Unable to adjust the parameters of a gloabal variable later in the code

Programming Questions

newtoproc..

Unable to adjust the parameters of a gloabal variable later in the code

in Programming Questions • 2 years ago

I have included a simplified version of the code I am currently struggling with...in short - I have defined several gloabl variables which I am using in my class. However, I tried but could not adjust the parameters of these variable anywhere later in the code..

float x1,y1,z1 = 0;

float x2,y2 = 100

float z2 = - 100;

void setup() {

point1 = newPointS (0,0,0);

println(y1 = y1 + 10);//It does print the result

if (mousePressed) {

y1 = y1 + 10;// No change happens on the sketch

}

void draw() {

point1.drawPoint();

}

class PointS {

float x1,y1,z1

PointS (float, xpos,ypos,zpos) {

x1 = xpos;

y1 = ypos;

z1 = zpos;

void drawPoint() {

strokeWeight(2);

point(x1,y1,z1);

}

Replies(5)

luis2048

Re: Unable to adjust the parameters of a gloabal variable later in the code

2 years ago

I think you want static variables.

http://processing.org/reference/static.html

you can access the class variable more directly like so:

PointS point1;
void setup() {
size(500,500,P3D);
point1 = new PointS (10,10,0);
}
void mousePressed(){
point1.y1 += 10;
println(point1.y1);
}
void draw() {
point1.drawPoint();
}
class PointS {
int x1,y1,z1;
PointS (int xpos, int ypos, int zpos) {
x1 = xpos;
y1 = ypos;
z1 = zpos;
}
void drawPoint() {
strokeWeight(2);
point(x1,y1,z1);
}
}

newtoproc..

Re: Re: Unable to adjust the parameters of a gloabal variable later in the code

2 years ago

Hi Luis and thank you for your response!

I did try accessing the variable with the dot operator and changing its value but it did not work.

As for the static option, I actually want my variables to be not only class variables..that is why I declared them outside

and I do not want all instances of the Class PointS to share the same variable

But if I change y1 from point1 = new PointS (10, 10, 0); I see the result!

May be the problem is that I am declaring the variable at two places - first as a gloabal = to a numner

and then as a class = to a temperory variable

But I need it as a global variable so that I can access it from everywhere

gordoncsa

Re: Unable to adjust the parameters of a gloabal variable later in the code

2 years ago

I'm a bit confused about what you're trying to do. Are the global variables x1,y1 etc. only used when you create the point1 object, or are you trying to use them during the draw loop as well?

newtoproc..

Re: Re: Unable to adjust the parameters of a gloabal variable later in the code

2 years ago

I am trying to use them during the draw loop

I basically want to change their parameters

And when I actually write in setup()

point1.x1 = point1.x1+15;

this does not change the parameter of x1, but rather creates a new point with the new x parameter, and the same y and z parameters

In another case (point6.x6 = point6.x6+15), it does nothing - neither creates another point nor changes the parameter of the specified variable

newtoproc..

Re: Unable to adjust the parameters of a gloabal variable later in the code

2 years ago

I figured it out!

float x1,y1,z1 = 0;

float x2,y2 = 100

float z2 = - 100;

void setup() {

point1 = newPointS (0,0,0);

println(y1 = y1 + 10);//It does print the result

if (mousePressed) {

y1 = y1 + 10;

}

void draw() {

point1.drawPoint();

}

class PointS {

float x,y,z // versus float x1,y1,z1;

PointS (float, xpos,ypos,zpos) {

x = xpos; //versus x1 = xpos

y = ypos; //versus y1 = ypos

z = zpos; //versus z1 = zpos

void drawPoint() {

strokeWeight(2);

point(x,y,z); // versus point(x1,y1,z1);

}

Thanks for your responses and engagement with my question!

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