

[ControlP5] Try to change position of ''CaptionLabel'' of an array of "Groups" and get NullPointerException!

in Contributed Library Questions • 4 months ago

HI friends, im very stuck in a project i am doing. I have a several problem when i want to change the styles of the labels of a array of groups. I have 4 Groups, and i want to change his label to be center, i was thinking about a for cicle to change all in one..but i have some troubles.

So i have a defined simple groups..

controlP5.Group g1; // Seteo de Temperatura
controlP5.Group g2; // '' de Humedad
controlP5.Group g3; // '' de Dioxido de carbono
controlP5.Group g4;

Inside the void setup(), i have:

g1 = cp5.addGroup("Seteo de Temperatura")
.setPosition( c1 , f1 )
.setBackgroundColor(color(255,80))
.setBackgroundHeight(g_h)
.setWidth(g_w)
.setBarHeight(w_barra);
g2 = cp5.addGroup("Seteo de Humedad")
.setPosition( c2 , f1 )
.setBackgroundColor(color(255,80))
.setBackgroundHeight(g_h)
.setWidth(g_w)
.setBarHeight(w_barra);
g3 = cp5.addGroup("Seteo de Dioxido de Carbono")
.setPosition( c1 , f2 )
.setBackgroundColor(color(255,80))
.setBackgroundHeight(g_h)
.setWidth(g_w)
.setBarHeight(w_barra);
g4 = cp5.addGroup("Seteo de Luminosidad")
.setPosition( c2 , f2 )
.setBackgroundColor(color(255,80))
.setBackgroundHeight(g_h)
.setWidth(g_w)
.setBarHeight(w_barra);

Then i make the array with the groups and try to change the position of label...

controlP5.Group[] g_array = {g1,g2,g3,g4};
for(i=0;i<4;i++){
g_array[i].captionLabel();
g_array[i].captionLabel().getStyle().marginLeft = 40;
g_array[i].captionLabel().getStyle().marginTop = 10;
}

I have the error in line 3., when i try to catch the label of the group.

Someone can help me??

thanks in advance!! so noob with Processing..

Replies(3)

PhiLho

Re: [ControlP5] Try to change position of ''CaptionLabel'' of an array of "Groups" and get NullPointerException!

4 months ago

I don't see an obvious error.
Try, before the loop, to add the line:
println(g_array);
to see what the array looks like. Is there a null inside?

andreas.s..

Re: [ControlP5] Try to change position of ''CaptionLabel'' of an array of "Groups" and get NullPointerException!

4 months ago

is i inside your for loop defined somewhere? if not this will do

for(int i=0;i<4;i++){

since all 4 groups are following the same pattern, you could use a function that builds and returns a group.

import controlP5.*;
controlP5.Group g1;
controlP5.Group g2;
controlP5.Group g3;
controlP5.Group g4;
ControlP5 cp5;
void setup() {
size(400,400);
cp5 = new ControlP5( this );
int c1 = 100;
int f1 = 100;
int g_w = 200;
int g_h = 100;
int w_barra = 20;
g1 = makeGroup( "Seteo de Temperatura" , c1 , f1 , g_w, g_h, w_barra );
g2 = makeGroup( "Seteo de Humedad" , c1 , f1 , g_w, g_h, w_barra );
g3 = makeGroup( "Seteo de Dioxido de Carbono" , c1 , f1 , g_w, g_h, w_barra );
g4 = makeGroup( "Seteo de Luminosidad" , c1 , f1 , g_w, g_h, w_barra );
}
void draw() {}
Group makeGroup(String theName, int theX, int theY, int theWidth , int theHeight , int theBarWidth) {
Group group = cp5.addGroup( theName)
.setPosition( theX , theY )
.setBackgroundColor(color(255,80))
.setBackgroundHeight(theHeight)
.setWidth(theWidth)
.setBarHeight(theBarWidth);
group.getCaptionLabel().getStyle().marginLeft = 40;
group.getCaptionLabel().getStyle().marginTop = 10;
return group;
}

andreas schlegel, http://www.sojamo.de

e_paga

Re: [ControlP5] Try to change position of ''CaptionLabel'' of an array of "Groups" and get NullPointerException!

4 months ago

@ PhiLho I try it, and it seems good. I really dont understand the problem. Is not null.

@ andreas I have defined the i in the begining. Is really a good solution!!!. If i cant get it solve, i will consider your solution. Really thank you!!

Now i have some doubts..and..

I was wondering, is there any problem in the declaration of the array??

I have to use maybe something with new function to asignate memory??

Sorry in advance for my silly questions!

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